Source: https://www.scribd.com/document/196963748/1016
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1016 | Air Conditioning | Thermostat
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Service Literature KCA180 through 300S
KCA180, 210, 240 and 300 units are available in 176,000 to 270,000 Btuh (51.7 to 79.1kW) standard efficiency cooling capacities. The 180 utilizes two compressors, while the 210, 240 and 300 utilize three compressors. Optional electric heat is fieldinstalled. Electric heat operates in single or multiple stages depending on the kW input size. 15kW to 60kW heat sections are available for 180 units and 15kW to 90kW heat sections are available for the 210, 240 and 300. All units are designed to accept any of several different energy management thermostat control systems with minimum field wiring. Information contained in this manual is intended for use by qualified service technicians only. All specifications are subject to change. Procedures outlined in this manual are presented as a recommendation only and do not supersede or replace local or state codes. If the unit must be lifted for service, rig unit by attaching four cables to the holes located in the unit base rail (two holes at each corner). Refer to the installation instructions for the proper rigging technique. ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures
15, 17.5, 20, 25 ton 53, 62, 70, 88 kW
240/300 SHOWN
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs and HCFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.
Options / Accessories . . . . . . . . . . . . . . . Page 2 Specifications . . . . . . . . . . . . . . . . . . . . . . Page 5 Blower Data . . . . . . . . . . . . . . . . . . . . . . . Page 6 Electrical / Electric Heat Data . . . . . . . . Page 9 Electric Heat Capacities . . . . . . . . . . . . . Page 13 Parts Arrangement . . . . . . . . . . . . . . . . . Page 15 I Unit Components . . . . . . . . . . . . . . . . . . Control Box . . . . . . . . . . . . . . . . . . . . . Cooling . . . . . . . . . . . . . . . . . . . . . . . . Blower Compartment . . . . . . . . . . . . . . Electric Heat . . . . . . . . . . . . . . . . . . . . Page 16 Page 16 Page 21 Page 22 Page 24
Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the units electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface, such as the gas valve or blower deck, before performing any service procedure.
II Placement and Installation . . . . . . . . . Page 27 III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . Page 27 IV Charging . . . . . . . . . . . . . . . . . . . . . . . Page 28
Danger of sharp metallic edges. Can cause injury. Take care when servicing unit to avoid accidental contact with sharp edges.
V System Service Checks
. . . . . . . . Page 29
VI Maintenance . . . . . . . . . . . . . . . . . . . . Page 29 VII Accessories . . . . . . . . . . . . . . . . . . . . Page 30 VIII Diagrams . . . . . . . . . . . . . . . . . . . . . . Page 36 Page 1
2010 Lennox Industries Inc.
Item Description COOLING SYSTEM Condensate Drain Trap Corrosion Protection Drain Pan Overflow Switch Efficiency Low Ambient Kit Refrigerant Type BLOWER - SUPPLY AIR Motors Model Number PVC - LTACDKP09/36 Copper - LTACDKC09/36 K1SNSR71C-1K1SNSR33C-1 Catalog Number 76M18 76M19 Factory 68W89 Standard 55W72 R-410A Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory 54W79 54W80 54W83 54W84 --53W82 53W83 180 X X O X O X O O O O O O O O O O O O 210 X X O X O X O O O O O O O O O O O O 240 X X O X O X O 300 X X O X O X O
Drive Kits See Blower Data Tables for usage and selection
CABINET Coil Guards Hail Guards
Belt Drive - 3 hp Belt Drive - 5 hp Belt Drive - 7.5 hp Belt Drive - 10 hp Kit #1 535-725 rpm Kit #2 710-965 rpm Kit #3 685-856 rpm Kit #4 850-1045 rpm Kit #5 945-1185 rpm Kit #6 850-1045 rpm Kit #7 945-1185 rpm Kit #8 1045-1285 rpm Kit #10 1045-1285 rpm Kit #11 1135-1365 rpm C1GARD20C11 C1GARD20C31 C1GARD10C11 C1GARD10C31
CONTROLS Commercial Controls L Connection Building Automation System Smoke Detector - Supply or Return (Power board and one sensor) C1SNSR44C-1 Smoke Detector - Supply and Return (Power board and two sensors) C1SNSR43C-1 INDOOR AIR QUALITY Air Filters MERV 8 - C1FLTR15C-1Healthy Climate High Efficiency Air Filters 24 x 24 x 2 (Order 6 per unit) MERV 13 - C1FLTR40C-1Replacement Media Filter With Metal Mesh C1FLTR30C-1Frame (includes non-pleated filter media) Indoor Air Quality (CO2) Sensors Sensor - Wall-mount, off-white plastic cover with LCD display C0SNSR50AE1L Sensor - Wall-mount, off-white plastic cover, no display C0SNSR52AE1L Sensor - Black plastic case with LCD display, rated for plenum mounting C0SNSR51AE1L Sensor - Wall-mount, black plastic case, no display, rated for C0MISC19AE1 plenum mounting C0MISC19AE1CO2 Sensor Duct Mounting Kit - for downflow applications C0MISC16AE1Aspiration Box - for duct mounting non-plenum rated CO2 sensors (87N53 or 77N39) UVC Germicidal Light Kit 1 Healthy Climate UVC Light Kit (110/230v-1ph) C1UVCL10C-1
54W67 52W40 44N61
77N39 87N53 87N52 87N54 85L43 90N43
54W65
Lamps operate on 110-230V single-phase power supply. Step-down transformer must be field supplied for field installation in 460V and 575V rooftop units (transformer is furnished for factory installed light kits). Alternately, a separate 110V power supply may be used to directly power the UVC ballast(s) NOTE - Catalog and model numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
Item Description ELECTRICAL Voltage 60 hz 208/230V - 3 phase 460V - 3 phase 575V - 3 phase Disconnect Switch (see Electric Heat Tables for usage, ) 80 amp - C1DISC080C-1 150 amp - C1DISC150C-1 250 amp - C1DISC250C-1 GFI Service Outlets ELECTRIC HEAT 15 kW 208/230V-3ph - C1EH0150C-1Y 460V-3ph - C1EH0150C-1G 575V-3ph - C1EH0150C-1J 30 kW 208/230V-3ph - C1EH0300C21Y 460V-3ph - C1EH0300C21G 575V-3ph - C1EH0300C21J 45 kW 208/230V-3ph - C1EH0450C21Y 460V-3ph - C1EH0450C21G 575V-3ph - C1EH0450C21J 60 kW 208/230V-3ph - C1EH0600C21Y 460V-3ph - C1EH0600C21G 575V-3ph - C1EH0600C21J 90 kW 208/230V-3ph - C1EH0900C-1Y 460V-3ph - C1EH0900C-1G 575V-3ph - C1EH0900C-1J ECONOMIZER Economizer Economizer - Downflow or Horizontal (Outdoor Air Hood furnished) Economizer Controls Differential Enthalpy Single Enthalpy Downflow Barometric Relief Dampers Barometric Relief Dampers with Exhaust Hood Horizontal Barometric Relief Dampers Barometric Relief Dampers with ExhaustHood
NOTE - Catalog and model numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
Catalog Number Factory Factory Factory 54W85 54W86 54W87 74M70 53W84 53W86 53W87 53W92 53W94 53W95 54W00 54W02 54W03 54W08 54W10 54W11 54W12 54W14 54W15
O O O OX OX OX OX X X X X X X X X X X X X
O O O OX OX OX OX X X X X X X X X X X X X X X X
Field wired - LTAGFIK10/15
K1ECON20C-1
Order 2 - C1SNSR64FF1 C1SNSR64FF1 C1DAMP50C LAGEDH18/24
53W64 53W64 54W78 16K99
X OX OX X
Item Description OUTDOOR AIR Outdoor Air Dampers Motorized Dampers with Outdoor Air Hood Manual Dampers With Outdoor Air Hood POWER EXHAUST Standard Static Model Number Catalog Number 180 210 240 300
K1DAMP20C-1 C1DAMP10C-1 208/230V - C1PWRE10C-1Y 460V - C1PWRE10C-1G 575V - C1PWRE10C-1J
58W62 54W76 54W70 54W71 54W72
OX OX X X X
ROOF CURBS - DOWNFLOW Clip Curb 8 in. height C1CURB40CD1 14 in. height LARMF18/30S-14 18 in. height LARMF18/30S-18 24 in. height LARMF18/30S-24 Standard 14 in. height LARMF18/36-14 24 in. height LARMF18/36-24 Adjustable Pitched Curb 14 in. height L1CURB55C ROOF CURBS - HORIZONTAL (REQUIRES HORIZONTAL RETURN AIR PANEL Standard 26 in. height - slab applications LARMFH18/24-26 37 in. height - rooftop applications LARMFH18/24-37 30 in. height - slab applications LARMFH30/36-30 41 in. height - rooftop applications LARMFH30/36-41 Insulation Kit For Standard Horizontal Curbs for LARMFH18/24-26 C1INSU11C-1for LARMFH18/24-37 C1INSU13C-1for LARMFH30/36-30 C1INSU12C-1for LARMFH30/36-41 C1INSU14C-1Horizontal Return Air Panel Kit Required for Horizontal Applications with Roof Curb C1HRAP10C-1CEILING DIFFUSERS Step-Down - Order one RTD11-185 RTD11-275-R RTD11-150/180S (Canada only) RTD11-275S (Canada only) Flush - Order one FD11-185 FD11-275-R FD11-150/180S (Canada only) FD11-275S (Canada only) Transitions (Supply and Return) - Order one LASRT18 LASRT21/24 LASRT18S (Canada only) LASRT21/24S (Canada only)
26W32 33K44 33K45 33K46 16K87 16K88 43W26 KIT) 97J33 38K53 33K79 38K54 73K32 73K34 73K33 73K35 87M00 29G06 29G07 13K63 13K64 29G10 29G11 13K58 13K59 19K01 19K02 33K48 33K49
General Data Nominal Tonnage Model Number Efficiency Type Blower Type 20 Ton 25 Ton KCA240S4B KCA300S4B Standard Standard Constant Air Constant Air Volume CAV Volume CAV 238,000 282,000 228,000 270,000 7700 8750 20.8 26.9 11.0 10.0 11.2 10.1 R-410A R-410A 14 lbs. 0 oz. 14 lbs. 8 oz. 14 lbs. 0 oz. 14 lbs. 8 oz. 14 lbs. 0 oz. 14 lbs. 8 oz. 15-30-45-60-90 kW Scroll (3) Scroll (3) Scroll (3) 41.40 55.20 55.20 3/8 3/8 3/8 2 2 2 20 20 20 (3) 1/3 (4) 1/3 (4) 1/3 1075 1075 1075 1500 1100 1500 (3) 24 (4) 24 (4) 24 3 3 3 12,000 16,000 16,000 21.40 21.40 21.40 3/8 3/8 3/8 3 4 4 14 14 14 (1) 1 in. FPT (1) 1 in. FPT (1) 1 in. FPT Balance port TXV, removable head 3 hp, 5 hp, 7.5 hp 3 hp, 5 hp, 7.5 hp 5 hp, 7.5 hp, 10 hp 5 hp, 7.5 hp, 10 hp 3.45 hp, 5.75 hp, 3.45 hp, 5.75 hp, 5.75 hp, 8.62 hp, 5.75 hp, 8.62 hp, 8.62 hp 8.62 hp 11.5 hp 11.5 hp 5 hp 3 hp Kit 1 535-725 rpm Kit 3 685-856 rpm Kit 2 710-965 rpm Kit 4 850-1045 rpm Kit 5 945-1185 rpm 5 hp Kit 3 685-856 rpm 7.5 hp Kit 4 850-1045 rpm Kit 6 850-1045 rpm Kit 5 945-1185 rpm Kit 7 945-1185 rpm 7.5 hp Kit 8 1045-1285 rpm 10 hp Kit 6 850-1045 rpm Kit 7 945-1185 rpm Kit 7 945-1185 rpm Kit 10 1045-1285 rpm Kit 8 1045-1285 rpm Kit 11 1135-1365 rpm (2) 15 x 15 (2) 15 x 15 (2) 15 x 15 (2) 15 x 15 Fiberglass, disposable (6) 24 x 24 x 2 208/230V, 460V or 575V - 60 hertz - 3 phase 15 Ton KCA180S4B Standard Constant Air Volume CAV 182,000 176,000 6000 16.0 11.0 11.2 R-410A 14 lbs. 0 oz. 14 lbs. 0 oz. N/A 15-30-45-60 kW Scroll (2) 41.40 3/8 2 20 (3) 1/3 1075 1100 (3) 24 3 12,000 18.60 3/8 3 14 (1) 1 in. FPT 17.5 Ton KCA210S4B Standard Constant Air Volume CAV 204,000 198,000 6125 18.0 11.0 11.2 R-410A 10 lbs. 8 oz. 10 lbs. 8 oz. 10 lbs. 8 oz.
Cooling Gross Cooling Capacity - Btuh Performance 1 Net Cooling Capacity - Btuh AHRI Rated Air Flow - cfm Total Unit Power - kW 1 EER (Btuh/Watt) 2 IEER (Btuh/Watt) Refrigerant Type Refrigerant Circuit 1 Charge Circuit 2 Furnished Circuit 3 Electric Heat Available, see page 3 Compressor Type (number) Outdoor Net face area (total) - sq. ft. Coils Tube diameter - in. Number of rows Fins per inch Outdoor Coil Motor - (No.) horsepower Fans Motor rpm Total Motor watts Diameter - (No.) in. Number of blades Total Air volume - cfm Indoor Coils Net face area (total) - sq. ft. Tube diameter - in. Number of rows Fins per inch Drain connection - No. and size Expansion device type 3 Indoor Nominal motor output Blower Maximum usable motor and output (US Only) Drive Motor - Drive kit number Selection
Blower wheel nominal diameter x width - in. Filters Type of filter Number and size - in. Electrical characteristics
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction. 1 Certified in accordance with the ULE certification program, which is based on AHRI Standard 340/360; 95F outdoor air temperature and 80F db/67F wb entering evaporator air; minimum external duct static pressure. 2 Integrated Energy Efficiency Ratio certified and tested according to AHRI Standard 340/360. 3 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL & AIR FILTERS IN PLACE FOR ALL UNITS ADD: 1 - Wet indoor coil air resistance of selected unit. 2 - Any factory installed options air resistance (heat section, economizer, etc.) 3 - Any field installed accessories air resistance (duct resistance, diffuser, etc.) Then determine from blower table blower motor output and drive required. See page 7 for wet coil and option/accessory air resistance data. See page 7 for factory installed drive kit specifications. MINIMUM AIR VOLUME REQUIRED FOR USE WITH OPTIONAL ELECTRIC HEAT All units require 6000 cfm minimum air with electric heat.
Air Volume cfm 4750 5000 5250 5500 5750 6000 6250 6500 6750 7000 7250 7500 7750 8000 8250 8500 8750 9000 9250 9500 9750 10,000 10,250 10,500 10,750 11,000 TOTAL STATIC PRESSURE - In. w.g. 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 575 1.10 660 1.45 740 1.80 810 2.15 870 2.50 930 2.85 985 3.20 1040 3.55 1085 3.90 1135 4.25 1180 4.65 1225 5.00 585 1.25 670 1.60 750 1.95 815 2.30 880 2.70 940 3.05 995 3.40 1045 3.80 1095 4.15 1140 4.50 1185 4.90 1230 5.30 595 1.35 680 1.70 755 2.10 825 2.50 890 2.90 945 3.25 1000 3.65 1050 4.00 1100 4.40 1150 4.80 1195 5.20 1235 5.60 605 1.45 690 1.85 765 2.25 835 2.65 895 3.05 955 3.45 1010 3.85 1060 4.25 1110 4.70 1155 5.10 1200 5.50 1240 5.90 615 1.60 700 2.00 775 2.45 840 2.85 905 3.25 960 3.65 1015 4.10 1065 4.50 1115 4.95 1160 5.35 1205 5.80 1250 6.25 630 1.75 710 2.15 785 2.60 850 3.05 910 3.45 970 3.90 1025 4.35 1075 4.80 1120 5.20 1170 5.65 1215 6.10 1255 6.55 640 1.90 720 2.35 795 2.80 860 3.25 920 3.70 975 4.15 1030 4.60 1080 5.05 1130 5.50 1175 5.95 1220 6.45 1265 6.90 650 2.05 730 2.50 805 3.00 870 3.45 930 3.95 985 4.40 1040 4.85 1090 5.35 1140 5.85 1185 6.30 1225 6.75 1270 7.25 665 2.20 745 2.70 815 3.20 880 3.70 940 4.20 995 4.65 1045 5.10 1095 5.60 1145 6.10 1190 6.60 1235 7.10 1275 7.60 675 2.35 755 2.90 825 3.40 890 3.95 950 4.45 1005 4.95 1055 5.40 1105 5.95 1155 6.45 1200 6.95 1240 7.45 1285 8.00 690 2.60 765 3.10 835 3.65 900 4.15 955 4.65 1015 5.25 1065 5.75 1115 6.25 1160 6.75 1205 7.30 1250 7.85 1290 8.35 700 2.75 775 3.30 845 3.85 910 4.45 965 4.95 1020 5.50 1075 6.05 1125 6.60 1170 7.15 1215 7.65 1260 8.25 1300 8.75 715 3.00 790 3.55 855 4.10 920 4.70 975 5.25 1030 5.80 1080 6.35 1130 6.90 1180 7.50 1225 8.05 1265 8.60 1305 9.15 725 3.20 800 3.80 865 4.35 930 4.95 985 5.50 1040 6.10 1090 6.70 1140 7.25 1185 7.85 1230 8.40 1275 9.00 1315 9.60 740 3.40 810 4.00 880 4.65 940 5.25 995 5.85 1050 6.45 1100 7.05 1150 7.65 1195 8.25 1240 8.85 1280 9.40 1325 10.05 750 3.65 825 4.30 890 4.90 950 5.55 1005 6.15 1060 6.80 1110 7.40 1160 8.05 1205 8.65 1250 9.25 1290 9.85 1330 10.45 765 3.90 835 4.55 900 5.20 960 5.85 1015 6.45 1070 7.15 1120 7.75 1165 8.35 1215 9.05 1255 9.65 1300 10.30 1340 10.90 780 4.20 850 4.85 910 5.50 970 6.15 1025 6.80 1080 7.50 1130 8.15 1175 8.75 1220 9.40 1265 10.10 1310 10.80 1350 11.40 790 4.45 860 5.15 925 5.85 985 6.55 1040 7.20 1090 7.85 1140 8.55 1185 9.20 1230 9.85 1275 10.55 1315 11.20 - - 805 4.75 875 5.45 935 6.15 995 6.90 1050 7.60 1100 8.25 1150 8.95 1195 9.60 1240 10.30 1285 11.05 - - 820 5.05 885 5.75 950 6.55 1005 7.20 1060 7.95 1110 8.65 1160 9.40 1205 10.05 1250 10.80 1295 11.50 - - 835 5.40 900 6.15 960 6.85 1015 7.60 1070 8.35 1120 9.05 1170 9.80 1215 10.50 1260 11.25 - - 845 5.65 910 6.45 970 7.20 1030 8.00 1080 8.75 1135 9.55 1180 10.25 1225 11.00 - - 860 6.00 925 6.85 985 7.65 1040 8.40 1095 9.20 1145 10.00 1190 10.70 1235 11.45 - - 875 6.40 940 7.25 1000 8.05 1055 8.85 1105 9.65 1155 10.45 1200 11.20 - - 890 6.80 950 7.60 1010 8.45 1065 9.30 1115 10.05 1165 10.90 - - ---------------------------------------------------------------------------------------------
FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS
Nominal hp 3 3 5 5 5 7.5 7.5 7.5 10 10 10 Maximum hp 3.45 3.45 5.75 5.75 5.75 8.63 8.63 8.63 11.50 11.50 11.50 Drive Kit Number 1 2 3 4 5 6 7 8 7 10 11 RPM Range 535 - 725 710 - 965 685 - 856 850 - 1045 945 - 1185 850 - 1045 945 - 1185 1045 - 1285 945 - 1185 1045 - 1285 1135 - 1365
NOTE - Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE - in. w.g.
Air Volume cfm 4000 4250 4500 4750 5000 5250 5500 5750 6000 6250 6500 6750 7000 7250 7500 8000 8500 9000 9500 10,000 10,500 11,000 Wet Indoor Coil 180S .02 .02 .02 .02 .03 .03 .03 .03 .04 .04 .04 .05 .05 .06 .06 .07 .08 .09 .10 .11 .12 .14 210S .02 .02 .02 .02 .02 .02 .02 .03 .03 .03 .03 .04 .04 .04 .05 .05 .06 .07 .08 .08 .09 .11 240S 300S .04 .04 .05 .05 .05 .06 .07 .07 .08 .08 .09 .10 .10 .11 .12 .13 .15 .16 .18 .20 .22 .24 Electric Heat Economizer ----------------.01 .01 .01 .01 .01 .01 .01 .02 .02 .04 .05 .06 .09 .11 ------------------.01 .02 .03 .04 .05 .06 .09 .11 .14 .16 .19 .22 .25 Filters MERV 8 .04 .04 .04 .04 .05 .05 .05 .05 .05 .05 .05 .05 .06 .06 .06 .06 .06 .07 .07 .07 .07 .08 MERV 13 .06 .06 .07 .07 .07 .07 .07 .08 .08 .08 .08 .08 .08 .09 .09 .09 .09 .10 .10 .11 .11 .11 Horizontal Roof Curb 180S thru 240S .06 .07 .07 .08 .08 .09 .10 .11 .11 .12 .13 .14 .15 .16 .17 .19 .21 .24 .26 .29 .31 .34 300S ----.02 .03 .03 .04 .04 .05 .06 .07 .08 .08 .09 .10 .11 .13 .15 .17 .19 .21 .24 .27
CEILING DIFFUSER AIR RESISTANCE - in. w.g.
Air Volume cfm 5000 5200 5400 5600 5800 6000 6200 6400 6500 6600 6800 7000 7200 7400 7500 7600 8000 8500 9000 9500 10,000 10,500 11,000
Step-Down Diffuser RTD11-185 RTD11-275 1 Side/2 Ends All Ends & 1 Side/2 Ends All Ends & 2 Ends Open 2 Ends Open Open Sides Open Open Sides Open .51 .44 .39 ------.56 .48 .42 ------.61 .52 .45 ------.66 .56 .48 ------.71 .59 .51 ------.76 .63 .55 .36 .31 .27 .80 .68 .59 ------.86 .72 .63 ------------.42 .36 .31 .92 .77 .67 ------.99 .83 .72 ------1.03 .87 .76 .49 .41 .36 ------1.09 .92 .80 1.15 .97 .84 ------------.51 .46 .41 1.20 1.02 .88 ------------.59 .49 .43 ------.69 .58 .50 ------.79 .67 .58 ------.89 .75 .65 ------1.00 .84 .73 ------1.10 .92 .80 ------1.21 1.01 .88
Flush Diffuser FD11-185 .27 .30 .33 .36 .39 .42 .46 .50 --.54 .58 .62 .66 .70 --.74 --------------FD11-275 ----------.29 ----.34 ----.40 ----.45 --.50 .57 .66 .74 .81 .89 .96
CEILING DIFFUSER AIR THROW DATA
Model No. Air Volume cfm 5600 5800 6000 6200 6400 6600
Effective Throw Range - ft. RTD11-185 FD11-185 Step-Down Flush 39 - 49 28 - 37 42 - 51 29 - 38 44 - 54 40 - 50 45 - 55 42 - 51 46 - 55 43 - 52 47 - 56 45 - 56
Air Volume cfm 7200 7400 7600 7800 8000 8200 8400 8600 8800
1 Throw is the horizontal or vertical distance an airstream travels on leaving the outletor diffuser before the maximum velocity is reduced to 50 ft. per minute. Four sides open.
Effective Throw Range - ft. RTD11-275 FD11-275 Step-Down Flush 33 - 38 26 - 35 35 - 40 28 - 37 36 - 41 29 - 38 38 - 43 40 - 50 39 - 44 42 - 51 41 - 46 43 - 52 43 - 49 44 - 54 44 - 50 46 - 57 47 - 55 48 - 59
POWER EXHAUST FAN PERFORMANCE
Return Air System Static Pressure in. w.g. 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
Air Volume Exhausted cfm 8630 8210 7725 7110 6470 5790 5060 4300 3510 2690 1840
ELECTRICAL/ELECTRIC HEAT DATA
15 TON STANDARD EFFICIENCY Voltage - 60hz Compressor 1
KCA180S4 208/230V - 3 Ph 25 164 25 164 2.4 (7.2) 2.4 (4.8) 460V - 3 Ph 12.2 100 12.2 100 1.3 (3.9) 1.3 (2.6) 7.5 24.2 110 110 88 93 3 4.8 45 50 37 39 15 5 7.6 50 50 39 42 7.5 11 50 50 43 45 3 3.9 35 35 28 30 575V - 3 Ph 9 78 9 78 1 (3) 1 (2) 15 5 6.1 35 40 30 32 7.5 9 40 40 33 35
Compressor 2 Outdoor Fan Motors (3) Power Exhaust
Rated Load Amps Locked Rotor Amps Rated Load Amps Locked Rotor Amps Full Load Amps (total) Full Load Amps
(total) (2) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower Horsepower Full Load Amps Motor
3 10.6 90 100 75 79
15 5 16.7 100 100 81 85
Unit Only With (2) 0.33 HP Power Exhaust Unit Only With (2) 0.33 HP Power Exhaust
Protection Minimum Circuit Ampacity
ELECTRIC HEAT DATA Electric Heat Voltage 2 Maximum Overcurrent Protection
Unit+ Electric Heat
Unit+ Electric Heat and (2) 0.33 HP Power Exhaust Unit+ Electric Heat and (2) 0.33 HP Power Exhaust
15 kW 30 kW 45 kW 60 kW 15 kW 30 kW 45 kW 60 kW 15 kW 30 kW 45 kW 60 kW 15 kW 30 kW 45 kW 60 kW
208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V 90 90 100 100 110 110 45 50 50 35 35 40 100 110 100 125 110 125 60 60 60 45 45 50 150 150 150 175 150 175 80 80 90 60 70 70 150 175 150 175 175 175 80 90 90 70 70 70 75 75 81 81 88 88 37 39 43 28 30 33 92 104 100 112 109 121 52 55 59 41 44 48 131 149 139 157 148 166 74 78 82 60 62 66 139 158 146 166 156 175 79 82 86 63 66 69 100 100 100 100 110 110 50 50 50 35 40 40 100 110 110 125 125 150 60 60 70 45 50 50 150 175 150 175 175 175 80 90 90 70 70 70 150 175 175 175 175 200 90 90 90 70 70 80 79 98 137 145 79 110 155 164 85 106 145 152 85 118 163 172 93 115 154 162 93 127 172 181 39 55 77 82 42 58 81 85 45 63 85 90 30 44 62 66 32 47 65 68 35 50 68 72
ELECTRICAL ACCESSORIES Disconnect Unit Only Unit + Power Exhaust Unit + Electric Heat 15 kW Unit + Electric Heat 30 kW Unit + Electric Heat 45 kW Unit + Electric Heat 60 kW Unit + Power Exhaust + Elec. Heat 15 kW Unit + Power Exhaust + Elec. Heat 30 kW Unit + Power Exhaust + Elec. Heat 45 kW Unit + Power Exhaust + Elec. Heat 60 kW
54W85 54W85 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85
Extremes of operating range are plus and minus 10% of line voltage. HACR type breaker or fuse. 3 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
17.5 TON STANDARD EFFICIENCY 1 Voltage - 60hz Compressor 1 Rated Load Amps Locked Rotor Amps Compressor 2 Rated Load Amps Locked Rotor Amps Compressor 3 Rated Load Amps Locked Rotor Amps Outdoor Fan Full Load Amps (total) Motors (3) Power Exhaust (total) (2) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower Horsepower Full Load Amps Motor
208/230V - 3 Ph 19 123 19 123 19 123 2.4 (7.2) 2.4 (4.8) 460V - 3 Ph 9.7 62 9.7 62 9.7 62 1.3 (3.9) 1.3 (2.6) 7.5 24.2 110 110 95 100 3 4.8 45 50 41 43 15 5 7.6 50 50 44 46 7.5 11 50 60 47 50 3 3.9 35 40 31 33 KCA210S4 575V - 3 Ph 7.4 50 7.4 50 7.4 50 1 (3) 1 (2) 15 5 6.1 40 40 34 36 7.5 9 45 45 37 39
3 10.6 90 100 80 85
15 5 16.7 100 100 86 91
Unit Only With (2) 0.33 HP Power Exhaust Unit Only With (2) 0.33 HP
Protection Minimum Circuit
Power Exhaust Ampacity ELECTRIC HEAT DATA Electric Heat Voltage 2 Unit+ 15 kW Maximum 30 kW Electric Heat Overcurrent 45 kW Protection 60 kW 90 kW 3 Unit+ 15 kW Minimum 30 kW Electric Heat Circuit 45 kW Ampacity 60 kW 90 kW 2 15 kW Unit+ Maximum 30 kW Electric Heat Overcurrent 45 kW and (2) 0.33 HP Protection 60 kW Power Exhaust 90 kW 3 15 kW Unit+ Minimum 30 kW Electric Heat Circuit 45 kW and (2) 0.33 HP Ampacity 60 kW Power Exhaust 90 kW ELECTRICAL ACCESSORIES Disconnect Unit Only Unit + Power Exhaust Unit + Electric Heat 15 kW Unit + Electric Heat 30 kW Unit + Electric Heat 45 kW Unit + Electric Heat 60 kW Unit + Electric Heat 90 kW Unit + Power Exhaust + Elec. Heat 15 kW Unit + Power Exhaust + Elec. Heat 30 kW Unit + Power Exhaust + Elec. Heat 45 kW Unit + Power Exhaust + Elec. Heat 60 kW Unit + Power Exhaust + Elec. Heat 90 kW
208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V 90 90 100 100 110 110 45 50 50 35 40 45 100 110 100 125 110 125 60 60 60 45 45 50 150 150 150 175 150 175 80 80 90 60 70 70 150 175 150 175 175 175 80 90 90 70 70 70 225 250 225 250 225 250 125 125 125 100 100 100 80 80 86 86 95 95 41 44 47 31 34 37 92 104 100 112 109 121 52 55 59 41 44 48 131 149 139 157 148 166 74 78 82 60 62 66 175 79 82 86 63 66 69 139 158 146 166 156 201 230 209 238 218 247 115 118 123 92 95 98 100 100 100 100 110 110 50 50 60 40 40 45 100 110 110 125 125 150 60 60 70 45 50 50 150 175 150 175 175 175 80 90 90 70 70 70 150 175 175 175 175 200 90 90 90 70 70 80 225 250 225 250 225 300 125 125 150 100 100 110 85 85 91 91 100 100 43 46 50 33 36 39 98 110 106 118 115 127 55 58 63 44 47 50 137 155 145 163 154 172 77 81 85 62 65 68 145 164 152 172 162 181 82 85 90 66 68 72 207 236 215 244 224 253 118 122 126 94 97 101 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86
Extremes of operating range are plus and minus 10% of line voltage. HACR type breaker or fuse. Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. 4 Disconnect must be field furnished.
20 TON STANDARD EFFICIENCY 1 Voltage - 60hz Compressor 1 Rated Load Amps Locked Rotor Amps Compressor 2 Rated Load Amps Locked Rotor Amps Compressor 3 Rated Load Amps Locked Rotor Amps Outdoor Fan Full Load Amps (total) Motors (3) Power Exhaust (total) (2) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower Horsepower Full Load Amps Motor
208/230V - 3 Ph 22.4 149 22.4 149 22.4 149 2.4 (9.6) 2.4 (4.8) 460V - 3 Ph 10.6 75 10.6 75 10.6 75 1.3 (5.2) 1.3 (2.6) 10 30.8 125 150 116 121 5 7.6 50 60 48 50 15 7.5 11 60 60 51 54 10 14 60 70 55 58 5 6.1 40 40 36 38 KCA240S4 575V - 3 Ph 7.7 54 7.7 54 7.7 54 1 (4) 1 (2) 15 7.5 9 45 45 39 41 10 11 50 50 41 43
5 16.7 110 125 100 104
15 7.5 24.2 125 125 108 112
Unit Only With (2) 0.33 HP Power Exhaust
Unit Only With (2) 0.33 HP
208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V 110 110 125 125 125 125 50 60 60 40 45 50 110 125 125 125 125 150 60 60 70 45 50 50 150 175 150 175 175 175 80 90 90 70 70 70 150 175 175 175 175 200 90 90 90 70 70 80 225 250 225 250 250 300 125 125 150 100 100 110 100 100 108 108 116 116 48 51 55 36 39 41 100 112 109 121 117 129 55 59 63 44 48 50 139 157 148 166 156 174 78 82 86 62 66 68 183 82 86 90 66 69 72 146 166 156 175 164 209 238 218 247 227 256 118 123 126 95 98 101 125 125 125 125 150 150 60 60 70 40 45 50 125 125 125 150 150 150 60 70 70 50 50 60 150 175 175 175 175 200 90 90 90 70 70 80 175 175 175 200 175 200 90 90 100 70 80 80 225 250 225 300 250 300 125 150 150 100 110 110 104 104 112 112 121 121 50 54 58 38 41 43 106 118 115 127 123 135 58 63 66 47 50 53 145 163 154 172 162 180 81 85 89 65 68 71 152 172 162 181 170 189 85 90 93 68 72 74 215 244 224 253 233 262 122 126 130 97 101 103 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W87 54W87 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W87 54W87 54W87 54W87 54W85 54W85 54W86 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W86 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86
Extremes of operating range are plus and minus 10% of line voltage. HACR type breaker or fuse. 3 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. 4 Disconnect must be field furnished.
25 TON STANDARD EFFICIENCY 1 Voltage - 60hz Compressor 1 Rated Load Amps Locked Rotor Amps Compressor 2 Rated Load Amps Locked Rotor Amps Compressor 3 Rated Load Amps Locked Rotor Amps Outdoor Fan Full Load Amps (total) Motors (3) Power Exhaust (2) 0.33 HP Service Outlet 115V GFI (amps) Indoor Blower Horsepower Full Load Amps Motor
208/230V - 3 Ph 25 164 25 164 25 164 2.4 (9.6) 2.4 (4.8) 5 16.7 125 125 108 113 15 7.5 24.2 125 125 116 120 10 30.8 150 150 124 128 5 7.6 60 60 53 56 460V - 3 Ph 12.2 100 12.2 100 12.2 100 1.3 (5.2) 1.3 (2.6) 15 7.5 11 60 70 56 59 10 14 70 70 60 62
KCA300S4 575V - 3 Ph 9 78 9 78 9 78 1 (4) 1 (2) 5 6.1 45 50 40 42 15 7.5 9 50 50 43 45 10 11 50 50 45 47
Full Load Amps (total)
Power Exhaust Ampacity ELECTRIC HEAT DATA Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V 2 Unit+ 15 kW 125 125 125 125 150 150 60 60 70 45 50 50 Maximum 30 kW 125 125 125 125 150 150 60 60 70 45 50 50 Electric Heat Overcurrent 45 kW 150 175 150 175 175 175 80 90 90 70 70 70 Protection 60 kW 150 175 175 175 175 200 90 90 90 70 70 80 90 kW 225 250 225 250 250 300 125 125 150 100 100 110 15 kW 30 kW 45 kW Ampacity 60 kW 90 kW 2 15 kW Unit+ Maximum 30 kW Electric Heat Overcurrent 45 kW and (2) 0.33 HP Protection 60 kW Power Exhaust 90 kW 3 15 kW Unit+ Minimum 30 kW Electric Heat Circuit 45 kW and (2) 0.33 HP Ampacity 60 kW Power Exhaust 90 kW ELECTRICAL ACCESSORIES Disconnect Unit Only Unit + Power Exhaust Unit + Electric Heat 15 kW Unit + Electric Heat 30 kW Unit + Electric Heat 45 kW Unit + Electric Heat 60 kW Unit + Electric Heat 90 kW Unit + Power Exhaust + Elec. Heat 15 kW Unit + Power Exhaust + Elec. Heat 30 kW Unit + Power Exhaust + Elec. Heat 45 kW Unit + Power Exhaust + Elec. Heat 60 kW Unit + Power Exhaust + Elec. Heat 90 kW
108 108 139 146 209 125 125 150 175 225 113 113 145 152 215
108 112 157 166 238 125 125 175 175 250 113 118 163 172 244
116 116 148 156 218 125 125 175 175 225 120 120 154 162 224
116 121 166 175 247 125 150 175 200 300 120 127 172 181 253
124 124 156 164 227 150 150 175 175 250 128 128 162 170 233
124 129 174 183 256 150 150 200 200 300 128 135 180 189 262
53 55 78 82 118 60 60 90 90 125 56 58 81 85 122
56 59 82 86 123 70 70 90 90 150 59 63 85 90 126
60 63 86 90 126 70 70 90 100 150 62 66 89 93 130
40 44 62 66 95 50 50 70 70 100 42 47 65 68 97
43 48 66 69 98 50 50 70 80 110 45 50 68 72 101
45 50 68 72 101 50 60 80 80 110 47 53 71 74 103
54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W87 54W87 54W87 54W87 54W85 54W85 54W85 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W85 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W86 54W86 54W86 54W86 54W85 54W85 54W85 54W85 54W85 54W85 54W86 54W86 54W87 54W87 54W87 54W87 54W85 54W85 54W86 54W85 54W85 54W85 54W87 54W87 54W87 54W87 54W87 54W87 54W86 54W86 54W86 54W85 54W85 54W86 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 4 N/A 54W86 54W86 54W86 54W86 54W86 54W86
ELECTRIC HEAT CAPACITIES
Volts Input 208 220 230 240 440 460 480 550 575 600 15 kW 30 kW 45 kW 60 kW 90 kW kW Btuh No. of kW Btuh No. of kW Btuh No. of kW Btuh No. of kW Btuh No. of Input Output Stages Input Output Stages Input Output Stages Input Output Stages Input Output Stages 11.3 12.6 13.8 15.0 12.6 13.8 15.0 12.6 13.8 15.0 38,600 43,000 47,100 51,200 43,000 47,100 51,200 43,000 47,100 51,200 1 1 1 1 1 1 1 1 1 1 22.5 25.2 27.5 25.2 27.5 25.2 27.5 76,800 86,000 93,900 86,000 93,900 86,000 93,900 1 1 1 1 1 1 1 1 1 1 33.8 115,300 2 2 2 2 2 2 2 2 2 2 45.0 153,600 50.4 172,000 55.1 188,000 60.0 204,800 50.4 172,000 55.1 188,000 60.0 204,800 50.4 172,000 55.1 188,000 60.0 204,800 2 2 2 2 2 2 2 2 2 2 67.6 230,700 75.6 258,000 82.7 282,200 90.0 307,100 75.6 258,000 82.7 282,200 90.0 307,100 75.6 258,000 82.7 282,200 90.0 307,100 2 2 2 2 2 2 2 2 2 2 37.8 129,000 41.3 141,000 45.0 153,600 37.8 129,000 41.3 141,000 45.0 153,600 37.8 129,000 41.3 141,000 45.0 153,600
30.0 102,400
MANUFACTURERS NUMBERS
Drive No. H.P.
ADJUSTABLE SHEAVE Supplier No. 1VP40x7/8 1VP40x7/8 1VP50x11/8 1VP65x11/8 1VP60x11/8 1VP65x13/8 1VP60x13/8 1VP65x13/8 1VP65x13/8 1VP65x13/8 OEM Part No. 79J0301 79J0301 P81977 10023903 41C1301 78M7101 78L5501 78M7101 78M7101 78M7101
DRIVE COMPONENTS FIXED SHEAVE Supplier No. BK95X17/16 BK72x1-7/16 BK100x1-7/16 BK110H BK90H BK110H BK90H BK90H 1B5V86 1B5V80 OEM Part No. 80K1601 10024413 39L1301 10078806 10078804 10078806 10078804 10078804 78M8301 10024005
BELTS Supplier No. BX59 BX55 BX61 BX65 BX61 BX66 BX63 BX64 5VX670 5VX660 OEM Part No. 59A5001 63K0501 93J9801 10024508 93J9801 97J5901 97J5501 97J5801 10024521 10024520
SPLIT BUSHING Supplier No. N/A N/A N/A H17/16 H17/16 H17/16 H17/16 H17/16 B17/16 B17/16 OEM Part No. N/A N/A N/A 49M6201 49M6201 49M6201 49M6201 49M6201 10024601 10024601
Min 535 710 685 850 945 850 945 1045 1045 1135
Max 725 965 865 1045 1185 1045 1185 1285 1285 1365
5 5 7.5 7.5, 10 7.5 10 10
KCA PARTS ARRANGEMENT
FILTERS (SIX 24 X 24 X 2") ECONOMIZER DAMPERS (OPTIONAL) INDOOR COIL OUTDOOR FANS (3 FANS ON 180 & 210 UNITS)
OUTDOOR COILS (RIGHT COIL IS VERTICAL ON 180 & 210 UNITS)
COMPRESSORS TB1 ELECTRIC HEAT
KCA CONTROL BOX
Electric Heat Control (Optional) GND K9 K19 K65 T1 T2 DL2 DL5 TB1 GND C18 K3 S42 K1 K2 K14 C19 TB13 F18 F10 F6 K10 K66 K67 K149 C1 C2 C18
KCA unit components are shown in figure 1. All units come standard with removeable unit panels. All L1, L2 and L3 wiring is color coded; L1 is red, L2 is yellow and L3 is blue.
7Control Transformer T18 (210, 240, & 300 only)
T18 is a single line voltage to 24VAC transformer used in 210, 240 and 300 units only. Transformer T18 is protected by a 3.5 amp circuit breaker (CB18) located on the transformer itself. T18 is identical to transformer T1. The transformer supplies 24VAC power to the contactors.
AControl Box Components
KCA control box components are shown in figure 2. The control box is located in the compressor compartment.
8Terminal Strip TB1
All indoor thermostat connections will be to TB1 located on the control panel. For thermostats with occupied and unoccupied" modes, a factory installed jumper across terminals R and OC should be removed. Unit wiring is designed for a twostage thermostat. See table 1. TABLE 1 TB1 TERMINAL DESIGNATIONS
Y1 Y2 W1 W2 OC G R C Cool Stage 1 Cool Stage 2 Heat Stage 1 Heat Stage 2 Occupied Indoor Blower 24V To Thermostat Ground
1Disconnect Switch S48 (field or factory installed)
All units may be equipped with an optional disconnect switch S48. S48 can be a toggle switch or a twist style switch. Both types can be used by the service technician to disconnect power to the unit.
2Terminal Strip TB2
Unit without S48 will have supply power connected to TB2.
3Fuse F4
Fuse F4 is used only with single point power supply. F4 gives over amperage protection to the compressor and other cooling components. F4, S48 and TB2 are located inside a sheet metal enclosure in the unit left front corner mullion.
4Terminal Strip TB13
All units are equipped with TB13. TB13 is located on the control panel in the compressor compartment.
9Outdoor Fan Capacitors C1, C2, C18 (all units) & C19 (240 & 300 only)
Fan capacitors C1, C2, C18, C19 are 10 MFD / 370V capacitors used to assist in the start up of condenser fans B4, B5, B21, B22 (240 & 300 only) respectively.
5Control Transformer T1
All use a single line voltage to 24VAC transformer mounted in the control box. Transformer supplies power to control circuits in the unit. The transformer is rated at 70VA and is protected by a 3.5 amp circuit breaker (CB8) which is located on the transformer itself. The 208/230 (Y) voltage transform208/230V TRANSFORMER ers have two primary SECONDARY voltage taps, but only one may be used de208 VOLTS pending on supply voltage. See figure 3. 460 230 VOLTS (G) and 575 (J) voltage PRIMARY transformers use a FIGURE 3 single primary voltage tap.
10Outdoor Fan Relay K10 (all units) & K149 (240 & 300 only)
Outdoor fan relays K10 and K149, are DPDT relays with a 24VAC coil. For 180 and 210 units, K10 energizes condenser fans B4, B5 and B21. For 240 and 300 units, K10 energizes condenser fans B4 and B5 and K149 energizes condenser fans B21 and B22.
11Fuses F10 and F6 (240 & 300 Y volt only)
Three F10 line voltage fuses provide overcurrent protection to condenser fans and are rated at 30A. Two F6 line voltage fuses provide overcurrent protection for optional field installed power exhaust fans (Y volt 240 300 units) and are rated at 30A.
6C. A. I. Transformers T3 & T13 575V Only
All KCA 575 (J) voltage units use transformers T3 and T13 mounted in the control box. The transformers have an output rating of 0.75A. T3 transformer supplies 230 VAC power to combustion air inducer motor B6 and T13 supplies 230 VAC to combustion air inducer motor B15.
12Compressor Contactor K1 & K2 (all units) K14 (210, 240, & 300 units only)
All compressor contactors are three-pole-double-break contactors with 24VAC coils. K1 and K2 energize compressors B1 and B2 respectively, in response to thermostat demand. For 210, 240 and 300 units, K14 energizes compressor B13 in response to thermostat demand.
13Blower Contactor K3
Blower contactor K3, used in all units, is a three-pole-doublebreak contactor with a 24VAC coil used to energize the indoor blower motor B3 in response to blower demand. K3 is energized from terminal G on TB1.
15Power Exhaust Relay K65 (PED units)
Power exhaust relay K65 is a DPDT relay with a 24VAC coil. K65 is used in units equipped with the field installed optional power exhaust dampers. K65 is energized by the economizer enthalpy control A6, after the economizer dampers reach 50% open (adjustable) When K65 closes, exhaust fans B10 and B11 are energized.
14Blower Motor Overload Relay S42
S42 is a manual reset overload relay, used in all M voltage units and in units with a 10 HP blower motor. The relay is connected in line with the blower motor to monitor the current flow to the motor. When the relay senses an overload condition, a set of normally closed contacts opens deenergizing the 24 volt output of T1. See figure figure 4.
14Cooling Stage Pilot Relays K66 and K67
Cooling stage pilot relays are DPDT relays with a 24VAC coil. These relays prevent voltage drop caused by long thermostat wiring when the thermostat is used to energize compressor contactors directly. K66 is energized by a Y1 thermostat call. N.O. contact K661 will close allowing 24VAC from T1 transformer to energize stage 1 compressor contactors. K67 is energized by a Y2 thermostat call. N.O. contacts K671 will close allowing 24VAC from T1 transformer (180 units) or T18 (210300 units) to energize stage 2 compressor contactor(s).
BLUE RESET BUTTON IN FACTORY-SET AUTO MODE (Turn clockwise to H for manual reset) GREEN TRIP INDICATOR (Flush with surface not tripped; Above surface tripped)
RED TEST BUTTON
AMP ADJUSTMENT DIAL
Adjust relay amp setting according to value given on the blower motor nameplate. Proper relay amp setting equals motor nameplate FLA X service factor of 1.15 X .95. Use small slotted screwdriver to adjust control mode from automatic reset (A) to manual reset (H). Control must be in the manual reset mode (H) to perform a test. Press the red test button. Green trip indicator should pop out. Press the blue reset screw to reset the relay.
KCA180 PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL
CONDENSER COILS STAGE 1
STAGE 2 STAGE 2 STAGE 1
FREEZESTAT FOR EACH STAGE OF COIL (LOCATED ON RETURN BEND)
COMPRESSOR (B1) SUCTION LINE
HIGH PRESSURE SWITCH (S4)
KCA210 PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL
STAGE 1 CONDENSER COILS
FREEZESTATS (3) ONE FOR EACH STAGE OF COIL (LOCATED ON RETURN BEND)
STAGE 2 EVAPORATOR COIL
STAGE 1 EVAPORATOR COIL
DRIERS (3)
STAGE 2 CONDENSER COILS
KCA240 & 300 PLUMBING, COMPRESSOR AND REFRIGERANT CIRCUITS DETAIL
BCooling Components
All units use independent cooling circuits consisting of separate compressors, condenser coils and evaporator coils. See figures 5, 6 and 7. Drawthrough type condenser fans are used in all units. All units are equipped with belt-drive blowers which draw air across the evaporator during unit operation. Cooling may be supplemented by an optional factory or field-installed economizer. The evaporators are slab type and are stacked. Each evaporator uses a thermostatic expansion valve as the primary expansion device. Each evaporator is also equipped with enhanced fins and rifled tubing. In all units each compressor is protected by a freezestat (on each evaporator) and a high pressure switch (on each discharge line). Optional field installed low ambient switches are available for additional compressor protection.
3Low Ambient Switches (optional) S11, S84 (all units) & S85 (210, 240, 300 units)
The low ambient switch is an optional field installed auto-reset N.O. pressure switch which allows for mechanical cooling operation at low outdoor temperatures. The switch is located in each liquid line prior to the indoor coil. In 180 units, S11 and S84 are wired in parallel with outdoor fan relay K10 coil. Both S11 and S84 have to be open to de energize condenser fans (all three fans will be deenergized at the same time). Either S11 or S84 closing will return all three condenser fans to operation. In 210 units, S11, S84 and S85 are wired in parallel with outdoor fan relay K10 coil. All three low ambient switches; S11, S84 and S85 have to be open to deenergize condenser fans (all three fans will be deenergized at the same time). Any one low ambient switch, S11, S84, or S85 closing will return all three condenser fans to operation. In 240 and 300 units, S11 is wired in series with outdoor fan relay K10 coil. When S11 opens, condenser fans 1 and 2 are deenergized. When S11 closes, both condenser fans 1 and 2 will return to operation. S84 and S85 are wired in parallel with outdoor fan relay coil K149. Both S84 and S85 have to be open to energize condenser fans 3 and 4. Either S84 or S85 closing will return condenser fans 3 and 4 to operation. When liquid pressure rises to 450 10 psig (3103 69 kPa), pressure switch(es) close, energizing the appropriate condenser fan(s). When liquid pressure drops to 240 10 psig (1655 69 kPa), pressure switch(es) open, deenergizing the appropriate condenser fan(s). Intermittent fan operation results in higher evaporating temperature allowing the system to operate without icing the evaporator coil and losing capacity.
1Compressors B1, B2 (all units) & B13 (210/240/300 only)
All KCA180/300 units use scroll compressors. KCA180 units uses two compressors and KCA210, 240 and 300S use three compressors. All compressors are equipped with independent cooling circuits. Compressor capacity may vary from stage to stage. In all cases, the capacity of each compressor is added to reach the total capacity of the unit. See SPECIFICATIONS" and ELECTRICAL DATA" (table of contents) or compressor nameplate for compressor specifications.
Electrical shock hazard. Compressor must be grounded. Do not operate without protective cover over terminals. Disconnect power before removing protective cover. Discharge capacitors before servicing unit. Failure to follow these precautions could cause electrical shock resulting in injury or death.
4Filter Drier (all units)
KCA units have a filter drier located in the liquid line of each refrigerant circuit at the exit of each condenser coil. The drier removes contaminants and moisture from the system.
Each compressor is energized by a corresponding compressor contactor. NOTERefer to the wiring diagram section for specific unit operation.
5Freezestats S49, S50 (all units) S53 (210, 240, 300 units only)
Each unit is equipped with a low temperature switch located on a return bend of each evaporator coil. S49 (first circuit), S50 (second circuit) and S53 (third circuit) are located on the corresponding evaporator coils. Each freezestat is wired in series with the corresponding compressor contactor. Each freezestat is an autoreset switch which opens at 29F + 3F (-1.7C + 1.7C) on a temperature drop and closes at 58 F + 4 F (14.4 C + 2.2 C) on a temperature rise. To prevent coil icing, Freezestats open during compressor operation to temporarily disable the respective compressor until the coil temperature rises.
2High Pressure Switches S4, S7 (all units) S28 (210, 240, 300S only)
The high pressure switch is a manual reset N.C switch which opens on a pressure rise. S4 (first circuit), S7 (second circuit) and S28 (third circuit) are wired in series with the respective compressor contactor coils. When discharge pressure rises to 640 10 psig (4413 69 kPa) (indicating a problem in the system) the switch opens and the respective compressor is deenergized (the economizer can continue to operate).
6Condenser Fans B4, B5, B21 (all units) & B22 (240 & 300 only)
See SPECIFICATIONS tables at the front of this manual for specifications of condenser fans used in all units. All condenser fans used have singlephase motors. The fan assembly may be removed for servicing and cleaning.
OPERATION / ADJUSTMENT Blower Operation
Initiate blower demand at thermostat according to instructions provided with thermostat. Unit will cycle on thermostat demand. The following steps apply to applications using a typical electormechanical thermostat. 1 Blower operation is manually set at the thermostat subbase fan switch. With fan switch in ON position, blowers will operate continuously. 2 With fan switch in AUTO position, the blowers will cycle with demand. Blowers and entire unit will be off when system switch is in OFF position.
CBlower Compartment
The blower compartment in KCA180/300 units is located between the evaporator coil and the compressor / control section on the opposite side of the condenser coil. The blower assembly is accessed by removing the screws on either side of the sliding base. The base pulls out as shown in figure 8.
1Blower Wheels
All KCA180/300 units have two 15 in. x 15 in. (381 mm x 381 mm) blower wheels. Both wheels are driven by one motor mounted on a single shaft. Shaft bearings are equipped with grease ports for service.
Blower Access
The blower assembly is secured to a sliding base which allows the entire assembly to be pulled out of the unit. See figure 8. 1 Remove the clamp which secures the blower wiring to the blower motor base. 2 Remove and retain screws on either side of sliding base. Pull base toward outside of unit. When pulling the base out further than 12" (305mm), disconnect wiring to K3 blower contactor T1, T2 and T3. Pull wiring toward blower to allow enough slack to slide the base out further.
2Indoor Blower Motor B3
All units use three-phase single-speed blower motors. CFM adjustments are made by adjusting the motor pulley (sheave). Motors are equipped with sealed ball bearings. All motor specifications are listed in the SPECIFICATIONS (table of contents) in the front of this manual. Units may be equipped with motors manufactured by various manufacturers, therefore electrical FLA and LRA specifications will vary. See unit rating plate for information specific to your unit.
TO INCREASE CFM
LOOSEN ALLEN SCREW & TURN PULLEY CLOCKWISE
TO INCREASE BELT TENSION 1Loosen four screws securing blower motor to sliding base. 2Turn adjusting screw to the left, or counterclockwise, to move the motor downward and tighten the belt. 3Tighten four screws. BELT TENSION ADJUSTING SCREW
TO DECREASE CFM
TURN PULLEY COUNTERCLOCKWISE
BLOWER ASSEMBLY SLIDING BASE
LOOSEN (4) SCREWS ON MOTOR BASE TO ALLOW MOTOR TO MOVE. SIDE VIEW PULLEY
ALLEN SCREW PULLEY
REMOVE SCREWS TO SLIDE BLOWER ASSEMBLY OUT OF UNIT
FIGURE 8 Page 22
3 Slide base back into original position when finished servicing. Replace the clamp and blower wiring in the previous location on the blower motor base. Reconnect wiring to K3 if it was disconnected. 4 Replace retained screws on either side of the sliding base.
2 To relieve belt tension Turn adjusting bolt to the right, or clockwise, to move the motor upward and loosen the belt. This decreases the distance between the blower motor pulley and the blower housing pulley. To increase belt tension Turn the adjusting bolt to the left, or counterclockwise to increase belt tension. This increases the distance between motor pulley and blower housing pulley (motor moves downward and tightens belt). 3 Tighten four bolts securing motor base to mounting frame. IMPORTANT Align top edges of blower motor base and mounting frame base parallel before tightening bolts on the both sides of base. Motor shaft and blower shaft must be parallel.
Determining Unit Air Volume
1 The following measurements must be made with a dry indoor coil. Run blower without cooling demand. Air filters must be in place when measurements are taken. 2 With all access panels in place, measure static pressure external to unit (from supply to return). 3 Measure the indoor blower wheel RPM. 4 Refer to blower tables in BLOWER DATA (table of contents) in the front of this manual. Use static pressure and RPM readings to determine unit air volume. 5 The RPM can be adjusted at the motor pulley. Loosen Allen screw and turn adjustable pulley clockwise to increase RPM. Turn counterclockwise to decrease RPM. See figure 8 for KCA180/300 units.
Overtensioning belts shortens belt and bearing life. Check belt tension as follows: 1 Measure span length X. See figure 10. 2 Apply perpendicular force to center of span (X) with enough pressure to deflect belt 1/64" for every inch of span length or 1.5mm per 100mm of span length. Example: Deflection distance of a 40" span would be 40/64" or 5/8". Example: Deflection distance of a 400mm span would be 6mm. 3 Measure belt deflection force. For a used belt, the deflection force should be 5 lbs. (35kPa). A new belt deflection force should be 7 lbs. (48kPa). A force below these values indicates an undertensioned belt. A force above these values indicates an overtensioned belt.
Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if proper pulley alignment and belt tension are maintained. Tension new belts after a 2448 hour period of operation. This will allow belt to stretch and seat grooves. Make sure blower and motor pulley are aligned as shown in figure 9. PULLEY ALIGNMENT
MEASURE BELT TENSION
FIGURE 9 1 Loosen four bolts securing motor base to mounting frame. See figure 8.
DEFLECTION 1/64" PER INCH OF SPAN OR 1.5mm PER 100mm OF SPAN
DOptional Electric Heat Components
See ELECTRICAL / ELECTRIC HEAT (table of contents) for possible KCA to EHA matchups and electrical ratings. All electric heat sections consist of electric heating elements exposed directly to the air stream. See figure 1. Two electric heat sections (first section and second section) are used in all 15kW through 90kW heaters used in KCA180/300 units. Multiple-stage elements are sequenced on and off in response to thermostat demand. EHA parts arrangement is shown in figures 12 and 13.
3Time Delay DL2
DL2 is a solid state timer used in all electric heat units. DL2 staggers the energizing of the first (W1) and second (W2) stage heating elements by providing a timed interval. When the timer is deenergizing, the contacts are delayed 1 second before opening.
4Time Delay DL5
Time delay DL5 is identical to DL2. DL5 further staggers the (W2) second stage heating elements by providing a timed interval between the energizing of the elements activated by DL2 and elements activated by DL5. ELECTRIC HEAT CONTROL (HAT) ASSEMBLY 180300S UNITS
RELAY K9, K19
The main control box (see figure 2) houses some electric heat components and the electric heat control hat" section (figure 11).
Electric Heat Hat Section (Figure 11) 1Electric Heat Relay K9
All KCA series units with electric heat use an electric heat relay K9. K9 is a N.O. DPDT pilot relay intended to electrically isolate the units 24V circuit from the electric heat assembly 24V circuit. K9 is energized by W1 TB1. K91 closes, enabling T2 to energize the electric heat.
2Electric Heat Relay K19
All KCA series units with electric heat use an electric heat relay K19. K19 is a N.O. SPDT pilot relay intended to electrically isolate the units 24V circuit from the electric heat assembly 24V circuit. K19 is energized by TB1 (once K9 is energized). K191 closes, enabling T2 to energize the remaining electric heat.
TRANSFORMER T2
TIME DELAY DL2, DL5
EHA 15, 30, 45, 60 and 90 KW ELECTRIC HEAT SECTION PARTS ARRANGEMENT
HEATING ELEMENTS HE1 HE14
ELECTRIC HEAT VESTIBULE
CONTROL WIRE HARNESS PRIMARY ELECTRIC HEAT LIMIT S15(1ST SECTION) S107(2nd SECTION)
KCA180/300 ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT
TERMINAL STRIP (TB3)
FIRST HEAT SECTION (LEFT SIDE)
FUSE F3 F3 - 1
FUSE F3 F3 - 2
FIRST STAGE ELECTRIC HEAT CONTACTOR K15
SECOND STAGE ELECTRIC HEAT CONTACTOR K16
FUSE F3 F3 - 3
FUSE F3 F3 - 4
SECOND HEAT SECTION (RIGHT SIDE)
FUSE F3 F3 - 5
FUSE F3 F3 - 6
FIRST STAGE ELECTRIC HEAT CONTACTOR K17
SECOND STAGE ELECTRIC HEAT CONTACTOR K18
FUSE F3 F3 - 7
FUSE F3 F3 - 8
5Electric Heat Transformer T2
All KCA series units with electric heat use a single line voltage to 24VAC transformer mounted in the electric heat control hat section in the control box. The transformer supplies power to all electric heat controls (contactors and coils). The transformer is rated at 70VA and is protected by a 3.5 amp circuit breaker CB13 located on the body of T2. The 208/230 (Y) voltage transformers use two primary voltage taps as shown in figure 3. Transformer T2 is identical to T1.
strip TB3 (or a fuse block on some models) located in the upper left corner of the electric heat vestibule.
9High Temperature Limits S15 and S107 (Primary)
S15 and S107 are SPST N.C. auto-reset thermostats located on the back panel of the electric heat section below the heating elements. S15 is the high temperature limit for the first electric heat section, while S107 is the high temperature limit for the second electric heat section. Both thermostats are identical and are wired in series with the first stage contactor coil. When either S15 or S107 opens, indicating a problem in the system, contactor K15 is de-energized. When K15 is de-energized, first stage and all subsequent stages of heat are de-energized. The thermostats used on EHA360-45-1 Y/G/J are factory set to open at 200_F + 5_F (93.3_C + 2.8_C) on a temperature rise and automatically reset at 160_F + 6_F (71.1_C + 3.3_C) on a temperature fall. All other electric heat section thermostats are factory set to open at 170_F + 5_F (76.7_C + 2.8_C) on a temperature rise and automatically reset at 130_F + 6_F (54.4_C + 3.3_C) on a temperature fall. The thermostats are not adjustable.
Electric Heat Sections 6Contactors K15, K16, K17 and K18
Contactors K15, K16, K17 and K18 are all three-pole double-break contactors located on the electric heat vestibule. K15 and K16 are located on the first electric heat section, while K17 and K18 are located on the second electric heat section. However, in the 15 and 30kW heaters, the first section houses all contactors and fuses. All contactors are equipped with a 24VAC coil. The coils in the K15, K16, K17 and K18 contactors are energized by the main panel A45. Contactors K15 and K17 energize the first stage heating elements, while K16 and K18 energize the second stage heating elements.
10Heating Elements HE1 through HE14
Heating elements are composed of helix wound bare nichrome wire exposed directly to the air stream. Three elements are connected in a three-phase arrangement. The 7Fuse F3 elements in 208/230V units are connected in a Delta" arFuse F3 are housed in a fuse block which holds three fuses. rangement. Elements in 460 and 575V units are connected Each F3 fuse is connected in series with each leg of electric in Wye" arrangement. Each stage is energized indepenheat. Figure 13 and table 2 show the fuses used with each dently by the corresponding contactors located on the elecelectric heat section. For simplicity, the service manual latric heat vestibule panel. Once energized, heat transfer is bels the fuses F3 1 through F3 8. instantaneous. High temperature protection is provided by 8Terminal Strip TB3 primary and redundant high temperature limits and overElectric heat line voltage connections are made to terminal current protection is provided by fuses. TABLE 2 KCA180/300 ELECTRIC HEAT SECTION FUSE RATING EHA QUANTITY & SIZE
(1) EHA2407.5 & (1) EHA240S7.5 (15 kW Total) (1) EHA36015 & (1) EHA360S15 (30 kW Total) or (1) EHA15615 & (1) EHA156S15 (2) EHA36022.5 (45 kW Total) or (2) EHA15622.5 (2) EHA15030 (60 kW Total) or (2) EHA15630
208/230V 460V 575V 208/230V 460V 575V 208/230V 460V 575V 208/230V 460V 575V 208/230V
FUSE (3 each) F3 1
50 Amp 250V 25 Amp 600V 20 Amp 600V 60 Amp 250V 50 Amp 600V 40 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V
60 Amp 250V
25 Amp 250V 15 Amp 600V 10 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V 60 Amp 250V 50 Amp 600V 40 Amp 600V
50 Amp 250V 25 Amp 600V 20 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V 50 Amp 250V 25 Amp 600V 20 Amp 600V
(2) EHA36045 (90 kW Total)
Make sure the unit is installed in accordance with the installation instructions and all applicable codes. See accessories section for conditions requiring use of the optional roof mounting frame (LARMF18/36 or LARMFH18/24).
4. 180 Units contain two refrigerant circuits or systems. Evaporator and condenser coil refrigerant circuit 1 makes up stage 1 cooling. Evaporator and condenser coil refrigerant circuit 2 makes up stage 2 cooling. See figure 14. 210, 240, 300 Units contain three refrigerant circuits or systems. Evaporator and condenser coil refrigerant circuits 1 and 2 make up stage 1 cooling. Evaporator and condenser refrigerant circuit 3 makes up stage 2 cooling. See figure 15. 5. 180, 210 Firststage thermostat demand will energize condenser fans 1, 2 and 3. Fans will continue to operate with additional thermostat demands. See figure 14. 180 AND 210 UNIT CONDENSER FANS
COND. FAN 1 COND. FAN 2 COND. FAN 3
IIISTARTUP OPERATION
Refer to startup directions and to the unit wiring diagram when servicing. See unit nameplate for minimum circuit ampacity and maximum fuse size.
APreliminary and Seasonal Checks
1 Make sure the unit is installed in accordance with the installation instructions and applicable codes. 2 Inspect all electrical wiring, both field and factory installed for loose connections. Tighten as required. Refer to unit diagram located on inside of unit control box cover. 3 Check to ensure that refrigerant lines are in good condition and do not rub against the cabinet or other refrigerant lines. 4 Check voltage at the disconnect switch (if applicable) or TB2. Voltage must be within the range listed on the nameplate. If not, consult the power company and have the voltage corrected before starting the unit. 5 Recheck voltage and amp draw with unit running. If voltage is not within range listed on unit nameplate, stop unit and consult power company. Refer to unit nameplate for maximum rated load amps. 6 Inspect and adjust blower belt (see section on Blower Compartment Blower Belt Adjustment).
FIGURE 14 240, 300 Firststage thermostat demand will energize condenser fans 1, 2, 3 and 4. See figure 15. Fans will continue to operate with additional thermostat demands. 240 AND 300 UNIT CONDENSER FANS
COND. FAN 3 COND. FAN 1
BCooling Start Up
AOperation 1. Remove coil covers before starting unit. 2. Initiate first and second stage cooling demands according to instructions provided with thermostat. 3. 180 units Firststage thermostat demand will energize compressor 1; a secondstage thermostat demand will energize compressor 2. 210300 units Firststage thermostat demand will energize compressors 1 & 2; a secondstage thermostat demand will energize compressor 3. On units with an economizer, when outdoor air is acceptable, a firststage demand will energize the economizer; a secondstage demand will energize compressor 1 (and compressor 2 on 210300 units).
COND. FAN 4 1 2 3
COND. FAN 2
FIGURE 15 6. Each refrigerant circuit is separately charged with R410A refrigerant. See unit rating plate for correct amount of charge. 7. Refer to Cooling Operation and Adjustment section for proper method to check refrigerant charge.
IVCHARGING
TABLE 3 KCA180 NORMAL OPERATING PRESSURES
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly. Failure to follow this warning may result in personal injury or death. WARNINGDo not exceed nameplate charge under any condition. This unit is factory charged and should require no further adjustment. If the system requires additional refrigerant, reclaim the charge, evacuate the system and add required nameplate charge. NOTE System charging is not recommended below 60F (15C). In temperatures below 60F (15C) , the charge must be weighed into the system. If weighing facilities are not available, or to check the charge, use the following procedure: 1. Attach gauge manifolds and operate unit in cooling mode with economizer disabled until system stabilizes (approximately five minutes). Make sure outdoor air dampers are closed. 2. Check each system separately with all stages operating. 3. Use a thermometer to accurately measure the outdoor ambient temperature. 4. Apply the outdoor temperature to tables 3 through 6 to determine normal operating pressures. Pressures are
listed for sea level applications at 80F dry bulb and 67F wet bulb return air.
Outdoor Coil Entering Air Temp
Circuit 1 Dis. +10 psig 268 310 353 400 449 505 Suc. +5 psig 128 130 132 135 137 141
Circuit 2 Dis. +10 psig 282 325 368 417 470 527 Suc. +5 psig 132 134 135 138 140 144
65_F 75_F 85_F 95_F 105_F 115_F
TABLE 4 KCA210 NORMAL OPERATING PRESSURES
Circuit 1 Dis. Suc. +10 +5 psig psig 290 133 330 136 373 137 421 140 474 143 526 146
Circuit 2 Dis. Suc. +10 +5 psig psig 290 128 330 132 373 135 421 138 474 140 526 142
Circuit 3 Dis. Suc. +10 +5 psig psig 307 133 347 135 390 138 437 140 488 143 540 146
TABLE 5 KCA240 NORMAL OPERATING PRESSURES
Circuit 1 Dis. Suc. +10 +5 psig psig 270 136 313 138 351 140 397 143 450 146 506 149
Circuit 2 Dis. Suc. +10 +5 psig psig 286 135 329 138 366 140 412 143 467 147 522 150
Circuit 3 Dis. Suc. +10 +5 psig psig 285 137 327 140 368 142 414 144 465 147 524 150
TABLE 6 KCA300 NORMAL OPERATING PRESSURES
5. Compare the normal operating pressures to the pressures obtained from the gauges. Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system. Correct any system problems before proceeding. 6. If discharge pressure is high, remove refrigerant from the system. If discharge pressure is low, add refrigerant to the system. S Add or remove charge in increments. S Allow the system to stabilize each time refrigerant is added or removed. 7. Use the following approach method along with the normal operating pressures to confirm readings.
Circuit 1 Dis. Suc. +10 +5 psig psig 290 136 330 138 375 141 423 144 475 146 526 149
Circuit 2 Dis. Suc. +10 +5 psig psig 296 132 338 135 382 137 432 140 486 142 546 144
Circuit 3 Dis. Suc. +10 +5 psig psig 306 137 348 138 394 140 440 142 492 145 550 148
CCharge Verification Approach Method AHRI Testing 1. Using the same thermometer, compare liquid temperature to outdoor ambient temperature. Approach Temperature = Liquid temperature (at condenser outlet) minus ambient temperature. 2. Approach temperatures should match values in table 7. An approach temperature greater than this value indicates an undercharge. An approach temperature less than this value indicates an overcharge.
3 Do not use the approach method if system pressures do not match pressures in tables 3 through 6. The approach method is not valid for grossly over or undercharged systems.
TABLE 7 APPROACH TEMPERATURES Liquid Temp. Minus Ambient Temp.
1st Stage 8F + 1 (4.4C + 0.5) 8F + 1 (4.4C + 0.5) 8F + 1 (4.4C + 0.5) 7F + 1 (3.9C + 0.5) 2nd Stage 8F + 1 (4.4C + 0.5) 8F + 1 (4.4C + 0.5) 8F + 1 (4.4C + 0.5) 7F + 1 (3.9C + 0.5) 3rd Stage
Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to cause cancer.) Fiberglass wool may also cause respiratory, skin and eye irritation. To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown on unit nameplate or contact your supervisor.
180 210 240 300
10F + 1 (5.6C + 0.5) 8F + 1 (4.4C + 0.5) 9F + 1 (5.0C + 0.5)
AFilters
Units are equipped with six 24 X 24 X 2" filters. Filters should be checked and replaced when necessary with filters of like kind and size. Take note of air flow direction marking on filter frame when reinstalling filters. See figure 16. NOTEFilters must be U.L.C. certified or equivalent for use in Canada.
V SYSTEMS SERVICE CHECKS ACooling System Service Checks
KCA units are factory charged and require no further adjustment; however, charge should be checked periodically using the approach method. The approach method compares actual liquid temperature with the outdoor ambient temperature. See section IV CHARGING. NOTEWhen unit is properly charged discharge line pressures should approximate those in tables 3 through 6.
BLubrication
All motors used in KCA units are factory lubricated, no further lubrication is required. Blower shaft bearings are prelubricated. For extended bearing life, relubricate at least once every two years with a lithium base grease such as Alvania 3 (Shell Oil), Chevron BRB2 (Standard OIl) or Regal AFB2 (Texas Oil). Use a hand grease gun for lubrication. Add only enough grease to purge through the bearings so that a bead of grease appears at the seal lip contacts.
Electrical shock hazard. Turn off power to unit before performing any maintenance, cleaning or service operation on the unit.
PULL TO REMOVE FILTERS
Danger of sharp metallic edges. Can cause injury. Take care when servicing unit to avoid accidental contact with sharp edges. FIGURE 16
CEvaporator Coil
Inspect and clean coil at beginning of each cooling season. Clean using mild detergent or commercial coil cleaner. Flush coil and condensate drain with water taking care not to get insulation, filters and return air ducts wet.
ASSEMBLED ROOF MOUNTING FRAME
DCondenser Coil
Clean condenser coil annually with detergent or commercial coil cleaner and inspect monthly during the cooling season. Access panels are provided on the front and back of the condenser section.
ESupply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated dirt or dust. Turn off power before attempting to remove access panel or to clean blower wheel.
FRONT CENTER SUPPORTS (TWO PIECES EACH) END
FElectrical
1 Check all wiring for loose connections. 2 Check for correct voltage at unit (unit operating). 3 Check ampdraw on both condenser fan motor and blower motor. Fan Motor Rating Plate ____ Actual ________ Indoor Blower Motor Rating Plate____ Actual____
TYPICAL FLASHING DETAIL
UNIT BASE BOTTOM UNIT BASE RAIL FIBERGLASS INSULATION (Furnished)
VIIOPTIONAL ACCESSORIES
The accessories section describes the application of most of the optional accessories which can be installed to the KCA units.
ALARMF and LARMFH Mounting Frames
When installing either the KCA units on a combustible surface for downflow discharge applications, the Lennox LARMF18/36 14-inch or 24-inch (356 mm or 610mm) height roof mounting frame is used. For horizontal discharge applications, use LARMFH18/24 26-inch or 37-inch (660mm or 940mm) height roof mounting frame. This frame converts unit from down-flow to horizontal air flow. The 37 inch (940mm) horizontal frame meets National Roofing Code requirements. The roof mounting frames are recommended in all other applications but not required. If the KCA units are not mounted on a flat (roof) surface, they MUST be supported under all edges and under the middle of the unit to prevent sagging. The units MUST be mounted level within 1/16" per linear foot or 5mm per meter in any direction. The assembled LARMF18/36 mounting frame is shown in figure 17. Refer to the roof mounting frame installation instructions for details of proper assembly and mounting. The roof mounting frame MUST be squared to the roof and level before mounting. Plenum system MUST be installed before the unit is set on the mounting frame. Typical roof curbing and flashing is shown in figure 18. Refer to the roof mounting frame installation instructions for proper plenum construction and attachment.
NAILER STRIP (Furnished)
COUNTER FLASHING (Field Supplied) CANT STRIP (Field Supplied)
RIGID INSULATION (Field Supplied)
ROOF MOUNTING FRAME (Extends around entire perimeter of unit)
BTransitions
Optional supply/return transitions LASRT18/24 are available for use with KCA series units utilizing optional LARMF18/36 roof mounting frame. Transition must be installed in the LARMF18/36 mounting frame before mounting the unit to the frame. Refer to the manufacturers instructions included with the transition for detailed installation procedures.
CSupply and Return Diffusers (all units)
Optional flush mount diffuser/return FD11 and extended mount diffuser/return RTD11 are available for use with all KCA units. Refer to manufacturers instructions included with transition for detailed installation procedures.
DK1ECON
Unit may contain an optional modulating economizer equipped with an A6 enthalpy control and an S175 outdoor temperature sensor or A7 enthalpy sensor. The economizer modulates to use outdoor air for free cooling when temperature is suitable. The A6 enthalpy control is located in the economizer access area. See figure 19. The S175 temperature sensor or A7 enthalpy sensor is located on the division panel between horizontal supply and return air sections. Optional Sensors An optional differential sensor (A62) may be used with the A7 outdoor sensor to compare outdoor air enthalpy to return air enthalpy. When the outdoor air enthalpy is below the return air enthalpy, outdoor air is used for free cooling. A mixed air sensor (R1) is used in modulating the dampers to 55F (13C) blower compartment air temperature.
When an optional IAQ sensor is installed, a steady green DCV LED indicates that the IAQ reading is higher than setpoint requiring more fresh air. See figure 20. A6 ENTHALPY CONTROLLER
EXH Set 10V
2V EXH
DAMPER MINIMUM POSITION
Min Pos
IAQ MAXIMUM POSITION
(set higher than minimum position)
2V DCV
DCV Max 10V
IAQ READING IS ABOVE SETPOINT
DCV Set 10V
2V Free Cool
IAQ SETPOINT
OUTDOOR AIR SUITABLE LED
INSTALL ENTHALPY CONTROLLER A6
FREE COOLING SETPOINT; A=Completely counterclockwise D=Completely clockwise
OUTDOOR/ RETURN AIR DIVISION PANEL
Free Cooling Setpoint
B7 ECONOMIZER MOTOR
Single Temperature or Enthalpy Sensing: The enthalpy control (A6) setpoint may be adjusted when an enthalpy (A7) sensor is used to determine outdoor air suitability, See figure 20. Free cooling will be enabled when outdoor air temperature or enthalpy are lower than the free cooling setpoint. The free cooling setpoints for sensible temperature sensors is 55F. Table 8 shows the free cooling setpoints for enthalpy sensors. Use the recommended setpoint and adjust as necessary. For example: At setting A (table 8), free cooling will be enabled when outdoor air enthalpy is lower than 73F and 50% RH. If indoor air is too warm or humid, lower the setpoint to B. At setting B, free cooling will be enabled at 70F and 50% RH. TABLE 8 ENTHALPY FREE COOLING SETPOINTS
Control Setting A* B C D Enthalpy Setpoint At 50% RH 73 F (23 C) 70 F (21 C) 67 F (19 C) 63 F (17 C)
J3 J105 P4 P3
A6 ENTHALPY CONTROLLER
FIGURE 19 An optional IAQ sensor (A63) may be used to lower operating costs by controlling outdoor air based on CO2 level or room occupancy (also called demand control ventilation or DCV). Damper minimum position can be set lower than traditional minimum air requirements; dampers open to traditional ventilation requirements when CO2 level reaches DCV (IAQ) setpoint. Refer to instructions provided with sensors for installation. A6 Enthalpy Control LEDs A steady green Free Cool LED indicates that outdoor air is suitable for free cooling.
*Setting A is recommended.
Differential Sensing: Two sensors can be used to compare outdoor air to return air. When outdoor air is cooler than return air, outdoor air is suitable for free cooling. Adjust the free cooling setpoint to D" in this application. When return air is cooler than outdoor air, the damper will modulate to the minimum position. Damper Minimum Position NOTE A jumper is factoryinstalled between TB1 R and OC terminals to maintain occupied status (allowing minimum fresh air). See figure 21. When using an electronic thermostat or energy management system with an occupied/unoccupied feature, remove jumper. Make wire connections to R and OC as shown in literature provided with thermostat or energy management system literature. Either the jumper wire or optional device must be connected to R and OC for the economizer to function. TB1 TERMINAL R AND OC JUMPER
4 Measure return air temperature. Mark that point on the top line of chart 1 and label the point B" (74_F, 23_C shown). 5 Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C" (70_F, 21_C shown). 6 Draw a straight line between points A and B. 7 Draw a vertical line through point C. 8 Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 9 If fresh air percentage is less than desired, adjust MIN POS SET potentiometer clockwise (further open). If fresh air percentage is more than desired, adjust MIN POS SET potentiometer counterclockwise (less open). Repeat steps 3 through 8 until calculation reads desired fresh air percentage. DCV Set and Max Settings The DCV SET potentiometer is factoryset at approximately 50% of the potentiometer range. Using a standard 12000ppm CO2 sensor, dampers will start to open when the IAQ sensor reads approximately 1000ppm. Adjust the DCV SET potentiometer to the approximate setting specified by the controls contractor. Refer to figure 20. The DCV MAX potentiometer is factoryset at approximately 50% of the potentiometer range or 6VDC. Dampers will open approximately half way when CO2 rises above setpoint. Adjust the DCV MAX potentiometer to the approximate setting specified by the controls contractor. Refer to figure 20. Note DCV Max must be set higher than economizer minimum position setting for proper demand control ventilation. Economizer Operation
FIGURE 21 1 Set thermostat to occupied mode if the feature is available. Make sure jumper is in place between TB1 terminals R and OC if using a thermostat which does not have the feature. 2 Rotate MIN POS SET potentiometer to approximate desired fresh air percentage. Note Damper minimum position can be set lower than traditional minimum air requirements when an IAQ sensor is specified. 3 Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A" (40_F, 4_C shown).
When the outdoor air is suitable, dampers will modulate between minimum position and full open to maintain 55_F (12.8_C) supply air. See table 9 for economizer operation when outdoor air is suitable. See table 10 for economizer operation when outdoor air is NOT suitable. IAQ Sensor During the occupied period, dampers will open to DCV MAX when IAQ reading is above setpoint (regardless of thermostat demand or outdoor air suitability). DCV MAX will NOT override damper fullopen position. The DCV MAX setting may override damper free cooling position when occupancy is high and outdoor air temperatures are low. Note R1 senses mixed air temperature below 45_F (7_C), dampers will move to minimum position until mixed air temperature rises to 48_F (9_C).
CHART 1 CALCULATE MINIMUM FRESH AIR PERCENTAGE
MIXED AND RETURN AIR TEMPERATURE
_F _C 20 29 10 23 0 18 10 12 20 7 30 1 40 4 50 10 60 16 70 21 80 27 90 32 100 _F 38 _C
_F 20 _C 29 10 23 0 18 10 12 20 7 30 1
40 4 50 10 60 16 70 21 80 27 90 32
100 _F 38 _C
THERMOSTAT DEMAND Off G Y1 Y2 DAMPER POSITION UNOCCUPIED OCCUPIED Closed Closed Closed Minimum MECHANICAL COOLING No No No Modulating Modulating Modulating Modulating Stage 1
TABLE 9 ECONOMIZER OPERATIONOUTDOOR AIR IS SUITABLE FOR FREE COOLING FREE COOL LED ON"
TABLE 10 ECONOMIZER OPERATIONOUTDOOR AIR IS NOT SUITABLE FOR FREE COOLING FREE COOL LED OFF"
THERMOSTAT DEMAND Off G Y1 Y2 DAMPER POSITION UNOCCUPIED Closed Closed Closed Closed OCCUPIED Closed Minimum* Minimum* Minimum* MECHANICAL COOLING No No
*IAQ sensor can open damper to DCV max.
BOutdoor Air Dampers Outdoor air dampers used on KCA units consists of a set of dampers which may be manually or motor (M) operated to allow outside air into the system (see figure 22). Either air damper can be installed in KCA units. The motorized damper assembly opens to minimum position during the occupied time period and remains closed during the unoccupied period. Manual damper assembly is set at installation and remains in that position. See figure 23. Washable filter supplied with the outdoor air dampers can be cleaned with wa-
ter and a mild detergent. It should be sprayed with Filter Handicoater when dry prior to reinstallation. Filter Handicoater is R.P. Products coating no. 418 and is available as Lennox Part No. P85069. Optional manual and motorized outdoor air dampers provide fresh outdoor air. Follow the steps to determine fresh air percentage
1 Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A" (40_F, 4_C shown). 2 Measure return air temperature. Mark that point on the top line of chart 1 and label the point B" (74_F, 23_C shown). 3 Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C" (70_F, 21_C shown). 4 Draw a straight line between points A and B. 5 Draw a vertical line through point C.
6 Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 7 If fresh air percentage is less than desired, adjust thumbwheel higher. If fresh air percentage is more than desired, adjust thumbwheel lower. Repeat steps until calculation reads desired fresh air percentage. See figure 24. Set damper minimum position in the same manner as economizer minimum position. Adjust motorized damper position using the thumbwheel on the damper motor. See figure 24. Manual damper fresh air intake percentage can be determined in the same manner.
DAMPER ASSEMBLY DAMPER MOTOR J3 UNIT JACK
P4 ECONOMIZER PLUG END PLATE
BOTTOM OF DAMPER ASSEMBLY DAMPER SUPPORT BRACKET
FIGURE 22 MANUAL OUTDOOR AIR DAMPER DAMPER MOTOR
LOOSEN WING NUT AND ADJUST LEVER TO DESIRED SETTING.
EGravity Exhaust Dampers
C1DAMP50 dampers (figure 25) available for KCA180/300 units, are used in downflow and LAGED(H)18/24 are used in horizontal air discharge applications. LAGED(H) gravity exhaust dampers are installed in the return air plenum . The dampers must be used any time an economizer or power exhaust fans are applied to KCA series units. Gravity exhaust dampers allow exhaust air to be discharged from the system when an economizer and/or power exhaust is operating. Gravity exhaust dampers also prevent outdoor air infiltration during unit off cycle. See installation instructions for more detail. C1DAMP50 AND C1PWRE10 INSTALLATION
ECONOMIZER FRESH AIR HOOD
FC1PWRE10C Power Exhaust Fans
C1PWRE10C available for KCA180/300 units are power exhaust fans used in downflow applications only. The fans require optional down-flow gravity exhaust dampers and K1ECON economizers. Power exhaust fans provide exhaust air pressure relief and also run when return air dampers are closed and supply air blowers are operating. Figure 25 shows the location of the C1PWRE. See installation instructions for more detail.
C1PWRE POWER EXHAUST FAN ASSEMBLY C1DAMP50 GRAVITY EXHAUST DAMPERS
IIndoor Air Quality (CO2) Sensor A63
The indoor air quality sensor monitors CO2 levels and reports the levels to the economizer control module A6. The board adjusts the economizer dampers according to the CO2 levels. The sensor is mounted next to the indoor thermostat or in the return air duct. Refer to the indoor air quality sensor installation instructions for proper adjustment.
GControl Systems
Three different types of control systems may be used with the KCA series units. All thermostat wiring is connected to terminal block TB1 located in the control box of the unit. Each thermostat has additional control options available. See thermostat installation instructions for more detail. 1 Electro-mechanical thermostat (13F06) The electro-mechanical thermostat is a twostage heat / twostage cool thermostat with dual temperature levers. A non-switching or manual system switch subbase may be used. 2 Electronic thermostat (see price book) Any twostage heat / twostage cool electronic thermostat may be used. 3 Honeywell T7300 thermostat (81G59) The Honeywell T7300 thermostat is a programmable, internal or optional remote temperature sensing thermostat. The T7300 provides occupied and unoccupied changeover control.
JUVC Kit
UVC germicidal lamps are a fieldinstalled option. The lamp emits ultraviolet light that greatly reduces the growth and proliferation of mold and other bioaerosols on illuminated surfaces. The lamp is mounted in the blower compartment with the light directed towards the indoor coil. For more details refer to the installation instructions provided with the UVC lamp.
KDrain Pan Overflow Switch S149 (optional)
The overflow switch is used to interrupt cooling operation when excessive condensate collects in the drain pan. The N.O. overflow switch is controlled by K220 and DL46 relays, located in the unit control panel. When the overflow switch closes, 24VAC power is interrupted and after a five second delay unit compressors are deenergized. Once the condensate level drops below the set level, the switch will open. After a fiveminute delay the compressor will be energized.
HSmoke Detectors A171 and A172
Photoelectric smoke detectors are a field installed option. The smoke detectors can be installed in the supply air section (A172), return air section (A171), or in both the supply and return air section.
T1 24V
24V L2 460V, 575V UNITS
TO N 380420V UNITS
TO L1 T1
ECONOMIZER BLOWER(G) HEAT 1(W1) HEAT 2(W2)
95 S42 96 K2201 2 7 S149 S50 7 7 K661 K671 4 4
COOL 1(Y1) COOL 2 (Y2)
2 3 K220 6 3 A K2 B
NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUSTBE REPLACED WITH WIRE OFLIKE SIZE, RATING, TERMINATION AND INSULATION THICKNESS
DL46 5
1 A 4 5 A K66 B B A A K67 B A B A B
VIIIWiring Diagrams and Sequence of Operation
KCA180 UNIT DIAGRAM
J138 P138
A171 A172 A173 B1 B2 B3 B4 B5 B10 B11
SENSOR ONE, SMOKE, RETURN AIR SENSOR TWO, SMOKE, SUPPLY AIR MODULE, CONTROL SMOKE DETECTION COMPRESSOR 1 COMPRESSOR 2 MOTOR, BLOWER MOTOR, OUTDOOR FAN 1 MOTOR, OUTDOOR FAN 2 MOTOR, EXHAUST FAN 1 MOTOR, EXHAUST FAN 2
K66,1 RELAY, STAGE COOL 1 K67,1 RELAY, STAGE COOL 2 K220, 1RELAY, OVERFLOW SWITCH JACK, HEAT P2 JACK, EXHAUST FAN COMPT P18 JACK, EXHAUST FAN P24 PLUG, TEST P35 PLUG, TEST COOL P36 JACK, OUTDOOR FAN 1 P47 JACK, OUTDOOR FAN 2 P52 PLUG, SENSE BLOWER P86 P106 JACK, OUTDOOR FAN 3
S48 5
PLUG, EXHAUST FAN MOTOR 1 PLUG, EXHAUST FAN MOTOR 2 JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR TWO JACK, SMOKE DETECTOR TWO PLUG, MODULE, CONTROL SMOKE DETECTION SWITCH, LIMIT LOW COMPRESSOR 1 TEMP SWITCH, LIMIT HI PRESS COMP 1 ( MANUAL RESET) SWITCH, LIMIT HI PRESS COMP 2 SWITCH, LOW PRESS, LOW AMBIENT KIT SWITCH, LIMIT LOW COMPRESSOR 2 TEMP SWITCH, OVERLOAD RELAY BLOWER MOTOR SWITCH, DISCONNECT SWITCH, FREEZESTAT COMP 1 SWITCH, FREEZESTAT COMP 2 SWITCH, LOW PRESS, LOW AMBIENT KIT COMP 2 SWITCH, OVERFLOW TRANSFORMER, CONTROL TERMINAL STRIP, POWER DISTRIBUTION
H 120/ 60/ 1 N
MOTOR, OUTDOOR FAN 3 B21 P132 CAPACITOR, OUTDOOR FAN 1 C1 P133 CAPACITOR, OUTDOOR FAN 2 C2 WARNING ELECTRIC SHOCK HAZARD, CAN CAUSE DEATH INJURY OR P250 CAPACITOR, EXHAUST FAN C6 UNITMUST BEGROUNDED IN ACCORDANCE WITHNATIONAL AND LOCAL CODES P251 CAPACITOR, OUTDOOR FAN 3 C18 P252 CIRCUIT, BREAKER T1 CB8 DISCONNECT ALL POWER BEFORE SERVICING. P253 CB10 CIRCUIT, BREAKER MAIN DISCONNECT P255 DL46 DELAY, OVERFLOW SWITCH S3 HR1 HEATER COMPRESSOR 1 S4 C18 HEATER COMPRESSOR 2 HR2 C2 C1 9 7 1 7 9 S7 JACK, HEAT J2 S11 JACK, GFI, RECEPTICLE J11 6 4 4 6 S30 JACK, EXHAUST FAN COMPT J18 P24 1 J24 2 P36 S42 JACK, EXHAUST FAN J24 2 3 J36 1 S48 JACK, TEST J35 1 J18 2 P18 S49 JACK, TEST COOL J86 1 2 3 2 7 8 9 2 J36 4 5 6 B2 S50 P86 JACK, OUTDOOR FAN 1 1 1 J47 B3 J47 3 2 1 J52 3 2 1 J1063 2 1 HR2 S84 HR1 JACK, OUTDOOR FAN 2 J52 P47 P106 P52 S149 JACK, SENSE BLOWER J86 C8 T1 J106 JACK, OUTDOOR FAN 3 3 2 1 TB13 J132 JACK, BLOWER , EXHAUST FAN MOTOR 1 J133 3 2 1 J133 JACK, BLOWER , EXHAUST FAN MOTOR 2 P133 B21 J250 JACK, SMOKE DETECTOR ONE B5 J251 JACK, SMOKE DETECTOR ONE B11 J252 JACK, SMOKE DETECTOR TWO J253 JACK, SMOKE DETECTOR TWO J255 JACK, MODULE, CONTROL SMOKE DETECTION S42USED ON"M"VOLTAGE UNITS AND UNITS J261 JACK, SMOKE DETECTOR JUMPER WITH HIGH EFFICIENCY MOTORS CONNECT A172 SENSOR TO J261 ON SUPPLY AIR K1,1 CONTACTOR, COMPRESSOR 1 P2 IS USED ON KCA UNITS ONLY K2,1 CONTACTOR, COMPRESSOR 2 SMOKE DETECTOR ONLY K3, 1 CONTACTOR, BLOWER IMPORTANT: TO PREVENT MOTOR BURNOUT, NEVER S48 OR CB10 MAY BE USED CONNECT MORE THAN ONE MOTOR LEAD TOANY ONE K10,1,2RELAY, OUTDOOR FAN CONNECTION. TAPE UNUSED MOTOR LEADS K651,2 RELAY, EXHAUST FAN 1
REV. 3.0 Lennox Commercial
KCA180 SEQUENCE OF OPERATION
Power: 1. Line voltage from unit disconnect S48 or TB13 energizes transformer T1. T1 provides 24VAC to the unit cooling, heating and blower controls and TB1. Blower Operation: 2. TB1 receives a demand from thermostat terminal and energizes blower contactor K3 24VAC. 3. N.O. K3 closes, energizing blower B3. Optional Power Exhaust Operation: 4. The economizer control module receives a demand and energizes exhaust fan relay K65 with 24VAC at 50% outside air damper open (adjustable). 5. N.O. K651 and N.O. K652 both close, energizing exhaust fan motors B10 and B11. 1st Stage Cooling (compressor B1) 6. Y1 energizes the pilot relay K66 and N.O. K661 closes. 7. 24VAC is routed from T1 through N.C. freezestat S49 and N.C. high pressure switch S4 to energize compressor contactor K1. 8. N.O. contacts K1 close energizing compressor B1. 9. Optional N.O. low ambient switch S11 and/or S84 closes to energize condenser fan relay K10. 10. N.O. contacts K101 and K102 close energizing condenser fan B4, B5 and B21. 2nd Stage Cooling (compressor B2 is energized) 11. Y2 energizes the pilot relay K67 and N.O. K671 closes. 12. 24VAC is routed from T1 through N.C. freezestat S50 and N.C. high pressure switch S7 to energize compressor contactor K2. 13. N.O. K2 closes energizing compressor B2.
TO L1 T18 T1 T18 T1 BLACK 24V TO N 380420V UNITS A171 A172 A173 24V B1 B2 B3 B4 460V, 575V B5 UNITS B10 B11
JACK, MODULE, CONTROL SMOKE DETECTION
J138 J139 J250 J251 J252 J253 J255 J261 K1,1 K2,1 K3, 1 K10,1,2 JACK, SMOKE DETECTOR JUMPER CONTACTOR, COMPRESSOR 1 CONTACTOR, COMPRESSOR 2 CONTACTOR, BLOWER RELAY, OUTDOOR FAN ECONOMIZER
BLOWER(G) HEAT 1(W1) HEAT 2(W2)
JACK, JACK, JACK, JACK, JACK, JACK,
EXHAUST FAN 2 EXHAUST FAN 3 SMOKE DETECTOR ONE SMOKE DETECTOR ONE SMOKE DETECTOR TWO SMOKE DETECTOR TWO
95 S42 96 7 K671 4 7 K661 4 2 S50 CB18 S28 T18 S7 S53
1 P35 J35 6 7 A A K2 B B B A K14 B A A K66 B A K67 B 3 4 5 A B GND
NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OFLIKE SIZE, RATING, TERMINATION AND INSULATION THICKNESS WARNING ELECTRIC SHOCK HAZARD, CAN DEATH CAUSE INJURY OR UNITMUST BEGROUNDED IN ACCORDANCE WITHNATIONAL AND LOCAL CODES DISCONNECT ALL POWER BEFORE SERVICING.
KCA210 UNIT DIAGRAM
4 6 2 3 P36 J36 1
P24 1 J24 2 1 J18 2 P18
B2 B13 HR5 B3 HR1 HR2
2 1 C8 3 2 1 J133 3 2 P133 1
1 9 4 7 C1 C2 C18 7 9 6 HR5 J2 J11 J18 J24 J35 J36 J47 J52 J86 J106 J132 J133 2 1 J86 1 2 3 7 8 9 4 5 6 P86 J47 3 2 1 J52 3 2 1 J1063 2 1 P47 P106 P52 B5 B21 B11
S42USED ON"M"VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS CONNECT A172 SENSOR TO J261 ON SUPPLY AIR SMOKE DETECTOR ONLY S48 OR CB10 MAY BE USED P2 IS USED ON KCA UNITS ONLY IMPORTANT: TO PREVENT MOTOR BURNOUT, NEVER CONNECT MORE THAN ONE MOTOR LEAD TOANY ONE CONNECTION. TAPE UNUSED MOTOR LEADS
B13 B21 C1 C2 C6 C18 CB8 CB10 CB18 DL46 HR1 HR2
COMPRESSOR 3 MOTOR, OUTDOOR FAN 3 CAPACITOR, OUTDOOR FAN 1 CAPACITOR, OUTDOOR FAN 2 CAPACITOR, EXHAUST FAN CAPACITOR, OUTDOOR FAN 3 CIRCUIT, BREAKER T1 CIRCUIT, BREAKER MAIN DISCONNECT CIRCUIT, BREAKER T18 DELAY, OVERFLOW SWITCH HEATER, COMPRESSOR 1 HEATER, COMPRESSOR 2
K14, 1 K651,2 K66,1 K67,1 K220, 1 P2 P18 P24 P35 P36 P47 P52
CONTACTOR, COMPRESSOR 3 RELAY, EXHAUST FAN 1 RELAY, STAGE COOL 1 RELAY, STAGE COOL 2 RELAY, OVERFLOW SWITCH JACK, HEAT JACK, EXHAUST FAN COMPT JACK, EXHAUST FAN PLUG, TEST PLUG, TEST COOL JACK, OUTDOOR FAN 1 JACK, OUTDOOR FAN 2
24V COMMON PLUG, SENSE BLOWER JACK, OUTDOOR FAN 3 PLUG, EXHAUST FAN MOTOR 1 PLUG, EXHAUST FAN MOTOR 2 PLUG, EXHAUST FAN 1 JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR TWO JACK, SMOKE DETECTOR TWO
PLUG, MODULE, CONTROL SMOKE DETECTION
SWITCH, LIMIT LOW COMPRESSOR 1 TEMP
SWITCH, LIMIT HI PRESS COMP 1 ( MANUAL RESET)
HEATER, COMPRESSOR 3 JACK, HEAT JACK, GFI, RECEPTICLE JACK, EXHAUST FAN COMPT JACK, EXHAUST FAN JACK, TEST JACK, TEST COOL JACK, OUTDOOR FAN 1 JACK, OUTDOOR FAN 2 JACK, SENSE BLOWER JACK, OUTDOOR FAN 3 JACK, BLOWER , EXHAUST FAN MOTOR 1 JACK, BLOWER , EXHAUST FAN MOTOR 2
SWITCH, SWITCH, SWITCH, SWITCH, SWITCH, SWITCH, SWITCH,
LIMIT HI PRESS COMP 2 LOW PRESS, LOW AMBIENT KIT LIMIT LOW COMPRESSOR 2 TEMP OVERLOAD RELAY BLOWER MOTOR DISCONNECT FREEZESTAT COMP 1 FREEZESTAT COMP 2
SWITCH, LOW PRESS, LOW AMBIENT KIT COMP 2
P86 P106 P132 P133 P138 P250 P251 P252 P253 P255 S3 S4 S7 S11 S30 S42 S48 S49 S50 S84 S149 T1 TB13
SWITCH, OVERFLOW TRANSFORMER, CONTROL TERMINAL STRIP, POWER DISTRIBUTION
KCA210 SEQUENCE OF OPERATION
Power: 1. Line voltage from unit disconnect S48 or TB13 energizes transformer T1 and T18. T1 and T18 provide 24VAC to the unit cooling, heating and blower controls and TB1. Blower Operation: 2. TB1 receives a demand from thermostat terminal G and energizes blower contactor K3 with 24VAC. 3. N.O. K3 closes, energizing blower B3. Optional Power Exhaust Operation: 4. The economizer control module receives a demand and energizes exhaust fan relay K65 with 24VAC at 50% outside air damper open (adjustable). 5. N.O. K651 and N.O. K652 both close, energizing exhaust fan motors B10 and B11. 1st Stage Cooling (compressor B1 and B2) 6. Y1 energizes the pilot relay K66 and N.O. K661 closes. 7. 24VAC is routed from T1 to N.C. freezestats S49 and S50 and N.C. high pressure switch S4 and S7. Compressor contactors K1 and K2 are energized. 8. N.O. contacts K1 and K2 close energizing compressors B1 and B2. 9. Optional N.O. low ambient switch S11 and/or S84 and/or S85 closes to energize condenser fan relay K10. 10. N.O. contacts K101 and K102 close energizing condenser fan B4, B5 and B21. 2nd Stage Cooling (compressor B13 is energized) 11. Y2 energizes the pilot relay K67 and N.O. K671 closes. 12. 24VAC is routed from T18 to N.C. freezestat S53 and N.C. high pressure switch S28. Compressor contactor K14 is energized. 13. N.O. K14 closes energizing compressor B13.
J252 J253 J255 J261 K1,1 K2,1 K3, 1 K10,1,2 K14, 1 K651,2 K66,1 K67,1 RELAY, STAGE COOL 2
JACK, SMOKE DETECTOR TWO JACK, SMOKE DETECTOR TWO JACK, MODULE, CONTROL SMOKE DETECTION JACK, SMOKE DETECTOR JUMPER CONTACTOR, COMPRESSOR 1 CONTACTOR, COMPRESSOR 2 CONTACTOR, BLOWER RELAY, OUTDOOR FAN CONTACTOR, COMPRESSOR 3 RELAY, EXHAUST FAN 1 RELAY, STAGE COOL 1
TO L1 L1 A172 A173 B1 B2 TO N 380420V UNITS B5 B10 B11 MOTOR, EXHAUST FAN 2 MOTOR, EXHAUST FAN 1 MOTOR, OUTDOOR FAN 2 L2 460V, 575V UNITS B4 MOTOR, OUTDOOR FAN 1 B3 MOTOR, BLOWER COMPRESSOR 2 COMPRESSOR 1 MODULE, CONTROL SMOKE DETECTION SENSOR TWO, SMOKE, SUPPLY AIR A171 SENSOR ONE, SMOKE, RETURN AIR
95 7 B21 7 K661 4 C2 CAPACITOR, OUTDOOR FAN 2 C1 CAPACITOR, OUTDOOR FAN 1 P18 B22 MOTOR, OUTDOOR FAN 4 P2 K671 4 MOTOR, OUTDOOR FAN 3 K220, 1
K149,1
RELAY, OUTDOOR FAN 3 RELAY, OVERFLOW SWITCH JACK, HEAT JACK, EXHAUST FAN
7 2 S53 S50 C8 C18 T18 S28 CB8 CB10 6 DL46 A A K67 F10 HR1 HR2 HR5 J2 J11 J18 J24 J35 F6 J36 J47 J52 1 7 9 K1491 6 2 2 3 J87 2 1 1 2 3 J107 P107 1 3 2 P52 J52 6 4 5 P87 3 4 4 3 5 2 6 1 C8 3 2 1 3 B21 B22 B11 J107
S42 USED ON M VOLTAGE UNITS AND UNITS WITH HIGH EFFICIENCY MOTORS CONNECT A172 SENSOR TO J261 ON SUPPLY AIR SMOKE DETECTOR ONLY S48 OR CB10 MAY BE USED
S149 C6 CAPACITOR, EXHAUST FAN 2 CAPACITOR, OUTDOOR FAN 3 CAPACITOR, OUTDOOR FAN 4 CIRCUIT, BREAKER T1 CIRCUIT, BREAKER MAIN DISCONNECT CIRCUIT, BREAKER T18 DELAY, OVERFLOW SWITCH FUSE, EXHAUST FAN FUSE, OUTDOOR FAN MOTOR HEATER, COMPRESSOR 1 HEATER, COMPRESSOR 2 HEATER, COMPRESSOR 3 JACK, HEAT JACK, GFI, RECEPTICLE JACK, EXHAUST FAN COMPT JACK, EXHAUST FAN JACK, TEST JACK, TEST COOL JACK, OUTDOOR FAN 1 JACK, OUTDOOR FAN 2 9 7 4 6 P24 1 J24 1 J18 P18 6 2 J138 P138 J139 2 J86 J87 J106 JACK, OUTDOOR FANS 1 JACK, OUTDOOR FANS 2 JACK, OUTDOOR FAN 3 CAPACITOR, EXHAUST FAN 1
P35 J35
P24 P35 P36 P47 P52 P86 P87 P106 P107 P132 P133 P138 P250 P251 P252 P253 P255 S3 S4 S7 S11 S28 S30 S42 S48 S49 S50
JACK, EXHAUST FAN PLUG, TEST PLUG, TEST COOL JACK, OUTDOOR FAN 1 JACK, OUTDOOR FAN 2 PLUG, OUTDOOR FANS 1 PLUG, OUTDOOR FANS 2 JACK, OUTDOOR FAN 3 JACK, OUTDOOR FAN 4 PLUG, EXHAUST FAN MOTOR 1 PLUG, EXHAUST FAN MOTOR 2 PLUG, EXHAUST FAN 1 JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR TWO JACK, SMOKE DETECTOR TWO PLUG, MODULE, CONTROL SMOKE DETECTION SWITCH, LIMIT LOW COMPRESSOR 1 TEMP SWITCH, LIMIT HI PRESS COMP 1 ( MANUAL RESET) SWITCH, LIMIT HI PRESS COMP 2 SWITCH, LOW PRESS, LOW AMBIENT KIT SWITCH, LIMIT HI PRESS COMP 3 SWITCH, LIMIT LOW COMPRESSOR 2 TEMP SWITCH, OVERLOAD RELAY BLOWER MOTOR SWITCH, DISCONNECT SWITCH, FREEZESTAT COMP 1 SWITCH, FREEZESTAT COMP 2
DL46 S7 C19
3 CB18 F6
B A K2 K3 K10 K149 K14 K1 B B B B B B B B K66 A A A A A
A P35 J35 8 7 3 5 4
KCA240 & 300 UNIT DIAGRAM
4 P36 J36 1 1 J86
NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING, TERMINATION AND INSULATION THICKNESS WARNING ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES DISCONNECT ALL POWER BEFORE SERVICING. F10
N 7 9
S48 C1 C2 C18
B2 HR1 P47 HR2 3 2 HR5 J47 1 J106 3 P106
S53 S84 S85 S149 T1 J133 P133 2 1 T18 TB13
SWITCH, FREEZESTAT COMP 3 SWITCH, LOW PRESS, LOW AMBIENT KIT COMP 2 SWITCH, LOW PRESS, LOW AMBIENT KIT COMP 3 SWITCH, OVERFLOW TRANSFORMER, CONTROL TRANSFORMER, CONTACTOR CONTROL TERMINAL STRIP, POWER DISTRIBUTION
DENOTES OPTIONAL COMPONENTS LINE VOLTAGE FIELD INSTALLED
J11 JACK, OUTDOOR FAN 4 J132 J133 J138 J139 J250 F6 AND F10 ARE USED ON Y VOLTAGE UNITS ONLY J251 JACK, BLOWER , EXHAUST FAN MOTOR 1 JACK, BLOWER , EXHAUST FAN MOTOR 2 JACK, EXHAUST FAN 2 JACK, EXHAUST FAN 3 JACK, SMOKE DETECTOR ONE JACK, SMOKE DETECTOR ONE
120/ 60/ 1
P2 IS USED ON KCA UNITS ONLY
IMPORTANT: TO PREVENT MOTOR BURNOUT, NEVER CONNECT MORE THAN ONE MOTOR LEAD TO ANY ONE CONNECTION. TAPE UNUSED MOTOR LEADS
KCA240, 300 SEQUENCE OF OPERATION
Power: 1. Line voltage from unit disconnect S48 or TB13, energizes transformer T1 and T18. T1 and T18 provide 24VAC to the unit cooling, heating and blower controls and TB1. Blower Operation: 2. TB1 receives a demand from thermostat terminal G and energizes blower contactor K3 with 24VAC. 3. N.O. K3 closes, energizing blower B3. Optional Power Exhaust Operation: 4. The economizer control module receives a demand and energizes exhaust fan relay K65 with 24VAC at 50% outside air damper open (adjustable). 5. N.O. K651 and N.O. K652 both close, energizing exhaust fan motors B10 and B11. 1st Stage Cooling (compressor B1 and B2) 6. Y1 energizes the pilot relay K66 and N.O. K661 closes. 7. 24VAC is routed from T1 to N.C. freezestats S49 and S50 and N.C. high pressure switches S4 and S7. Compressor contactor K1 and K2 is energized. 8. N.O. contacts K1 and K2 closes energizing compressor B1 and B2. 9. Optional N.O. low ambient switch S11 closes to energize condenser fan relay K10. 10. N.O. contacts K101 and K102 close energizing condenser fan B4 and B5. 11. Optional N.O. low ambient switch S84 and/or S85 close to energize condenser fan relay K149. 12. N.O. contacts K1491 and K1492 close energizing condenser fan B21 and B22. 2nd Stage Cooling (compressor B13 is energized) 13. Y2 energizes the pilot relay K67 and N.O. K671 closes. 14. 24VAC is routed from T18 to N.C. freezestat S53 and N.C. high pressure switch S28. Compressor contactor K14 is energized. 15. N.O. K14 closes energizing compressor B13.
EHA15, 30, 45, 60, 90kW Y VOLTAGE
DESCRIPTION KEY CB13 DL2 DL5 F3 F4 F42 F43 F44 F45 F46 F51 HE1 HE2 HE3 HE4 HE5 HE6 HE7 HE8 HE9 HE10 HE11 HE12 J7 J37 K9,1,2 K15,1 K16, 1 K17, 1 K18, 1 K19, 1 COMPONENT CIRCUIT, BREAKER TRNAS T2 DELAY, ELECTRIC HEAT DELAY, ELECTRIC HEAT FUSE, ELECTRIC HEAT FUSE, UNIT FUSE, ELECTRIC HEAT FUSE, ELECTRIC HEAT FUSE, ELECTRIC HEAT FUSE, ELECTRIC HEAT FUSE, ELECTRIC HEAT FUSE, ELECTRIC HEAT ELEMENT, ELECTRIC HEAT 1 ELEMENT, ELECTRIC HEAT 2 ELEMENT, ELECTRIC HEAT 3 ELEMENT, ELECTRIC HEAT 4 ELEMENT, ELECTRIC HEAT 5 P2 P7 P37 S15 S20 S107 S157 S158 S159 S160 S161 T2 TB2 TB3 TB13 PLUG, HEAT PLUG, ELECTRIC HEAT BUB BASE KIT PLUG, ELECTRIC HEAT LIMIT SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT TRANSFORMER, ELECTRIC HEAT TERMINAL STRIP, UNIT 2 TERMINAL STRIP, ELECTRIC HEAT TERMINAL STRIP, POWER DISTRIBUTION
ELEMENT, ELECTRIC HEAT 6 ELEMENT, ELECTRIC HEAT 7 ELEMENT, ELECTRIC HEAT 8 ELEMENT, ELECTRIC HEAT 9 ELEMENT, ELECTRIC HEAT 10 ELEMENT, ELECTRIC HEAT 11 ELEMENT, ELECTRIC HEAT 12 JACK, ELECTRIC HEAT SUBBASE KIT JACK, ELECTRIC HEAT LIMIT RELAY, HEAT CONTACTOR, ELECTRIC HEAT 1 CONTACTOR, ELECTRIC HEAT 2 CONTACTOR, ELECTRIC HEAT 3 CONTACTOR, ELECTRIC HEAT 4 RELAY, STAGE TWO HEAT
S158 S160 S160
KW 15 30 45 60 90
HE1 HE2 HE3 7.5 7.5 15 15 15 15
HE4 15
HE5 15
HE10 HE11 HE12
7.5 15 15 15 15 15
EHA15, 30, 45, 60, 90kW G, J, M VOLTAGE
DESCRIPTION KEY CB13 DL2 DL5 F3 F4 F43 F44 F45 HE1 HE1A HE2A HE3 HE4 HE5 HE6 HE7 J7 J37 K9,1,2 K15,1 K16, 1 K17, 1 K18, 1 K19, 1 P2 P7 P37 S15 S20 S107 S157 S158 S159 S160 COMPONENT CIRCUIT, BREAKER TRNAS T2 DELAY, ELECTRIC HEAT DELAY, ELECTRIC HEAT FUSE, ELECTRIC HEAT 1, 1A, 2A FUSE, UNIT FUSE, ELECTRIC HEAT 3, 4 FUSE, ELECTRIC HEAT 5 FUSE, ELECTRIC HEAT 6, 7 ELEMENT, ELECTRIC HEAT 1 ELEMENT, ELECTRIC HEAT 1A ELEMENT, ELECTRIC HEAT 2 ELEMENT, ELECTRIC HEAT 3 ELEMENT, ELECTRIC HEAT 4 ELEMENT, ELECTRIC HEAT 5 ELEMENT, ELECTRIC HEAT 6 ELEMENT, ELECTRIC HEAT 7 JACK, ELECTRIC HEAT SUBBASE KIT JACK, ELECTRIC HEAT LIMIT RELAY, HEAT CONTACTOR, ELECTRIC HEAT 1 CONTACTOR, ELECTRIC HEAT 2 CONTACTOR, ELECTRIC HEAT 3 CONTACTOR, ELECTRIC HEAT 4 RELAY, STAGE TWO HEAT PLUG, HEAT PLUG, ELECTRIC HEAT BUB BASE KIT PLUG, ELECTRIC HEAT LIMIT SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT 1A SWITCH, LIMIT PRIMARY ELECTRIC HEAT SWITCH, LIMIT SECONDARY ELECTRIC HEAT 2A SWITCH, LIMIT SECONDARY ELECTRIC HEAT 3,4 SWITCH, LIMIT SECONDARY ELECTRIC HEAT 5 SWITCH, LIMIT SECONDARY ELECTRIC HEAT 6,7 T2 TB 2 TB 3 TB15 TRANSFORMER, ELECTRIC HEAT TERMINAL STRIP, UNIT 2 TERMINAL STRIP, ELECTRIC HEAT TERMINAL STRIP, UNIT 2
A B K9
HE1A 7.5 15
HE2A 7.5 15
REV. 0.0
Sequence of Operation EHA15 ,30, 45, 60, 90kW Y, G, J and M
NOTE: This sequence of operation is for all Electric Heat kW ratings Y, G, J and M voltages. HEATING ELEMENTS: 1 Terminal Strip TB2 supplies power to TB3. TB3 supplies line voltage to electric heat elements HE1 through HE14. Each element is protected by fuse F3. FIRST STAGE HEAT: Heating demand initiates at W1 in thermostat. 1 TB1 receives W1 demand and energizes relay K9. N.O. K91 closes which allows 24VAC from TB1 to energize blower contactor K3. 2 24VAC is routed from T2, proving N.C. primary limits S15 (first heat section) and S107 (second heat section). Voltage then energizes contactors K15 and K17. 3 N.O. contact K151 closes allowing the first bank of elements to be energized. N.O. K171 closes allowing the second bank of elements to be energized. SECOND STAGE HEAT: With the first stage heat operating, an additional heating demand initiates at W2 in the thermostat. 4 Relay K19 is energized. N.O. contacts K191 close energizing timer DL2. 5 After a 30 second delay, DL2 closes energizing contactor K16 and timer DL5. 6 N.O. contacts K161 close allowing the third bank of elements to be energized. 7 After a 30 second delay, DL5 closes energizing contactor K18. K181 closes allowing the fourth bank of elements to be energized. END OF SECOND STAGE HEAT: Heating demand is satisfied. Terminal W2 in the thermostat is deenergized. 8 Electric heat contactors K16 and K18 are deenergized. 9 The fourth and third set of elements are deenergized. END OF FIRST STAGE HEAT: Heating demand is satisfied. Terminal W1 in the thermostat is deenergized. 10 Electric heat contactors K15 and K17 are deenergized. 11 The second and first set of electric heat elements are deenergized.
ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
COOL 1(Y1) COOL 2(Y2)
A B k65
24V COMMON 24V POWER COOL 1 (Y1)
KEY A2 A63 CMC3 J3 K65 P3 R1 RT2 TB1
DESCRIPTION COMPONENT SENSOR, ELECTRONIC THERMOSTAT SENSOR, CO2 CLOCK, TIME JACK, UNIT ECONOMIZER RELAY, EXHAUST FAN PLUG, ECONOMIZER BYPASS SENSOR, MIXED AIR OR SUPPLY AIR SENSOR, REMOTE THERMOSTAT TERMINAL STRIP, CLASS II VOLTAGE
COOL 2 (Y2)
24V COMMON REMOVEP3 WHEN ECONOMIZERIS USED, ONLY ON KCA, KGA AND KHA 180 THROUGH 300 UNITS.
CONNECTION SCHEME FOR KCA, KGA AND KHA 092 THROUGH 150 UNITS WITHOUT ECONOMIZER ONLY
POWER: 1. Terminal strip TB1 found on the control panel energizes thermostat components with 24VAC. OPERATION: 2. TB1 receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G, OCP) TB1 energizes the appropriate components for heat or cool demand. Page 45
KCA ECONOMIZER
POWER: 1. 2. 3. 4. Economizer control module A6 is energized through P4 when contactor K3 is energized. Temperature sensor S175 or enthalpy sensor A7 and A62 (if differential enthalpy is used) communicates to the economizer control module A6 when to power the damper motor B7. Economizer control module A6 supplies B7 with 0 10 VDC to control the positioning of economizer. The damper actuator provides 2 to 10 VDC position feedback. OPERATION:
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