# , 

# <r:-' ·_· · . . 

# 1986 :t-.

....

# D AMERICAN NAn .., 

# OBSOLETE 

# STANDARD 

# for

,liP;

...1 • AIR-CONDITIONING 

## &REFRIGERATION INSTITUTE 

## ANSIIARI 340-86



# COMMERCIAL AND

.. INDUSTRIAL UNITARY HEAT

.. 

# PUMP EQUIPMENT



# I Standard 340 

# I

1501 WILSON BOULEVARD. ARLINGTON, VIRGINIA 22209

...

# ------. ,..- ..

# OBSOLETE

TABLE OF CONTENTS PART PAGE Section 1. Purpose Section 2. Scope

................................................................................ . Section 3. Definitions

........................................................................... . Section 4. Classification

.......................................................................... 2 Section 5. Testing and Rating Requirements

........................................................ 2 Section 6. Performance Requirements

.............................................................. 6 Section 7. Safety Recommendations

................................................. :.............. 7 Section 8. Conformance

......................................................... . ........."

.. .".... 7 

# . : ' Appendix A. Method and Example ofCalculating IPL V

............ . ............................................ 8

# , ________________________ ARI STAN DAR 0 340-86 

# COMMERCIAL AND INDUSTRIAL UNITARY HEAT PUMP EQUIPMENT

Section 1. Purpose 

### 1.1 Purpose. The purpose of this standard is to establish, for commercial and industrial unitary heat pump equipment: definitions and classification; requirements for testing and rting; specifications, literature and advertising requirements; performance requirements; safety recommendations; and conformance conditions. 1.1.1 This standard is intendedfor the guidance of the industry, including manufacturers, distributors, consultants, and consumers. 

### 1.2 ReviewandAmendment. This standard is subject to review and amendment as the art of the industry advances. Section 2. Scope 

### 2.1 Scope. This standard applies to factory-made airsource commercial and industrial unitary heat pumps, as defined in 3.1. 

### 2.1.1 Energy Source. This standard applies only to electrically-driven, mechanical compression type systems. 

### 2.2 Exclusions. This standard does not apply to the rating and testing of individual assemblies for separate use, nor to unitary heat pumps as defined in ARI Standard 240 with capacities less than 135 MBh [40 kW). or water-source heat pumps as defined in ARI Standard 320.

-Section 3. Definitions 

### 3.1 Commercial andIndustrial Unitary Heat Pump. A commercial and industrial unitary heat pump consists of one or more factory-made assemblies which normally include an indoor conditioning coil, compressor(s) and refrigerant-to-air heat exchanger, including means to provide a heatingfunction and mayormay notinclude a cooling function. When such equipment is provided in more than one assembly, the separated assemblies should be designed to be used together, and the requirements ofrating outlined in the standard are based upon the use of matched assemblies. 

### 3.1.1 Functions. Commercial and industrial unitary heat pumps shall provide the function of heating with controlled temperature, and may include the functions of air-cooling, air-circulating, air-cleaning. dehumidifying or humidifying. 

### 3.2 Published Rating. A statement of the assigned values of those performance characteristics, under stated rating conditions. by which a unit may be chosen tofit its application.Thesevaluesapply to all unitsoflike nominal size and type (identification) produced by the same manufacturer.Asused herein, theterm "published rating" includes the rating of all performance characteristics shown on the heat pump orpublished in specifications, advertising. orotherliterature controlled by the manufacturer, at stated rating conditions. 

### 3.2.1 StandardRating. A rating based on tests performed at Standard Rating Conditions. 

### 3.2.2 Application Rating. A rating based on tests performed at application rating conditions (other than Standard Rating Conditions). 

### 3.3 Rating Conditions. Any set ofoperating conditions under which a single level of performance

- results, and which causes only that level ofperformance to occur. 

### 3.3.1 Standard Rating Conditions. Rating conditions used as the basis of comparison of performance characteristics. 

### 3.4 Energy Efficiency Ratio (EER). A ratio calculated by dividing the cooling capacity in MBh by the total power input in kW at any given set ofrating conditions, expressed in Btuh per watt (Btuh/watt). 

### 3.4.1 Standard Energy Efficiency Ratio. A ratio calculatedfrom thecapacity andpowerinputvalues

-obtained at Standard Rating Conditions. 

### 3.5 Coefficient ofPerformance (COP). A ratio calculated by dividing the total heating capacity provided by the refrigeration system including circulating fan heat but excluding supplementary resistance heat, (MBh) by the total electrical input (kW) 

### x 3.412. [A ratio calculated for bothcooling and heating capacities by dividing capacity in kW by power input in kW.J 

### 3.6 Integrated Part Load Value (IPLV). A single number cooling part-load efficiency figure of merit calculated per the method described in 5.2.2. 

### 3.7 "Shall", "Should", "Recommended", or "It is 

### Recommended". "Shall", "should", "recommended", or "it is recommended" shall be interpreted as follows: 

### 3.7.1 Shall. Where "shall" or "shall not" is used for a provision specified, that provision is mandatory ifcompliance with the standard is claimed.ARI STANDARD 340-86

_______________________ _


### 3.7.2 Should, Recommended, or It 

### is Recommended. "Should", "recommended", or "itis "recommended" is used to indicate provisions which are not mandatorybut which are desirable as good practice.

Section 4. Classification 4.1 

### Classification. Normally, commercial and industrial unitaryheatpumps within the scope ofthis standard may be classified as shown in Table 1.

Section 5. Testing and Rating Requirements 5.1 

### Standard Ratings. Standard ratings shall be established at the Standard Rating Conditions specified in 5.1.4. All standard ratings shall be verified by tests conducted in accordance with the ASHRAE Standard 

### Methods o/Testingfor Rating Unitary Air-Conditioning andHeat Pump Equipment (American Society ofHeating. Refrigerating and Air-Conditioning Engineers. Inc. Standard 37-78). and with the test methods and procedures as described in this standard. Modifications as set forth in 5.1.1 may be employed. StandardRatings relatedto cooling orheating capacities shall be net values, including the effects of circulatingfan heat. but not including supplementary heat. Standard Rating (Cooling) shall be stated as total (sensible plus latent) cooling capacity and sensible cooling capacity. StandardInputRatingsshallbethe totalpowerinput to the compressor(s) and fan(s), plus controls and otheritemsincluded as part ofthe model number(s) and therefore does not include power input to auxiliary equipment. 5.1.1 

### Modified Air Flow Measuremelll Method. Forheat pumps with Standard Ratings of401 MBh [117.3 kW] and greater. indoor air flow may be measured in accordance with 7.6 of ASHRAE Standard 37-78. 5.1.2 

### Values of Standard Capacity Ratings. These ratings shall be expressedonlyin terms ofthousands ofBtu per hour (MBh) [kW] in multiples of 2 MBh [0.6 kW] for units with Standard Ratings of 400 MBh [117 kW].and under. For units with Standard Ratings ofover400MBh [117kWJ. the ratings shall be expressed in multiples of 5 MBh [1.5 kWJ. 

### 5.1.3 Values ofStandard Energy Efficiency Ratios ofCoefficients ofPerformance. Energy Efficiency Ratios (EER) for cooling, whenever published, shall be expressed in multiples of the nearest 0.1 Btub/wall [cooling COP and Integrated Part Load Values (IPLV) in multiples of0.1]; standard coefficients ofperformance for heating, wheneverpublished, shall be expressed in multiples ofthe nearest 0.1. 5.1.4 

### Standard Rating Conditions. The conditions oftestforStandardRatings shall include the following: 5.1.4.1 

### Standard Rating Temperatures.

. a. Cooling (Not required for heating-only units) Air temperature entering indoor portion of unit

.......... 80 F [26.7°C] dry bUlb. 67 F [19.4°C] wet bulb Air temperature surrounding unit

.... 95 F [35.0°C] dry bulb· ·For units or portions thereofintended to be installed only indoors. this temperature may be changed tobe the same as the air temperature entering the indoor portion of unit.
TABLE 1. CLASSIFICATION OF COMMERCIAL AND INDUSTRIAL UNITARY HEAT PUMPS Types ofCommercial**an~** !ndustrial Unitary Heat Pumps ARIType Heating & Heating Heat Designation Cooling Only Source Arrangement**~ingle** Package HSP-A HOSP-A Air FAN 

### I COMP INDOOR

# IOUTDOOR

COIL COIL Remote Outdoor HRC-A-CB HORC-A-CB Air

. FAN

Coil INDOOR OUTDOOR COIL COIL


# . COMP Split System HRCU-A-CB HORCU-A-CB Air I FAN COMP I INDOOR OUTDOOR

COIL COIL

2

### ________________________ ARI STAN DARD 340-86

Air temperature entering outdoor portion of unit

.......... 95 F [35.0°C] dry bulb b. High Temperature Heating" Air temperature entering indoor portion

of unit

.... '"

... 70 F [21.1°C] dry bulb. 60 F [15.6°C] wet bulb, max.**~ir** temperature surrounding unit

.... 47 F [B.3°C] dry bulb* Air temperature entering outdoor portion

ofunit

........... 47 F [B.3°C] dry bulb, 43 F [6.1°C] wet bulb c. Low Temperature Heating** Air temperature entering indoor portion of unit

.......... 70 F**[21.~°C]** dry bulb, 60 F [15.6°q web bulb, max. Air temperature surrounding unit

.... 17 F [-B.3°C) dry bulb* Air temperature entering outdoor portion ofunit

......... 17 F [- B.3°C] dry bulb, 15 F [-9.4°C] wet bulb 5.1.4.2 Voltage and Frequency. Recommended nameplate voltages for 60 Hertz.systems are one ormore ofthe following utilization voltages: 200, 230.460. 575. Standard Rating tests shall be performed at the nameplate rated voltage(s) and frequency. Forheat pumps with dual nameplate voltage ratings, Standard RatingTests shall beperformed at both voltages, orat the lowerofthe two voltages. ifonlya single StandardRatingis tobepublished. 5.1.4.3 Indoor-Side Air Quantity. All Standard Ratings shall be determined at an indoor-side air quantity, delivered against at least the minimum external resistance required by 5.1.4.6, as outlined below. All air quantities shall be expressed ascfmrUs] of Standard air (density 0.07510 per cu ft [1.2 kg/mll). Heat pumps employing indoor coil fans shall be ratedat the airquantityspecifiedbythe manufacturer in his Standard Ratings, not to exceed 37.5 cfm per MBh [0.06 UsperKw] of rated cooling

. capacity, or at the air quantity ofwhich the drive

is capable when operating against the external resistance specified in 5.1.4.6. whichever is less. Indoor-side air quantities as referred to herein apply to the air quantity experienced when the

·For units or portions thereof intended to be installed only indoors. this temperature may be changed to be the same as the air temperature entering the indoor portion ofunit. oOIf unit defrosts during the test. the indoor supply air temperature

shall not drop below 65 F [IS.3°C] for more than one minute. Compliance with this requirement is not required if the control circuitryis such as toprovide forsupplementaryheat duringdefrcst. unit is cooling and dehumidifyingunderthe Standard Rating Cooling Conditions specified in this section. Heating-onlyunitsshall use the air quantity experienced when the unit is operating under the Standard High Temperature Heating Rating Conditions. This air quantity, except as noted in 6.4, shallbeemployedin all othertestsprescribed herein without regard to**resu1ti~g** external static pressure. 5.1.4.4 Outdoor-sideAir Quantity. All Standard Ratings for air-source units shall be determined at the outdoor-side air quantity specified by the manufacturer where the fan drive is adjustable; or, where the fan drive is non-adjustable, they shall be determined at the outdoor-side air quantity inherent in the heat pump when operated with all ofthe resistance elements associated with' inlet louvers and any ductwork and attachments considered by the manufacturer as normal installation practice.Once established. the outdoorside air circuit of the heat pump shall remain unchangedthroughoutall testsprescribedherein. 5.1.4.5 Requirementsfor Separated Assemblies. All Standard Ratings for heatpumpsin which the outdoorsection is separated from the indoor section, as in Types HRC. HORC. HRCU and HORCU (shown in Section 4). shall be determined with at least 25 feet [7.62 m] ofinterconnection tubing on each line, of the size recommendedby the manufacturer. Such heatpumpsin which the interconnection tubing is furnished as an integralpartofthemachine notrecommended for cutting to length shall be tested with the complete length of tubing furnished, or with 25 feet [7.62 m] oftubing. whichever is greater. At least 10 feet [3.05 m] of the interconnection tubing shall be exposed to the outside conditions. with

' the rest ofthe tubing exposed to the inside conditions. The line sizes, insulation, and details of installation shallbein accordancewith themanufacturer's published recommendations. 5.1.4.6 External Resistances. Indoor air-moving equipment intended for use with field installed duct systems shallbe designed to operate against, and tested atnotless than, the minimum external resistance shown in Table 2 when delivering the rated capacity and air quantity specified in 5.1.4.3. Indoor air-moving equipment not intended for use with field installed duct systems shall be tested at 0 in. water [0 Pal external pressure. In interpreting this requirement, it is understood that the most restrictive filters, supplementary heating coils. and other equipment recommended as optional parts ofthe heatpump be in place and that the net external resistances 3ARI STANDARD 

### 340-86

________________________________________________ _

TABLE 2. MINIMUM EXTERNALRESISTANCE
Minimum ·Standard Capacity Ratings External Resistance (Inches of (MBh) [kW] Water) [Pal 135 thru 210 39.6 thru 61.6 0.35 87.2 211 thru 280 61.7 thru 82.1 0.40 99.6 281 thru 350 82.2 thru 102.6 0.45 112.1 351 thru 400 102.7 thru 117.2 0.55 137.0 401 thru 500 117.3 thru 146.6 0.65 161.9 501 and over 146.7 and over 0.75 186.8 ·Cooling Capacity for units with cooling function; High Tern· peratureHeatingCapacityforheating-onlyunits (See**5.~.4.3)** specified above'areavailable fortheexternalduct system. 5.2 Part Load Rating. Heat pumps which are capable ofcapacityreduction shall berated at 100% and at each step ofcapacityreduction provided by the refrigeration system(s) as published by the manufacturer. These rating points (cooling only) shall be used to calculate the IPLV (see 5.2.2). 5.2.1 Part LoadRating Conditions. The conditions of test for part load ratings are the same as for the StandardRatings (See 5.1) exceptforthe following: 5.2.1.1 Part Load Rating Temperatures (Cooling) Air temperature entering indoor portion of unit

............ 80 F [26.7°q dry bulb, 67 F [19.4°C] wet bulb Air temperature surrounding unit

. . ..... 80 F [26.7°q dry bulb Air temperature entering outdoor portion of unit

....... . ..... 80 F [26.7°C] dry bulb 5.2.1.2 Part Load Rating Temperatures (Heating): All temperatures are the same as those shown in 5.1.4.1b High Temperature Heating. 5.2.1.3 The capacity reduction means may be adjustedto obtainthespecified stepofunloading. No manual adjustment ofindoor and outdoor air quantities from those of the Standard Rating Conditions shall be made. However, automatic adjustment of outdoor air quantities by system function is'permissible. 5.2.2 Integrated Part Load Value (IPLV). For equipmentcoveredby this standard, theIPLV(in EER) shall be calculated as follows:

4 a. Determine the capacity and EER at the conditions specified in 5.2. except 5.2.1.2. b. Determine the part-load factor (PLF) from ') Figure 1 "Part-Load Factor Curve" at each rating point (see example in Appendix 

### A).

c. Use the following equation to calculate IPLV:
IPL V = (PLF1 - PLF 2 ) 

### (EERJ ; EER2)



## + PLF 2 - PLF.J (EER2 ; EER.J)



### +
....... . . 

## + (PLF

- PLF) (EER,,_1 

## + EERn) n-l n 

### 2 

## + (PLFn)(EERnr where: PLF = Part-Load Factor determined from Figure 1 n 

## = Total number ofcapacity steps Subscript 1 

## = 100% capacity and EER atpartload rating conditions Subscript 2; 

### 3 etc. 

## = specific capacity steps per 

### 5.2.

5.3 Application Ratings. Ratings at conditions of temperature or air quantity other than specified in 5.1.4 or 5.2. I. may be published as application ratings, and shall be based on data determinedby the methods prescribed in 5.1. 5.4 Publication ofRatings. Wherever application ratings are published or printed, they shall include, or be accompanied by, the Standard Capacity Ratings and their corresponding power inputs clearly designated 

### as such, including a statement of the conditions at which the ratings apply. 5.4.1 Capacity Designation. The capacity designation used in published specifications, literature or advertising, controlled by the manufacturer, for heat pumps rated under this standard, are to be expressedonlyin MBh [kW] atthe StandardRating Conditions specified in 5.1.4 and in the terms describedin 5.1.2 through 5.1.3. Horsepower, tons or other units shall not be used as capacity designa-

-tions. 5.5 Tolerances. Tocomplywith this standard,published cooling capacity, heating capacity(s) and energy efficiency ratings, shall be based on data obtained in accordance with the provisions of this section, and shall be such that any production unit, when tested, will meet these ratings exceptfor anallowance tocovertesting and manufacturingvariations;theamountofallowance to be minus 5 per cent. 

# t I· 

### ...**·~ ::~** **r.;. .!:=** **":·** .:::.--:t :\::



### ----------------------------------------______ ARI 

### STANDARD 340-86

PART LOAD FACTOR CURVE



### to**~ ~**  

### / 

# , 0

.9 

# /
0

.8 

# /
0

.7 

# / 

# I L2 0

.6 

### 'I ...J 

# e:. J a: 

# I g 0

.5 () 

# I Lf Cl 0.4 

## 1 

# c5 I ...J 

## h: 0.3 

# I**~** 

# /
0

.2 

# I /
0.1 

# /**~ ~** 

## /'

0 0 20 40 60 80 100

PERCENT OF FULL-LOAD CAPACITY AT PART-LOAD CONDITIONS



### Note: Curve is Based on Following Equation: PLF 

### = AO + (A1 XQ)+(A2xQ2 

### )+(A3xQ3

### )+(A4xQ 4

### )+(ASxQ5) + (A6XQ6) 

### where: PLF = 

### Part-Load Factor Q = 

### Percent offull-load capacity at part-load rating conditions. AO = 

### -0.12773917 X 

### 10- 6



### ' A1 

## = -0.27648713 x 10- 3 

### A2 = 

### 0.50672449 X 

### 10- 3 

### A3 = 

### -0.25966636 x 

### 10-4 

### A4 

## = 0.69875354 x 

### 10- 6 

### AS = 

### -0.76859712 X 

### 10- 8 

### A6 

## = 0.28918272 x 10- 10

FIGURE 1 5ARI STAN DARD 340-86

________________________ _
Section 6. Performance Requirements 6.1 Performance Requirements. To comply with this standard. commercial and industrial unitary heat pumps shall be designed and produced in accordance with the provisions of this section in such a manner that any production unit will meet the requirements detailed herein.6.1.1 Heating-only units are not intended to meet the requirements ofperformance tests pertaining to the cooling mode. 6.2 Maximum Operating Conditions Test. Commercial and industrial unitary heat pumps shall be designed and produced topass the following maximum operating conditions test with an indoorside coil air quantity as determined under 5.1.4.3: 6.2.1 Temperature Conditions. 6.2.1.1 Cooling. Air temperature surrounding unit

............. 115 F [46.1°C] dry bulb· Air temperature entering indoor portion ofunit

............ 80 F [26.7°C] dry bulb, 67 F [19.4°C] wet bulb Outside air temperature

...... 115 F [46.1°C] dry bulb (and at the standard condenser air quantity specified and stated by the manufacturer) 6.2.1.2 Heating. Air temperature entering indoor portion of unit

............. 80 F [26.7°C] dry bulb Air temperature surrounding

. unit

.............. 75 F [23.9°C] dry bulb

.· Outside air temperature

............... 75 F [23.9°C] dry bulb, 65 F [18.3°q**~et** bulb 6.2.2 Voltages. Tests shall be 

## run at"the minimum and maximum utilization voltagesofVoltage Range A as shown in Table 1 of ARI Standard 110 at the unit's service connection and at rated frequency. 6.2.3 Procedure. 6.2.3.1 The heat pump shall be operatedfor one hour at the temperature conditions and voltage(s) specified. 6.2.4 Requirements. During both entire tests, the heat pump shall operate continuously and without failure of any of its parts. 6.3 Voltage Tolerance Test. Air-source unitary heat pumps shall be designed and produced to pass the fol-**·F~r** units or ponions thereof intended to be installed only indoors.

this tcmre,rature**~ay** be**cha~l:!ed** to be the same as the air tempera. ture entenng the mdoorporllon ofunit. 

### 6 lowingvoltagetolerance testwith a cooling coil airquantity as determined under 5.1.4.3. 6.3.1 Temperature Conditions. Temperature conditions shallbe maintainedas shownin 5.1.4.1.a (or in 5.1.4.1.b for heating only units). 6.3.2 Voltages. 6.3.2.1 Tests shall be run at the Range B minimum and maximum utilization voltagesfrom ARI Standard 110,Table 1,basedupontheunit's nameplate rated voltage(s). These voltages shall besuppliedatthe unit'sservice connection and at ratedfrequency. A lower ora highervoltage shall be used, iflisted on the nameplate. 6.3.2.2 The power supplied to the heat pump shall be adjusted just prior to the shut down period (See 6.3.3.2) so that the resulting voltage at the unit's service connection is 86 per cent of nameplate rated voltage when the compressor is on locked rotor.Forthe purpose ofthis standard, the compressor nameplate locked-rotor amperes may be used to determine this voltage. The proper value of no-load voltage which will give the specified voltage at locked-rotor conditions should be determined prior to the test.

. Thelocked-rotorcurrentvalue ofanymotorshall be measured as follows:

a. All hermetic compressor motors shall be tested as a compressor assembly. b. The motor winding temperature shall not exceed 77 F [25°C] when the voltage is applied. c. The current reading shall be taken within four seconds after the voltage is applied. If the testis repeated, the motorwinding shall be allowed to cool to 77 F [25°C] or lower before the current is reapplied. d. The voltage at the unit service connection, at the time the current reading is taken, shall be the manufacturer'snameplate rated voltage. e. The locked-rotorcurrent shall be measured with an ammeter, with the rotor actually locked. 6.3.2.3 Within one minute after the heat pump has resumed continuous operation (See 6.3.4.3), the voltage shall be restored to the values specified in 6.3.2.1.
6.3.3 Procedure. 6.3.3.1 The heat pump shall be operatedfor one hour at the temperature conditions and voltage(s) specified._________________________ ARI STANDARD 340-86

6.3.3.2 All power to the heat pump shall be cut offfor aperiod sufficient to cause the compressor to stop (not to exceed five seconds) and then restored. 

### 6.3.4 Requirements. 6.3.4.1 During both entire tests, the heat pump shall operate without failure of any of its parts. 6.3.4.2 The heat pump shall operate continuously without interruption for any reason for the one hour period preceding the power interruption. 6.3.4.3 The unit shall resume continuous operation within two hours ofrestoration ofpowerand shall then operate continuouslyfor one halfhour.

_ Operation andresetting ofsafety devices priorto establishment ofcontinuous operation is permitted. 6.4 

### Low-Temperature Operation Test (Cooling). Commercial and industrial unitary heat pumps shall be designed and produced to pass the following lowtemperature operation test when operating with initial air quantities as determined in 5.1.4.3 and 5

. 1.4.4, and with controls,and dampers set to produce the maximum tendency to frost or ice the evaporator, provided such settings are not contrary to the manufacturer's instructions to the user: 

### 6.4.1 Temperature Conditions. Air temperature entering indoor portion of unit

...... . ....... 67 F [19.4°q dry bulb, 57 F**[13.~q** wet bulb Outside air temperature

................. 67 F [19.4°q dry bulb 

### 6.4.2 Voltage andFrequency. This test shallbe performed at nameplate rated voltage and frequency. 

### 6.4.3 Procedure. The test shall be continuous with the unit on the cooling mode, for not less than four hours afterestablishment ofthe specified temperature conditions. The unit will be permitted to operate under control of a limit device, ifprovided. 

### 6.4.4 Requirements. 6.4.4.1 During the entire test, the heat pump shall operate without damage to the equipment. 6.4.4.2 During the entire test, the air quantity shall not drop more than 25 per cent from that determined under the Standard Rating Test. 6.4.4.3 During the test, and during the defrosting period after the completion ofthe test, all ice or meJtage must be caught and removed by the drain provisions. 

### 6.5 Tolerances. The conditions for the tests outlined in 6.2,6.3 and 6.4 are average values subject to tolerances of ± 1.0F [±osq for air wet bulb and dry bulb temperature, ± 0.5 F [±0

.3°q for water temperatures and ± 1.0 per cent of the reading for voJrages.

SectIon 7. Safety Recommendations 

### 7. 1 Safety. Itis stronglyrecommended that the product be designed, constructed, assembled and installed in accordance with nationally recognized safety standards and codes appropriate for products covered by this standard.
Se(4tion 8. Voluntary Conformance ' 

### 8.1 Conformance. While conformance with this stand

ard is voluntary, conformance shall not be claimed or implied for products or equipment within itsPurpose (Section 

### 1) and Scope (Section 

### 2) unless such claims meet all the requirements of the standard.

7ARI STANDARD 340-86

________________________________________________ _


### APPENDIX A METHOD AND EXAMPLE OF CALCULATING INTEGRATED PART LOAD VALUES (IPLV)
Section A1. Purpose and Scope 

### AI.I Purpose. 

### A.I.I.I This appendix shows example calculations for determining Integrated Part Load Values (IPLV).



### .AI.2 Scope. 

### A.I.2.1 This appendix is for equipment covered by this standard.

Section A2. Equations and Definitions of Terms


### A2.1 General Equation.
IPLV =

# (P~Fl - PLF z ) 

### (EERJ ; EER2)



## + PLF z - PLF J (EERz ; EER3)


## +
........ . (PLF

_ PLF) 

### (EERn_J 

### + EERn) 

### + n-J n 2 

## + (PLFn}(EERn) where: PLF 

## = Part-Load Factor determined from Figure 1



### 8 n 

## = Total number ofcapacity steps Subscript 1 = 100% capacity and EER at partload rating conditions Subscript 2; 3 etc. = specific capacity steps per 

### S.2. Section A3. Calculation Example for a Four Capacity Step System 

### A3.1 Unit Performance Data & 

### Sample Calculation. 

### A3.1.1 Assume equipment has four capacity steps as follows: • 100% (full load} 

### • 7S% of full load 

### • SO% offull load • 25

### % offull load 

### A3.1.2 Obtain partload factors from Figure 1 (see Figure Al Example). 

### A3.1.3 Obtain EER at each capacity step per 

### S.2. A3.1.4 Calculate IPL V using the general equation with: 

### n=4 PLF1 

## = 1.0 PLF:z = 0.9 PLF3 = 0.4 PLF4 = 0.1 EERI = 8.9 EER:z = 7.7 EER3 = 7.1 EER4 = 

### S.O Enterthe above values in the general equation, (A2.1).
IPLV 

## = (1.0_0.9}(8.9 ; 7.7)



## + (0.9-0.4}e.7 ; 7.1)



### + (0.4-0.1}C· 1;S

.0)+(0.lXS.0)



## = (0.1 x 8.3) 

## + (O.S X7.4) 

## + (0.3 x 6.0) 

## + 0.5 

## = 0.83 

## + 3.70 

## + 1.80 

## + O.S IPL V = 6.83 rounded to 6.8 Tofurtherillustrate thecalculationprocess see Figure A2 Example.

### ~ ________________________ AR I STAN DARD 340-86

PART LOAD FACTOR CURVE

1.0 

### r- 

# - "**~** / 100" 0.9 l- / 

## i 0

.8 

## I II'
0.7 

# I 

# il w:- 0

.6 

## 'I ..J 

# e:. j JI' II: 

## Q 0.5 

# I**~** 

# I u.; 

## I 0 0.4 

# c5 

# - J ..J

### ~ 0.3 

# 7**j~ ~**  

## [7

0.2 

### j 

# / 

# / 0.1



### ...... 1"

0 

### -'VJ

0 20 40 60 80 100

PERCENT OF FULL-LOAD CAPACITY AT PART-LOAD CONDITIONS



### Note: Curve is Based on Following Equation: PLF = AO + (AI XQ)+(A2xQ2)+(A3xQ3)+(A4xQ4)+(ASX QS)+(A6xQ6) 

### where: PLF = 

### Part-Load Factor Q = 

### Percent offull-load capacity at part-load rating conditions

.

. AO = -0.12773917 X 10- 6

Al = -0.27648713 x 10- 3 A2 

### = 0.50672449 X 10- 3 A3 

### = -0.25966636 x 10- 4 A4 

## = 0.69875354 x 10- 6 AS = -0.76859712 X 10- 8 A6 = 0.28918272 x 10- 10

FIGUREA1 9

### ..... o

# \\~

e FIGURE A-2 EXAMPLE IPLV CALCULATION 

### Using information from B3.1.1; B3.1.2 and B3.1.3

Capacity MCrs. Net % Full PLF1 Mfrs. Part Avg. Part PLF DiCr.

Step Cap. (Tons) Load Cap.2 Load EER Load EER
.' (For R Only)

1 50.0 100% 1.0 8.92 

## = 8.3 (1.0-0.9)=0.1 2 37.5 75% 0.9 7.7 

## = 7.4 (0.9-0.4)=0.5 3 25.0 50% 0.4 7.1

as 6.0 (0.4-0.1)=0.3 4 12.5 25% 0.1 5.0**~** 5.01 (0.1-0.0)=0.1

---- 0% 0.0 ---- Weighted Avg. EER x PLF Diff. = Avg

.

8.3 x 0.1 = 0.83 7.4 x 0.5 = 3.70 6

.0 x 0.3 

## = 1.80 5.01 x 0.1 = 0

.50 Single number IPL V 6.83·

·Rounded to 6.8 NOTES IFor the range between 0% capacity and the last capacity step. use EER of the last capacity step for the average EER. 2The 100% capacity and EER are to be determined at the part-load rating conditions. 3Part-load factor from Figure AI.



# e e**~** :zJ
(J) -I**~** Z C**~** :zJ C
Co)**~** o I C» en