Open type
Compressor unit

Standard Speciﬁcations (-30 to -50℃)
Unit type

Inverter Drive ModeliZN 16TXⅡ-5A

Item

iZN 20TXⅡ-3AiZN 20TXⅢ-4A

50/60Hz
NH3
Motor : 380V (400V, 440V available), 3 phase
Control circuite : 200～230V, 2 phase
1 unitContinuous or step control
135
180
250
TEFC Mo. (IP54)
Inverter
125A
200A
200A
65A
100A
100A
20A
25A
25A
20A
25A
25A
50A
100A
100A‐‐‐
215
242
257
90
88904065X1895X2340
4440X1895X2340
4570X1933X2178
4745
5545
6205

Frequency
Refrigerant
Power source
Number of compressors＊1＊2＊3Capacity control
kW
Nominal output
Motor
TypeStarting method
Refrigerant gas inlet
Refrigerant gas outlet
Refrigerant liquid inlet
Connections
Refrigerant liquid outlet
Refrigerant liquid Oil cooler
inlet/outlet
Motor
Lubricating oilℓ＊4
NoisedB(A)＊5
WxDxH
Dimensionsmm
Weightkg*1: The minimum capacity depends on products range and operation conditions (25-45%).
*2: Requested to enter proper signal due to selected running mode.
*3: Partial loading value for step control can be ﬂexibly changed.
*4: Oil quantity is minimum charge only for compressor unit. Actual oil quantity for whole of the plant (system) should be determined at the site. Charge oil on site and replenish when the level gets lower
than requested. Use speciﬁed refrigeration machine oil (Supplied by user).
*5: Noise level (Scale A) indicates the values measured at 1 meter away from the compressor and 1 meter above from the ﬂoor level when the suction pressure saturated temperature is -40℃ and without
any echo inﬂuence. In the actual installed conditions the noise level maybe diﬀerent from indicated value because of the inﬂuence of surrounding noise and echo.
* : Noise control and harmonic suppression measurement should be taken as necessary according to respective guidelines.
* : Electric power for control circuit is requested users to supply.

Cooling capacity / Shaft power
CT℃

3540

ET℃

－30
－35－40－45－50－30－35－40－45－50iZN 16TXⅡ-5A

iZN 20TXⅡ-3AiZN 20TXⅢ-4A

Qo
(kW)

Pw
(kW)

Qo
(kW)

Pw
(kW)

Qo
(kW)

Pw
(kW)

249.7
231.0
203.7
159.1
118.3
246.3
227.2
200.1
156.3
116.0

113.3
114.3
114.3
102.7
90.0
121.8
123.7
123.1110.9
97.6

344.9
300.6
251.2
202.4
150.9
344.4
299.9
250.5
201.7
150.2

140.8
141.0
142.1
139.9
132.0
153.4
153.3
155.2
153.4
145.6

516.8
450.2
397.7
303.6
226.5
516.0
449.2
396.6
302.5
225.5

208.9
209.0
222.7
207.7
196.1
227.6
227.3
243.3
227.8
216.3

* : This is the case for superheat 0℃ and sub cooled with economized middle stage evaporative temperature +5℃.

Safety Precautions

1. Before operation, make sure to read the instruction manual carefully for your safety and the equipment safety as well.
2. Never attempt to perform unauthorized equipment modifications. Unauthorized modifications could lead to damage or injury.
3. The compressors are designed to compress specified refrigerant. Never use them with other gases. Doing so could result inaccidents or break downs.

・The allowable tolerances for cooling capacity and power consumption noted in the catalogue conform to JRA 4037 standards.
・The indicators, photos and evaluations in the catalogue that do not display the compliance standards are only reference information to explain the generalfeatures and performance of Kobelco’s products, They do not constitute any guarantees by Kobelco.
・Information in this catalogue may change without notice in the future. Please contact a sales representative for the latest edition.

Overseas Locations

KOBELCO COMPRESSORS VIETNAM CO., LTD（KCV） KOBELCO COMPRESSORS (SHANGHAI) CORPORATION（KCS）#3 Dang Huu Pho, Quarter 2, Thao Dien, Dist. 2, HCMC, Vietnam
Tel : +84-28-6281-8508 Fax : +84-28-6281-8478

1/D,B/Unit,Tower 3,No.1068 TianShan West Rd.Shanghai,China
Tel : +86-21-3996-6392 Fax : +86-21-3996-6390, 21-3996-6389

KOBELCO COMPRESSORS INDIA PVT. LTD.（KCIN）

249G,3rd Floor, AIHP Tower, Udyog Vihar, Phase-4, Near India Bulls BuildingGurgaon – 122015, Haryana, INDIA
Tel : +91-124-438-0750 Fax : +91-124-438-0770

Refrigeration System & New Business Division
Refrigeration System Section

16F Shin-Osaki Kangyo Building
6-4, Osaki 1-chome, Shinagawa-ku , Tokyo, 141-0032 ,Japan
Tel : +81-3-5496-0012 Fax : +81-3-5496-0019
URL : https://www.kobelco-compressors.com
Work Instructions (Specifications and descriptions herein may change without notice.) 1906015EINTEGRAL TWO - STAGE
INVERTER DRIVEAMMONIA SCREW COMPRESSORKOBELCO’s five Big Features1

Outstanding energy-saving performanceby Kobelco inverter drive compressor

The iZN series can control its cooling capacitywith its inverter drive linear speed control toavoid excessive cooling, thereby permitting
outstanding energy-saving performance.
A slide valve used for capacity control has
been replaced to inverter drive capacity control to ensure optimum operation in accordance with cooling capacity fluctuation.

Power consumption (%)

Outstanding energy-saving performanceaccording to partial loading
Partial load

Energy saved

30%
7020%
80
14 %
50%%%

Example of energy-saving effectwhen the suction-pressure saturated temperature is -40℃

100Max.

for quick and advance trouble shooting

The New iZ monitor indicates compressor running conditions, various alarms
and those histories. It also stops the compressor automatically in an emergency.

Alternative runningapplications

Alternative continuous control mode or step control
mode can be selected to meet clients’ requirements.

E/C/M lamp

Suction pressure / Remotetemperature capacity control

Continuous control with originally equipped suction
pressure sensor and also optionally installed
temperature sensor (Supplied by user) at freezingsite are available.

Additional indication

Super heat is added to monitor compressor conditions more clearly.

30%

E: Emergency stop
C: Caution
M: Maintenanceenergy-saving effect

8060

3

New iZ monitor with various functions

Fixd speed model(slide valve)●Continuous control mode
Continuous control mode enables automatic stepless changing of the rotating
speed, with targeted values set for suction pressure and inside temperature.
Control is possible even with input of a 4-20mA DC signal from the sensor.

40

16TX Inverter drive●Step control mode

200Capacity step control function is also equipped with iZ monitor. Its setting value
is available to change flexibly.
0204060

80

100Compressor protective functions

Cooling capacity (%)

Discharge temperature
Discharge pressure● Motor temperature

Savings in one year of operation

16TXⅡ- 5AElectricity
saved

CO2 reduced(Inverter drive model)

98

tonsJP¥

2,100,000<Conditions> Yearly average loading ratio: 70%, Running hrs: 6,000 hrs, Electricity cost: JP¥15/kW ET/CT = -40℃/+35℃

42

by accelerating rotating speed of inverter drive

Patent Registered

Accelerating motor speed technology with inverter drive (Patent registered) enableiZN series increase its cooling capacity at lower temperature than -30℃.
Those functions enable to select smaller compressor than before.
When suction pressure saturation
temperature is - 45℃ cooling capacity
is…

RPM
for example

20TX

24%

iZN

Inverterdrive

Motor speed increases as the evaporating temperature lowers

Conventional
model

Motor speed is constant on conventional models.
increasable approx

24%-30℃-40℃Evaporating
temperature(℃)

-45℃

Temp

Oil pressure diﬀerential
Over current

by inverter drive

The effect of an inverter drive can be found when starting up a compressor,
since conventional star-delta start-up induces inrush current and requires anapprox 10-minute interval before restarting. Thanks to an inverter that allows
smooth starting, the iZN series can restart quickly without any interval. The
smooth starting mechanism permits the compressor to stop even when conventional conditions for interruption are not allowed. This mechanism enables more
effective energy savings and downsizing of the power facility.

Conventional machines(Star-delta starting)

TimeNo. 3950304 US Patent #6484522

Series motor speed accelerates accompany
with evaporating temperature drop.

increasableapprox●

Merits of motor start-up

Smooth motor start-up by inverter drive eliminates
inrush current and hot start

Maximum 24% increase in cooling capacity●●

Current

Fixed speed model

●-30℃

-40℃

-50℃

5

COP (Coefficient of Performance) improvementwith equipping economizer (sub-cooler)

Economizer is a standard equipmentwith iZN two stage series
COP is improved by sub-cooling refrigerant in economizer
by expanding a portion of refrigerant supplied fromcondenser with expansion valve.
Sub-cooling increases cooling capacity, which enables
improvement of COP significantly at the same time.

low pressure①

compressor② high pressure⑦

middlepressurecooler⑥Expansion
valve

high
pressurecondenser③Expansion Economizer
valve
⑤④

pressure

middlepressurelowpressure④③

condensing
process

Expansion

②

⑦⑤

⑥ Δi1

Evaporatingprocess
Δi2

compression①Δi3

Enthalpy