Hanbell RC2-930A - Page 16

Technical Manual VERSION 2.0 -10-18-2018
16

 


4
68
14 50 68
32
86
104
122
140
158
°F
20
30
40
50
60
70
20 10 10 20
0
°C
Evaporating Temperature
Condensing Temperature
R1234yf Application Limits
25%
50%
75%
Motor A2
Motor B1
Motor A1
With Min
pressure valve

4
68
14 50 68
32
86
104
122
140
158
°F
20
30
40
50
60
70
20 10 10 20
0
°C
Evaporating Temperature
Condensing Temperature
R1234ze Application Limits
25%
50%
75%
Motor A2
Motor A1
With Min
pressure valve
Note:
1. When Hanbell screw compressor operate in partial or full load within limits, temperature of motor coil and discharge
will rise concurrently. In order to keep the safe running of compressor continuously , Hanbell recommend
application of the following additional cooling devices :
(1) Oil cooler or (2) Liquid injection to chamber or (3) Liquid injection to motor.
Please refer to Hanbell selection software for application of additional cooling system.
Hanbell recommends monitoring oil pressure differential and keep it 4


 over the suction pressure for
adequate seal, lubrication and capacity control by pressure differential switch passively or by additional oil pump or
minimum pressure valve actively. Especially under operation conditions with low condensing temperature and high
evaporating temperature like application in flooder watercooled chillers, highlow pressure difference tends to be
less than 4


 , installation of oil pump is recommended to ensure regular oil pressure.
Contact with Hanbell to verify potential operating conditions outside the limits shown.
2. If compressors run continuously at partial load below 50%, failure of motor coils might happen due to insufficient
cooling. Therefore, Hanbell emphasizes installation of liquid injection system to motor to make sure adequate
cooling of motor coils for safe running of compressors. According to EN12900, suction superheat is 10°k and liquid
subcooling is 0°k.
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