Hanbell RC2-D, Technical Manual

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RC2-D Technical Manual
36
Diagram of water cooling system (single compressor)
Diagram of water cooling system (Parallel connection)
7.5 Motor temperature control - Application of liquid injection
When the compressor starts up, the suction temperature is too high or the compressor operates
under the following conditions, it is recommended to use the motor liquid injection to reduce the
motor temperature, so as to ensure the safe and efficient operation. B D

R22 refrigerant, condensation temperature > 40
℃

R404A / R507 refrigerant, condensation temperature > 35
℃
7.5.1 Application
An auxiliary cooling system should be provided in the region with high condensation temperature or
low evaporation temperature on the operation range diagram to prevent compressor overheating
and ensure the normal operation
.
The simple auxiliary cooling way is to directly lead a pipe from the
system liquid pipe into the preset liquid injection connector of the compressor to cool the motor. For
the liquid injection system, the injection controller is optional. The liquid injection controller reads
the temperature through embedded NTC, and then automatically controls the liquid injection. When
the motor temperature is more than 80
℃
, the injection is turned on; When the motor temperature
is less than 60
℃
, theinjection is closed.