4
Piping Diagrams
●Piping Diagrams
55
Piping
Diagrams
No. Part Name Function
① Compressor
This compressor sucks in and compresses low-temperature
and -pressure gas refrigerant generated by evaporator to
make it into high-temperature and -pressure liquid refrigerant.
② Condenser
Used to make the high-temperature and -pressure
gas refrigerant generated by the compressor to turn
to high-temperature and -pressure liquid state.
③ Fan (for condenser)
Used to accelerate heat exchange with the refrigerant
in the condenser by forcible blowing.
④ Electronic expansion valve for main circuit (EEV)
The valve mechanism reduces pressure of the
high-temperature, high-pressure liquid refrigerant
produced in the condenser, to produce low-
temperature, low-pressure liquid/gas mixed
refrigerant.
⑤ Motor operated valve for hot gas (MOV)
This valve controls cooling capacity under low load by
bypassing refrigerant from the high pressure side to
the low one.
⑥ Evaporator
Used to make low-temperature, low-pressure liquid
refrigerant decompressed through the electronic
expansion valve into low-temperature and -pressure
gas by heat exchange and evaporation with oil.
⑦ Oil pump
Used to draw oil from the unit outside and discharge it
to the outside through the evaporator.
⑧ Relief valve
The relief valve controls the outlet side pressure to
the specified level.
⑨ Rubber hose
This is the portion of the oil piping used on the
discharge side of the oil pump.
⑩ Air filter
This filter is installed in front of the evaporator to
prevent drop of cooling capacity caused by dust
attached to the condenser by drawn air.
⑪ Oil drain (evaporator)
The evaporator oil can be discharged from this oil
drain for maintenance of the oil cooling unit.
⑫ Oil drain (drain pan)
Used to drain oil from the bottom of the oil cooling
unit.
⑬ Circuit breaker ("-B" only)
The circuit breaker activates in case of overcurrent to
protect the wiring system in the unit.
⑭ High pressure switch ("-C" only)
In order to protect the refrigerant system in the
compressor, it activates in case of high-pressure error.
⑮ Compressor protection thermostat
In order to protect the compressor, it activates in case
of high-pressure error of the compressor.
⑯ Heater ("-H" only)
Used to heat oil to the temperature preset by the
electric heater at warm-up in winter.
⑰ Oil tank ("-T" only)
It receives oil in the oil piping system with the main
machine, and deals with fluctuations in oil level.
⑱ Transformer ("-048" only) Intended for the different-voltage model.
00_PB00540A_M10.indb 55 2023/08/09 12:58:59
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