Reciprocating Compressor M Series
3-10
Cooling Water Piping
z Do not limit the flow in the cooling water system from the oil cooler to the head
jacket. This is dangerous because the difference of pressure loss (resistance)
restricts the cooling water flow, resulting in failure to cool necessary sections.
z Always flow cooling water during operation of compressor.
For compressor with water cooled type oil cooler and water cooling head cover, observe the following when
performing piping for cooling water.
z For automatic operation, attach solenoid valves so that cooling water does not flow while the motor is
not in operation. If cooling water flows while the motor is stopped, refrigerant in the compressor is
condensed, resulting in increase of oil consumption, and possible compressor damage from hydraulic.
Fig. 3-6 Cooling water piping (internal oil cooler specification)
Fig. 3-7 Cooling water piping (external oil cooler specification)
Symbol Usage Size Remarks
A Cooling water inlet 20A 20 A
B Cooling water outlet 20A 20 A
C Cooling water piping 20A 20 A To the head cover
D Oil piping 20 A From the crankcase
E Oil piping 20 A To the crankcase
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