Hitachi RAS-(4-12)HNP(1)(E) - Preheating Control of Compressor

5 Control System
159
SMGB0087 rev.0 - 12/2013
5
5.5.5 Preheating control of compressor
RAS-(2-2.5)HVNP1/RAS-3HVNC1
During stopping and operating compressor
< 60ºC
Power to CH: ON
Temp
at top of com-
pressor
Power to CH: OFF
Temp
at top of com-
pressor
Temp
at top of com-
pressor
≥ 60ºC
≥ 60ºC
< 60ºC
≥ 55ºC
< 55ºC
Power to OU: ON
Otherthanabove
During stopping compressor During operating compressor
< 75ºC
Power to CH: ON
Temp
at top of com-
pressor
Power to CH: OFF
Temp
at top of com-
pressor
≥ 75ºC
> 80ºC
≤ 80ºC
Power to OU: ON
Power to CH: ON
Temp
at top of com-
pressor
Power to CH: OFF
Temp
at top of com-
pressor
≥ Target temp
-15ºC
Compressor: ON
< Target temp -15ºC
≥ Target temp
-10ºC
> Target temp -10ºC