Safety Protection And Control - Hitachi RASC-4HNPE Service Manual

5 Control system

Safety protection and control

5.2 Safety protection and control
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Compressor and fan motor protections
The following devices and their combinations protect the compressor and fan motor.
High-pressure switch This switch cuts out the operation of the compressor when the discharge pressure exceeds the setting.
This band heater protects against the oil carry-over during the cold starting, as the band heater is
Oil heater
energized while the compressor is stopped.
Internal thermostat that is embedded in the fan motor winding: this internal thermostat cuts out the
Fan motor protection
operation of the fan motor when the temperature of the fan motor winding exceeds the setting.
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RASC safety and control device setting
Model
High pressure switch for
compressor
Fuse 3N~ 400V 50Hz
Crankcase heater
CCP Timer
Setting Time
Fan Motor Fuse
Internal Thermostat for fan
motor
Fuse capacity on PCB
79 SMGB0091 rev.2 - 11/2015
Type Automatic Reset, Non-Adjustable (each one for each compressor)
Cut-Out MPa
Cut-In MPa
A
Output W
-
min.
A
Cut-Out ºC
Cut-In ºC
A
RASC(4-6)HNPE
-0.05
4.15
-0.15
+0.15
3.20
-0.15
20 x 2
52.0
Non-Adjustable
3
10 x 2
165 ± 10
130 ± 15
5.0
RASC-(8/10)HNPE
-0.05
4.15
-0.15
+0.15
3.20
-0.15
40 x 2
40.8
3
10 x 2
165 ± 10
130 ± 15
5.0
5