Safety Protection And Control - Hitachi RCI Service Manual

5 Control system

5.2 Safety protection and control

Compressor protection
The compressor is protected by the following devices:
• High pressure switch: this stops the compressor when the discharge pressure exceeds the set value.
• Oil heater: this prevents oil from being lost during cold starts, as it is enabled while the compressor is at a standstill.
• Fan motor protection: internal thermostat located in the fan motor winding. This stops the fan motor when the winding
temperature exceeds the set value.
Setting control and safety devices for indoor units
Model
Switch
off
For the evaporator fan
motor: Internal thermostat
Switch
on
For the control circuit: Fuse
–
capacity
Switch
off
Freeze protection
thermostat:
Switch
on
Differentialthermostat –
175
SMGB0063 rev. 1 - 10/2010
RCI(M) RCD RPC
°C 145±5 130±5 135±5
°C 90±15 83±15 90±15
A
°C
°C
°C
RPIM RPI RPK RPF(I)
135±5 140±5 130±5 130±5
90±15 90±15 83±15 83±15
5
0
14
2
Remarks
Automatic reset, non-
adjustable (one per
motor)
5