Control And Safety Devices; Outdoor Unit; Unit - Hitachi FSXN Series Service Manual

5 Control system

5.3 Control and safety devices

5.3.1 Outdoor unit

Compressor protection
The compressor is protected by the following devices and their combinations:
1. Pressure switch: this switch stops the compressor when the discharge pressure exceeds the set value.
2. Oil heater: this band-type heater protects against the formation of foam on the oil during cold starts and remains enabled
when the compressor is at a standstill.
Model
Compressor
Pressure switches
High pressure
Fuse capacity (3N~ 400V 50Hz)
Oil heater
Power
CCP timer
Time setting
Direct current module for fan
Fuse capacity
5.3.2 CH unit
Model
For control circuit
Fuse capacity on PCB
111
SMGB0065 rev. 1 - 12/2010
Disconnection MPa
Connection MPa
W
min.
A
A
RAS-(8-12)FSXN
Automatic restart (one per compressor)
-0.05
4.15
-0.15
±0.15
3.20
40x2
40x2
Not adjustable
3
20x1
CH-(6.0/10.0)N1
5
RAS-(14-18)FSXN
40x2 + 32x2
40x4
5