Control And Safety Devices - Hitachi UTOPIA RAS-4HVRP2E Service Manual

5 Control System

Control and safety devices

5.4 Control and safety devices
1 Compressor protection: the compressor is protected by High 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.
Pressure switches
High
Low
(For control)
Fuse capacity on PCB (PF1)
CCP timer
Setting time
Fuse capacity
On PCB (PF4) (for fan motor)
On PCB (EFR1) (for control circuit)
Model
Pressure switches
Cut-Out
High pressure
Fuse capacity
1~ 230V 50Hz
3N~ 400V 50Hz
Oil heater capacity
CCP timer
Time setting
Fuse capacity (for both fans)
DC 310V
3N~ 400V 50Hz
93 SMGB0136 rev.0 - 07/2021
Model
For Compressor
Cut-out
MPa
Cut-in
Cut-out
MPa
Cut-in
1~ 230V 50Hz A
-
min
For fan module
A
A
RAS-(4-6)HV(R/N)(C/P)2E
For Compressor
MPa
Cut-In MPa
A
A
W
-
min.
For fan module
A
A
RAS-3HVRC2
Automatic reset, non-adjustable (Each one
for each compressor)
-0.05
4.15
-0.15
3.20±0.15
2.85±0.1
3.6±0.15
25
Non adjustable
3
15
3
RAS-(4-6)H(R/N)(C/P)2E
Automatic restart, non adjustable (each one for each
compressor)
-0.05
4.15
-0.15
+0.15
3.20
-0.20
50
-
24
Not adjustable
3
3.15
-
-0.05
4.15
-0.15
+0.15
3.20
-0.20
-
32
24
3
5
-
5