Protection And Safety Control For Ivx Series; Compressor Protection; Safety And Control Device Setting For The Outdoor Units - Hitachi RAS-(3-6)HVRNM2E Service Manual

5 Control System
5.3 Protection and safety control
5.3.1 Protection and safety control for IVX Series

Compressor protection

The following devices and their combinations protect the compressor
High-pressure switch
Oil heater
Fan motor protection

Safety and control device setting for the outdoor units

RAS-(3-6)H(V)RNM2E
Model
For compressor
High pressure switch Cut-out
Cut-in
Fuse
1φ 230V, 50Hz
For control
3φ 400V, 50Hz
CCP timer
setting time
For condenser fan
motor
Internal thermostat Cut-out
For control circuit
Fuse capacity on PCB
RAS-(8-12)HRNM
Model
For compressor
High pressure switch Cut-out
3 φ400V, 50Hz
For control
CCP timer
setting time
For condenser fan motor
Internal thermostat
Cut-out
DC
Cut-out
AC
For control circuit
Fuse capacity on PCB 1.5
Fuse capacity on PCB 3
126
SMGB0064 rev.0 - 08/2011
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
energized while the compressor is stopped.
Internal thermostat that is embedded in the fan motor winding: this internal thermostat cuts out the
operation of the fan motor when the temperature of the fan motor winding exceeds the setting.
RAS-3HVRNM2E
MPa
A 40
min
°C
A
RAS-8HRNM
MPa
Cut-in
Fuse
A
min
°C
Cut-in
A
RAS-4H(V)RNM2E RAS-5H(V)RNM2E
4.15
3.20±0.15
40
2X20
Non adjustable
3
Automatic reset, non-adjustable (each one for each motor)
5
RAS-10HRNM
Automatic reset, non-adjustable (each one for each compressor)
4.15
3.20±15
40
Non adjustable
3
Automatic reset, non-adjustable
(each one for each compressor)
120±5
120±5
96±15
5
10
RAS-6H(V)RNM2E
–0.05
–0.15
50 50
2X20 2X20
RAS-12HRNM
–0.05
–0.15