Protection And Safety Control For Es Series - Hitachi RAS-(3-6)HVRNM2E Service Manual

5 Control System
5.3.2 Protection and safety control for ES 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-(2-6)H(V)RN(S)2(E)
Mode
For compressor
High pressure switch Cut-out
Cut-in
Fuse
1φ 230V, 50Hz
For control
CCP timer
setting time
For condenser fan
motor
Internal thermostat Cut-out
For control circuit
Fuse capacity on PCB
RAS-(8/10)HRNSE
Model
For compressor
High pressure switch Cut-out
Cut-in
For control
pressure switches Cut-out
Cut-in
Fuse
3 φ400V, 50Hz
For control
CCP timer
setting time
For condenser fan
motor
Internal thermostat
Cut-out
DC
Cut-out
AC Cut-in
For control circuit
Fuse capacity on PCB
127
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-(2/2.5)HVRN2 RAS-3HVRNS2
MPa
A
25
min
°C
A 3
RAS-8HRNSE
Automatic reset, non-adjustable (each one for each compressor)
MPa
MPa
A
min
°C
A
RAS-4HVRNS2E
–0.05
4.15
–0.15
3.20±15
25 40
Non adjustable
3
Automatic reset, non-adjustable (each one for each motor)
–0.05
4.15
–0.15
3.20±15
0
3.6
–0.15
2.85±0.10
40
Non adjustable
3
Automatic reset, non-adjustable
(each one for each compressor)
120±5
120±5
83±15
5
RAS-5HVRNS2E RAS-6HVRNS2E
50 50
5
RAS-10HRNSE
5