Hitachi RAS-(4-6)HVRNS2E - Protection and Safety Control for es Series

5 Control System
127
SMGB0064 rev.0 - 08/2011
5
5.3.2 Protection and safety control for ES Series
Compressor protection
The following devices and their combinations protect the compressor
High-pressure switch This switch cuts out the operation of the compressor when the discharge pressure exceeds the setting.
Oil heater
This band heater protects against the oil carry-over during the cold starting, as the band heater is
energized while the compressor is stopped.
Fan motor protection
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.
Safety and control device setting for the outdoor units
RAS-(2-6)H(V)RN(S)2(E)
Mode RAS-(2/2.5)HVRN2 RAS-3HVRNS2 RAS-4HVRNS2E RAS-5HVRNS2E RAS-6HVRNS2E
For compressor
High pressure switch Cut-out
MPa
4.15
–0.05
–0.15
Cut-in 3.20±15
For control
Fuse
A
1φ 230V, 50Hz 25 25 40 50 50
CCP timer
setting time
min
Non adjustable
3
For condenser fan
motor
°C Automatic reset, non-adjustable (each one for each motor)
Internal thermostat Cut-out
For control circuit
Fuse capacity on PCB
A 3 5
RAS-(8/10)HRNSE
Model RAS-8HRNSE RAS-10HRNSE
For compressor Automatic reset, non-adjustable (each one for each compressor)
High pressure switch Cut-out
MPa
4.15
–0.05
–0.15
Cut-in 3.20±15
For control
MPa
3.6
0
pressure switches Cut-out –0.15
Cut-in 2.85±0.10
For control
Fuse
A
3 φ400V, 50Hz 40
CCP timer
setting time
min
Non adjustable
3
For condenser fan
motor
Automatic reset, non-adjustable
(each one for each compressor)
Internal thermostat
DC
Cut-out
°C
120±5
Cut-out 120±5
AC Cut-in 83±15
For control circuit
Fuse capacity on PCB
A 5