Activation For Protection Device Control - Hitachi RASC-4HNPE Service Manual

5 Control system
Standard control functions

5.4.3 Activation for protection device control

Operation
Excessively high
drain water level
on RU
Excessively high
drain water level
on IU
Excessively high
temperature of IU
fan motor
Overcurrent (>5A) to
control circuit
Overcurrent to MC
Excessively high
discharge gas
temperature
High pressure
4.15 MPa
High temperature of
inverter fin
High temperature of
RASC unit fan
Overcurrent (>5A) to
control circuit
IU: Indoor unit
RU: RASC unit
91 SMGB0091 rev.2 - 11/2015
B
FS: Open contact Power to H2: OFF
Activation of IU PCB
A
protection device
ITI: open
Blown fuse Power to IU
EFR1 on IU transformer: OFF
A
Blown fuse
EF1, EF2
Activation of RU
B
PCB protection
device
PSH: Open contact Y52C: OFF
CMC: OFF
ITO: Open
Blown fuse
A
EFR1 on RU
YH2: Closed contact MD: ON
B
"RUN" light flickers
MIF: stop
Light and LCD are
not indicated
B
A
MC: OFF
MOF: OFF
5