Activation For Protection Device Control - Hitachi RAS-(3-6)HVNC1(E) Service Manual

5 Control System
5.5.4 Activation for protection device control
Operation
Excesivelly high
drain water level
Excesivelly high
temperature of IU
fan motor
Overcurrent (>5A)
to control circuit
Current of the
EHW circuit > 10A
or > 20 A
Overcurrent to
Excessively high
discharge gas
temperature
Increasing high
pressure to
4.15 MPa
Increasing
temperature at
inverter fin
Excessively
overcurrent to
MOF (DC motor)
Overcurrent (>5A)
to control circuit
IU: Indoor unit
OU: Outdoor unit
158
SMGB0087 rev.0 - 12/2013
FS: contact is
opened
A
ITI: opened
Melted EF4,5
Blow EHW fuse
Melted fuse of
EF1
B
MC
PSH: contact is
opened
Melted EFR1,
EFS1
YH2: contact is
closed
B
Activation of
protection device
for IU PCB
Power to IU
transformer: OFF
B
Power to YH2:
ON
Power to EHW: ON
A
Alarm of OU PCB
Power to Y52C:
OFF
Power to CMC:
OFF
A
MD operation: ON
RUN indicator
flashes
MIF operation: OFF
Light and LCD are
not indicated
(for unit with EHW)
MC operation: OFF
MOF1 MOF2
operation: OFF