Hitachi RAS-(4-12)HNP(1)(E) - Activation for Protection Device Control

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