Installation manual
[ VII Control ]
- 141 -
HWE10050 GB
Emergency Operation Mod e
-11- Emergency Operation Mode
1. Problems with the outdoor unit
Systems with two outdoor units have a mode that allows one of the outdoor units to perform a backup operation when the
other outdoor unit in the system malfunctions.
This mode can be started by performing an error reset via the remote controller.
(1) Starting the emergency operation
1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.
2) The error is reset using the remote controller.
3) If an error code appears that permits an emergency operation in step 1) above, (See the table below.), the retry operation
starts.
4) If the same error is detected during the retry operation (step 3 above), an emergency operation can be started by resetting
the error via the remote controller.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Emergency operation pattern
1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable ca-
pacity, some of the indoor units will go into the same condition as Thermo-OFF.
Trouble source
Error codes that permit an
emergency operation
Error code description
Compressor
Fan motor
Inverter
0403 Serial communication error
4220,4225 Bus voltage drop
4230 Heatsink overheat protection
4240 Overload protection
4250,4225 Overcurrent relay trip
5110 Heatsink temperature sensor failure (THHS)
5301 Current sensor/circuit failure
Thermistor TH3 5103 Heat exchanger outlet thermistor fault
TH4 5104 Discharge temperature sensor failure
TH5 5105 Accumulator inlet temperature sensor failure
TH6 5106 Heat exchanger inlet thermistor fault
TH7 5107 Outside air temperature sensor failure
Power 4102 Open phase
4115 Power supply sync signal abnormality
2 outdoor units
Compressor failure pattern
OC Trouble Normal
OS Normal Trouble
Emergency operation
Cooling Permitted Permitted
Heating Permitted Permitted
Maximum total capacity of indoor
units (Note 1)
60%