[5-2 Outdoor Unit Control ]
5-2-13
Emergency Operation Mode
1. Problems with the outdoor unit
Emergency operation mode is a mode in which outdoor units that are operating normally take over the operation of the outdoor units that are experiencing problems. (P550-P1000YSKD models, EP400-EP700YSKD models go into an emergency
operation mode when one outdoor unit is in trouble, and P1050-P1500YSKD models, EP750-EP1100YSKD models go into
an emergency operation mode when one or two outdoor units are in trouble.)
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)
Trouble source
Power
Error code description
0403
Serial communication error
4220,4225,4226
Bus voltage drop
4230,4235
Heatsink overheat protection
4240,4245
Overload protection
4250,4255,4256
Overcurrent relay trip
5110
Heatsink temperature sensor failure (THHS)
5301
Current sensor/circuit failure
5305,5306
Position error
TH2
5102
Subcool heat exchanger bypass outlet temperature sensor failure
TH3
5103
Pipe temperature sensor failure
TH4
5104
Discharge temperature sensor failure
TH5
5105
Accumulator inlet temperature sensor failure
TH6
5106
Subcool heat exchanger liquid outlet sensor failure
TH7
5107
Outside air temperature sensor failure
Compressor
Fan motor
Inverter
Thermistor
Error codes that permit an
emergency operation
4102
Open phase
4115
Power supply sync signal abnormality
Emergency operation pattern (2 outdoor units)
HWE18430
- 98 -
GB
[5-2 Outdoor Unit Control ]
Emergency operation pattern (3 outdoor units)
(2) Ending the emergency operation
1) End conditions
When one of the following conditions is met, emergency operation stops, and the unit makes an error stop.
When the integrated operation time of compressor in cooling mode has reached four hours.
When the integrated operation time of compressor in heating mode has reached two hours.
When an error is detected that does not permit the unit to perform an emergency operation.
2) Control at or after the completion of emergency operation
At or after the completion of emergency operation, the compressor stops, and the error code reappears on the remote controller.
If another error reset is performed at the completion of an emergency mode, the unit repeats the procedures in section (1)
above.
To stop the emergency mode and perform a current-carrying operation after correcting the error, perform a power reset.
(1) Starting the emergency operation (When the OC is in trouble)
1) When an error occurs, the error source and the error code appear on the display on the remote controller.
2) Reset the error via the remote controller to start an emergency operation.
Precautions before servicing the unit
When the OC is in trouble, the OS temporarily takes over the OC's function and performs an emergency operation. When this
happens, the indoor unit connection information are changed.
In a system that has a billing function, a message indicating that the billing system information has an error may appear on
the TG-2000A. Even if this message appears, do not change (or set) the refrigerant system information on the TG-2000A.
After the completion of an emergency operation, the correct connection information will be restored.
HWE18430
- 99 -
GB
5 Control
2. Communication circuit failure or when some of the outdoor units are turned off
This is a temporary operation mode in which the outdoor unit that is not in trouble operates when communication circuit failure
occurs or when some of the outdoor units are turned off.
[5-2 Outdoor Unit Control ]
(2) Starting the emergency operation (When the OS is in trouble)
1) A communication error occurs.
An emergency operation starts in approximately six minutes.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Emergency operation pattern (2 outdoor units)
Emergency operation pattern (3 outdoor units)
(3) Ending the emergency operation
When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode.
HWE18430
- 100 -
GB