Backup Operation - Panasonic U-8ME1E8E Service Manual

12. Backup Operation

12-1. Automatic Backup Operation
This system includes a function for automatic backup operation. An alarm is displayed on the remote controller to
inform the user that a failure has occurred.
12-1-1. Alarms that result in automatic backup operation
When the following alarm occurs, automatic backup operation is engaged. Automatic backup opration is not
engaged in cases of serious alarm such as communications alarms etc.
- Alarm list 1 (Backup operation continues as long as power supply of all outdoor units doesn't cut)
1
Alarm display
H11
H12
H13
H21
H22
H23
H31
P16
P29
* When there is one outdoor unit in the system, only failed compressor stops.
* When there are multiple outdoor units in the system, the outdoor unit which mounts the failed compressor stops.
<Caution>
After automatic backup operation caused by alarm listed in alarm list 1, it will not be canceled automatically when
the repair of the failed outdoor unit is completed. Automatic backup mode will be canceled only when the power
on outdoor unit No.1 is reset. Therefore, after repair work is completed, be sure to check whether or not automatic
backup mode has been canceled.
- Alarm list 2 (Backup operation continues as long as the problem doesn't solve)
Alarm display
F04
F05
F06
F07
F08
F12
F16
F17
F23
F24
F22
H08
H15
H25
H27
H28
P03
P17
P18
A
* When there is one outdoor unit in the system, only compressor that has sensor failure stops.
* When there are multiple outdoor units in the system, the outdoor unit which contains the problem stops.
B
* When there is one outdoor unit in the system, the backup operation does not work.
* When there are multiple outdoor units in the system, the outdoor unit which contains the problem stops.
* Backup operation caused by an alarm listed in "alarm list 2" will finish automatically after 24 hours if the same
alarm does not occur again for 24 hours.
Overcurrent of compressor 2 (Constant speed)
Lock current of compressor 2 (Constant speed)
Open CT of compressor 2 (Constant speed)
Overcurrent of compressor 3 (Constant speed)
Lock current of compressor 3 (Constant speed)
Open CT of compressor 3 (Constant speed)
Overcurrent of HIC for inverter compressor
Overcurrent of inverter device
Malfunction of inverter compressor start
Discharge sensor failure for compressor 1
Discharge sensor failure for compressor 2
Gas temperature sensor in heat exchanger 1
Liquid temperature sensor in heat exchanger 1
Ambient air temperature
Suction temperature
High pressure sensor failure
Low pressure sensor failure
Gas temperature sensor in heat exchanger 2
Liquid temperature sensor in heat exchanger 2
Discharge sensor failure for compressor 3
Oil temperature sensor 1 (Inverter compressor)
Discharge temperature of compressor 1 disconnection
Discharge temperature of compressor 2 disconnection
Oil temperature sensor 2
Oil temperature sensor 3
Discharge temperature protection of compressor 1
Discharge temperature protection of compressor 2
Discharge temperature protection of compressor 3
Control Functions - Outdoor Unit
1 - 36
2WAY SYSTEM
Compressor/outdoor
unit operation
A
A
B
B
B
B
B
B
B
B
A
B
A
A
B
B
A
A
A