Backup Operation - Panasonic U-8MF2E8 Service Manual
3-way vrf system
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Also See for U-8MF2E8:
- Installation instructions manual (220 pages) ,
- Operating instructions manual (180 pages) ,
- Service manual & test run service manual (50 pages)
Table of Contents
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 operation is not engaged in cases of serious alarm such as communications alarms, etc.
1
Alarm list 1 (Backup operation continues unless power supply of all outdoor units is turned off.)
Alarm display
H01
Over-current of compressor 1
H03
Compressor 1 CT sensor disconnected or short-circuit
H11
Over-current of compressor 2
H12
Lock current of compressor 2
H31
HIC trouble for compressor 1
P16
Over-current of inverter device
P22
Outdoor unit fan motor trouble
P29
Malfunction of compressor 1 start
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.
NOTE :
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.
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