Backup Operation - Panasonic U-72MF2U9 Service Manual

12. Backup Operation

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.
Alarm list 1 (Backup operation continues unless power supply of all outdoor units is turned off.)
Alarm display
H01 Overcurrent in 1st compressor
H11 Overcurrent in 2nd compressor
H03 Current sensor for the 1st compressor is disconnected or shorted
H13 Current sensor for the 2nd compressor is disconnected or shorted
HIC for 1st compressor has failure
H31
Overcurrent or overheat of HIC
HIC for 2nd compressor has failure
H21
Overcurrent or overheat of HIC
Low on oil or the oil recovery circuit has restriction
H07
Overcurrent of 1st compressor on the secondary side of inverter circuit,
P16
or inverter failed to syncronize with rotation
Overcurrent of 2nd compressor on the secondary side of inverter circuit,
P26
or inverter failed to syncronize with rotation
Inverter for 1st compressor failed to start or failed to syncronize with
P29
rotation
Inverter for 2nd compressor failed to start or failed to syncronize with
P19
rotation
P22 Fan motor or inverter drive of outdoor unit has failure
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, only the outdoor unit which contains the problem
stops but the other outdoor units in the system operate normally.
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, only the outdoor unit which contains the problem
stops but the other outdoor units in the system operate normally.
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 all outdoor unit 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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