Panasonic U-20ME1E81, Руководство по обслуживанию

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2WAY SYSTEM
Control Functions
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Outdoor Unit
1 - 36
1
11. Alarm Information
11-5. 4-way valve failure
If the maximum heat exchanger temperature of the outdoor unit that operates heating mode is 20°C or higher
than the ambient temperature and this condition continues for 15 minutes, it is possible that the 4way-valve has
not changed during the heating operation.
The incidence of this situation is counted. When this counter reached 5 times, alarm occurs
4-way valve failure
Alarm display L18
11-6. Temperature Sensor Failure
When the temperature sensor fails or do not connect with PCB, “F” alarm occurs (excluding discharge
temperature sensor for compressor).
Alarm display
F06 EXG1 Gas temperature sensor in heat exchanger 1
F07 EXL1 Liquid temperature sensor in heat exchanger 1
F08 TO Ambient air temperature
F14 SCG Gas temperature in SC circuit
F23 EXG2 Gas temperature sensor in heat exchanger 2
F24 EXL2 Liquid temperature sensor in heat exchanger 2
H08 OIL1 Oil temperature sensor 1 (Inverter compressor)
H27 OIL2 Oil temperature sensor 2 (Constant speed compressor 1)
H28 OIL3 Oil temperature sensor 3 (Constant speed compressor 2)
F12 SCT Suction temperature
11-7. Magnet switch failure
The constant speed compressor cannot stop when the contacts of the magnet switch for compressor melt and
cannot cut out.
In this case, system compulsorily operates in cooling mode for safety.
All indoor units operate cooling mode and their fan mode is L (Low Speed).
The fan motor in the outdoor unit which magnet switch cannot cut off operates at maximum rotation speed.
* Inverter compressor and the other constant speed compressor which magnet switch is normal do not operate.
* The constant speed compressor contains an over load relay that detects abnormal temperature. Therefore,
there is no risk of danger.
12. 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.
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.
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.
12-1. Automatic Backup Operation
12-1-1. Alarms That Result in Automatic Backup Operation
Alarm list 1 (Backup operation continues unless power supply of all outdoor units is turned off.)
Over-current of compressor 1
Compressor 1 CT sensor disconnected or short-circuit
Over-current of compressor 2
Lock current of compressor 2
HIC trouble for compressor 1
Over-current of inverter device
Outdoor unit fan motor trouble
Malfunction of compressor 1 start
A
A
A
A
A
A
A
A
A
B
Over-current of compressor 3
Lock current of compressor 3
Alarm display
H03
H01
H11
H31
H12
H21
H22
P16
P29
P22
2WAY SYSTEM
Control Functions-Outdoor Unit
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.
SM830204-05_2WAY SYS.indb 36 2015/01/21 17:00:05