Panasonic U-8ME1E81 Service Manual page 50

13. Other Functions
13. Other Functions
13-2. Auto Change Over Function
It is able to select AUTO mode in each remote controller even in 2way system.
The system switches the mode cooling/heating according to number of thermo ON mode. The system selects the
mode that has more number of units with thermostat ON.
The system judges whether to switch the mode in XX minutes intervals.
If No. of thermostat ON indoor unit in cooling mode > No. of thermostat ON indoor unit in heating mode, system
selects cooling mode. The heating indoor units will be forced thermostat OFF.
1
1
If No. of thermostat ON indoor unit in cooling mode < No. of thermostat ON indoor unit in heating mode, system
selects heating mode. The cooling indoor units will be forced thermostat OFF.
* "XX" above is able to set in EEPROM of main outdoor unit
EEPROM setting in main outdoor unit
CODE: 27
Setting No.
0 Invalid (factory preset mode)
30
40
50
60
90
120
180
240
13-3. Function for Automatic Judgment of Insufficient Refrigerant Gas and Overcharge
This system includes a simple function for judging the amount of refrigerant.
13-3-1. Starting refrigerant level judgment mode
Short circuit the TEST pin for 4 seconds or longer while the compressor is running in the test run mode (keep
the CHK pin on the outdoor PCB short). The LED on the outdoor unit PCB begins blinking. Then open circuit.
* If the TEST pin is not open, judgment will not be started even though the LED begins blinking.
13-3-2. Conditions for amount of refrigerant judgment
After judgment mode starts, judgment occurs when all outdoor units in the system have been operating
continuously for 30 minutes or longer.
* Amount of refrigerant judgment requires that all outdoor units operate continuously for 30 minutes or longer.
This is in order to prevent incorrect adjustment of amount of refrigerant based on false detection caused by
refrigerant accumulation or recovery at stopped outdoor units, which is due to failures of functional elements.
After the judgment is displayed, repeated judgment will occur under new operating conditions if all outdoor units
continue operating. Therefore, the judgment display may change when later judgments occur.
* Judgment mode is automatically canceled after 4 hours.
XX
30
40
50
60
90
120
180
240
Control Functions-Outdoor Unit Control Functions - Outdoor Unit
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2WAY SYSTEM
2WAY SYSTEM