Panasonic U-8ME1E8E Service Manual page 47

13. Other Functions
13-2. Auto Change Over Function
It is able to select AUTO mode in each remort 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
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: B1
Setting No XX
0 Invalid (factory preset mode)
30 30
40 40
50 50
60 60
90 90
120 120
180 180
240 240
13-3. Function for Automatic Judgment of Insuffi cient 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 CHK pin on the No. 1 outdoor for 4 seconds or longer to engage this mode. (The LED on the
outdoor unit PCB 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.
Control Functions - Outdoor Unit
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2WAY SYSTEM