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10-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to
11-6-1.)
Jumper wire
Defrost fi nish temperature (°C)
MUZ-GE
25VA 33VA
35VA
35VA2
42VA
50VA
50VA2
60VA
60VAD
71VA
71VAD
80VA
80VA2
80VAD
JS
Soldered (Initial setting) 5 10 10 5 9 10 10 10
None (Cut) 8 13 13 10 18 18 18 18
MUZ-GE25/35/42/50VAD do not have this changing function. The defrost finish temperature is fixed to the temperatures
shown in the table below. The JS wire for these models is used for changing the demand response capability.
Defrost fi nish temperature (°C)
MUZ-GE
25VAD 35VAD 42VAD 50VAD
5105 9
10-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
MUZ-GE25/33/35/42/50
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature.
The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature thermis-
tor is 20°C or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)
MUZ-GE60/71/80
Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature (0°C or less)
may cause the following troubles. To prevent those troubles, activate the pre-heat control.
1) If moisture gets into the refrigerant cycle and freezes, it may interfer the start-up of the compressor.
2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur.
The pre-heat control turns ON when the compressor temperature is 20°C or below. When the pre-heat control turns ON,
the compressor is energized. (About 70 W)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board.
(Refer to 11-6.1)
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
SERVICE FUNCTIONS
10
MUZ-GE25VA MUZ-GE25VAD MUZ-GE33VA MUZ-GE35VA MUZ-GE35VA2 MUZ-GE35VAD
MUZ-GE42VA MUZ-GE42VAD MUZ-GE50VA MUZ-GE50VA2 MUZ-GE50VAD
MUZ-GE60VA MUZ-GE60VAD MUZ-GE71VA MUZ-GE71VAD
MUZ-GE80VA MUZ-GE80VA2 MUZ-GE80VAD
OBH532E