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11
SERVICE FUNCTIONS
MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ
11-1. 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 12-6.1)
Jumper wire
Soldered (Initial setting)
JS
None (Cut)
11-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
When moisture gets into the refrigerant cycle, it may interfere the startup 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)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut the JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder the JK wire of the inverter P.C. board.
(Refer to 12-6.1)
NOTE: When the inverter P.C. board is replaced, check the jumper wires, and cut/solder them if necessary.
OBH865
Defrost finish temperature (°C)
MUZ-FT25/35VGHZ
5
10
28
MUZ-FT50VGHZ
10
18
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