Service Functions; Muz-Jp09Wa - Mitsubishi Electric MUZ-JP09WA-U1 Service Manual

9

SERVICE FUNCTIONS

MUZ-JP09WA MUZ-JP12WA
9-1. 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 10-6.1.).
Jumper
Soldered
(Initial setting)
JS
None
(Cut)
9-2. PRE-HEAT CONTROL SETTING
When moisture gets into the refrigerant cycle, it may interfere with the start-up of the compressor at low outside tempera-
ture. The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature ther-
mistor is 68°F (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 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 10-6.1)
Jumper
Soldered
JK
Cut
NOTE: When the inverter P.C. board is replaced, check the jumper wires, and cut/solder them if necessary.
OBH821A
Defrost fi nish temperature
MUZ-JP09/12
50°F (10°C)
55.4°F (13°C)
Pre-heat control setting
Deactivated
(Factory setting)
Activated
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