Service Functions; Change In Defrost Setting; Pre-Heat Control Setting - Mitsubishi Electric MUZ-GE09NA Service Manual

9

SERVICE FUNCTIONS

MUZ-GE09NA
MUZ-GE09NA2
MUZ-GE09NAH
MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2
MUY-GE09NA
MUY-GE09NA2
9-1. CHANGE IN DEFROST SETTING (MUZ)
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

PRE-HEAT CONTROL
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 thermistor
is 68°F (20°C) or below. When pre-heat control turns ON, 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. (Refer to 10-6.1.)
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board. (Refer to 10-6.1.)
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
OBH549F
MUZ-GE12NA MUZ-GE15NA
MUZ-GE12NA2 MUZ-GE15NA2
MUZ-GE12NAH MUZ-GE15NAH
MUY-GE12NA MUY-GE15NA
MUY-GE12NA2 MUY-GE15NA2
MUZ-GE09 MUZ-GE12
41°F (5°C) 50°F (10°C)
46°F (8°C) 55°F (13°C)
MUZ-GE18NA
MUZ-GE18NAH
MUY-GE18NA
Defrost fi nish temperature
MUZ-GE15
41°F (5°C)
50°F (10°C)
43
MUZ-GE24NA
MUY-GE24NA
MUZ-GE18 MUZ-GE18/24
48°F (9°C) 50°F (10°C)
64°F (18°C) 64°F (18°C)