Service Functions - Mitsubishi Electric MUZ-HJ25VA-E2 Service Manual

10

SERVICE FUNCTIONS

MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA
10-1. CHANGE IN DEFROST SETTING
<JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to
11-6-1.)
Jumper wire
Soldered
(Initial setting)
JS
None (Cut)
10-2. 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 thermis-
tor is 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.
OFF: To deactivate the pre-heat control, solder the 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.
OBH648F
Defrost fi nish temperature (°C)
MUZ-HJ25/35VA MUZ-HJ50VA
8
11
MUZ-HJ60/71VA
10
15 18
35