Check Of Lev - Mitsubishi Electric Mr.Slim MUZ-GC25NA - C1 Service Manual

K Check of LEV (Expansion valve)
MUZ-GC25/35NA MUZ-GC50NA-
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except
the set temperature in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote
controller (the set temperature is displayed) with the
remote controller headed towards the indoor unit.
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
click·······"?
Do you feel the expansion valve vibrate
on touching it ?
No
Is LEV coil properly fi xed to
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 9-4.)
No
Replace the LEV coil.
NOTE : After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn ON it again.
2. Press RESET button on the remote controller.
MUZ-GC50NA- MUZ-GC60/71NA
C1
Turn ON power supply to the outdoor unit after checking
LEV coil is mounted to the LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Replace the LEV coil.
C2
1
OK
Yes
Properly fi x the LEV coil to the expansion valve.
No
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
Yes
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog
tester.
Replace the expansion valve.
No
No
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Yes
Normal
Yes
Replace the outdoor electronic control P.C. board.
Yes
43
Replace the inverter P.C.
No board.