Check Of Lev (Expansion Valve) - Mitsubishi Electric MUZ-FS06NA Service Manual

K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both Operation select button and
TEMP button on the remote controller at the same
time, press RESET button.
First, release RESET button.
Hold down the other 2 buttons for another 3 seconds.
Make sure that the indicators on the LCD screen
shown in the right figure are all displayed. Then re-
lease the buttons.
Press OFF/ON (stop/operate) button of the remote con-
troller (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
when touching it ?
No
Is LEV coil properly fixed to
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 10-4.)
No
Replace the LEV coil.
NOTE: After check of LEV, take the following steps.
1. Turn OFF the power supply and turn it ON again.
2. Press RESET button on the remote controller.
OBH873
1
*
OK
Yes
Properly fix 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.
1. Regardless of normal or abnormal condition, a short beep is
*
emitted once the signal is received.
Yes
39
Replace the inverter P.C.
No board.