Mitsubishi Electric MUFZ-KJ-NAHZ Series, Руководство по обслуживанию

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33
(Lighted
or
not lighted)
No
Yes
No
Be sure to release the failure-mode
recall function after checking.
Yes
Yes
No
Yes
LED indication
for communication status
Communication status is indicated
by the LED.
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
15 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
Unit status
Outdoor control P.C. board
LED1 LED2 LED3
LED 1 LED 3 LED 2
Pattern
1
2
3
Unit B
status
Unit C
status
Unit A
status
Unit D
status
Unit E
status
Not lighted
Lighted
Blinking
Turn ON the power supply.
C
Turn OFF the power supply.
Remove the bridge between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor electronic control P.C. board.
2 Be careful of the residual
voltage of smoothing capacitor.
Replace the outdoor control P.C. board.
2
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Replace the
indoor/outdoor
connecting wire.
No
Does the LED on the outdoor control P.C.
board repeat "3.6-second-OFF
and 0.8-second-ON quick blinking"?
Blinking
2%+%