Mitsubishi Electric SUZ-KA25VA2, Техническое и сервисное руководство

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44
When unit cannot operate neither by the remote controller.
Indoor unit does not operate.
Outdoor unit does not operate.
[SUZ-KA60VA2.TH]
Is serial signal
error indicated
6 minutes later?
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press TEST button twice.
· Reinstall the
unit away from
inverter-contro
lled lighting
equipment.
· Attach a filter
on receiving
section of the
indoor unit.
Yes
B
A
Is there rated voltage in the
power supply?
Is there any mis
wiring, poor contact,
or wire disconnection
of the indoor/outdoor
connecting wire?
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
Serial signal error display
As for indoor unit.
Turn OFF the power supply.
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Does the left lamp of OPERATION INDICATOR
lamp on remote controller light up?
<Confirmation of the power to the indoor unit>
Press TEST button twice.
Check the power
supply.
Is the self-check of the remote controller
displayed 6 minutes after?
The left lamp of
OPERATION INDICATOR
lamp blinks.
A
Check the wiring.
Make them sure.
Outdoor electronic control P.C. board
Blinking
(Parts side)
LED2 LED1
1. Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
3. Be sure to check this within 3 minutes after turning
ON. After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after 3 minutes.
(Lighted
or OFF)
No
Yes
No
Yes
2 Be careful of the residual
voltage of smoothing capacitor.
Be sure to release the failure-mode
recall function after checking.
Yes
Yes
No
Yes
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not mis-wiring.
Short-circuit outdoor terminal block is S2
and S3.
1
B
Turn ON the power supply.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
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.
Replace the inverter P.C. board
or the outdoor electronic 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?
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?
No
Replace the
indoor/outdoor
connecting wire.
Replace the
indoor/outdoor
connecting wire.
No
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-second-
quick blinking"?
3
How to check miswiring and serial signal error (when outdoor unit does not work)
(For wired remote controller use model)
O