D How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the

 

 

 

 

 

Check the power supply.

power supply?

No

 

 

 

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and

S2?No

Yes

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICA- TOR lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Check the wiring.

No

 

 

 

 

 

 

Is there any miswiring, poor

 

 

 

 

contact, or wire disconnec-

 

 

 

 

 

 

Correct them.

No

tion of the indoor/outdoor

Yes

 

 

 

 

connecting wire?

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

•Turn OFF inverter-controlled lighting equipment.

•Turn OFF the power supply and then turn ON again.

•Press EMERGENCY OPERATION switch.

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn OFF the power supply.

 

 

 

 

 

B

Check once more if the indoor/outdoor

 

1. Miswiring may damage indoor electronic control P.C.

connecting wire is not miswiring.

 

 

board during the operation.

 

 

Short-circuit outdoor terminal block S2

 

 

 

 

Be sure to confirm the wiring is correct before the opera-

 

 

and S3. 1

 

 

 

 

tion 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.

 

 

Turn ON the power supply.

 

board is normal, LED blinks 6 times after 3 minutes.

 

 

 

 

 

(Except for outdoor unit of multi system type)

 

 

 

 

 

 

 

 

 

Does the LED on the inverter P.C. board or

 

 

 

 

 

 

 

 

 

Replace the inverter P.C. board or

 

 

the outdoor electronic control P.C. board

 

 

 

 

 

 

 

 

the outdoor electronic control P.C. board.

 

 

repeat "3.6-second-OFF and 0.8-second-

 

No

 

 

 

 

 

2

 

 

ON quick blinking"? 3

 

(Lighted

 

 

 

 

 

 

 

 

 

 

Yes

 

or not

 

2. Be careful to the residual

 

 

 

 

 

 

 

 

 

lighted)

 

voltage of smoothing capacitor.

 

 

 

 

 

Turn OFF the power supply.

 

Is there any error of the in-

 

 

 

 

Remove the short-circuit between

 

 

 

 

 

outdoor terminal block S2 and S3.

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

Turn ON the power supply.

 

such as the damage of the wire,

 

 

 

outdoor connecting

No

Yes

Is there amplitude of 10 to 20 VDC

 

intermediate connection, poor

 

 

 

wire.

between outdoor terminal block S2 and

 

contact to the terminal block?

 

 

 

 

 

 

 

 

 

S3? <Confirmation of serial signal>

 

 

No

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Is there any error of the in-

 

 

 

 

Is there rated voltage between

 

 

 

 

 

 

 

 

 

 

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

Is serial signal error indicated 6 minutes later?

Yes

B

No

•Reinstall either the unit or the light each other away.

•Attach a filter on remote control receiving section of the indoor unit.

indoor terminal block S1 and S2?

No

such as the damage of the wire,

 

 

outdoor connecting

Yes

<Confirmation of power voltage>

 

intermediate connection, poor

 

 

wire.

 

Yes

 

contact to the terminal block?

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

21

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Logitech MSZ-A09NA, OB450 REVISED EDITION-B service manual How to check miswiring and serial signal error
Page 20 Page 22

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