How to check miswiring and serial signal error

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-
	contact, or wire disconnec-			Correct them.
No	tion of the indoor/outdoor		Yes	Correct them.
No	tion of the indoor/outdoor		Yes
	connecting wire?
		No
		No

•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.		1. Miswiring may damage indoor electronic control P.C.
		connecting wire is not miswiring.		board during the operation.
		Short-circuit outdoor terminal block S2		board during the operation.
		Short-circuit outdoor terminal block S2		Be sure to conﬁrm the wiring is correct before the opera-
		and S3. 1		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
	Does the LED on the inverter P.C. board or				Replace the inverter P.C. board or
	the outdoor electronic control P.C. board				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	the outdoor electronic control P.C. board.
	repeat "3.6-second-OFF and 0.8-second-			No	2
	ON quick blinking"? 3			(Lighted	2
	ON quick blinking"? 3			(Lighted
			Yes	or not	2. Be careful to the residual
			Yes	or not	2. Be careful to the residual
				lighted)	voltage of smoothing capacitor.
				lighted)	voltage of smoothing capacitor.

Turn OFF the power supply.			Is there any error of the in-
Remove the short-circuit between			Is there any error of the in-
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
Turn ON the power supply.		No	such as the damage of the wire,		Yes	outdoor connecting
Is there amplitude of 10 to 20 VDC			intermediate connection, poor			wire.
between outdoor terminal block S2 and			contact to the terminal block?
between outdoor terminal block S2 and			contact to the terminal block?
S3? <Conﬁrmation of serial signal>				No
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

•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
indoor terminal block S1 and S2?		No	such as the damage of the wire,		Yes	outdoor connecting
<Conﬁrmation of power voltage>			intermediate connection, poor			wire.
	Yes		contact to the terminal block?
				No
				No

Replace the indoor electronic control P.C. board.

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

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