Sharp R-426H Service Manual download pdf (Page 140)

4. Service procedures

IV-3

(1)-1 Check before and after Troubleshooting (AER 425 SHLE)

Many problems may happen because of wiring or power supply problems, so you should

check these areas first. Problems here can cause false results in some of the other tests,

and so should be corrected first.

1. Check power supply wiring

❑ Check the power supply wires are correctly connected between terminal

No. 1 & 2 on the 3P terminal plates in the indoor unit and the outdoor unit.

2. Check inter-unit wiring

❑ Check that inter-unit control wiring (DC low voltage) is correctly connected

between the indoor unit and outdoor unit.

Power Supply: 50 Hz, single-phase, 220-230-240 V

3. Check power supply

❑ Check that voltage is within the specified range (±10% of the rating).

❑ Check that power is being supplied.

If the following troubleshooting must be done with power being supplied,

be careful not to touch any uninsulated live part that can cause ELECTRIC

SHOCK.

4. Check the lead wires and connectors in indoor and outdoor units.

❑ Check that the sheath of lead wires is not damaged.

❑ Check that the lead wires are firmly connected at the terminal plate.

❑ Check that the wiring is correct.

Fig. 22

Indoor Unit

Inter-unit

power wiring

(Line voltage)

Inter-unit

control wiring

(Low voltage)

RED

WHT

BLK

Remote controller

Outdoor Unit

Ground

0500_M_I

Power supply

R.C. Address on the PCB: 0 (S2, BLK)

(0: Factory shipped state)

220 - 240 V 50 Hz

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Sharp R-426H Service Manual Page 140