17-2. Outdoor Unit

17-2-1. Cautions in Service for Compressor

1. When checking the inverter output, remove the both wires of the compressor as follows.

17-2-2. How to Check Inverter Output

1.Turn off the power supply.

2.Remove the compressor lead from the compressor. (Be sure to remove lead wires of both compressors.)

3.Turn on the power supply and drive the air conditioner in cool or heat mode. In this case, be careful so that a fasten terminal of the compressor lead does not come to contact with other fasten terminal or you don’t touch other parts (Set cabinet).

4.Check the output voltage of the compressor lead at the inverter side.

If the result is not accepted by the following criteria, replace IPDU P.C. board.

No.

Measuring position

Criteria

 

 

 

1

Between Red and White

360V to 520V

 

 

 

2

Between White and Black

360V to 520V

 

 

 

3

Between Black and Red

360V to 520V

 

 

 

After check of output, sufficiently check there is no distortion on the fasten terminals when reconnecting the compressor lead to the compressor terminals. If any distortion is found, caulk the fasten terminal with pliers, etc. and then connect it.

<How to check resistance or compressor winding>

1.Turn off the power supply.

2.Remove the compressor lead from the compressor.

3.Using a tester, check the winding resistance between each phases of each compressor and resistance of the outdoor cabinet.

Is not grounded?

 

 

It is normal if there are 10M

or more.

Is not short-circuited between windings?

 

It is normal if there are 0.1

to 0.3. (Use a precise digital tester.)

17-2-3. How to Check Outdoor Fan Motor

1.Turn off the power supply.

2.Remove three fasten terminals (U, V, W) of the fan motor from IPDU P.C. board for the outdoor fan.

3.Turn the fan with hands. If it is not turned, a fan motor error (Lock) is considered. Replace the fan motor with

a new one. When it is turned, measure the winding resistance between each phases of the fasten terminal (motor winding) with a tester. It is normal if the winding resistance between phases are 13 to 33.

(Use a precise digital tester.)

Part name

 

Procedure

 

Outdoor fan motor

Measure resistance of each winding with a tester.

 

 

Red

U

 

 

 

Position

Resistance

 

 

Red-White

13~33

 

 

Black-Red

13~33

 

 

White-Black

13~33

 

White

Black

(Normal temp.)

 

V

W

 

222

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Toshiba MMU-AP0091H service manual How to Check Inverter Output, How to Check Outdoor Fan Motor, 222, Part name Procedure