Cautions In Service For Compressor; How To Check Outdoor Fan Motor - Toshiba Super MMU-AP0091H Service Manual

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.
1
2
3
∗ 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>
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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 10MΩ or more.
• Is not short-circuited between windings?
→ It is normal if there are 0.1Ω to 0.3Ω. (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 33Ω.
(Use a precise digital tester.)
Part name
Outdoor fan motor Measure resistance of each winding with a tester.
Measuring position
Between Red and White
Between White and Black
Between Black and Red
Red U
White Black
V W
264
Criteria
360V to 520V
360V to 520V
360V to 520V
Procedure
Position Resistance
13~33Ω
Red-White
13~33Ω
Black-Red
13~33Ω
White-Black
(Normal temp.)