12LRN
3 – 11
[7] OUTDOOR UNIT CHECK METHOD
After repairing the outdoor unit, conduct the following inspection procedures to make sure that it has been repaired completely. Then, operate the
compressor for a final operation check.
1. Checking procedures
No. Item Check method Normal value/condition Remedy
1 Preparation Disconnect compressor cords (white,
orange, red: 3 wires) from compressor
terminals, and connect simulated load
(lamp used as load).
Operate air conditioner in cooling or
heating test operation mode.
2 Inverter DC power supply
voltage check
Measure DC voltage between IPM pins
(20) and (24).
320 VDC Replace control PWB.
Replace diode bridge.
Correct soldered section of Fasten
tabs (BT1,2,5,6,10,11, JPL1,2,5,6)
on control PWB. (Repair solder
cracks.)
3 IPM circuit check Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
Replace control PWB.
4 Compressor check Measure compressor coil resistance
(for each phase of U, V and W).
Use multi-meter or digital tester capa-
ble of displaying two digits right of the
decimal point (0.01).
Resistance value at 20C --- 0.65 Correct connections at compressor
terminals.
Replace compressor.
5 Expansion valve check Measure expansion valve coil resis-
tance.
Each phase 463 (at 20C) Replace expansion valve.
6 Final check Turn off power, and connect compres-
sor cords to compressor.
Operate air conditioner.
Measure DC voltage between IPM pins
(20) and (24).
Compressor should operate nor-
mally.
320 VDC or higher.
Replace control PWB.
Replace outdoor unit thermistor.
Replace compressor (in case of
compressor lock).
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