Outdoor Unit Check Method - IVT 09LR-N Service Manual

[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
1 Preparation
2 Inverter DC power supply
voltage check
3 IPM circuit check
4 Compressor check
5 Expansion valve check
6 Final check
Check method
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.
Measure DC voltage between IPM pins
(20) and (24).
Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
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).
Measure expansion valve coil resis-
tance.
Turn off power, and connect compres-
sor cords to compressor.
Operate air conditioner.
Measure DC voltage between IPM pins
(20) and (24).
Normal value/condition
320 VDC
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
Resistance value at 20C --- 0.65
Each phase 463 (at 20C)
Compressor should operate nor-
mally.
320 VDC or higher.
3 – 11
12LRN
Remedy
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.)
Replace control PWB.
Correct connections at compressor
terminals.
Replace compressor.
Replace expansion valve.
Replace control PWB.
Replace outdoor unit thermistor.
Replace compressor (in case of
compressor lock).