12KHR-N
3 – 11
1. Checking procedures
No
.
Item Check method Normal value/condition Remedy
1 Preparation Disconnect compressor cords (white,
orange, red: 3 wires) from compres-
sor 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 Fas-
ten 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 20qC --- 0.65:Correct connections at compres-
sor terminals.
Replace compressor.
5 Expansion valve check Measure expansion valve coil resis-
tance.
Each phase 46r3: (at 20qC) 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).
To Next Page
Loading...
Need help?
General
