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C Checking the compressor
Check the resistance
of compressor
Between one
and dozens of ohms?
Yes
Check the operation
time
Continuous
operation?
Yes
Normal
D Checking the compressor winding
Disconnect the lead wires and check the resistance between the compressor terminals.
<Measuring points>
Measure the AC voltages at the following three points on the transistor module.
BLK - WHT
BLK - RED
WHT - RED
<Judgment>
1.05 ~ 1.29Ω (MXZ-18NV), 0.47 ~ 0.58Ω (MXZ-32NV) at -10 °C ~ 40 °C of
winding temperature.
Zero (Ω) : Faulty (Short)
Infinite (Ω) : Faulty (Open)
NOTE 1 : Be sure to zero the tester before measurement.
NOTE 2 : The winding resistance is 1.2Ω(MXZ-18NV),0.54Ω(MXZ-32NV)
at 20°C for each phase.
E Checking the compressor operation
• Connect the compressor, activate the inverter, and count time until the inverter stops due to overcurrent.
<Operating method>
Perform the test run in the cooling or heating mode by using the emergency run switch on the indoor unit.
<Measuring point>
Count time from when the outdoor fan starts up until the inverter stops due to overcurrent.
<Judgment>
Inverter stops in 0 to 10 seconds : Faulty (Short)
Inverter stops in 10 to 60 seconds : Faulty (Compressor lock)
Inverter stops in 60 seconds to 5 minutes : Faulty (Refrigerant circuit defective)
Inverter operates for 5 minutes or more : Normal
Proceed to D D for checking the compressor winding.
Compressor
short / open circulit
No
Proceed to E E for checking the compressor operation.
Compressor
layer-short or
lock.Refrigerant
No
circuit defective.
Replace the compressor.
Replace the compressor.
Check the refrigerant circuit.
Tester indication
X1
X1
X1
0 sec.
10sec.
60sec.
5 min.
Normal
(One to dozens of ohms)
Faulty
(Zero ohms or short)
Faulty
(Infinite or open)
Outdoor fan start-up
Faulty (Compressor sfort or luyer-short)
Faulty (Compressor lock. etc.)
Faulty (Refrigerant circuit
defective,etc.)
Normal
45
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