Mitsubishi SUZ-KA35VA Service Manual page 85

When cooling, heat exchanger of non-operating indoor unit frosts.
When heating, non-operating indoor unit get warm.
Check of LEV
T
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
No
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
No
Replace the LEV coil.
When heating, room does not get warm.
When cooling, room does not get cool.
How to check inverter/ compressor
U
Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is voltage output on right table?
Yes
No
Is output balanced?
Yes
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
Yes
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is the resistance between each terminal normal?
Yes
Reconnect the lead wire of compressor, and turn on
power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
OC322G
LED display:
LED1
Lighting
6 time
Yes
• After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
• The output voltage values have the tolerance of 20%.
No
No
Replace the power board.
No
85
[SUZ-KA50/60/71VA
LED2
Lighting
Goes out
Yes
Normal
Replace the outdoor electronic
control P.C. board.
LED display:
LED1
Lighting
Lighting
Twice
Replace the
compressor.
.TH SUZ-KA60VAR2.TH]
(1)
LED2
Lighting
Twice
Goes out
COOL HEAT
150V 170V
(48Hz) (64Hz)