Mitsubishi MXZ-32SV Service Manual download pdf (Page 31)

Check of LEV

Yes

Start

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?

Disconnect the connector

(CN791: unit A, CN792: unit B, CN793: unit C,

CN794: unit D), and measure the resistance of

LEV coil to check the integrity.

Nomal

Replace the electronic

control P. C. board

Replace the LEV coil.

Check of inverter/ compressor

Yes

Infinite

Yes

Infinite

Start

Disconnect the lead wire to the compressor at terminals, and turn on power supply to the indoor

and outdoor unit. Three minutes later, EMERGENCY OPERATION starts.

Is output balanced?

LED indicator the inverter

stops due to over current?

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

Measure the voltage between

each leading to the compressor.

U (BLK) - V (WHT)

V (WHT) - W (RED)

W (RED) - U (BLK)

Output voltage

COOL: 100V(58Hz) HEAT: 100V(58Hz)

Is voltage output? W1

Turn off power supply of indoor and outdoor unit,

and measure the compressor winding resistance

between the compressor terminals.

Is there resistance of 0.27" to 0.34" between

the each terminals?

Replace the electronic

control P. C. board

with the I.P.M P. C. board.

Return the lead wire of compressor to former, and

turn on power supply to indoor and outdoor unit.

Three minutes later EMERGENCY OPERATION starts.

1. Turn off power supply of the indoor

and outdoor unit, and disconnect

the connector CN 551 in the relay

P. C. board

2. Turn on power supply to the outdoor

unit, and after 1 minutes or more

passed, check the resistance

between the connector

CN551 pin 1 and pin 2.

Check the resistance

between each terminal

After 1 minutes has passed since the

power supply of outdoor unit was

turned off, disconnect the connector

CN 553 in the noise filter P. C. board.

Check the resistance

HPS (63H2).

Replace the

relay P. C. board.

Replace the

HPS (63H2).

Replace the

compressor.

W1 • After the outdoor fan starts running, wait for 1 minutes or more before

measuring the voltage.

• The output voltage values in the above table have the tolerance of i20%.

• When cooling, heat exchanger of non-operating indoor unit frosts.

• When heating, non-operating indoor unit get warm.

(LED display:

0000

pp11

)

• When heating, room does not get warm.

• When cooling, room does not get cool.

(LED display:

0000

aa88

)

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Mitsubishi MXZ-32SV Service Manual Page 31

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