Earth Leakage Breaker Activated - Mitsubishi Heavy Industries FDT71VNXWVH Service Manual

Hyper inverter packaged air-conditioners (split system, air to air heat pump type)

Table of Contents

Error code

None

Remote control:

1. Applicable model

2. Error detection method

3. Condition of error displayed

4. Presumable cause

• Defective compressor

• Noise

Note:

LED

Green

Red

Stays OFF Stays OFF

Indoor

Stays OFF Stays OFF

Outdoor

5. Troubleshooting

Diagnosis

Are OK the

insulation resistance and

resistance between terminals

(1)

compressor?

(1)0.722

YES

Is insulation

of respective harnesses OK?

Is any harness bitten between

pannel and casing

or etc?

YES

Check the outdoor unit grounding

wire/earth leakage breaker.

Check of the outdoor unit grounding wire/earth leakage breaker

Œ Run an independent grounding wire from the grounding screw

of outdoor unit to the grounding terminal on the distribution

panel. (Do not connect to another grounding wire.)

In order to prevent malfunction of the earth leakage breaker

itself, confirm that it is conformed to higher harmonic

regulation.

Insulation resistance of compressor

• Immediately after installation or when the unit has been left

for long time without power source, the insulation resistance

may drop to a few M

because of refrigerant migrated in

the compressor.

When the earth breaker is activated at lower insulation

resistance, check the following points.

Œ Check if the earth leakage breaker is conformed to higher

harmonic regulation or not.

Since the unit is equipped with inverter, it is necessary to use

components conformed to higher harmonic regulation in order

to prevent malfunction of earth leakage breaker.

Content