Mitsubishi Electric PKFY-P50VGM-A Service Manual download pdf (Page 2)

SAFETY PRECAUTION

[1] Cautions for service

· After recovering all the refrigerant in the unit, proceed to working.

· Do not release refrigerant in the air.

· After completing the repair service, recharge the cycle with the specified amount of liquid refrigerant.

Cautions for units utilizing refrigerant R407C

CAUTIONS RELATED TO NEW REFRIGERANT

Do not use the existing refrigerant piping.

The old refrigerant and lubricant in the existing piping

contain a large amount of chlorine which may cause the

lubricant deterioration of the new unit.

Use “low residual oil piping”

If there is a large amount of residual oil (hydraulic oil, etc.)

inside the piping and joints, deterioration of the lubricant

will result.

Use ESTR , ETHER or HAB as the lubricant to

coat flares and flange connection parts.

If large amount of mineral oil enters, that can cause

deterioration of refrigerant oil etc.

Use liquid refrigerant to charge the system.

If gas refrigerant is used to seal the system, the composition

of the refrigerant in the cylinder will change and performance

may drop.

Do not use a refrigerant other than R407C.

If another refrigerant (R22, etc.) is used, the chlorine in the

refrigerant may cause the lubricant deterioration.

Use a vacuum pump with a reverse flow check valve.

The vacuum pump oil may flow back into the refrigerant

cycle and cause the lubricant deterioration.

Store the piping to be used indoors during

installation and both ends sealed until just

before brazing.

(Store elbows and other joints in a plastic bag.)

If dust, dirt, or water enters the refrigerant cycle,

deterioration of the oil and compressor trouble may result.

Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a flame, poisonous gases will be released.

TECHNICAL CHANGES

PKFY-P32VHM-E PKFY-P32VHM-ER1

PKFY-P40VHM-E PKFY-P40VHM-ER1

PKFY-P50VHM-E PKFY-P50VHM-ER1

1. INDOOR CONTROLLER BOARD (I.B.) has been changed. (S/W version up)

2. Fan speed has been changed. (4 speed → 3 speed)

3. Heat exchanger has been changed.

PKFY-P32VHM-E

PKFY-P40VHM-E

PKFY-P50VHM-E

Service parts of room temp. thermistor (TH21) has been changed. (T7W E05 202 → R01 N20 202)

(The position to be attached has been changed. Band/PVC tube have been added.)

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Mitsubishi Electric PKFY-P50VGM-A Service Manual Page 2

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