Mitsubishi Heavy Industries FDC508HES3 Owner's Manual download pdf (Page 19)

8.6 MAINTENANCE DATA

8.6.1 Servicing

(1) Evacuation

The evacuation is a procedure to purge impurities, such as noncondensable gas, air, moisture from the refrigerant equipment by

using a vacuum pump. Since the refrigerant R22 and R407C is very insoluble in water, even a small amount of moisture left in the

refrigerant equipment will freeze, causing what is called ice clogging.

Evacuation procedure

Make sure that the both service valves of gas and liquid line are fully opened.

(a) Check to ensure that there is no internal pres-

sure in the unit. If there is an internal pres-

sure, it should be relived through the service

port.

(b) Connect the charging hose of the gauge mani-

fold to the service port of the gas piping.

Close high pressure valve 2 of gange mani-

fold.

(c)

Connect the charging hose A to a vecuum

pump.

Repeat evacuation in the following sequence.

Notes (1) Do not use the refrigerant pressure to expel air.

(2) Do not use the compressor for evacuation.

(3) Do not operate the compressor in a vacuum condition.

Start the vacuum pump.

Compond pressure gauge indicates -0.1 MPa (-76 cmHg)

Operate the vacuum pump for more than 10 minutes after -0.1MPa

(-76 cmHg) Hg is indicated.

Close low pressure valves 1 of gauge manifold.

Stop the vacuum pump.

Notes (1) Refer to the exterior-view drawing for the position

of the service valve.

(2) When connecting of the service valve, flare con-

nection for both the indoor and outdoor unit.

Outdoor unit

Flare connection

Indoor unit

Liquid line

Gas line

service port

Charging hose

Service hoses

Vacuum

pump

Gauge

manifold

Refrigerant

cylinder

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 33 34

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Mitsubishi Heavy Industries FDC508HES3 Owner's Manual Page 19

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