Mitsubishi FDT208HEN-S, Инструкция по эксплуатации

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FDTN-H
6.6 MAINTENANCE DATA
6.6.1 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 is very insoluble in water, even a small amount of moisture left in the refriger-
ant 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
pressure in the unit. If there is an internal
pressure, it should be relived through the
service port.
(b) Connect the charging hose of the gauge
manifold to the service port of the gas
piping.
Close high pressure valve
2
of gange
manifold.
(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.
h
Compond pressure gauge indicates -0.1 MPa (-76 cmHg)
h
Operate the vacuum pump for more than 10 minutes after -0.1MPa
(-76 cmHg) Hg is indicated.
h
Close low pressure valves
1
of gauge manifold.
h
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
connection 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