Specifications

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78
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6 MAINTENANCE DATA
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 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
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 -101 kPa (-755 mmHg)
h
Operate the vacuum pump for more than 10 minutes after -101 kPa
(-755 mmHg) 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.
For service port
Outdoor unit
Indoor unit
Liquid line
Gas line
Gauge
manifold
Service hoses
Vacuum
pump
3
1
Lo
2
Refrigerant
cylinder
Hi
Chaging hose A