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12-2. Refrigerant recovery
12-2-1.
Open the service valve to recover refrigerant into
refrigerant recovery unit.
CAUTION
Refrigerant released into the air contributes to
destruction of our planet's ozone layer. You
should always use the refrigerant recovery unit
to help protect the environment.
12-3. Service on outdoor unit
12-3-1.
After making sure that the refrigerant in the
circuit has been completely discharged, perform
the required servicing, such as replacing the
compressor or repairing refrigerant leaks.
12-3-2.
Before going on to the next step, leak test all
joints where welding has been done.
NOTE
Nitrogen gas is best when pressurizing the system
for a leak test. However, if it is necessary to instead
test with refrigerant gas, be sure to recover all gas
into the refrigerant recovery unit after completing
the leak test.
12-4. Evacuation using vacuum pump
12-4-1.
Using a hex wrench, set the valve stems of both
the narrow and wide tube service valves as
indicated in table below.
Service Valve
Unit A 1
Unit A2
NOTE
Refer to " Service Valve Construction "shown later
12-4-2.
Connect the vacuum pump and a manifold valve
as shown in Fig. 12-3.
Confirm that all connections are corr ect ly made.
NOTE
In order to withstand negative suction pressure
during evacuation, the manifold valve should be
equipped with a Hi / Lo compound gauge with a
minimum scale reading of - 76
Valve Position
Narrow
po si tio n -c-
Wide
Narrow
po si ti on -a-
Wide
cmHg.
IMPORTANT!
This procedure requires solenoid valves
opening during the operation. Follow the
steps of 12.1 before starting.
IMPORTANT!
This procedure requires solenoid valves
opening during the operation. Follow the
steps of 12.1 before starting.
51
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