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Purging the system with a vacuum pump
1. Check that each tube (both liquid and gas side tubes) between the indoor and
outdoor units have been properly connected and all wiring for the test run
has been completed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid and the gas side
service valves on the outdoor unit are kept closed at this stage.
2. When relocating the unit to another place, perform evacuation using vacuum
pump.
3. Oil trap should be installed every 16'-25' (no oil trap needed when outdoor
unit installed at a lower place than indoor unit).
4. Pipe length and refrigerant amount for single split type air conditioner.
(see tabel 2.2)
Outdoor unit
(A)
Indoor unit
Piping length under 16'
Cooling capacity
System
(BTU/h)
9000
Cooling Only
Cooling Only
12000
(B)
Table 2.2
Connective pipe
Max height
length (A)
difference (B)
25'~49'
16'
33'
25'~66'
Oil trap
Indoor unit
Piping length 16' or more
Additional amount of
Air purging
refrigerant to be charged
R410a: 0.16ozs/ft (Pipe length-25')
Use vacuum pump.
Use vacuum pump.
R410a: 0.16ozs/ft (Pipe length-25')
Purging the system
Outdoor unit
(A)
(B)
18
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