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12.4.8 Proper Pump Down Method
Most Important Process
Purpose: To make the oil
& refrigerant mix together.
They are in separated
condition when
air conditioner
is stopped.
Mixed refrigerant &
oil will be collected
into outdoor unit.
Only very small
amount of oil remain
inside piping, which
is acceptable.
1
Operate air
conditioner at
cooling mode for
10 ~ 15 minutes.
2
After 10 ~ 15 minutes of pre
operation, close 2 way valve.
After 3 minutes, close 3 way
valve.
3
Take out air
conditioner unit.
4
Install New
Refrigerant air
conditioner.
