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12.5.9 Proper Pump Down Method
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.
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.
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