22 Room Air Conditioner
Test Running
PUMP DOWN
This is performed when the unit is to be
relocated or the refrigerant circuit is
serviced.
Pump Down means collecting all refrigerant in
the outdoor unit without loss in refrigerant gas.
CAUTION: Be sure to perform
Pump Down procedure with the
unit cooling mode.
Pump Down Procedure
1. Connect a low-pressure gauge manifold hose
to the charge port on the gas side service
valve.
2. Open the gas side service valve halfway and
purge the air from the manifold hose using the
refrigerant gas.
3. Close the liquid side service valve(all the way
in).
4. Turn on the unit's operating switch and start the
cooling operation.
5. When the low-pressure gauge reading
becomes 1 to 0.5kg/cm
2
G(14.2 to 7.1 P.S.I.G.),
fully close the gas side valve stem and then
quickly turn off the unit. At that time, Pump
Down has been completed and all refrigerant
gas will have been collected in the outdoor unit.
Discharge
temperature
Discharge air
Intake temperature
