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5. Pump Down
5-1. What is Pump Down?
Pump down means collecting all refrigerant gas in the
system back into the outdoor unit without losing any
gas. Pump down is used when the unit is to be moved
or before servicing the refrigerant circuit.
5-2. Pump Down Procedure
Be sure to carry out pump down with the unit in Cool-
ing mode.
(1) Connect the Lo side charging hose of the manifold
valve to the service port on the wide tube service
valve. (Fig. 39)
(2) Using a hex wrench, turn the narrow tube service
valve clockwise all the way to close the service
valve (Fig. 40). (Be sure to confirm that the wide
tube service valve is fully open.)
(3) Press the ON/OFF button and start cooling opera-
tion.
(4) When the low pressure gauge reading falls from 1
to 0.5 kg/cm
2
, fully close the wide tube valve stem
(Fig. 41). Then quickly stop the unit.
(5) Disconnect all gauges and hoses, and replace the
valve caps as they were before.
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