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13. PUMP DOWN
Pump down means collecting all refrigerant gas in the
system back into the outdoor unit without losing ant of
the gas. Pump down is used when the unit is to be
moved or before servicing the refrigerant circuit.
Pump down procedure
Be sure to carry out pump
down with the unit in cooling
mode.
(1) Connect the low pressure side (wide tube valve
service port) charging hose of the manifold valve
to the service port (B) on the wide tube service
valve.
(2) Using a hex wrench, turn the narrow tube service
valve clockwise all the way to close the service
valve.
(3) Press the operation button and start cooling
operation.
(4) When the low pressure gauge reading falls to
14.2 to 7.1 psi (1 to 0.5 kg/cm
2
), fully close the
wide tube valve stem with a standard screwdriver.
Then quickly stop the unit.
(5) Disconnect all gauges and hoses, and replace
the bonnets and the valve caps as they were
previously.
(6) Purge all air remaining inside the tubing before
operating the air conditioner.
CAUTION