Installation Service
11.PUMP DOWN
11.1What is Pump Down?
Pump down means collecting all refrigerant gas in system back into the outdoor unit without losing any of gas. Pump down is used when the unit is to be moved or before serving the refrigerant circuit.
11.2 Pump Down Procedure
NOTE Be sure to carry out pump down with the unit in cooling 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 operation.
4.When the low pressure gauge reading falls from 1 to 0.5 kg/cm2, 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.
Narrow tube
Hex wrench
Wide tube
Valve Cap
Vacuum hose to manifold valve
Fig. 41
Indoor unit
Outdoor unit
Manifold valve
Pressure |
|
gauge | Lo Hi |
|
Fig. 39
Narrow tube
Hex wrench
Wide tube
Valve Cap
Vacuum hose to manifold valve Fig. 40
34
