77 PB
R-410A SEALED SYSTEM REPAIR
Pumping Down
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
CLOSE
3-Way
valve
– Remove the valve stem caps and confirm that the valve stems
are in the raised position.
– Be sure to use a hexagonal wrench to operate the valve stems.
– Connect the charge hose with the push pin to the service port.
– Open the low-pressure valve on the charge set slightly to air
purge from the charge hose.
– Do this quickly so that the gauge ends up indicating 0-15 PSI.
– Tighten the service port nut.
– Be sure to check for gas leakage.
when the guage indicates 0 psi.
Fig. 505
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