Goodman MSG-12CRN1N Service Instructions Manual page 15

SERVICE
Evacuation
WARNING
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause
property damage, personal injury or death.
1. Connect the vacuum pump to the gauge manifold's
center hose. Connect low pressure gauge hose to gas
side of outside unit. Open low side manifold gauge valve
only.
2. Evacuate for approximately one hour to 500 microns.
Micron Gauge
3. Close the valve (low side) on the charge set. Turn off the
vacuum pump and make sure the micron gauge does not
go above 1,000 microns in approximately 5 minutes after
turning off the vacuum pump.
4. Disconnect the charge hose from the vacuum pump.
If the vacuum pump oil becomes dirty or depleted,
replenish as needed.
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