Leak Testing; Attach Hoses To The Unit And Vacuum Pump; Zero Charging Scale - Gree Neo GWH09MA-A3DNA3A Installation, Service & Troubleshooting

2. Leak Testing

Follow the procedures for leak testing with nitrogen
prior to adding charge on a new installation or existing
one suspected for leaks. See preceding page.

3. Attach hoses to the unit and vacuum pump

5/16" x 1/4" adapter may be required to connect hose
to port.
Check to insure that the liquid and gas valves are closed
on the unit. Close all valves on your gauge set, then
connect the vacuum pump to your gauge set. Pump
down lineset and indoor unit.

4. Zero charging scale

Place the refrigerant tank on the charging scale. Open
the tank valve, turn on the scale, then zero the scale.
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Refrigerant Charging Procedure