Multi-Zone Outdoor Condenser Installation Manual

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AIR EVACUATION

PREPARATIONS AND PRECAUTIONS

Air and foreign matter in the refrigerant system can cause abnormal rises in pressure, which can

damage the air conditioner, reduce energy efﬁciency, and cause injury. Use a vacuum pump and

manifold gauge to evacuate the refrigerant system, removing any non-condensible gas and

moisture from the system. Evacuation should be performed upon initial installation and if unit is

relocated.

BEFORE PERFORMING EVACUATION

1. Check to make sure the refrigerant pipes connecting the indoor and outdoor units are

connected properly.

2. Check to make sure all wiring is connected properly.

EVACUATION INSTRUCTIONS

1. Connect the low pressure side hose of the manifold gauge to the service port on the outdoor

unit’s low pressure valve.

2. Connect the hose from the auxiliary port of the gauge to the vacuum pump.

3. Open the low pressure side of the gauge. Keep the high pressure side closed.

4. Turn on the vacuum pump to evacuate the system.

5. Run the vacuum for at least 20 minutes and until the low pressure gauge holds at -30 PSI (500

microns).

6. Once the vacuum holds, close the low pressure side of the manifold gauge and turn off the

vacuum pump.

7. Wait 5 minutes, then check that there has been no change in pressure.

8. If there is a change in pressure, refer to the Gas Leak Check section for how to check for leaks.

9. If there is no change in pressure, remove the cap from the unit's high pressure valve.

10. Open the valve with a hex wrench by turning it 1/4 turn counterclockwise. Listen for the gas to

exit the condenser (approximately 5-10 seconds), then close the valve.

11. Watch the pressure gauge for 1 minute to make sure there is no change in pressure. The

pressure gauge should read slightly higher than atmospheric pressure.

12. Remove the hose from the service port.

13. Using the hex wrench, fully open both the high and low pressure valves on the unit. Open the

valves gently and until they reach their stopping point. Do not try to force the valves to open

further.

14. Replace all valve caps and tighten by hand.

Manifold Gauge

Low pressure

gauge

Low pressure

valve

High pressure

valve

Low pressure hose

Auxiliary hose

Vacuum pump

Low pressure valve

Flare nut

Cap

Valve body

Valve stem