Airwell AWAU-YCZ218-H11, Service Manual

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Re-installation while the outdoor unit need to be repaired
Installation 133
Be sure to check the gas leakage.
7. Re-installation while the outdoor unit need to be repaired
7.1. Evacuation for the whole system
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the opened position.
2). Connect the vacuum pump to 3-way valve’s service port.
3). Evacuation for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.
4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge
needle does not move (approximately 5 minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the vacuum pump.