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7.
Air Evacuation
Preparations and Precautions
Air and foreign matter in the refrigerant circuit can cause abnormal
rises in pressure, which can damage the air conditioner, reduce its
efficiency, and cause injury. Use a vacuum pump and manifold gauge to
evacuate the refrigerant circuit, removing any non-condensable gas
and moisture from the system.
Evacuation should be performed upon initial installation and when unit
is relocated.
BEFORE PERFORMING EVACUATION
Check to make sure that both high-pressure and low-pressure
pipes between the indoor and outdoor units are connected
properly in accordance with the Refrigerant Piping Connection
section of this manual.
Check to make sure all wiring is connected properly.
Installation Manual
Evacuation Instructions
Before using the manifold gauge and vacuum pump, read their operation
manuals to familiarize yourself with how to use them properly.
1. Connect the charge hose of the manifold gauge to service port on the
outdoor unit's low pressure valve.
2. Connect another charge hose from the manifold gauge to the vacuum
pump.
Air Evacuation | 29
Fig. 7.1
6 720 869 159 (2016/12)
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