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Air Purge
Preparation and Precautions
Air and foreign matter in the refrigerant cir-
cuit can cause abnormal rise in pressure,
which can damage the air conditioner, re-
duce its efficiency, and cause injuries. Use a
vacuum pump and manifold gauge to purge
the refrigerant circuit, removing any non-
condensable gas and moisture from the sys-
tem.
Air purge should be performed upon initial
installation and when unit is relocated.
Before performing the air purge
• Check to make sure that both, high pres-
sure and low-pressure pipes between the
indoor and outdoor units are connected
properly in accordance with the Refriger-
ant Piping Connection section of this
manual.
• Check to make sure all wiring is properly
connected.
118
Air Purging 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 the service port on the outdoor
unit's low pressure valve.
2. Connect other charge hose from the mani-
fold gauge to the vacuum pump.
3. Open the Low Pressure side of the mani-
fold gauge. Keep the High Pressure side
closed.
Fig. 6.1
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