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Air Evacuation
7
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.
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.
MC MC
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
High pressure
valve
Pressure hose /
Charge hose
Charge hose
Vacuum
pump
Pressure gauge
Low pressure valve
Fig. 6.1
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