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Air and foreign matter in the refrigerant circuit can
cause abnormal rises in pressure, which can dam-
age 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 using the manifold gauge and vacuum
pump, read their operation manuals to familiarize
yourself with how to use them properly.
•
Check to make sure that both highpressure and
low-pressure pipes between the indoor and
outdoor units are connected properly in accord-
ance with the Refrigerant Piping Connection
section of this manual.
•
Check to make sure all wiring is connected
properly.
PREPARATIONS AND PRECAUTIONS
EVACUATION INSTRUCTIONS
BEFORE PERFORMING EVACUATION
AIR EVACUATION
fig 6.1
Manifold Gauge
Compound gauge
Low pressure valve
-76cmHg
Charge hose
Charge hose
Low pressure valve
Pressure hose /
Vacuum pump
High pressure valve
Pressure gauge
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