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Refrigerant Piping Connection
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.
Preparations and Precautions
Evacuation Instructions
Before using the manifold gauge and vacuum pump,
read their operation manuals to familiarize yourself
with how to use them properly.
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. 7.1
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.
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.
7
Air Evacuation
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