Air Evacuation - Midea MSAG-10CRN8 User Manual

Air Evacuation

:
NOTE 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 e ciency, 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
 Make sure the connective pipes between the indoor and outdoor units are connected properly.
 Check to make sure all wiring is connected properly.
Evacuation Instructions
Indoor unit
Outdoor unit
Pressure hose
Charge hose
Low pressure
Manifold
valve
-76cmHg
Compound Pressure
gauge gauge
Low
High
pressure
pressure
valve
valve
or
Charge
hose
valve
Step 1：
Connect the charge hose of the manifold
●
gauge to service port on the outdoor unit's
low pressure valve.
Connect another charge hose from the
●
manifold gauge to the vacuum pump.
Open the Low Pressure side of the manifold
●
gauge. Keep the High Pressure side closed.
Turn on the vacuum pump to evacuate the
●
system.
Run the vacuum for at least 15 minutes, or
●
until the Compound Meter reads -76cmHG
(-10 Pa).
Close the Low Pressure side of the manifold
●
gauge, and turn o the vacuum pump.
Wait for 5 minutes, then check that there
●
has been no change in system pressure.
Vacuum
pump
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