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42
Air Evacuation
Preparations and Precautions
Air and foreign matter in the refrigerant circuit
can cause abnormal rises in pressure, which can
and cause injury. Use a vacuum pump and manifold
gauge to evacuate the refrigerant circuit, removing
any incondensable 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 the connective pipes
between the indoor and outdoor units are
connected properly .
• Check to make sure all wiring is connected
properly.
Evacuation Instructions
1. Connect the charge hose of the manifold
gauge to the service port on the outdoor unit’s
low pressure valve.
2. Connect another charge hose from the
manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the manifold
gauge. Keep the High Pressure side closed.
4. Turn on the vacuum pump to evacuate the
system.
5. Run the vacuum for at least 15 minutes, or
(-10 5Pa).
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
High pressure
valve
Pressure hose /
Charge hose
Charge hose
Vacuum
pump
Pressure gauge
Low pressure valve
6. Close the Low Pressure side of the manifold
gauge, and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has
been no change in system pressure.
8. If there is a change in system pressure, refer
to Gas Leak Check section for information on
how to check for leaks. If there is no change
in system pressure, unscrew the cap from the
packed valve (high pressure valve).
9. Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve by
turn. Listen for gas to exit the system, then
close the valve after 5 seconds.
10.
make sure that there is no change in pressure.
than atmospheric pressure.
11. Remove the charge hose from the service port.
Flare nut
Cap
valve body
valve stem
12. Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
13. Tighten valve caps on all three valves (service
port, high pressure, low pressure) by hand. You
may tighten it further using a torque wrench if
needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. Do not try
to force the valve to open further.
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