40
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 and
remove any incondensable gas and moisture from
the system. Evacuation should be performed upon
initial installation and when the unit is relocated.
Before Performing Evacuation
• Ensure the connective pipes between the
indoor and outdoor units are connected
properly .
• Ensure all wiring is connected properly.
Evacuation Instructions
1. Connect the charge hose of the manifold
gauge to the service port of the low pressure
valve on the outdoor unit.
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 until
Manifold Gauge
Compound Gauge
-76 cmHg
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 5 minutes before checking the system
pressure. If there is a change in system
pressure, refer to the “Gas Leak Check”
section to check for leaks. If there is no
change in system pressure, unscrew the cap
from the packed valve (high pressure valve).
8. Insert the hexagonal wrench into the
packed valve (high pressure valve) and open
the valve by turning the wrench in a 1/4
counterclockwise turn. Listen for gas to
exit the system, then close the valve after 5
seconds.
9. Watch the pressure gauge for one minute to
make sure that there is no change in pressure.
The pressure gauge should read slightly higher
than the atmospheric pressure.
10. Remove the charge hose from the service
port.
Flare Nut
Cap
Valve Body
Valve Stem
11. Use the hexagonal wrench to fully open both
the high pressure and low pressure valves.
12. 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.
To Next Page
Loading...
