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Air Evacuation
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 efficiency, and
cause injury. Use a vacuum pump and
manifold gauge to evacuate the refrige-
rant circuit, removing any non-conden-
sable 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
outdoor units are connected properly.
Check to make sure all wiring is
connected properly.
Evacuation Instructions
Connect the charge hose of the
1.
manifold gauge to service port
on the outdoor unit's low
pressure valve.
Connect another charge hose
2.
from the manifold gauge to the
vacuum pump.
Open the Low Pressure side of
3.
the manifold gauge. Keep the
High Pressure side closed.
Turn on the vacuum pump to
4.
evacuate the system.
Run the vacuum for at least 15
5.
minutes, or until the
Compound Meter reads
-76cmHG (-10
Manifold Gauge
Compound
gauge
-76cmHg
Low pressure valve
Pressure hose /
Charge hose
Low pressure valve
the
indoor
Pa).
5
Pressure gauge
High pressure
valve
Charge hose
acuum
V
pump
Close the Low Pressure side of the
6.
manifold gauge, and turn off the
vacuum pump.
Wait for 5 minutes, then check that
7.
there has been no change in sys-
tem pressure.
If there is a change in system pres-
8.
sure, refer to Gas Leak Check sec-
tion for information on how to
check for leaks. If there is no
change in system pressure, un-
screw the cap from the packed
valve (high pressure valve).
Insert hexagonal wrench into the
9.
packed valve (high pressure valve)
and open the valve by turning the
wrench in a 1/4 counterclockwise
and
turn. Listen for gas to exit the
system, then close the valve after 5
seconds.
Watch the Pressure Gauge for one
10.
minute to make sure that there is
no change in pressure. The Pressure
Gauge should read slightly higher
than atmospheric pressure.
Remove the charge hose from the
11.
service port.
Using hexagonal wrench, fully
12.
open both the high pressure and
low pressure valves.
Tighten valve caps on all three
13.
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.
36
Flare nut
valve body
valve stem
Cap
V.1
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