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Multi Split Type Air Conditioner / User Manual
6 Air evacuation
6�1 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 refrigerant circuit,
removing any non-condensable gas and moisture
from the system.
Evacuation should be performed upon initial
installation and when unit is relocated.
6�1�1 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.
6�1�2 Evacuation instructions
Before using a manifold gauge and a vacuum
pump, read their operation manuals to make sure
you know how to use them properly.
Manifold Gauge
Compound
gauge
-76cmHg
Low pressure
valve
High pressure
valve
Pressure hose /
Charge hose
Charge hose
V
acuum
pump
Pressure gauge
Low pressure valve
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
Pressure hose / Charge hose
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
Low pressure valve
1. Connect the manifold gauge’s charge hose
to the service port on the outdoor unit’s low
pressure valve.
2. Connect the manifold gauge’s charge hose
from the 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 the Compound Meter reads -76cmHG
(-1x105Pa).
6. Close the manifold gauge’s Low Pressure valve
and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has
been no change in system pressure.
C
If there is no change in system
pressure, unscrew the cap from
the packed valve (high pressure
valve). If there is a change in
system pressure, there may be
a gas leak.
8. Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve by
turning the wrench 1/4 counterclockwise.
Listen for gas to exit the system, then close the
valve after 5 seconds.
Flare nut
Cap
valve body
valve stem
Flare nut
Cap
Valve stem
Valve body
9. Watch the Pressure Gauge for one minute to
make sure that there is no change in pres-
sure. It should read slightly higher than the
atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the
high pressure and low pressure valves.