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Safety Precautions
OcAUTION
• Use a vacuum pump with a gauge reading
lower than -0.lMPa and an air discharge
capacity above 40L / min.
• The outdoor unit does not need vacuuming.,
DO NOT open the outdoor unit's gas and
liquid stop valves.
• Ensure that the Compound Meter reads
-0.lMPa or below after 2 hours. lf after
three hours the gauge reading is still above
-0.lMPa, check if there is a gas leak or
water inside the pipe. lf there is no leak,
perform another evacuation for 1 or 2 hours.
, DO NOT use refrigerant gas to evacuate the
system.
Evacuation lnstructions
Before using a manifold gauge and a vacuum
pump, read their operation manuais to make
sure you know how to use them properly.
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
Fig. 9.1
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. O pen the Low-Pressureside of the manifold
gauge. Keep the High-Pressure side closed.
"
______________ _
_
Pressure gauge
High pressure valve
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
(-lxlOSPa).
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.
NOTE: lf there is no change in system pressure,
unscrew the cap from the packed valve (high
pressure valve). lf there is a change in system
pressure, there may be a gas leak.
8. lnsert 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
dose the valve after 5 seconds.
Valve body
Valve stem
9. Watch the Pressure Gauge for one minute to
make sure that there is no change in pressure. l t
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.
OPEN VALVE STEMS GENTL Y
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. DO NOT
try to force the valve to o pen further.
12. Tighten valve caps by hand, then tighten it
using the proper tool.
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Fig. 9.2
V.2
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