9.
AIR EVACUATION
9.1
Safety Precautions
CAUTION
•
Use a vacuum pump with
a gauge reading lower than
-0.1MPa 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 -0.1MPa or below
after 2 hours. If after three hours
of operation and the gauge
reading is still above -0.1MPa,
check if there is a gas leak or
water inside the pipe. If there
is no leakage, perform another
evacuation for 1 or 2 hours.
•
DO NOT
use refrigerant gas
to evacuate the system.
9.2
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.
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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.
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.
NOTE:
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.
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Fig. 9.2
9.
Watch the Pressure Gauge for one
minute to make sure that there is no
change in pressure. 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.
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.
12.
Tighten valve caps by hand, then
tighten it using the proper tool.
Summary of Contents for EPF18V1O8
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