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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 -76 cm
HG (-10 Pa).
6. Close the low pressure side of the manifold
gauge, and turn off the vacuum pump.
7. Wait 5 minutes, then check that there has
been no change in system pressure.
8. If there is a change in system pressure, re-
fer to the Gas Leak Check section for infor-
mation on how to check for leaks. If there
were no changes in the system pressure,
unscrew the cap from the packed valve
(high pressure valve).
9. Insert hexagonal wrench into the packed
valve (high pressure valve) and open the
valve by turning the wrench counterclock-
wise 1/4 turn. Listen for gas to exit the
system, then close the valve after 5 sec-
onds.
Flare Nut
Valve Body
Valve Stem
10. 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 atmo-
spheric pressure.
11. Remove the charge hose from the service
port.
12. Using an hexagonal wrench, fully open
both the high pressure and low pressure
valves.
13. Tighten by hand valve caps on all three
valves (service port, high pressure and low
pressure). You may tighten further using a
torque wrench if needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexago-
nal wrench until it hits against the stopper.
Do not try to force the valve to open it fur-
ther.
Note on Adding Refrigerant
Some systems require additional charging
depending on pipe length. The standard pipe
length varies according to local regulations.
For example, in North America the standard
pipe length is 7.5 m (25 ft). In other areas, the
standard pipe length is 5 m (16 ft). The addi-
tional refrigerant to be charged can be cal-
culated using the formula shown in the next
chart:
Cap
Fig. 6.2
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