32
Fig. 6-5
Fig. 6-6
Charging additional refrigerant
● Charging additional refrigerant (calculated from the
liquid tube length as shown in Section 1-7
“Additional Refrigerant Charge”) using the liquid
tube service valve. (Fig. 6-5)
● Use a balance to measure the refrigerant accurately.
● If the additional refrigerant charge amount cannot
be charged at once, charge the remaining
refrigerant in liquid form by using the gas tube
service valve with the system in cooling operation
mode at the time of test run. (Fig. 6-6)
Finishing the job
(1) With a hex wrench, turn the liquid tube service
valve stem counter-clockwise to fully open the
valve.
(2) Turn the gas tube service valve stem
counter-clockwise to fully open the valve.
(3) Loosen the charge hose connected to the gas
tube service port (for ø5/16" tube) slightly to
release the pressure, then remove the hose.
(4) Replace the service port cap on the gas tube
service port and fasten the cap securely with an
adjustable wrench or box wrench.This process is
very important to prevent gas from leaking from
the system.
(5) Replace the valve caps at both gas tube and liquid
tube service valves and fasten them securely.
This completes air purging with a vacuum pump. The
air conditioner is now ready for a test run.
To avoid gas from leaking when
removing the charge hose,
make sure the stem of the gas
tube is turned all the way out
(“BACK SEAT”position).
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