44
CAUTION
Use a cylinder designed for use with
R410A respectively.
Charging additional refrigerant
●
Charging additional refrigerant (calculated from the liquid
tube length as shown in the section “1-8. Additional
Refrigerant Charge”) using the liquid tube service valve.
●
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 refrigerant charge connection port with
the system in cooling operation mode at the time of test run.
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.
CAUTION
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).
(3) Loosen the charge hose connected to the gas tube service
port (1/4 in.) slightly to release the pressure, then remove
the hose.
(4) Replace the 1/4 in. flare nut and its bonnet on the gas
tube service port and fasten the flare nut 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 and liquid service valves
and fasten them securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready for a test run.
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