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Use a cylinder designed for use with
CAUTION
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 gas tube service valve with the system in
cooling operation mode at the time of test run.
Finishing the job
(1) With a hexagonal wrench, turn the liquid tube service valve
stem counter-clockwise to fully open the valve.
(2) With a hexagonal wrench, turn the gas tube service valve
stem counter-clockwise to fully open the valve.
To avoid gas from leaking when
removing the charge hose, make sure
CAUTION
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.
Manifold valve
Pressure
gauge
Gas
tube
Liquid
tube
Gas
tube
Liquid
tube
41
Lo
Hi
R410A
Close
Close
Open
Close
Open
Open
Close
Open
Valve
Liquid
Outdoor unit
Outdoor unit
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