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Charging additional refrigerant
Use a cylinder designed for use with
CAUTION
CAUTION
R410A respectively.
● Charging additional refrigerant (calculated from the liquid
tube length as shown in 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 hex wrench, turn the liquid tube service valve stem
counter-clockwise to fully open the valve.
To avoid gas from leaking when
CAUTION
removing the charge hose, make
CAUTION
sure the stem of the gas tube is
turned all the way out ("BACK
SEAT" position).
(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 (5/16" (7.94mm)) slightly to release the pressure, then
remove the hose.
(4) Replace the 1/4" (6.35mm) 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.
00_302411_EN.indd 39
Manifold valve
Pressure
gauge
Close
Gas
tube
Open
Liquid
tube
Close
Balance
tube
Open
Gas
tube
Close
Liquid
tube
Close
Balance
tube
39
Valve
Liquid
R410A
Close
Outdoor unit
Close
Close
Open
Outdoor unit
Open
Open
2018/7/4 13:27:51
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