Specifications
AES
99
Fig. 8-5
Fig. 8-6
The required time in the above table is calculated
based on the assumption that the ideal (or target)
vacuum condition is less than 667 Pa (–755 mm Hg,
5 Torr).
(2) When the desired vacuum is reached, close the
“Lo” knob of the manifold valve and turn off the
vacuum pump. Please confirm that the gauge
pressure is under 667 Pa (–755 mmHg, 5 Torr)
after 4 to 5 minutes of vacuum pump operation.
Charging additional refrigerant
● Charging additional refrigerant (calculated from the
narrow tube length as shown in Section 1-8 “Addi-
tional Refrigerant Charge”) using the narrow tube
service valve. (Fig. 8-5)
● Use a balance to measure the refrigerant accurately.
● If the additional refrigerant charge amount cannot
be charged at once, charge the remaining refriger-
ant in liquid form by using the wide tube service
valve with the system in cooling operation mode at
the time of test run. (Fig. 8-6)
Finishing the job
(1) With a hex wrench, turn the narrow tube service
valve stem counter-clockwise to fully open the
valve.
(2) Turn the wide tube service valve stem counter-
clockwise to fully open the valve.
(3) Loosen the charge hose connected to the wide
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
wide 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 wide and narrow
service valves and fasten them securely.
This completes air purging with a vacuum pump. The
air conditioner is now ready for a test run.
NOTE
CAUTION
Use a cylinder designed for
use with R410A respectively.
CAUTION
To avoid gas from leaking when
removing the charge hose,
make sure the stem of the wide
tube is turned all the way out
(“BACK SEAT” position.
Valve
Liquid
Manifold valve
Pressure
gauge
Lo Hi
Outdoor unit
Close
Close
Narrow
tube
Wide
tube
Balance
tube
Close
Open
Close
Close
R410A
Outdoor unit
Open
Close
Narrow
tube
Wide
tube
Balance
tube
Open
Close
Open
Open
04-396 InverterW_p51-108 ARGO 12/21/04 10:17 AM Page 99