Technibel CAFM1V Series Technical Data Manual page 66

1. Air Purging
CAUTION
Charging additional refrigerant
Charging additional refrigerant (calculated from the

liquid tube length as shown in Section 2. 2-7 "Addi-
tional Refrigerant Charge") using the liquid tube
service valve. (Fig. 5-5)
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 gas tube service
valve with the system in cooling operation mode at
the time of test run. (Fig. 5-6)
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.
CAUTION
(3) Loosen the charge hose connected to the gas
4
tube service port (for ø7.94 mm tube) slightly to
release the pressure, then remove the hose.
(4) Replace the service port cap on the gas tube ser-
vice port and fasten the cap securely with an mon-
key spanner 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.
Use a cylinder designed for
use with R410A respectively.
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).
Manifold valve
Pressure
Lo
gauge
Gas
tube
Liquid
tube
Open
Gas
tube
Close
Liquid
tube
4 - 4
Test Run and Others
Hi
Valve
Liquid
R410A
Close
Close
Outdoor unit
Open
Close
Fig. 5-5
Open
Outdoor unit
Open
Fig. 5-6