Zhendre SMC12BV Notice D'installation page 40

SOAP WATER METHOD
(1) Remove the caps from the 2-way and 3-way-
valves.
(2) Remove the service-port cap from the 3-way
valve.
(3) To open the 2-way valve turn the valve stem
counterclockwise approximately 90°, wait for
about 2-3 sec, and close it.
(4) Apply a soap water or a liquid neutral detergent
on the indoor unit connection or outdoor unit
connections by a soft brush to check for leakage
of the connecting points of the piping.
(5) If bubbles come out, the pipes have leakage.
C: EVACUATION
• Connect the charge hose end described in the
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit. Confirm the "to"
knob of the manifold valve is open. Then, run the
vacuum pump. The operation time for evacuation
varies with tubing length and capacity of the
pump. The following table shows the time
required for evacuation.
Required time for evacuation when 30 gal/h vacuum pump is used
If tubing length is less
than 10 m (33 ft)
10 mm. or more
!
WA R N I N G :
For new refrigerant (R407C, R410A), vacuum
level shall be ≤ 10
-2 mbar.
D: FINISHING THE JOB
• With a service valve wrench, turn the valve stem
of liquid side valve counter-clockwise to fully
open the valve.
• Turn the valve stem of gas side valve counter-
clockwise to fully open the valve.
• Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then
remove the hose.
• Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut securely
with an adjustable wrench. This process is very
important to prevent leakage from the system.
• Replace the valve caps at both gas and liquid side
service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
|
If tubing length is longer
|
than 10 m (33 ft)
|
15 mm. or more
3-way
valve
(Close)
2-way
valve
(Open)
Hexagonal wrench
Outdoor unit
Manifold valve
Pressure
gauge
Open
40
Gas side
Liquid side
Cap
Indoor unit
Close