9.2 Leak Test
WARNING
Installation and Maintenance
15
Only after all the checking points have been checked
the unit can be operated.
(A) Check and make sure that the resistance of the
terminal to ground is more than 2M , otherwise, you
cannot operate the unit before the electricity leakage
point is found and repaired.
(B) Check and make sure that the stop valve has been
opened before operating the unit.
·
Ω
The trial should be carried out according to the
installation and maintenance manual.
Leak test all joints and valves of the indoor unit and
outdoor unit with liquid soap. Checking of the orifice
cap shouldn't be less than 30 seconds. Clean the
liquid soap after the test in case that the color of
the copper tube may change for erode.
9.3 Tidying Up the Piping
If the leak test turns out to be all right, preserve heat
the joints of the indoor unit.
Straighten the connecting tubes and make them
flush and fixed to the wall. Seal the space around the
hole in the wall through which the pipes come out
with gypsum.
9.4 Test Run
Make sure the power and unit run well then plug in.
Turn on the appliance and adjust it to Cooling,
dehumidifying and Heating mode according to the
room temperature. Check if the appliance can run
well.
Installation of the appliance is generally finished after
the above operations are done. If you still have any
trouble, please contact local technical service center
of our company for further information.
Narrow pipe
Hex wrench
Wide pipe
Service valve
Bonnet of service valve
Bonnet of narrow valve
Bonnet of wide valve
Indoor unit
Outdoor unit
Manifold
valve
Pressure
gauge
Vacuum pump
Fig.9.1
Fig.9.2
9.Air purging and test run
Air and moisture remaining in the refrigerant system
have undesirable effects.
Therefore, they must be purged completely following the
steps.
9.1 Air Purging with a Vacuum Pump
(See
Figure 9.1, Figure 9.2)
(1) Check that each pipe (both narrow and wide pipes
between the indoor and outdoor units) have been
properly connected and all wiring for the test run has
been completed. Note that both narrow and wide pipe
valves on the outdoor unit are kept closed at this stage.
(2) Using an adjustable wrench or box wrench, remove
the bonnet from the service valve.
(3) Connect a vacuum pump and service valve together
tightly.
(4) Turn on the vacuum pump and till the pressure is
lower than 15Pa(or 1.5
×
10
-4
bar) for 5 minutes.
(5) With the vacuum pump still running, disconnect
pipe of vacuum pump from the service valve. Then stop
the vacuum pump.
(6) Replace the bonnet on the service valve and fasten it
securely with an adjustable wrench or box wrench.
(7) Using an adjustable wrench or box wrench, remove
the bonnet of both narrow and wide valve.
(8) With the hex wrench, turn the wide and narrow pipe
valves stem counter clockwise to fully open the valves.
(9) Replace the bonnets on the wide and narrow valves
and fasten it securely with an adjustable wrench or box
wrench.
