Vacuuming And Test Run; Vacuuming With A Vacuum Pump; Leak Test; Cleaning The Piping - Hitachi air core 600 Installation & Maintenance Manual

9. Vacuuming and Test Run

Air and moisture remaining in the refrigerant system
have undesirable effects.
Therefore, they must be removed completely with the
following steps.

9.1 Vacuuming with a Vacuum Pump

Fig 9.1, Fig 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 with the pressure
lower than -0.1MPa (or -1 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.

9.2 Leak Test

Leak test all joints and valves of the indoor unit and
outdoor unit with liquid soap. Checking of the orifice
cap should not be less than 30 seconds. Clean the
liquid soap after the test to avoid color change or
erosion of copper pipe.

9.3 Cleaning the Piping

If the leak test turns out to be all right, preserve heat
joints of the indoor unit.
Straighten the connecting pipes and make them
flush and fixed to the wall. Seal the space around
the hole in the wall with gypsum through which the
pipes come out.

9.4 Test Run

The trial should be carried out according to the
installation and maintenance manual.
WARNING
Only after all the check 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.
(See
(B) Check and make sure that the stop valve has been
opened before operating the unit.
Make sure that the power supply and the unit are
fine before plugging into the power cord.
Turn on the appliance and adjust it to cooling,
dehumidifying according to the room temperature.
Check if the appliance can
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.
Fig.9.1
Fig.9.2
Pressure
gauge
Manifold
valve
Vacuum pump
31
Installation and Maintenance
operate smoothly.
Narrow pipe
Hex wrench
Wide pipe
Bonnet of wide valve
Bonnet of narrow valve
Service valve
Bonnet of service valve
Indoor unit
Outdoor unit
Ω