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Installation
CAUTION:
To avoid nitrogen entering the refrigerant system in a liquid state, the top of the
cylinder must be higher than its bottom when you pressurize the system. Usually, the
cylinder is used in a vertical standing position.
7. Check for leakage with Liquid soap solution. Do the leakage test at all joints of tubing (indoor and
outdoor) and on the service valve (both gas and liquid side).
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
Evacuation
1. If the system is found free from all leakages,
relive the nitrogen pressure by loosening the
charge hose connector at nitrogen cylinder.
Disconnect the hose from cylinder when
pressure reaches to normal state.
2. Evacuation : Connect the charge hose to the
vacuum pump and Connect the "Lo" side hose
to the outdoor unit Which is the gas side valve.
Check that the "Lo" Knob of manifold valve to
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump.
• The degree of vacuum should be under 0.8 Torr.
• When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the
vacuum pump.
24 Ceiling Cassette Air Conditioner
2-way valve
(Open)
3-way valve
(Close)
Hexagonal wrench
Indoor unit
Outdoor unit
Manifold valve
Lo
Hi
Open
Close
Vacuum pump
Liquid side
Gas side
Cap
Vaccum
gauge
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