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In case of the Outdoor Unit being
installed above position of the Indoor
Unit.
4. Tape the Pipings and Connecting cable
from bottom to top.
5. Form the pipings gathered by taping along
the exterior wall, and make the trap
prevent water from entering into the room.
6. Fix the pipings onto the wall by saddle or
equivalent.
Air Purging
Air purging
The air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, after evacuating the system, take a leak test for the piping and tubing between the
indoor and outdoor unit.
Air purging with vacuum pump
1. Check that both liquid and gas pipe between indoor and outdoor have been properly
connected.
2. Remove the service valve cap from both the gas and liquid side on the outdoor unit.
3. Confirm that both the liquid and gas side valve are set to the closed position.
4. Connect the manifold valve(with pressure gauge) to the gas pipe side.
CAUTION:
: Be sure to use a manifold valve for
air purging. If it is not available, use
a stop valve for this purpose. The
"Hi" knob of the manifold valve
must always be kept close.
5. And connect the Nitrogen cylinder to the
service port with charge hoses to the
manifold gauge.
6. Pressurize the system to no more than 150
P.S.I.G with dry nitrogen gas. Close the
nitrogen cylinder valve when it shows
reading of 150 P.S.I.G.
Indoor unit
Outdoor unit
Installation
Seal a small opening
around the pipings
with gum type sealer.
Trap
Manifold valve
Pressure
gauge
Lo
Hi
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Installation Manual 23
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