Air Purging With Vacuum Pump - LG LSN090HYV Product Data Book
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Also See for LSN090HYV:
- Svc manual (9 pages) ,
- Overview (20 pages) ,
- Specification (2 pages)
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6RMI0-04C
Air Purging
The air and moisture remaining in the refrigerant system have undesirable e ects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) e ciency 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. Preparation
• Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly
connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and the
liquid side on the outdoor unit. Note that both the liquid and the gas side service valves on the outdoor unit are kept
closed at this stage.
2. Leak test
• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.
Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose.
The knob of the 3-way valve must always be kept close.
- Pressurize the system to maximum 250 P.S.I.G. (R-22 model) or 400 P.S.I.G.
(R-410A model) with dry nitrogen gas and close the cylinder valve when the gauge reading reaches 250
P.S.I.G. (R-22 model) or 400 P.S.I.G. (R-410A model). Next step is leak test with liquid soap.
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.
1. Do a leak test of all joints of the tubing
indoor and outdoor) and both gas and liquid
side service valves.
Bubbles indicate a leak. Be sure to wipe o
test so lution with a clean cloth.
2. After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening
the charge hose connector at the nitrogen
cylinder. When the system pressure is
reduced to normal, disconnect the hose from
the cylinder.
78
(both
Outdoor unit
Inverter Single
Indoor unit
Pressure
gauge
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Installation
Manifold valve
Lo
Hi
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