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6. Air Purging
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below.
•
Pressure in the system rises.
•
Operating current rises.
•
Cooling (or heating) efficiency drops.
•
Moisture in the refrigerant circuit may freeze and block
capillary tubing.
•
Water my lead to corrosion of parts in the refrigeration
system.
Therefore, the indoor unit and tubing between the indoor
and outdoor unit must be leak tested and evacuated to
remove any noncondensables and moisture from the
system.
1)Air Purging with a Vacuum Pump
Preparation
Check that each tube (both liquid and gas side tubes)
between the indoor and outdoor units has been properly
connected and all wiring for the test run has been
completed. Remove the valve caps from both the gas and
the liquid side service valves on the outdoor unit.
NOTE, that both the liquid and gas side service valves
on the outdoor unit are kept closed at this stage.
Leak Test
1. Connect the manifold valve (with pressure gauges) and
dry nitrogen gas cylinder to this service port with charge
hoses.
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 closed.
2. Pressurize the system to no more than 150 P.S.I.G. with
dry nitrogen gas and close the cylinder valve when the
gauge reading reached 150 P.S.I.G. Next, test for leaks with
liquid soap.
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.
3. Do a leak test of all joints of the tubing (both indoor and
outdoor) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe of the soap with a
clean cloth.
4. 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 form the cylinder.
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