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58
Single Zone Mega, Standard Eciency, and Mega 115V Wall Mounted Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
FINAL INSTALLATION PROCEDURES
Triple Leak / Pressure Test
After the refrigerant piping installation is complete, perform a triple leak / pressure test. Triple leak / pressure test is performed between the
outdoor unit and indoor unit to verify that refrigerant can flow through the system without danger of leaks or pressure losses. Air and moisture
that is left in the piping can lead to undesirable results and can cause damage to the system. It is important to go through a complete leak /
pressure cycle to be sure that the refrigerant piping is cleared out. This process will have to be repeated if any air or moisture be is found to
remain in the piping.
• Pressure in the system can rise.
• Operating current can rise.
• Inefficient cooling or heating mode capability.
• Moisture in the refrigerant circuit will freeze and block capillary
tubing.
• Water can lead to corrosion of parts in the system.
Insufcient or incorrectly done air purging will lead to the following:
DANGER
Using combustible gases, including oxygen will result in re or explosion, resulting in personal injury or death. Use inert gas (medical-grade dry
nitrogen) when checking leaks, cleaning, installing/repairing pipes, etc. The use of an 800 psig or higher nitrogen regulator is required for safety.
• Never perform the leak test using refrigerant.
• To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder
must be higher than its bottom (used in a vertical standing position) when the system is
pressurized.
• Use only a leak-free gauge manifold set.
• Piping system must not be pressured to more than 550 psi. Pressures greater than 550 psi
will damage the piping system and cause unit malfunction.
Triple Leak / Pressure Check Procedure
1. After the refrigerant piping installation is complete, open the isolation ball valves, if any,
that will have been included in the piping system.
2. Verify that both the liquid and gas (vapor) suction line outdoor unit service ports are
closed, and the stem head access caps are tight. The leak / pressure check is to be
performed only to the refrigerant piping system and the connected indoor unit.
3. Remove the cap on the gas (vapor) suction line Schrader port. Connect the (medi-
cal-grade dry) nitrogen cylinder regulator to a gauge manifold, then connect the gauge
manifold to the gas (vapor) suction Schrader port on the service port.
4. Perform the leak / pressure check at 150 psig for fifteen (15) minutes (standing pressure
check).
5. Perform the leak / pressure check at 300 psig for thirty (30) minutes (standing pressure
check).
6. Perform the leak / pressure check at 550 psig for one (1) hour to make sure the piping
system is leak-free. After the gauge reading reaches 550 psig, isolate the system by first closing the gauge manifold, then close the nitro-
gen cylinder valve. Check the flared (and any brazed connections) for leaks by applying a bubble solution to all joints.
The bubble solution must be a solution designed for refrigerant leak testing. Common soap solution must never be used on refrigerant piping as
those contain chemicals that could corrode copper and brass, and cause product malfunction.
Triple Leak / Pressure Test
Figure 102: Outdoor Unit Service Valves. (Ap-
pearances Will Vary Depending on Model.)
Figure 103: Triple Leak / Pressure Test Diagram.
Indoor Unit
Outdoor Unit
Gauge Manifold
Charge Hose
Nitrogen Gas
Tank (Upright
Position)
Refrigerant
Piping
Micron
Gauge
Connected to Shrader Valve
on Gas (Vapor) Service Port
Gas (Vapor)
Piping
Liquid Piping
Cap
2-way valve(Close)
3-way valve(Close)
Two-way Valve (Closed)
Three-way Valve (Closed)
Schrader Port (Open)
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