Final Installation Procedures; Triple Leak / Pressure Test - LG ART COOL LA090HSV5 Installation Manual

FINAL INSTALLATION PROCEDURES

Triple Leak / Pressure Test

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 may have to be repeated if any air or moisture be is found to
remain in the piping.
Insufficient or incorrectly done air purging may lead to the following:
• Pressure in the system can rise.
• Operating current can rise.
• Inefficient cooling or heating mode capability.
DANGER
Using combustible gases, including oxygen may result in fire 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 a 600 psig 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 may
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 may
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 (medical-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 nitrogen 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.
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• Moisture in the refrigerant circuit may freeze and block capillary
tubing.
• Water can lead to corrosion of parts in the system.
Figure 105: Outdoor Unit Service Valves.
LSU090HSV5, LSU120HSV5
Liquid Piping
Gas (Vapor)
Piping
Two-way Valve
(Closed)
Schrader
Cap
Port (Open)
Three-way Valve
(Closed)
LSU180HSV5 / LAU240HSV3
Gas (Vapor)
Piping
Three-way Valve (Closed)
3-way valve(Close)
Schrader Port (Open)
Two-way Valve (Closed) 2-way valve(Close)
Figure 106: Triple Leak / Pressure Test
Diagram.
Indoor Unit
Gauge Manifold
Charge Hose
Refrigerant
Piping
Nitrogen Gas
Tank (Upright
Position)
Outdoor Unit
Liquid Piping
Cap
Micron
Gauge