Pressure (Leak) Testing - LG Multi V Water IV Installation Manual

Perform a Pressure (Leak) Test
Do not apply power during this test. If power has been applied to any device before the pressure test, contact your LG Applied Rep champion or
service technician for the procedure to reopen the EEV valves.
1. Upon completion of refrigerant piping system installation, open all isolation ball valves throughout the piping system.
2. DO NOT apply power to the Water Source and Indoor Units. If power is applied, expansion valves close and the pressure test will not be
conclusive.
3. DO NOT open the water source unit service valves; the factory refrigerant charge will be released.
4. Use medical grade dry nitrogen and pressure test the refrigerant piping system to a minimum of 550 psi for a period of 24 hours.
Pressurize the liquid, low pressure vapor, and high pressure vapor (heat recovery systems only) concurrently.
Heat Pump Pressure Test
Vacuum
Pump
During pressurization, the nitrogen gas cylinder must be positioned vertically to prevent the nitrogen from entering the refrigeration
system in its liquid state. Do not position the nitrogen cylinder on its side.
If the ambient temperature changes between the time when pressure was applied and when the pressure drop is checked, adjust
results by factoring in approximately 1.45 psi for each 2°F of temperature difference.
Correction formula = (Temperature when pressure was applied – Temperature when pressure drop is checked) x 0.01.
Example: When pressure (550 psig) was applied, ambient temperature was 80.6°F; 24 hours later when pressure drop (540 psi) was
checked, ambient temperature is 68°F. Thus, (80.6 - 68) x 0.01 = 0.126. In this case, the pressure drop of 0.126 is due to temperature
difference; therefore, there is no leak in the refrigerant piping system.
REFRIGERANT PIPING INSTALLATION
Slave WSU
Connect
Gauges to
Schrader
Valves
Close
WSU
Close
Valve
WSU
Valve
Liquid Pipe
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Pressure (Leak) Testing

Master WSU
Close
WSU
Valve
Close
WSU
Valve
Vapor Pipe
Indoor Unit
Liquid Side
Vapor Side
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