LG Multi V Water IV - Refrigerant Piping Installation: Pressure (Leak) Testing (Heat Recovery); Heat Recovery Pressure Test Procedure

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MULTI V Water IV System Installation Manual
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Heat Recovery Pressure Test
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) is
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
Pressure (Leak) Testing
Close
Close
Slave WSU
Close
Close
Master WSU
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Liquid pipe
Vapor pipe
High-pressure
vapor pipe
Close
Close
Heat
recovery
unit
Liquid side
Low-pressure
vapor pipe
Low-pressure
vapor side
High-pressure
vapor side
Vacuum
pump
Liquid pipe
Vapor pipe
Liquid pipe
Vapor pipe
Liquid pipe
Vapor pipe
Liquid pipe
Liquid
Pipe
Low-press
vapor pipe
High-press
vapor pipe