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Triple Leak / Pressure Check
After the refrigerant piping installation is complete, perform a triple leak / pressure test to check for leaks at any joints or connections within
the piping system.
DANGER
Using combustible gases, including oxygen, may result in fire or explosion and result in severe personal injury or death. Use inert gas (medi-
cal-grade dry nitrogen) when checking leaks, cleaning, installing/repairing pipes, etc. The use of a 600 psig nitrogen regulator is required for safety.
•
Do not apply power to the Multi V outdoor unit(s), the indoor units, and the heat recovery units before performing a system leak test. There
is a possibility that the EEV valves may close and isolate sections of the piping system, making the leak test inconclusive. Contact your LG
Applied Rep or service technician for the procedure to reopen the EEV valves before the leak test ONLY if the power has been applied.
• For multi-frame outdoor units, connect the nitrogen cylinder regulator to the gauge manifold, then connect the gauge manifold to the
Schrader port on the service port of only one outdoor unit, preferably the slave outdoor unit that is farthest away from the refrigerant piping
system and connected indoor units / heat recovery units.
•
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.
Triple Leak / Pressure Check Procedure Steps
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 all outdoor unit service ports are closed. For multi-frame outdoor units, verify the service valves on all master and slave outdoor
units are closed and the stem head access caps are tight. The leak / pressure check is to be performed to only the refrigerant piping
system and connected indoor units / heat recovery units.
• For systems designed for heat pump operation, verify that the liquid and vapor line service ports (and to the unused service port) are
closed, and the stem head access caps are tight.
• For systems designed for heat recovery operation, verify that the hot gas line (high pressure vapor), liquid line, and suction (low pres-
sure vapor) line service ports are closed, and the stem head access caps are tight.
3. Remove the caps on the Schrader ports. Connect the (medical-grade dry) nitrogen cylinder regulator to a gauge manifold, then connect
the gauge manifold to the Schrader ports on the service ports.
• For systems designed for heat pump operation, connect the nitrogen cylinder regulator to the gauge manifold, then connect the gauge
manifold to the Schrader ports on the liquid and vapor line service ports.
• For systems designed for heat recovery operation, connect the nitrogen cylinder regulator to the gauge manifold, then connect the
gauge manifold to the Schrader ports on the hot gas line (high pressure vapor), liquid line, and suction (low pressure vapor) service
ports.
For multi-frame outdoor units, connect the gauge manifold to the Schrader ports on only one outdoor unit, preferably the slave outdoor unit that is
farthest away from the refrigerant piping system and connected indoor units / heat recovery units.
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.
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Triple Leak / Pressure Check
Do not connect to the unused port.
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