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Pre-Commissioning
Due to our policy of continuous product innovation, some specifications may change without notification.
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PRE-COMMISSIONING
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sections of the pipe system, making the evacuation procedure inconclusive. Contact your LG Applied Rep or service technician for the
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• For multi-frame outdoor units, connect the vacuum pump / manifold to the service port Schrader ports (or core) to only one outdoor unit,
preferably the Sub outdoor unit that is installed farthest away from the refrigerant piping system and connected DOAS units.
•
Never perform evacuation using refrigerant.
• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.
• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before
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use.
• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.
• Use a quality micron gauge in good operating order and install as far away from pump as possible.
Triple Evacuation Procedure
After the leak / pressure check is complete, perform a Triple Evacuation with the entire system. Evacuation must be performed through the
Schrader ports on the outdoor unit service ports.
• For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original
Schrader core before operating the system.
• Evacuate through all three (3) hot gas line (high pressure vapor), liquid line, and suction (low pressure vapor) refrigerant lines.
• The outdoor unit service valves must remain closed and the stem head access caps tight.
Do not open the outdoor unit service valves
and release the factory refrigerant charge until the LG trained commissioner authorizes to do so. The system must be left in vacuum until
the LG trained commissioner verifies the quality of the evacuation.
• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for evacuation on all
piping and connected DOAS units.
Triple Evacuation Procedure Steps
1. If this procedure is performed shortly after the leak / pressure test, the caps and cores on the Schrader ports must have already been
removed, and the manifold must already be connected. If the procedure was not performed shortly after the leak / pressure test, make
sure to remove the caps and cores on the Schrader ports. Verify that the service valves on the outdoor unit are closed, and the stem head
access caps are tight.
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leak free (and oil is not moisture laden), the gauge must read <100 microns within one (1) minute.
Do not proceed if the gauge does not read
<100 microns within one (1) minute. There is a leak in the hose, gauge manifold, or vacuum valve, and the equipment must be replaced.
2. Connect the gauge manifold along with the vacuum pump to the Schrader ports (with core removed) using vacuum hoses. Open the
gauge manifold and the vacuum pump valves.
Triple Evacuation
