Prepare The Refrigerant Piping System - LG Multi V Water IV Installation Manual

Pressure (Leak) Test
Verify a pressure (leak) test has been performed and passed. If not, perform one now. Use medical grade dry nitrogen and pressure test the
refrigerant piping system to a minimum of 550 psi for a period of 24 hours.
Evacuate the Refrigerant Piping System
Note:
The water source unit may be put in "vacuum mode." Generally, using the vacuum mode feature does
assist with the vacuum process and is not necessary if a vacuum pump is connected to all charging ports
at the water source unit simultaneously as suggested herein. See the Technical Service Manual for this
product for more information.
Note:
DO NOT apply power to any Multi V system device prior to performing a system evacuation. There is a
possibility that EEV valves may close and isolate sections of the pipe system, Contact your LG Applied
Rep champion or service technician for the procedure to reopen the EEV valves before evacuation.
1. Release the Pressure Test dry nitrogen charge from all refrigerant pipes.
2. Verify ALL field installed isolation ball valves are OPEN (including those that are capped for future use).
3. Remove and discard the Schrader valve cores at the water source unit charging ports. This ipreventive step ensures that valves used after
charging the system have not been subjected to the high pressure used during the Pressure Test.
4. Attach a 5/16" core removal tool equipped with ball valve and a fresh core to each charging port on the water source unit.
5. Check the vacuum pump(s) you intend to use and verify the oil in the sump is fresh and not contaminated.
6. Attach the vacuum pump(s) to each charging port simultaneously using high quality refrigerant vacuum hoses.
7. Perform a triple evacuation.
8. Achieve a micron gauge reading of less than 500 microns.
9. At 500 microns, valve off the charging port by closing the core removal tool ball valves.
10. Remove the vacuum hoses and pumps.
11. Leave the refrigerant piping system in a vacuum until the commissioning agent arrives and is satisfied with the micron gauge reading.
Note:
• There is no danger in leaving the refrigerant piping system in a vacuum as all piping and equipment are
dry and have never had oil in them.
• The system must be left in a vacuum until the Commissioning Agent arrives and verifies the quality
of the evacuation process. If the evacuation procedure was not conducted properly, the system will
likely malfunction and operate erratically. Significant costs may be incurred including but not limited to
refrigerant reclaim, recycle, and replacement.
• Do not open the water source unit service valves and release the factory refrigerant charge until the
commissioning agent authorizes to do so.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Prepare the Refrigerant Piping System

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