Triple Leak / Pressure And Evacuation Procedures - LG LV181HV4 Installation Manual

Single zone vertical air handling unit 18,000 - 48,000 btu/h

Table of Contents

Triple Leak / Evacuation Procedure, continued.

7. If the pressure does NOT drop for one (1) hour, the system passes the test.

8. If the pressure drops, there is a leak and it must be found. Remove the bubble solution with a clean cloth, repair the leak(s), and perform

the leak / pressure check again.

9. After the system has been thoroughly tested and no leaks are found, depressurize by loosening the charging hose connector at the nitro-

gen cylinder regulator. When system pressure returns to normal, completely disconnect the charging hose from the cylinder, and release

the nitrogen charge from all refrigerant piping. Wipe off any remaining bubble solution with a clean cloth.

Triple Evacuation Procedure

After the leak / pressure check is complete, perform a Triple Evacuation to the refrigerant piping system and connected indoor unit. Evacua-

tion must be performed through the Schrader ports on the outdoor unit service port.

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.

• Deep evacuate through both the liquid and gas (vapor) suction Schrader ports on the outdoor unit service ports.

• The outdoor unit service valves must remain closed and the stem head access caps tight.

and release the factory refrigerant charge until trim charge is complete, and the system is ready to

operate.

• Any field-installed ball valves (if used) in the refrigerant system must be open to ensure all piping is

free and clear for evacuation on all piping and connected indoor unit.

•

Do not apply power to the single zone system before performing the evacuation proce-

dure. There is a possibility that the EEV valve may close and isolate sections of the piping

system, making the evacuation procedure inconclusive.

•

Never perform evacuation using refrigerant.

• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tub-

ing, 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 EVERY 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 Steps

1. If this procedure is performed shortly after the leak / pressure test, the cap and core on

the liquid and gas (vapor) suction 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 cap and core on the liquid and

gas (vapor) suction Schrader ports. Verify that the service valves on the outdoor unit are

closed, and the stem head access caps are tight.

2. Connect the gauge manifold along with the vacuum pump to the liquid and gas (vapor)

suction Schrader ports (with core removed) using a vacuum hose. Open the gauge

manifold and the vacuum pump valves.

FINAL INSTALLATION PROCEDURES