Finishing The Job; Test Running; Evacuation Of Lines; Finishing Up - LG LS091HSV3 Installation Manual

refrigerant PiPing connectionS

Evacuation of Lines

Finishing Up

evacuation
After successful leak testing has been performed, follow Evacuation procedure. Follow the same steps for charge hose hookup to the system.
See Figure 74 on previous page for proper hookup.
Procedure
1. Confirm that the "Lo" knob of the manifold valve is open. Refer
back to Figure 74.
2. Confirm that the "Hi" knob of the manifold valve is left closed.
3. Run the Vacuum pump.
• Operate pump until the system has been evacuated down to 300
microns.
• Run pump an additional 15 minutes after reaching micron level.
The duration of the operation of the vacuum pump will vary accord-
ing to pipe length and the capacity of the pump. Refer to Table 29 for
accurate time duration.

finishing the Job

Once the Evacuation procedure has been performed, follow the steps below to turn off all valves at the outdoor unit and safely disengage the
manifold valve, along with the vacuum pump. Refer back to the illustrations and tables on the previous pages as you go through the steps below.
Procedure
1. Using a wrench, turn the valve of the liquid stem counter-clock-
wise to fully open the valve (Figure 73).
2. Turn the valve of the gas stem counter-clockwise to fully open the
valve.
3. Loosen the charge hose connected to the gas side service port
slightly to release the pressure, and then remove the hose.
4. Replace the flare nut and its cap on the gas service port and
fasten the flare nut securely using an adjustable wrench.
• This process is very important to prevent leakage from the system.
5. Replace the valve caps at both gas and liquid side service valves
and then fasten them tightly.
• Once done, this will complete the air purging process with a vacu-
um pump.
60
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4. Turn off the pump and leave the connections secured to the two
service valves.
5. Wait 5 minutes.
6. If the system fails to hold 500 microns or less, check all connec-
tions for tight fit and repeat the evacuation procedure.
7. Once, desired vacuum is reached, close the "Lo" knob of the
manifold valve and stop the vacuum pump.
8. Proceed to Finishing the Job section, below.

test running

After leakage testing, and evacuation procedure the system should
be ready to start up for a test run. Follow the guidelines below for
proper procedure.
• Check that all tubing, piping and wiring are properly connected.
• Make sure that the gas and liquid service valves are fully open.
• Start up the system and do a test run.
• As system is up and running verify all is in working order and make
notes as needed to work around any issues that might crop up.