Evacuation Of Lines; Finishing Up - LG Art Cool Premier LA120HYV1 Installation Manual

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Engineering manual (48 pages)

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Table of Contents

Evacuation

After successful leak testing has been performed, follow Evacuation procedure. Follow the same steps for charge hose hookup to the system.

See Figure 55 on previous page for proper hookup.

Procedure

1. Confirm that the "Lo" knob of the manifold valve is open. Refer

back to Figure 55.

2. Confirm that the "Hi" knob of the manifold valve is left closed.

3. Run the Vacuum pump.

• Operate pump until system is 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 16 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 55 on previous page).

2. Turn valve of gas stem counter-clockwise to fully open 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

vacuum pump.

Charging

Each outdoor unit is factory charged (nameplate charge) for the

evaporator as well as a standard 41 ft line. Any time a line set

is used that is longer then the standard 41 ft line set length, the

refrigerant charge has to be adjusted.

You must adjust the charge based on how many feet of piping

are added based on 0.22 oz. of R410A per foot for 9k/12k units

and 0.38 oz for 18k/24k units. The factory charge accommodates

pipe lengths up to the standard length without requiring refrigerant

removal.

Table 17: Charging - Additional Refrigerant

Pipe Size

Capacity

(Btu/h)

Vapor

Liquid

HYV1

9k, 12k

3/8

1/4

18k, 24k

5/8

3/8

REFRIGERANT PIPING CONNECTIONS

Standard

Max.

Length (ft)

Elevation (ft)

32.8

24.6

65.6

Due to our policy of continuous product innovation, some specifications may change without notification.

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 Run

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.

If you are uncertain of the unit charge, reclaim, evacuate and weigh

in the correct charge using the unit nameplate (capacity) charge

adjusting for line sets longer or shorter than 41 ft. This will prevent any

interruptions to the functioning of the unit and possible damage.

Example: A 50ft line set is used when installing a 12k unit--

9 additional feet x 0.22 oz per ft = Add 1.98 oz of R410A

Max.

Min.

Length (ft)

65.6

6.6

98.4

9.8