Evacuation Of Lines; Finishing Up, Charging - LG LA090HVP Installation Manual

REFRIGERANT PIPING CONNECTIONS

Evacuation of Lines

Finishing Up, Charging

Evacuation
After successful leak testing has been performed, follow Evacuation procedure. Follow the same steps for charge hose hookup to the system.
See Figure 47 on previous page for proper hookup.
Procedure
1. Confirm that the "Lo" knob of the manifold valve is open. Refer
back to Figure 47.
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 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 46).
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.
Charging
Each outdoor unit is factory charged (nameplate charge) for the
evaporator as well as a standard 25 ft line. Any time a line set is
used longer then the standard 25 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. The factory charge
accommodates pipe lengths up to the standard length without
requiring refrigerant removal.
Table 17: Charging - Additional Refrigerant
Capacity Pipe Size
(Btu/h)
Vapor Liquid
9k, 12k 3/8 1/4
42
Standard Max.
Length (ft) Elevation (ft)
25 25
Due to our policy of continuous product innovation, some specifications may change without notification.
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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.
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.
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 25 ft. This will prevent any interrup-
tions to the functioning of the unit and possible damage.
Example: A 30ft line set is used --
5 additional feet x 0.22 oz per ft = Add 1.1 oz of R410A
Max. Min.
Length (ft) Length (ft)
49 9.8
Additional
Refrigerant (oz/ft)
0.22