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COMPREHENSIVE APPLICATION AND INSTALLATION MANUAL
LG Electronics
Installation check list
Configuration
System Design
Applications
Introduction
1.3 Connect Vaccum Pump
Items to check
Is the vacuum level kept at or below 0.5 torr or is there any change
with vacuum for 1 hour after stopping the vacuum pump?
Result
Purpose
Check for leakage on pipings
Applicants
AWHP SPLIT
The operation time for evacuation varies with tubing length and capacity of the pump. The following table
shows the time required for evacuation.
Required time for evacuation when 30 gal/h vacuum pump is used
If tubing length is less than 10 m(33 ft)
If tubing length is longer than 10 m(33 ft)
30 min. or more
60 min. or more
0.5 torr or less
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Open
Open
Pressure
gauge
Finishing the job
1. With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
2. Turn the valve stem of gas side valve counter-clock-
wise to fully open the valve.
3. Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then
remove the hose.
4. Replace the flare nut and its bonnet on the gas side
service port and fasten the flare nut securely with 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 fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.
Filling refrigerant(If refrigerant is filled additionally, after repairing, additional charging is needed)
1. Close both valves of manifold gauge, connect center house(connection part of vacuum pump) to refrigerant tank
to release air from hose from manifold gauge to charging cylinder(Open charging cylinder valve shortly to release
air)
2. Open manifold gauge(Low compression: Blue) to fill gas first time and power on/operate the product and fill more
gas.
R410A
Open
Close
Gas piping connection
Open gas / liquid piping
Open cap and turn
counterclockwise
Manifold gauge
[Outdoor unit]
