28
MUL
TI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Closing the Shut Off Valve
1. Remove the shut off valve cap.
2. Turn the valve clockwise using a hexagon wrench until the shaft contacts the main body seal.
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3. Securely tighten the shut off valve cap.
Service Port
Leak Prevention Cap
Liquid Pipe
Refrigerant
Charging Port
Vapor Pipe
Avoid Pipe Damage
• When routing field-installed piping inside the outdoor unit frame, avoid causing damage to the piping from vibration. Mount the piping so
it does not make contact with the compressor, unit frame, terminal cover, or mounting bolts. Allow room for field installation.
• Properly insulate the liquid and vapor lines separately inside the confines of the unit casing.
• Refer to the figure on previous page for unit pipe routing options and the table for outdoor unit connection types.
When brazing the field-supplied piping to the outdoor unit piping connections:
• Protect the liquid and vapor piping / ports with a wet towel.
• Use 0.284 lbs. / in.
2
nitrogen flow in the piping. If a nitrogen flow was not used during welding, oxidization may form inside the piping and
cause the valves and condensers to malfunction.
Remove Leak Prevention Cap
The leak prevention cap on the outdoor unit service valve must be removed before
piping installation.
1. Verify if the liquid and vapor piping are locked.
2. Extract any remaining refrigerant or air inside through the service port.
3. Remove the leak prevention cap.
Figure 31: Removing the Leak Prevention Cap.
Shut Off
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Size
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Cap
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Connected to
Unit
Closed Opened
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Ø1/4
4.4 ± 0.4
3.7 ± 0.4
0.16 in.
13.0 ± 1.5
12.7 ± 2
12 ± 1.5
-
Ø3/8
28 ± 3.0
Ø1/2
7.4 ± 0.7
14.8 ± 1.5
41 ± 4.4
Ø5/8
8.9 ± 0.9
0.24 in.
18.4 ± 1.8
55 ± 5.1
Ø3/4
10.3 ± 1.0
81.1 ± 7.4
Ø7/8
22.1 ± 2.2
0.31 in.
-
18.5 ± 2.2
Ø1.0
Opening the Shut Off Valve
1. Remove the shut off valve cap.
2. Turn the valve counterclockwise using a hexa-
gon wrench until the shaft stops.
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valve. Doing so may break the valve body (the valve
is not a backseat type
3. Securely tighten the shut off valve cap.
Table 15: Tightening Torque.
Insulating the Shut Off Valve
Shut off valves must be insulated correctly and completely using closed cell Ethylene
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thick, and thickness may need to be increased based on ambient conditions, humidity
levels, and local codes. See page 44 - 46 for information regarding Ethylene Propylene
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REFRIGERANT PIPING CONNECTIONS
•
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•
Do not perform brazing in a closed space. Combustible refrigerant generates a poisonous gas harmful to humans. There is also a
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• After work is complete, close th
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may lead to illness or death.
DANGER
Outdoor Unit Connections
