Refrigerant Handling; Line Set Installation - LG Central Air Conditioning Remote Condensing Unit Installation Instructions & Use And Care

REFRIGERANT HANDLING

• Warning! Do not sniff or inhale refrigerant. Personal injury or death may occur.
• Warning! Avoid contact with liquid refrigerant. Wear gloves and safety glasses to avoid frost-
bite and blindness.
• Warning! Never apply flame to refrigerant cylinder. Possible explosion resulting in personal
injury or death is possible.
• Warning! Never fill a cylinder more than 80% full of liquid refrigerant.
• Always recover refrigerant. EPA requires all refrigerant to be recovered.
• Warning! Always use EPA certified testing equipment and certified refrigerant tanks. Make
sure tanks have passed a hydrostatic test performed in last 5 years.

LINE SET INSTALLATION

• Verify proper diameter sizes for liquid line and vapor
lines.
• Long line sets may require larger diameter vapor line
(See Table 2).
REFRIGERANT LINE LENGTH (ft)
COND 0 - 24
UNIT Line Diameter (in. OD)
(TONS) Suct Liq
1.5 3/4" 3/8"
2 3/4" 3/8"
2.5 3/4" 3/8"
3 3/4" 3/8"
3.5 7/8" 3/8" 1-1/8" 3/8" 1-1/8" 1/2"
4 7/8" 3/8" 1-1/8" 3/8" 1-1/8" 1/2"
5 7/8" 3/8" 1-1/8" 3/8" 1-1/8" 1/2"
• The maximum line set length is listed in Table 3. Refer
to Figure 2 for dimension measurement.
• The factory oil charge is sufficient for Max. length in
table 3.
• Caution! Same line sets may require longer
than maximum. length listed in table 3, please
contact your wholesaler or/and distributor
before installation.
• Indoor unit may be a maximum of 50 feet above out-
door unit (See Figure 2).
• For every 35 feet that the outdoor unit is above the
indoor unit, an oil trap must be installed (See Figure 3).
• Vapor line must be insulated (See Figure 4).
• Insulate liquid line if ambient temperatures exceed
120˚F
• Liquid and vapor lines must not make metal-to-metal
contact.
• Avoid unnecessary turns.
Table 2
25 - 49 50 - 85
Suct Liq Suct Liq
3/4" 3/8" 3/4" 3/8"
3/4" 3/8" 3/4" 3/8"
7/8" 3/8" 7/8" 1/2"
7/8" 3/8" 1-1/8" 1/2"
COND UNIT LENGTH "X"
(TONS) IN FT MAX.
1.5
2
2.5
3
3.5
4
5
Oil trap
Indoor unit
Incorrect
Correct
— 4 —
Table 3
75
Max. "X"ft
85
85
85 Outdoor unit
85
85
85
Must be above top of Must be above top of
condenser coil condenser coil
Outdoor unit
Gas line
Liquid line
Tape
Liquid Line
Sheet Metal Hanger
Insulated vapor Line
Indoor unit
Max. 50ft
Fig. 2
Fig. 3
Fig. 4