Engineering Manual

Table 112: Outdoor Unit Piping Connections.
Figure 276: Multi F Refrigerant Pipe Connec-
tions (LMU36CHV shown as example).
Main gas
valve
Main liquid
valve
Gas Piping Connections
Liquid
Piping
Connections
A-UNIT
B-UNIT
C-UNIT
D-UNIT
Connection sockets (included as a factory-supplied accessory with the
indoor units) may need to be used when piping the indoor units to the
outdoor unit. If a 36K indoor unit is included, the connection sockets
are included with the Branch Distribution unit.
A
B
Flare
to
Indoor
Unit
Flare
to
Outdoor
Unit
Indoor Unit
Capacity
Vapor Line Connection
(in., OD)
Liquid Line Connection
(in., OD)
7,000 Btu/h
Ø3/8
Ø1/4
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
18,000 Btu/h
Ø1/2
24,000 Btu/h
1. Align the center of the piping sections and tighten the flare nut by
hand.
2. Tighten the flare nut with a torque wrench, using the arrows on
the wrench as a guide, until a click is heard.
INSTALLATION & LAYOUT BEST PRACTICES
Refrigerant Piping System Layout
Multi F Outdoor Unit to Indoor Unit Piping Connections
Table 113: Indoor Unit Pipe Sizes.
Table 114: Connection Socket Dimensions.
Figure 277: Connection Socket Diagram.
Using the Connection Socket
Connection Socket
Figure 278: Performing Connections.
Table 115: Indoor Unit Piping Connections.
Outdoor Unit Piping Connections LMU18CHV LMU24CHV LMU30CHV LMU36CHV
Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4 1/4 x 4
Vapor Line Connection (in., OD) x Qty. 3/8 x 2 3/8 x 3 3/8 x 4 3/8 x 4
Indoor Unit Capacity
Vapor (in., OD)
Liquid (in.,
OD)
A B A B
18,000 Btu/h: Wall-Mounted ĺĺ ĺ
18,000 Btu/h: Low Static
Duct, Four-Way Cassette
ĺ N/A
24,000 Btu/h ĺ N/A
Indoor Unit Capacity
Vapor Line
Conn. (in., OD)
Liquid Line
Conn. (in., OD)
7,000 Btu/h
Ø3/8 Ø1/4
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
18,000 Btu/h: Wall-Mounted Ø5/8 Ø3/8
18,000 Btu/h: Low Static Duct,
Four-Way Cassette
Ø1/2 Ø1/4
24,000 Btu/h Ø1/2 Ø1/4
Avoid Pipe Damage
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nection at the unit frame.
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Allow room for field installation.
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200 | DESIGN & PRACTICES
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F