LGRED Heat LMU300HHV Installation Manual
49
Refrigerant Piping System Installation
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MULTI
F
MAX
MULTI
F
WITH
Multi F MAX with LGRED Outdoor Units
(36, 42 kBtu/h)
(Only for 18, 24 kBtu/h Indoor Units)
(Only for 36 kBtu/h Indoor Units
to Connect to “D ROOM”)
(Branch Distribution Unit: PMBD3640)
A ROOM
B ROOM
C ROOM
D R
OOM
A ROOM
B ROOM
C ROOM
D ROOM
(Branch Distribution Unit: PMBD3641)
Branch Distribution to Indoor Unit Piping Connections
• Install indoor unit liquid and vapor refrigerant pipes (and connection wiring) to the appropri-
ate branch distribution ports.
• Clearly note on the indoor unit’s refrigerant piping (liquid, vapor) which branch distribution
port it is connected to (A, B, C, D).
Table 26: Branch Distribution Unit Piping Connections.
Branch
Distribution
Unit
Refrigerant Connections
Pipe Size (in.)
Connectible Indoor Unit Capacity
(Btu/h)
Liquid Vapor
PMBD3620 Ø1/4 x 2 Ø3/8 x 2 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3630 Ø1/4 x 3 Ø3/8 x 3 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3640 Ø1/4 x 4 Ø3/8 x 4 7,000, 9,000, 12,000, 15,000, 18,000, 24,000
PMBD3641 Ø1/4 x 4
Ø3/8 x 3 7,000, 9,000, 12,000, 15,000, 18,000, 24,000 (A, B, C)
Ø1/2 x 1 24,000, 36,000 (D)
Figure 51: Branch Distribution Ports to Indoor
Units -- Side View.
Connection sockets (included as
a factory-supplied accessory with
the indoor units) will need to be
used when piping the indoor units
to the branch distribution unit. The
connection sockets for 36k indoor
units are factory supplied with the
branch distribution units. See
tables above and below for indoor
unit piping connection and con-
nection socket dimensions. See
the follow page for the connection
socket installation procedure.
Indoor Unit Capacity
Vapor Line
Piping Size (in., OD)
Liquid Line
Piping Size (in., OD)
7,000 Btu/h
Ø3/8
Ø1/4
9,000 Btu/h
12,000 Btu/h
15,000 Btu/h
15,000 Btu/h: Console;
18,000 Btu/h
Ø1/2
24,000 Btu/h
36,000 Btu/h Ø5/8 Ø3/8
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
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct,
Four-Way Cassette
Ø1/2 Ø1/4
24,000 Btu/h Ø1/2 Ø1/4
36,000 Btu/h Ø5/8 Ø3/8
Table 27: Indoor Unit Pipe Sizes.
Table 28: Indoor Unit Piping Connections.
Indoor Unit Capacity
Vapor (in., OD) Liquid (in., OD)
A B A B
18,000 Btu/h: Wall-Mounted ĺĺ ĺ
15,000 Btu/h: Console;
18,000 Btu/h: Low Static Duct, Four-Way Cassette
ĺ N/A
24,000 Btu/h ĺ N/A
36,000 Btu/h ĺ ĺ
Table 29: Connection Socket Dimensions.
INSTALLING MULTI F MAX WITH
LGRED SYSTEMS
Figure 50: Branch Distribution Piping
Connections.
ABC D