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MULTI V Space II Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Space II Unit Capacity (ton) Liquid pipe (inches OD) Vapor pipe (inches OD)
4.4 Ø3/8 Ø3/4
Downstream Total Capacity of IDUs (Btu/h)
1
Liquid pipe (inches OD) Vapor pipe (inches OD)
≤19,100 Ø1/4 Ø1/2
≤54,600 Ø3/8 Ø5/8
≤76,400 Ø3/8 Ø3/4
Table 19: Size of Main Pipe (A) (From Space II Unit to Y-branches).
Indoor Unit Capacity
1
Liquid pipe (inches OD) Vapor pipe (inches OD)
≤19,100 1/4Ø 1/2Ø
≤54,600 3/8Ø 5/8Ø
≤76,400 3/8Ø 3/4Ø
1
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted indoor units have Ø3/8 (liquid) and Ø5/8 (vapor).
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
Selecting the Refrigerant Piping
Example: Five (5) indoor units connected
Space II Unit.
IDU: Indoor Units.
A: Main Pipe from Space II Unit to Y-branches.
B: Branch Piping.
C: Branch Piping to Indoor Unit (IDU).
Gas Pipe
Main Pipe
Liquid Pipe
Branch Piping
IDU
IDUIDUIDU
C
IDU
IDU
IDU
CCC
CCC
C
Space Unit
A
B
Branch Piping
B
Header
Header
Selecting the Refrigerant Piping
Figure 29: Selecting Refrigerant Piping.
Table 20: Size of Branch Piping (B) to Branch Piping (B).
Table 21: Size of Branch Piping to Indoor Unit (C).
1
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted indoor units have Ø3/8 (liquid) and Ø5/8 (vapor).
• Indoor units should be installed at a lower
position than the Header.
• Y-branch pipes cannot be used after
Headers.
• Install the Header so that the pipe dis-
tances between the between the con-
nected indoor units are minimized. Large
differences in pipe distances can cause in-
door unit performances to fluctuate.
• Always reference the LATS Multi V software
report.
REFRIGERANT PIPING CONNECTIONS
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