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MULTI V IV System Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
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Pipe Sizing for Heat Pump Systems
REFRIGERANT PIPING DESIGN
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
Y-branch Pipe Sizing When Installing a Triple-Frame System
Example: Five (5) indoor units connected
ODU: Outdoor Units.
IDU: Indoor Units.
A: Main Pipe from Outdoor Unit to Y-branch.
B: Y-branch to Y-branch.
C: Y-branch to Indoor Unit.
Header Pipe Sizing When Installing a Single Outdoor Unit System
Example: Six (6) indoor units connected
ODU: Outdoor Units
IDU: Indoor Units
A: Main Pipe from Outdoor Unit to Header
C: Header to Indoor Unit
• Larger-capacity outdoor units must be the
master in a multi-frame system.
• Single-compressor outdoor units (72,000 Btu/h
capacity) cannot be the master outdoor unit in
a multi-frame system.
• Master outdoor unit capacity must be greater
than or equal to the slave1 outdoor unit capac-
ity, and, where applicable, slave1 outdoor unit
capacity must be greater than or equal to the
slave2 outdoor unit capacity.
height1 ≤16-7/16 feet
≤33 feet
Slave1 ODU
Slave2 ODU
Master ODU
Y-branch
To indoor units
To
outdoor
units
A
C CC C
C
B
B
B
Elevation1: ≤361 feet
Elevation2: ≤131 feet
Length: ≤492 feet (656 feet conditional application)
ℓ:
≤131 feet (295 feet conditional application)
IDU
IDU
IDU
IDU
Y-branch
IDU
A
C
C
C
C
C
C
ℓ:
≤131 feet (295 feet
conditional application)
Length: ≤492 feet (656 feet conditional application)
Elevation2: ≤131 feet
Brazed Cap
Header
IDU
IDU
IDU
IDU IDU
IDU
See pages 109-110 for refrigerant pipe diameter and pipe length tables.
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