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Installation
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 for a Single Outdoor Unit 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.
Y-branch Pipe Sizing When Installing a Dual-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.
• 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 slave outdoor unit capacity.
See pages 109-110 for refrigerant pipe diameter and pipe length tables.
Length: ≤492 feet (656 feet conditional application)
Elevation1: ≤361 feet
ℓ:
≤131 feet (295 feet conditional application)
Elevation2: ≤131 feet
To indoor units
To
outdoor unit
B
B
B
A
C
C
C
C
C
Y-branch
Y-branch
IDU
IDU
IDU
IDU
IDU
Master ODU
Slave ODU
To indoor units
≤33 feet
Elevation1: ≤361 feet
Elevation2: ≤131 feet
To
outdoor
unit
C
CC
CB
BB
Length: ≤492 feet (656 feet conditional application)
ℓ:
≤131 feet (295 feet conditional application)
≤16-7/16 feet
Y-branch
A
Y-branch
C
IDU
IDU
IDU IDU
IDU
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