105
Installation
Due to our policy of continuous product innovation, some specications may change without notication.
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Dual-Frame Heat Pump Outdoor Unit Connections
Pipe Sizing for Heat Pump Units
REFRIGERANT PIPING DESIGN
Size (tons) Model Master Slave
16
ARUN192BTE4 ARUN121BTE4 ARUN072BTE4
ARUN192DTE4 ARUN121DTE4 ARUN072DTE4
18
ARUN216BTE4 ARUN144BTE4 ARUN072BTE4
ARUN216DTE4 ARUN144DTE4 ARUN072DTE4
20
ARUN240BTE4 ARUN144BTE4 ARUN096BTE4
ARUN240DTE4 ARUN144DTE4 ARUN096DTE4
22
ARUN264BTE4 ARUN144BTE4 ARUN121BTE4
ARUN264DTE4 ARUN144DTE4 ARUN121DTE4
24
ARUN288BTE4 ARUN144BTE4 ARUN144BTE4
ARUN288DTE4 ARUN144DTE4 ARUN144DTE4
• 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 units in a multi-frame system.
• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capacity, and, where applicable, slave1 outdoor
unit capacity must be greater than or equal to the slave2 outdoor unit capacity.
• Insulate all refrigerant system piping and piping connections as detailed on pages 131-132.
• Common pipe no longer required between frames.
A and B diameters match outdoor unit connection diameters. Main pipe D diameters are sized by LATS. See the table
below for C diameter.
Figure 24: Heat Pump Dual Frame Connections.
Table 32: Heat Pump Dual-Frame Connection Pipe Sizes.
ARCNN21
Outdoor Unit Connector
Pipe Accessory
To Indoor Units
Slave
Master
A
ARCNN21
(Multi-frame Outdoor Unit
Y-branch Connector)
B
D (main pipe
sized by LATS)
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