107
Electrical System Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
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The terminals labeled “GND” are NOT ground terminals. The terminals labeled ARE ground terminals. Inadequate connections may generate
heat, cause a fire, and physical injury or death.
WARNING
•
Make sure to match IDU A and B terminals on outdoor unit to A (3) and B (4) terminals on indoor units / heat recovery units. Maintain polari
-
ty throughout the communication network. The system will malfunction if not properly wired.
•
Always create a wiring diagram that contains the exact sequence in which all the indoor units / heat recovery units are wired in relation to
the outdoor unit.
•
Do not include splices or wire nuts in the communication cable.
Heat Pump Operation
Communications Cable Between Master Outdoor Unit and Indoor Unit
B
ODU
IDU
CENTRAL DRY1 DRY2 GND 12 V
A
B
A
B
A
Master Outdoor Unit Communication Terminal Block
B
ODU
IDU
CENTRAL
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
4(B)
3(A)
4(B)
3(A)
B
A
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
Master Outdoor Unit Communication Terminal Block
Slave 1 Outdoor Unit Communication Terminal Block
Slave 2 Outdoor Unit Communication Terminal Block
Indoor Unit
Indoor Unit
ODU
IDU
CENTRAL
ODU
IDU
CENTRAL
Heat Recovery Unit
3(A) 4(B)
A
B
3(A) 4(B)
B
ODU
IDU
CENTRAL
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
B
A
B
DRY1 DRY2 GND 12 V
A
B
A
B
A
Heat Recovery Operation
Communications Cable Between Master Outdoor Unit and
Heat Recovery Units / Indoor Units
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
B
ODU
IDU
CENTRAL DRY1 DRY2 GND 12 V
A
B
A
B
A
Master Outdoor Unit Communication Terminal Block
Master Outdoor Unit Communication Terminal Block
Slave 1 Outdoor Unit Communication Terminal Block
Slave 2 Outdoor Unit Communication Terminal Block
Indoor Unit
Indoor Unit
ODU
IDU
CENTRAL
ODU
IDU
CENTRAL
From Master Outdoor Unit to Slave Outdoor Unit(s), Multi-Frame Systems Only
• Communication cable from Master Outdoor Unit to Slave Outdoor Unit(s) is to be 18 AWG, 2-conductor, twisted, stranded, shielded. Ensure
the communication cable shield is properly grounded to the Master ODU chassis only.
Do not ground the communication cable at any
other point. Wiring must comply with all applicable local and national codes.
• Cable shields between the connected devices must be tied together and continuous from the master outdoor unit to the last component
connected.
• Master / Slave Communication Bus: Use ODU A and B terminals on master outdoor unit to ODU A and B terminals on slave outdoor unit(s).
• Insulation as required by NEC and local codes.
• Rated for continuous exposure of temperatures up to 140°F.
Example of Master Outdoor Unit to Indoor Unit Communication Cable
Connections (Heat Pump Systems).
Example of Master Outdoor Unit to Indoor Unit Communication Cable
Connections (Heat Recovery Systems).
ELECTRICAL
Communication Cable Specifications
Communication Cable Installation Between Master Outdoor Unit and Slave Outdoor Unit(s).
Communication Cable Between
Master Outdoor Units and
Slave Outdoor Units
(2-wire Cable)
Master
Slave 1
Slave 2
Communication Cable from
Master Outdoor Unit
to Indoor Units /
Heat Recovery Units
