LG ARUM072BTE5 Installation Manual page 107

Example of Master Outdoor Unit to Indoor Unit Communication Cable
Heat Pump Operation
Connections (Heat Pump Systems).
Communications Cable Between Master Outdoor Unit and Indoor Unit
Master Outdoor Unit Communication Terminal Block
ODU IDU
A
B A B
3(A) 4(B) 3(A)
Indoor Unit Indoor Unit
WARNING
The terminals labeled "GND" are NOT ground terminals. The terminals labeled
heat, cause a fire, and physical injury or death.
• 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.
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.
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.
Communication Cable Installation Between Master Outdoor Unit and Slave Outdoor Unit(s).
Communication Cable from
Master Outdoor Unit
to Indoor Units /
Heat Recovery Units
CENTRAL DRY1 DRY2 GND 12 V
B A
4(B)
Master
Due to our policy of continuous product innovation, some specifications may change without notification.
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Communication Cable Specifications
Example of Master Outdoor Unit to Indoor Unit Communication Cable
Heat Recovery Operation
Connections (Heat Recovery Systems).
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s) Communications Cable Between Master Outdoor Unit and
Heat Recovery Units / Indoor Units
Master Outdoor Unit Communication Terminal Block
Master Outdoor Unit Communication Terminal Block
ODU
ODU
B A B
B A B
ODU
A B
B A B
Heat Recovery Unit
ARE ground terminals. Inadequate connections may generate
ODU
A B
B
Do not ground the communication cable at any
Slave 1 Slave 2
ELECTRICAL
IDU CENTRAL DRY1 DRY2 GND
IDU DRY1 DRY2 GND
CENTRAL
A
B A
A
B A
Slave 1 Outdoor Unit Communication Terminal Block
IDU CENTRAL DRY1 DRY2 GND
3(A) 4(B)
3(A) 4(B)
A
B A
Indoor Unit Indoor Unit
Slave 2 Outdoor Unit Communication Terminal Block
IDU CENTRAL DRY1 DRY2 GND
A
B A
Communication Cable Between
Master Outdoor Units and
Slave Outdoor Units
(2-wire Cable)
Comm
12 V
12 V
12 V
12 V
107