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INSTALLATION INSTRUCTIONS
Electric Wiring and Applications Cont.
IMPORTANT (cont)
Communication Cable Specifications Form Outdoor Units/Indoor Units /Valve Box Units
• Communication cable from Primary Outdoor Unit to Indoor Units / Valve Box Units is to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded to the Primary Outdoor Unit
chassis only. Do not ground the Outdoor Unit to Indoor Units / Valve Box Units communication cable at any other point.
• Wiring must comply with all applicable local and national codes.
• Cable shields between the connected devices must be connected together and continuous from the main outdoor unit
to the last component connected.
• Start the communication cable at the main outdoor unit and route to the indoor units / valve box units in a daisy chain
configuration. Do not install in a star configuration.
• Indoor Unit / Valve Box Unit Communication Bus: The communication terminals are labeled differently among the indoor
units, depending on type. Refer to the wiring diagram schematic found in the indoor unit itself, or to the indoor unit wiring
diagrams in the Engineering Manuals for more information.
• Insulation as required by NEC and local codes.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable communication cable length is 3,281 feet.
From Main Outdoor Unit to Sub Outdoor Unit(s), VP Boxes Multi-Frame Systems Only
• Communication cable from Main Outdoor Unit to Indoor Units / Valve Units is to be 18 AWG, 2-conductor, twisted,
stranded, shielded. Ensure the communication cable shield is properly grounded to the Main Outdoor Unit chassis only.
Do not ground the Outdoor Unit to Indoor Units / Valve Box Units communication cable at any other point.
• Wiring must comply with all applicable local and national codes.
• Cable shields between devices must be connected and continuous throughout the daisy chain
• Start the communication cable at the main outdoor unit and route to the indoor units / valve box units in a daisy chain
configuration. Do not install in a starburst configuration as communication problems will arise.
• Indoor Unit / Valve Box Unit Communication Bus: The communication terminals are labeled differently among the indoor
units, depending on type, Refer to the wiring diagram schematic found in the indoor unit itself, or to the indoor unit wiring
diagrams in the Engineering Manuals for more information.
• Insulation as required by NEC and local codes.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable communication cable length is 3,281 feet.
• Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.
Inadequate connections will generate heat, cause a fire, cause communication issues and physical injury or death.
• Always verify the communication cable is connected to a communications terminal on the outdoor unit(s). Never apply
line voltage power to the communication cable connection. If voltage is applied, the PCBs will be damaged.
• Never use a multiple-core communications cable .Each communications bus must be provided a separate cable (i.e.,
between outdoor unit(s) valve box(s) and indoor units, outdoor units and central controller(s). If communications cables
of separate systems are wired using a multiple-core cable, it will result in poor communications and unacceptable system
operation.
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