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INSTALLATION INSTRUCTIONS
Electric Wiring and Applications Cont.
IMPORTANT (cont)
• Maintain polarity throughout the entire communication network. The system will malfunction if not properly wired.
• Always create an as-built wiring diagram containing the exact sequence in which all the indoor units / valve box units are
wired in relation to each unit. Update this as needed to keep it current.
• Do not include splices or wire nuts in the communication cable. Maintain an uninterrupted length of wire the entire length
between devices. Splices in the communication cable can cause communication issues.
• Always verify the communication cable is connected to the correct communications terminal on the unit(s).
• Never apply line voltage power to the communication cable. This could result in, the PCBs being damaged.
• Never use a multiple-core communications cable. Each communications bus must be having a separate cable (i.e.,
between outdoor unit(s), valve box(s), 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 communication, and unacceptable system
operation.) a
From Main Outdoor Unit to Central Controllers
• Communication cable from Primary Outdoor Unit to Central Controller is to be 18 AWG, 2-conductor, twisted, stranded,
shielded. Ensure the communication cable shield is properly grounded to the Primary ODU chassis only. Do not ground
the communication cable at any other location. Wiring must comply with all applicable local and national codes.
• Connect all central control devices on the same cable if cable requirements are the same.
• Maintain polarity throughout the communication bus.
• Route the cable as needed between each device.
• Connect shields together at each termination point to maintain a continuous shield throughout the communications
trunk.
• Add insulation material as required by local code. Cable requirements could differ depending on other installed
components:
• Ensure the communication cable shield is properly grounded to the Primary ODU chassis only. Do not ground the
communication cable at any other point. Wiring must comply with all applicable local and national code.
From Indoor Units to Remote Controllers
• Communication cable from Indoor Unit to Remote Controller(s) is to be 22 AWG, 3-conductor, twisted, stranded,
unshielded. Wiring must comply with all applicable local and national codes.
• Indoor unit controller connections depend on type of indoor unit being installed.. 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.
• NEVER splice, cut, or extend cable length with field provided cable. Always include enough cable to run the entire
distance between the indoor unit and the remote controller.
49-5000878 Rev. 0
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