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Comfort Sync A3 Field Replacement Manual

Smart hub
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WARNING
Improper installation, adjustment, alteration,
ser vice or maintenance can cause property
damage, personal injury or loss of life.
Installation and service must be performed
by a li censed professional HVAC installer
(or equivalent) or a service agency.
Field Replacement Guide for
Comfort Sync A3 Smart Hub
General
This Smart Hub replacement kit is used to
replace any previous version of the Comfort
Sync A3 thermostat smart hub component.
• Read this entire document, noting which
procedures
pertain
equipment and system requirements.
• Make sure that all wiring conforms to local
and national building and electrical codes
and ordinances.
• Do not Install on voltages higher than
30VAC.
• Do not exceed 300 feet (91 meters) run
when using 18 or 22 AWG thermostat wire.
• Do not allow load from any thermostat
connection to be more than 1 AMP.
508045-01, 1/2020
to
your
specific

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Summary of Contents for Comfort Sync A3

  • Page 1 Comfort Sync A3 Smart Hub 508045-01, 1/2020 General This Smart Hub replacement kit is used to replace any previous version of the Comfort Sync A3 thermostat smart hub component. • Read this entire document, noting which procedures pertain your specific equipment and system requirements.
  • Page 2 Removing Old Smart Hub Make note of homeowner account information and home Wi-Fi access information. Go to the homeowner web portal and remove the original system from the account. Disconnect power to the entire system. Remove the access cover from Smart Hub. Take a picture or make a drawing showing the control wires and what terminals they are connected to.
  • Page 3 Installing New Smart Hub USE SMART HUB AS TEMPLATE TO MARK DESIRED MOUNTING LOCATIONS ON WALL OR STUD. CAUTION: DO NOT OVERTIGHTEN LOWER MOUNTING SCREW, MAY Remove new Smart Hub from DAMAGE SMART HUB. shipping container. Remove the access cover from the Smart Hub.
  • Page 4 Smart Hub LED Indicators, Terminals and External Components System Status LED System Commissioning Status LED Antenna USB Port Dealer commissioning and manual reboot button Terminal Connection Access Cover...

  • Page 5: System Status Indicators

    Table 1. System and Commissioning Status Indicators System Status Indicators LED Color System Status Description Green System is normal No system errors (Default state) HVAC Error System has critical alert which needs installer attention. Cyan Alerts Indoor unit is not connected or unable to communicate. Magenta Thermostat Error HD display not connected.
  • Page 6 Table 2. Smart Hub Terminal Designations, Order and Wiring Requirements Terminal Description Thermostat Wiring Designation 24VAC input 18AWG unshielded RS-BUS I+ 22AWG shielded (recommended) (2-pair conductor only) RS-BUS I- 24VAC return 18AWG unshielded ACC1 Accessory 1 and 2 (typically can be used for 1 or 2 speed ventilators and 18AWG unshielded ACC2...
  • Page 7 Installation Considerations Things to consider when installing the Smart Hub: • Install the Smart Hub near the indoor unit such that there is a direct path to the approximate location of the home Wi-Fi access point (the signal is not blocked by the indoor unit or duct work, for example).