Symbio 700 has the ability to send a 24vac supply fan start/stop that can be used to energize a relay or contactor. When pairing to a UCCA AHU with the 1W1 board and NO supply fan VFD (contactor controlled fan), a field installed relay is used at the 1W1 to isolate the 24vac between the two units.
Fan contactor on UCCA AHU with 1W1 board are wired to the 1W1 and controlled by Relay K2 which is energized by the MC port on TB6-7.
See drawings below for connection to the 1W1 and from the relay to the condenser:
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.