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Electric Heat Adapter Harnesses
43675836 – Symbio Adapter Harness (WIR10632)
43675837 – Legacy Adapter Harness (WIR10690)
If you have a Symbio Condenser Paired with a Legacy Air Handler, don't set up the Symbio UI for electric
heat because you will get an Options Board Comm Fail.
The Relay Board, (which would be in a Symbio 2-Speed Air Handler designed to be paired with a EM
Condenser) has a fan interlock built in for electric heat, if you give it 24 vac on J5-7 only, the heat relay
clicks but there is no 24 vac output from J3-1, if you give it a G (J5-4) + W1 (J5-7) you get 24 vac out of
J3-1.
Two status LEDS will light up on the Options Board if there is a request for electric heat from the Symbio
700 UC, K1 is 1st stage, K2 is 2nd stage.
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