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you get the 24v from the control transformer, its the size of your fist and heavy. find it on the wiring diagram first.. then trace wires to find it
the red thermostat wire goes directly to one side of the transformer... run that through the contacts on your smoke detector to kill the ac unit if there is smoke detected.
read that over a few times, let me know if it makes sense on your end.
we can go from there as necessary. phil
I have no A.C. and no visable transformer, only a panel .but I will take anouther look. the three wires (thermostat ) White - com, red - - f an on manualy no heat -- black-- heat controled by thermostat. Ed.
The furnace is fit with a 24v transformer.. and the controls are the same as with a unit with ac... the transformer is INSIDE the furnace, behind the cover that llifts up 2" then out, to expose the gas valve..
the gas valve area can be located by noticing where the gas line enters the furnace.
Look that over, tell me if it makes any sense on your end. Phil
Sorry You Are Right, I found it on the wireing diag.
Thanks Phil . So I can get my 24 v .to feed the smoke dect. from the trans , and switch on the red thermostat wire ? Ed.
Keep in mind if breaking 24 the fan will still run for 90 seconds. Most duct detectors are designed to stop the air flow asap as to not help spreads smoke.
If you want warning only then breaking 24 is sufficient...but for instant shut down as code requires breaking 24 does not cause instant shut down.
Just a bit of additional info on this unit.