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there are 2 types of this model...one is 120v solenoid...and one is 24v solenoid. 2006 and prior was 120v and after that I believe went 24v but this info should be on the solenoid....plus if 24v there is already a transformer so the unit having 24v and then getting 24v from furn circuit board would create 2 different 24v signals...if 120v you would be conflicting 24v with 120v which is going to damage something.
I need more info on the unit as far as voltage to continue