I have an older Bryant 394 and a new M35 Johnson Controls Vent Damper. Photos and diagrams are here:
http://66.103.136.252/Vent/index.html
.... need help in figuring out which Vent Damper wires go where.
Thank you for helping me figure it out!
And you want to put a vent damper on that older furnace because?
a google of the device suggests it's a 24 volt which by your illustration says you're attaching to a furnace that has a standing pilot light? in this project you must be converting to pilotless. if your photo shows the tab broken away, separating W from Gas-1 [i cant read the circuit board maybe your on board yellow?] it looks like the flue damper must be enabled to switch the formerly tabbed closed circuit from open to closed to provide power to the gas valve solenoid. so of the 4 new M35 wires, use the ohmmeter to find the low ohms of the actuating pair that opens the damper. when that pair gets its 24V the damper opens, closing the formerly tabbed circuit wire pair from their normally open state. the M35B also displays a green light. with your meter set to measure ac i would look for 24vac on R and C of the Bryant when the thermostat calls for heat. before connecting i'd try one or maybe two 9 volt batteries in series to actuate the m35 pair you tested to operate the damper before you connect it. here's where that bag of different colored alligator jumpers is useful. if you have damper activation, then use ohmmeter to test the other m35 pair normally open but closed when the damper is fully activated.
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