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Vulcan cx90 ducted heater

I wish to upgrade my vulcan cx90 heater thermostat (controller )with a honeywell touch pad controller what is the wiring required

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  • rajarv Mar 18, 2009

    I suspect my Vulcan ducted heater thermostat unit is not working but was told this unit is no longer available. On enquiry, I was tod that a Honnywell 1319158 was the replacement. When looking at the Honnywell over the counter I could see it was not a diect wire to wire replacement as it had a different pin out arrangement. i could not get a circuit so am stuck as to how to meke the substitution. any help?

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240 volt wiring required.

Posted on Mar 17, 2008

  • tinkerler Jun 21, 2011

    I have the same unit.. and I eventually found out it requires a wiring mod on the furnace outside... it is not difficult... but i'd recommend getting someone qualified

    the thermostat basically connects directly to the gas valve. If you google around you'll find that most of the basic old thermostats need to connect up to the "R" and "W" terminals on the thermostat. If you google around for info wiring a gas valve to a thermostat you should be able to work it out. If you can't you shouldn't really be attempting it.
    1 - switch off the power to the heater
    2 - disconnect wire 15 from "TH" terminal on gas valve
    3 - disconnect internal heater wires from "A" and "B" terminals on terminal block, and tape them up
    4 - connect two wires from the terminal block to gas valve. A to TH on gas valve and B to TH/TR on gas valve
    5 - note the colors of A and B wires
    6 - connect the thermostat to the wall, tape up C-F, connect A and B to the "W" and "R" on the thermostat

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