Electric/ oil hybrid wiring system


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Old 12-13-20, 07:39 AM
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Electric/ oil hybrid wiring system



Hi,
I just add a Stelpro SBM duct heater to my Lincoln barričre MBO oil furnace. Does anybody know how to wire these two together? Stelpro give me a plan but the wiring of the furnace dont match mine.
 
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Old 12-13-20, 09:54 AM
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The wiring diagram looks fairly basic.
The thermostat goes to the duct heater. The duct heater controls the furnace.
There is a connection to the blower motor.

Not sure what the HQ sensor is.
 
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Old 12-13-20, 10:38 AM
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Yes the duct heater control the furnace this parts is clear to connect. The hard one is the fan. I got no terminal on my furnace to allow an external item to control it
 
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Old 12-13-20, 12:48 PM
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In your picture is a fan thermostat right on the front of the furnace.
It's connected with red and blue wires. That should be what you are looking for.

There is a possibility that is not a fan thermostat but a limit control.
Check on the wiring diagram for the furnace. It should be posted on an access cover.
 
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Old 12-13-20, 01:51 PM
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Here's a picture of wiring diagram and few others from the duct heater. The previous other of the duct heater seem's to have installed what's look like a relay connected to a two wire thermostat câble identified has G ans R wire. Thank you for your time. i really apreciate.
 
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Old 12-13-20, 02:20 PM
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Connect the black and blue wires that go to the fan/limit switch to COM and NO on the duct heater.
Either direction.... no polarity.
 
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Old 12-17-20, 06:15 PM
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A huge thank sir. It's now working perfectly!
 
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Old 12-17-20, 06:45 PM
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Awesome job. You're welcome.
 
 

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