Question about Dayton (3E379) Heater

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I have a wall furnace with a 2 wire thermostat system, 1 wire from the 24v transformer & 1 wire goes to the gas valve. I have a Dayton 1uhg7 wireless thermostate that has heat & cool & several day programming. Can this thermostat be wired for a 2 wire system for heat only. The directions are not compatable to a 2 wire system. Is there possibly something else I need?

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6ya6ya
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Posted on Jan 02, 2017

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billyvangogh
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SOURCE: Dayton Heater M/N 3E227E

Hard to believe they sell a retrofit kit for a Gas furnace to a Customer....This is ahrd to advise you on with out seeing the schematic and if it is indeed intended for that furnace....the Spark mounting location is CRITICAL for safety so make sure that is correct above all.....OK The wire coming off the transformer and tied to the red wire going to the heat excghanger would most likely be a High Limit switch...cuts the gas off if the blower doesnt work etc or you would have a fire...so this switch must be in series with the transformer to cut power when the switch opens....the wire MV/PV coming from the "Electronic control box" needs to go to the New Gas Valve you should have which will have a termional marked MV/PV (Main valve/Pilot/valve) as your old one was for a standing pilot application and when you have electronic ignition you req a Gas valve for Intermittent pilot .....you should also have 2 more terminals on the valve MV and PV which will have seperate lines from the ignition control as well....basicvally there will be another wire coming from MV/PV going back to the transformer...make sure all wiring is correct and I would strongly advise you have a technician check your work before you attempt to use it....if wired incorrectly you could have a serious delayed ignition as its possible to power the main burner instead of the pilot if you wire it up wrong below is a typical spark wiring diagram....may not apply totally to your system but it will give you the general idea79f9627.gif

Posted on Oct 31, 2009

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Therinnaiguy
  • 1420 Answers

SOURCE: installed dayton nat gas hanging furnace in garage

Hopefully there is a wiring diagram glued to one of the panels to verify but on the transformer you will have 2, 110 volt wires. One is the power coming in (usually black wire) and the other is a common (white wire) and will be connected to other common leads. On the low voltage side of the transformer one wire will go to the thermostat then from the thermostat to the gas valve. The other side will connect to the gas valve. When the thermostat calls for heat it completes the circuit from transformer to gas valve back to transformer.

Posted on Dec 11, 2009

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Furnace does not start


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Trace the circuit from the transformer through each component (including the thermostat) and check for an open circuit at each location. Replace the one that has an open circuit.
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11_5_2011_12_12_10_am.jpg
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Your heater must use a millivolt gas valve with the 2 wire wall thermostat. The pilot generator does 2 things. It holds the pilot on and it produces voltages that operate the solenoid and open and close the valve when the room thermostat makes contacts. So what goes wrong with these? The pilot generator will sometimes hold the pilot flame but whn the 2 wires are touched together or you tun on the wall thermostat the whole thang just dies. That my friend is a weak thermopile generator. The other thang that goes wrong is the solenoid on the gas valve is open and therefore the gas won't come on. Their is also a fuse mounted on there that melts and kills the magnet that the generator holds in for the pilot.

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1 Answer

Installed dayton nat gas hanging furnace in garage and have 2 wires dont know where they go one came from the back side of the transformer it was twisted with the other wire


Hopefully there is a wiring diagram glued to one of the panels to verify but on the transformer you will have 2, 110 volt wires. One is the power coming in (usually black wire) and the other is a common (white wire) and will be connected to other common leads. On the low voltage side of the transformer one wire will go to the thermostat then from the thermostat to the gas valve. The other side will connect to the gas valve. When the thermostat calls for heat it completes the circuit from transformer to gas valve back to transformer.

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