My dayton NG heater fan will not shut off properly
My Dayton natural gas garage heater heater fan will not shut off properly after flame shut down and the unit has cooled. If left alone with only the pilot flame lit, the fan will randomly come on and stay on indefinitely. I just bought and installed the unit and wired-in a new battery operated thermostat.
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Re: My dayton NG heater fan will not shut off properly
Sounds like a bad fan switch. The switch is located on the heat exchanger and is 110 volt bi-metal switch. Follow the wires from the blower going back to the heatexchanger. Graingers can get you a new switch if you give them your model number. www.grainger.com.
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You have to contact the manufacturers rep in the community to verify that the particular model of Dayton heater has the capability of NG to LP conversion. If it is, the natural gas kit will include a new set of brass 'spuds'...typically referred to as 'orifices'....for the main burners. The size of the hole will be considerably larger because NG contains less btu per cubic foot than LP gas.
There will be a replacement pilot orifice for the pilot assembly. Removed and installed usually a 1/2" and 7/16" wrench. This orifice will also have a larger diameter opening.
There should be a regulator to match the 100% redundant gas valve that is in your heater. Note though, that there may be several regulators in the kit to match any one of several brand gas valves that could've been installed on your heater....Robt Shaw, White Rodgers, Honeywell. They will NOT interchange with one another. Follow the directions closely to ensure installation is done correctly...you are working with a volitile, explosive gas !!!!
There may or may not be a set of air shutters to fit over the ends of the burners for primary air adjustment. Natural gas may require a bit of air adjustment to get the proper flame.
Thoroughly leak test everything when done, then leak test again.
If you feel you are in over your head, you probably are so contact a reliable service organization to do it instead. But at least you now have an idea of what is involved.
Check heat exchanger for cracks or holes which will cause the fan to blow out the flames. The flame sensor on the pilot or burners has to be in constant contact with flame to operate normally. If the flame is put out by a cracked exchanger the exchanger or furnace needs to be replaced.
Hi, The heater is not proving the flame...and shutting down on safety... Check the flame sensor and all connections of the ground from the burner to the ignition control... The control may also be bad... for additional help with Dayton units go to www.grainger.com they sell that brand and have their own repair help techs.
if the gas pressure is good on inlet and outlet of valve u might wanna chk the burner trays and manifold for flakes, dirt, spider webs ect... once u kno the passages are clear from obstruction you can focus on the mechanical. (sounds like gas valve may be getting weak and not able to open fully)