I would think that the flame by the orifice would indicate that the gas
valve is not shutting off completely. This would be a good reason to
change the valve or the water heater.
bill
25 ft Trade Wind in WV
> All,
>
> Sorry to be asking such a stupid question but I haven't a clue how to
> adjust the air mix for my factory original six-gallon Bowen water heater. I
> know that the slotted collar with set screw is used to achieve the proper
> mixture but I really don't know what I'm supposed to be looking for to get
> the right mix.
>
> Additionally, should there be a flame coming from the orifice in the
> right side of the Unitrol thermostat that the air mixer slides over when the
> burner is not doing its thing?
>
> The heater cycles off and on just fine but today for the first time I
> noticed that there's a small flame coming from that Unitrol brass orifice.
> If I blow the blue flame out a yellow, sooty flame appears at the other end
> of the tube adjacent to the pilot light.
>
> What does the large slotted screw do at about 2:30 o'clock relative the
> the large red temp knob control? Should I turn that to see if it eliminates
> the orifice flame?
>
> I just happen to have a spare Unitrol from another identical Bowen
> heater but before changing the present one out with this questionable spare,
> I'd like to get some thoughts.