I have a Dayton "Fuel Trimmer", model 3E438A, is it possible to still find a user's and installation manual on this furnace? The problem started after a service person pulled the blower to clean the secondary heat exchanger. After the blower was put back tha air flow sounds choppy (not smooth). We thought it might be insufficient air return (cleaning the exchanger appears to have increased the demand for return air), but the air flow sounds choppy (or maybe it's the blower) even if the furnace is run without the bottom panel on. I had the company come back and they could not figure out the problem. I guess there is the possibility that a wire came loose and was put back on the wrong terminal, but I doubt it. It is really too bad that the service people that I have used can not even read the schematic on the inside of the upper panel. Anyone have any suggestions or thoughts on this. Thanks, John
welcome to just answer
I am Rob And I will see if I can dig up a manual for you>
no luck finding a manual
I am not sure what choppy means?
could the tech have knocked a balancing weight off the blower?
No, I do not think this is a balance issue, the fan blade is not wobbling. What I mean by choppy is instead of the airflow sounding smooth, steady and of the same volume, it sounds as if there are varing volumes (pockets of air) or the airflow is oscillating (chugging).
Thanks for giving me the opportunity to help! It almost sounds like the blower may be running backwards. Is there airflow coming out of your supply registers?
Yes. The show at the registers is fine.
I would have them recheck both the secondary and if you have air conditioning, the A-Coil. It sounds like somewhere your air is getting partially blocked. This would cause the choppy airflow you are experiencing.
Could this also be caused by interrupted electrical current to the blower, because it sounds as if the blower is cutting in and out.
It's possible. If the guy that pulled it out caused a wire to be making poor contact.
It's also possible if all the wiring is good that you have either a defective blower motor (going out) or a problem with the board that sends power to the blower motor.
Thanks Tim. I have been very unfortunate with the ability of the service people that have to my home (they do not appear to be knowledgable) i.e. can not follow the schemetic on the furnace, nor can they trace current or continuity in the wiring. What should I be askig for in the way of credentials of the service person to increase my likelyhood of having the problem resolved. This will be my last question-promise.
One thing that has been more common in our industry now is to ask for a NATE certified technician. This means that he (or she) has passed a series of competency tests which show that he is knowledgeable in his field. Sort of like being GM certified when it comes to cars.