Improving a Suburban Furnace
SF20 in my case. It heats OK but it's just so **** noisy. Has anybody modified the furnace to install a quieter fan? Less of an amp draw would be nice too. We don't boondock enough to justif...
Forum Discussion
Simple answer is you can't.
You can't put a slower fan or fan motor (which would be quieter) in there.
You can't slow down the motor as the furnace WILL over heat and not to mention the same motor serves a dual purpose. One side of the fan blower is for the inside and the other side of the fan blower is the draft inducer for the burner.
Alter either and now you have a non safe or non functional furnace.
Additionally the furnace has a safety switch called the sail switch which will prevent the burner from firing if there is not enough air movement, don't bypass that..
2oldman, that is a pretty dangerous path to go down and I highly doubt you are going to be able to pull this off safely or reliably and not to mention it would take a considerable drop in RPM to reduce the fan noise.. Any drop in RPM will affect not just your inside fan but the draft inducer fan for the burner since both fans SHARE the same motor.. If I were you, I would PM the resident RV furnace guru Dougrainer BEFORE attempting. I suspect he will pretty much say the same thing I have though. Not to mention it will be one whopper of a resistor as far as wattage goes..
You can't put a slower fan or fan motor (which would be quieter) in there.
You can't slow down the motor as the furnace WILL over heat and not to mention the same motor serves a dual purpose. One side of the fan blower is for the inside and the other side of the fan blower is the draft inducer for the burner.
Alter either and now you have a non safe or non functional furnace.
Additionally the furnace has a safety switch called the sail switch which will prevent the burner from firing if there is not enough air movement, don't bypass that..
2oldman, that is a pretty dangerous path to go down and I highly doubt you are going to be able to pull this off safely or reliably and not to mention it would take a considerable drop in RPM to reduce the fan noise.. Any drop in RPM will affect not just your inside fan but the draft inducer fan for the burner since both fans SHARE the same motor.. If I were you, I would PM the resident RV furnace guru Dougrainer BEFORE attempting. I suspect he will pretty much say the same thing I have though. Not to mention it will be one whopper of a resistor as far as wattage goes..
