Furnace burner cycling on & off
Brought home our new TT last week to prep for a combination maiden voyage and anniversary trip. Turned furnace on, blower started, ran for a period of time then the burner lit. Placed hand over fl...
Forum Discussion
Cycling of main flame is indicative of high limit switch operation.
The high limit switches can be 130*F, 170*F or 190*F depending on make/model.
Temperature Rise (TR) affects cycling.
The typical RV furnace has an average 90*F TR.......return air temp subtracted from discharge air temp (measure after furnace has been operating 5 mins with a fast acting thermometer).
They are rated for a maximum of 130*F TR.
140*F at discharge could be tripping high temp limit. (what is return air temp?)
Problem could be restricted air flow, could be high propane pressure, could be faulty high limit, could be slow motor speed
Which brand & model?
The high limit switches can be 130*F, 170*F or 190*F depending on make/model.
Temperature Rise (TR) affects cycling.
The typical RV furnace has an average 90*F TR.......return air temp subtracted from discharge air temp (measure after furnace has been operating 5 mins with a fast acting thermometer).
They are rated for a maximum of 130*F TR.
140*F at discharge could be tripping high temp limit. (what is return air temp?)
Problem could be restricted air flow, could be high propane pressure, could be faulty high limit, could be slow motor speed
Which brand & model?
