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ruud furnace problem

Posted by sonny roark on February 15th, 2003 10:05 PM
In reply to Gas Furnace Problem by Marc Stadler on November 11th, 2000 11:02 PM [Go to top of thread]

sir: i`m installing 2 ruud 75000 btu propane condensating furnaces in attic-- problem:burners stay lit for maybe 5 min,then go out fan continues to run,have to break the circuit for fan to go off. roll out switch is tripping, unit will run ok if i take blower compartment door off (gets more return air) seems like i dont have enough duct for supply air and heat exchanger is overheating, trunk line is 16" flex with 4- 10" flex going to 10 x 10 cans w/8" throat and 1- 8" for bath do i need more ducting?

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