Burner Issue
Posted: Tue Feb 05, 2013 7:40 pm
Hi
I have an issue with a Nordyne MGBB-090ABPQ-06. I had it serviced in Nov '11, replaced the burner assy and the pilot assy. The original burner assy was fine , just had a baaaad tech and a cracked pilot tube. He really just wanted to replace the furnace from the get-go.
Ever since he worked on it, I have a strong odor outside when the furnace is running, I'm guessing unburned propane. I get the odor once in a while in the house too.
I had a different HVAC tech look at it in Dec '12 because the blower was cycling badly: run for 10-20sec, shut off for 45-60sec, repeat. I replaced the fan switch, problem persisted. He checked everything out, and it was running too cool. His best guess was the valve was sticking and not allowing full gas flow. He checked the interior of the house while the furnace was running and found no increased CO2 levels. I verified this was to make sure the heat exchanger was still good. I swapped in the old burner, just to eliminate the new burner assy - it was not the problem. I replaced the valve (and newer burner assy), and no more cycling, seems to work just fine now; but I still have an odor outside while its running. The valve was properly set up; flipped the NAT/LP fitting so the LP arrow is facing the valve.
I just ordered a new #36 orifice, its the only thing I can think of that would cause too much propane to be flowing; can only guess the 1st tech messed with the orifice for some reason.
Maybe he installed a NatGas orifice?
It doesn't really appear inside like its running really rich either, the only yellow flame I get is right around the pilot assy, which the tech said is normal.
Any ideas?
Thanks!
I have an issue with a Nordyne MGBB-090ABPQ-06. I had it serviced in Nov '11, replaced the burner assy and the pilot assy. The original burner assy was fine , just had a baaaad tech and a cracked pilot tube. He really just wanted to replace the furnace from the get-go.
Ever since he worked on it, I have a strong odor outside when the furnace is running, I'm guessing unburned propane. I get the odor once in a while in the house too.
I had a different HVAC tech look at it in Dec '12 because the blower was cycling badly: run for 10-20sec, shut off for 45-60sec, repeat. I replaced the fan switch, problem persisted. He checked everything out, and it was running too cool. His best guess was the valve was sticking and not allowing full gas flow. He checked the interior of the house while the furnace was running and found no increased CO2 levels. I verified this was to make sure the heat exchanger was still good. I swapped in the old burner, just to eliminate the new burner assy - it was not the problem. I replaced the valve (and newer burner assy), and no more cycling, seems to work just fine now; but I still have an odor outside while its running. The valve was properly set up; flipped the NAT/LP fitting so the LP arrow is facing the valve.
I just ordered a new #36 orifice, its the only thing I can think of that would cause too much propane to be flowing; can only guess the 1st tech messed with the orifice for some reason.
Maybe he installed a NatGas orifice?
It doesn't really appear inside like its running really rich either, the only yellow flame I get is right around the pilot assy, which the tech said is normal.
Any ideas?
Thanks!