Mike Lamb Posted March 9, 2015 Report Share Posted March 9, 2015 I inspected two Lennox furnaces in the same building. Both are the same age and model installed at the same time by the same guy. The far left burners did not fire on either one. Might someone intentionally do this and for what reason? Coincidence? Click to Enlarge 38.17 KB Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted March 9, 2015 Report Share Posted March 9, 2015 It's hard to get anything on the far left to work. Boom cha. Spiders? Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted March 9, 2015 Report Share Posted March 9, 2015 1. Damaged/bent or clogged ignition crossovers. Click to Enlarge 39.05 KB 2. Clogged orifices. 3. Low gas pressure. If it's the last burner after the valve on each furnace, I would investigate #3 first. Quote Link to comment Share on other sites More sharing options...
MMustola Posted March 9, 2015 Report Share Posted March 9, 2015 Chad, That was funny! Quote Link to comment Share on other sites More sharing options...
AHI in AR Posted March 10, 2015 Report Share Posted March 10, 2015 Chad, That was funny! Yeah. I damn near did a spit take. Quote Link to comment Share on other sites More sharing options...
Marc Posted March 10, 2015 Report Share Posted March 10, 2015 Chad, That was funny! Yeah. I damn near did a spit take. Somebody tell me this isn't going to morph into 'The Interview'. Marc Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted March 10, 2015 Report Share Posted March 10, 2015 Spiders like the oriface tube on my antique oven burner. I have to clean them out at least once a year. The burner fires but its a sooty smelly affair. It would have to be a pretty big spider to completely block that tube. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted March 10, 2015 Report Share Posted March 10, 2015 I'd say he's got the end orifice/ opening capped off. Otherwise, the flame rod you see on the functional far left burner would probably be placed @ the inoperative burner further left. At least most of them are. Typically, the heat exchanger opening is capped when not in use though.... They're taking a 80k btu furnace and turning it into a 60k btu unit. That flame rod proves flame for the burner "circuit". It needs to be @ the furthest burner over from the ignitor so that if all burners don't ignite, the gas valve closes. Otherwise, there'd be a risk for delayed ignition, which can be quite fun. I tried to come up with a more clear explanation, but keep getting side tracked. Quote Link to comment Share on other sites More sharing options...
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