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Failed Furnace installer blames propane supply
Installed a new Bryant gas furnace. Ran 39 days heat exchangers filled with soot and the air intake from concentric melted a top the burner box. initially the furnace ran on two 100 lb propane cylinders with 11" wc and after nine days they were both empty. Filled both and 5 days later the heater started to have problems on the cold nights 20* or below not able to maintain temp. 20 days after initial firing of furnace 100 lb propane cylinders replaced with two 300lb cylinders. Thirtieth day the furnace blew smoke like haze into home and produced a foul odor (burning pvc) again cold night. Next day refired furnace all seemed well mild day and night temps. On 39 day odor came back and system malfunction.Had to replace entire furnace. Installer changed the routing of the exhaust flue and also condensate line leaving furnace. Also hooked up heat pump at that time and set the cut off at 30* before firing on gas. Concerns what really went wrong with first furnace?Did installer set the switch over to gas too low (jersey shore) to keep the furnace running mostly on the heat pump to avoid it happening again?
Additional information: Bryant BY-355CAV060100 95% modulating natural gas furnace, authorized dealer installer, concentric for fresh air, propane conversion, efv gas correctly sized 3/4" gas connector, downflow application, cased up/down flow airconditioning coil, evolution thermastat, condensate to drain.
Bryant will not even look at it for possible equipment failure. Installer has given statement that the furnace was run on a 30lb cylinder and avised homeowner that this could cause equipment failure.
Thanks in advance more info please ask