furnace

rick_33

MODEL # GNE075B 12A2 . YOU MENTIONED RINGS NOT SURE WHAT THEY ARE.iF IT WAS CRACKED HEAT EXCHANGER ,WOULDNT THE CUSTOMER NOTICE A SMELL.AND WOULDNT I NOTICE A CHANGE IN FLAME PATTERN WHEN FAN COMES ON. IS THEIR A EASY WAY TO CHECK FOR CRACK WITOUT RIPPING UNIT APART i HAVE A CO DETECTOR

rick_33

I am working on a icp furnace,I checked gas pressure it is per spec on unit. I am getting a turbulent effect at burners ,causing rollout switch ,klixon 6 inches from burner ,tripping intermittently,If i adjust the pressure lower seeems smoother ,heaT EXCHANGER NOT PLUGGED ,RAN FOR FOUR YEARS NO PROBLEMS,.dOES ANYBODY HAVE THE CONTACT INFO FOR ICP.

Steve_35

ICP doesn't want to hear from techs.

Jeff Lawrence_25

Propane?

Or natural gas?

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rick_33

NATURAL GAS, i HAVE NEVER SEEN IT RUN EXCEPT FOR TODAY,THE FLAME PATTERN IS STEADY AT TIMES .THEIR IS NO DIFFERNCE IN FLAME PATTERN WITH FAN ON OR OFF. FLAME FLUTTERS EVERY NOW AND THEN IF THAT MAKES SENSE.

ryan_7

which model

Generally the rollouts trip if the heat exchanger has cracked or one of the rings has let loose. Let me know what model and maybe I can be of more help.
Ryan

Glenn Harrison_2

Easiest way to check is

Perform a Carbon Monoxide test in the flue pipe about five seconds after the burners fire, and after the main blower comes on. If you see a change of more than a couple PPM CO in either direction when the blower come on, the HX is breeched in some way, shape, or form.

It could be a crack, it could be a seam that has failed, or, assuming this is an induced draft furnace, 80% or 90% efficiency, with inshot burners, the crimp rings that hold the two halves of the heat exchanger cells together between the horizontal passages have broken allowing the middle of the cells to swell open between the halves.

ryan_7

rings popped

An easy way to see if any rings are popped, pull the blower and see if any pieces of the rings are laying on top of the blower unit, or sometimes in the housing. Customer proably would not notice anything as the heat exchanger is in a vacuum and CO usually does not escape into the home. We have not had very many GNE with popped rings. Also I have seen the liner sized too small (if it is vented into a masonary chimeny)

rick_33

UNIT IS INSTALLED INTO MASONRY CHIMNEY, NO LINER .tHIS WAS OIL TO GAS CONVERSION ,SHOULD CUSTOMER HAVE LINER .I KNOW THE BY PRODUCTS OF GAS USAULLY DETORIATE THE MORTAR. WOULD THAT CUSE ANY OF THE PROBLEMS I HAVE. THANKS

ryan_7

liner

Yes the chimney should have a liner, unless the furnace has the masonary chimney kit. ICP has one that would adapt to the gne. It basically adds an open air divertor to the chimney. And then you have to run B vent to the chimney and have a water heater installed too.
Anyway if you need a liner, and it was oil converted to gas, you should insulate the liner too, protects the liner from whats left in the chimney. We run b vent to the liner also.
Ryan