By Robert Gordon from albuquerque NM on November 15, 2011
installed 35,000 btu single wall furnace. Works fine, except the pilot goes out after about 24 hours of operation.
Vented directly up through flat roof with 9 feet of double wall vent pipe that is used directly from the furnace. Typical rain cap installed.
No CO and furnace seems to operate normally except when the pilot goes out.
Do you know what the problem is? The venting diagram shows insulated section of vent on roof, and transition to larger pipe. I did not do this. Is this a problem with venting, causing the pilot to go out? The voltage measurements are excellent showing the thermopile is working.
By Collin C. - NFI Master Hearth Professional on November 15, 2011
Answer:
Most commonly, a misadjusted thermopile is what causes the pilot to extinguish. As you mention, the voltage reading are within specification, so this would not be the issue.
Improper venting can cause this issue, but it is usually not a routine occurrence. The pilot will usually go out at random and not at regular intervals. Please advise if it is going out at exactly 24 hours or if there is a little more variance, say by a couple hours.By brad hoffman from las vegas on November 15, 2011
Do you sell the vent to this? It's the type b vent system.
By Collin C. - NFI Master Hearth Professional on November 15, 2011
Answer:
We do indeed carry the type b venting for this unit and can assemble a quote for the needed pipe if you like. The unit also requires a type bw adapter to pass the pipe from the stud cavity the unit is mounted into, through the wall header and into the attic.