Gas and Oil Home Heating Furnaces - Propane wall furnace vent and flue

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PeterAL
10-23-06, 05:12 AM
I have an old propane wall furnace that has provided many years of reliable service and is currently exhausted into an old chimney.

I'm removing the chimney and wish to exhaust the combustion gas through its own flue to the outside.

What are the requirements for flue pipe? I've heard from a variety of "experts" that 4" stells pipe is satisfactory, B vent is needed and someone even mentioned a plastic pipe that he "heard" of.

Thanks in advance for your help.

Peter

Ed Imeduc
10-23-06, 02:04 PM
For sure you have to vent it to the outside with the B vent pipe . Like the one guy said. dont use anything else

" B vent is needed "

ED ;)
hankhill6018
10-23-06, 05:11 PM
Like Ed said, if it was vented into a masontry chimney, you will need B vent as PVC (plastic?) is only good for certain types of induced draft furnaces.

To achieve the proper draft, you will need to go up above the roof line from where the B vent meets the roof about 5 feet. The termination cap should also clear any part of the roof horizontally by 10 feet.

If you can provide the make on model of the furnace it would be more helpfull.

PeterAL
10-23-06, 09:23 PM
I spoke to a local furnace and chimney supplier and he too specified B vent for this application.

The unti is

Siegler
Model MIII85WF-D
S/N 6169

Its made by a company in Orillia, Ontario, Lear Siegler, which appears to have some connection to Lear Robotics!

I have one further question...
Last winter I noticed that when i had the thermostat turned down around 55 F the furnace would not stay on. It would light the burner, start the fan and run for a few seconds and then shut down. It would repeat this cycle until I turned the thermostat up to a high temperature, where it would work fine.

Any ideas on what this migth be?

Thanks for your help.
sgthvac
10-23-06, 09:57 PM
What type of t-stat? If it is an old round mercury stat you probably should replace it.
PeterAL
10-24-06, 09:00 AM
It is a mercury T-stat, but not a round one.

When I open the front I see an adjustment which has printed on it "longer cycle" and graduations running from .15 to 1.0. Its currently set at .4.

Could this setting be causing the conditions I noted above?

If I replace this thermostat should I get an electronic one? Will is be a simple one-for-one replacement?

Thanks