Proper fan switch and timer settings for AF150?

Proper fan switch and timer settings for AF150?

PostBy: agcowvet On: Mon Jan 06, 2014 11:37 pm

Since I have tied furnace into current duct system (pieces from old plenum, 8x24 duct, had to neck that down to 8x18 to fit oil plenum) the fan sometimes comes on for a minute or so every now and again. Did not have this issue when heat was more free to escape from plenum into basement. Happens most often shortly after a timer run but not always associated with this.

I upped the FAN ON setting from 125 to 135-140, which helped, but still does it from time to time. I have not changed the FAN OFF setting, which remains at around 95.

I also pulled one pin from timer, now it's on 1:45 every half hour.

Suggestions? Pull another pin or 2? Up ON temp? Bigger duct so heat gets into house via gravity flow more easily? (likely the best solution but not in the cards just yet, have some more pressing issues to sort first)
agcowvet
 
Hot Air Coal Stoker Furnace: efm AF150
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Newmac NL-2 (oil)

Re: Proper fan switch and timer settings for AF150?

PostBy: wilder11354 On: Mon Jan 06, 2014 11:56 pm

How is the furnance working as far as heating the house? I have no kowledge of system, curious if that furnance is heating well enoughfor you?
wilder11354
 
Hand Fed Coal Boiler: Harman SF260
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed

Re: Proper fan switch and timer settings for AF150?

PostBy: agcowvet On: Tue Jan 07, 2014 12:07 am

Works a treat!

I have the feed set around 4-5 teeth, there's plenty of room for more input, but it doesn't need it. I don't have any way to know how much time it's on or off but it can't be on more than 2/3 the time (guessing!) Real nice and even too, there's always a little bit of heat trickling out of the vents with the blower off. The original "modulating/variable speed hi-efficiency furnace" :lol:

Stack temps (magnetic thermometer) running 170-200ish at full fire.

Had to speed up the blower when I tied it into the duct system, it wasn't moving enough air, and furnace was smelling 'hot'. Still need to check temp rise with duct tie in place; I suspect it's close enough, air at registers seems very similar to oil furnace output temp, maybe a little cooler.
agcowvet
 
Hot Air Coal Stoker Furnace: efm AF150
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Newmac NL-2 (oil)

Re: Proper fan switch and timer settings for AF150?

PostBy: wilder11354 On: Tue Jan 07, 2014 12:18 am

what temp you maintaing in the house itself? fiddling and fussing with it a little at a time is what we do to make them work as needed when needed. holding 70* in my house.. No problem last cold snap at -4* in AM's, hope it holds true with this little bit colder snap.
wilder11354
 
Hand Fed Coal Boiler: Harman SF260
Coal Size/Type: nut or pea, anthracite
Other Heating: crown oil boiler, backup.if needed