Harman SF3500 Question (How to Cool Fire Down)

Post Reply
New Member
Posts: 4
Joined: Fri. Nov. 04, 2011 1:59 pm
Stove/Furnace Make: Harman
Stove/Furnace Model: SF 2500 A

Post Fri. Nov. 09, 2012 7:23 pm

http://www.harmanstoves.com/Products/SF-3500-A-Wo ... rnace.aspx

This thing is driving me NUTS. 2nd year operator and can't get it to cool down enough. Seems if I close the ash pan dial down, fire goes out, open it too much, it's 80 degrees in here and fan blows constantly.

How about the dials on the loading door????

Anybody have one that can offer me a good starting point on how much draft on bottom and how much to spin the dials open?

I'm going CRAZY

User avatar
Rob R.
Site Moderator
Posts: 11502
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Fri. Nov. 09, 2012 7:24 pm

Dials on the loading door should be nearly closed.

User avatar
Posts: 1066
Joined: Sun. Oct. 30, 2011 5:44 pm
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size
Location: Pottstown,Pa

Post Fri. Nov. 09, 2012 7:36 pm

That's a big unit. How big of house are you trying to heat.If it's a smaller home or really well insulated you may need a firebox reducer,to calm down the heat output while keeping a hot fire going.Is this a new furnace and are all the gaskets tight.

User avatar
Posts: 8416
Joined: Wed. Nov. 16, 2011 9:51 am
Hand Fed Coal Furnace: Overmodified/Bored out Clayton 1537
Coal Size/Type: Anthracite/Awesome Size
Location: Olean, NY

Post Sat. Nov. 10, 2012 11:32 pm

Sounds like a draft issue to me.. Do you have a barometric damper and a manometer installed?
I had the same problem with my furnace yo yo-ing like that until I installed a baro damper.. :D

User avatar
JB Sparks
Posts: 842
Joined: Sun. Oct. 19, 2008 8:09 pm
Stove/Furnace Make: Harman - Chubby
Stove/Furnace Model: Harman: SF160 - Chubby Sr.
Location: north central Mass.

Post Sun. Nov. 11, 2012 5:33 am


I have a SF 160 Harman, pm me your phone number,if you want, and I'll talk you through the set up of these Harmans.


Post Reply

Return to “Stoker Coal Furnaces & Stoves Using Anthracite (Hot Air)”