strategy for operating 520

Re: strategy for operating 520

PostBy: stoker-man On: Sun Dec 22, 2013 6:47 am

Whether you run at 4 teeth or at 8 teeth, the aquastat is only interested in reaching its setpoint. Your house isn't going to be any warmer or cooler. What will happen is that you are overfiring and losing more heat up the chimney. You will reach your setpoint sooner, but will have short cycling all day long.

Better to set back the thermostat less due to the long recovery times with coal. You may not be saving any money either with a big setback.
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: strategy for operating 520

PostBy: Ziggy On: Tue Dec 24, 2013 11:34 am

Just checking in to see how you're doing on this matter. I am in Harleysville, pretty close to you. You're welcome to take a look at my 520 to see how it compares to yours in operation or I would be happy to run over and look yours over.

The 520 is capable of a pile of heat and should have no problem meeting your needs. I would think if you had too little baseboard length, you would just bounce of the hi limit setting rather than extra long run times. Watching the boiler temp throughout the heating cycle would tell a lot about what is happening and how to improve performance.

I would recommend starting with a fixed temp on your thermostat to evaluate your system and then move on to variable settings, but only with a programmable thermostat that is capable of anticipating a temp set point/time. Otherwise, your temp "feel" will always be behind.

Do you have a manometer set up to check for draft, specifically overdraft? Maybe the heat is all going up the stack? I run mine a .020" to .025" with good results.

Anyway, let me know, I'll help however I can.

Stoker Coal Boiler: EFM 520
Coal Size/Type: Rice
Stove/Furnace Make: EFM
Stove/Furnace Model: 520