oil boiler has its own aquastat, for contolling boiler water temp. Want to use 3250 for turning on the oil boilers circulator, when coal boiler temp gets down to say 150*, and back off at 175* degress, therefore 3250 will have to be mounted in coal boiler. I have the well for 3250 in coal boiler already... just not sure about using the circultor/boiler terminals to do so. Which one...boiler terminals or circulator terminals..... literature with 3250 is not all concise on what the circulator /own off sets(temps) are, what temp range circulator runs and if its settable for Hi/low adjustments. Boiler Hi-low terminals is straight foward for range setting.
1 hook coal boiler circualtor to circulator terminals in 3250. set to circulate at 175* and above continously(max temp 3250 goes to), until it hits circulator (lowlimit) shut off 175*
2 hook oil boiler circulator to boiler terminals in 3250 have it switch on at 150* (low limit) and shut back off at 174* (hi limit)
circulator control circuit in 3250 must have lmit sets for when to run and not. Do you know how to set them?
This is also supposed to be a staging aquastat.
tomorrows saaturday, will power up 3250 , no circs hooked up to it, and check terminals with voltmeter and try various settings, to try and figure it out .
Also nice install... like what i read about the efm's. another 5 years or so will be looking for one to get away from hand firing.