wood boiler aquastat what do i need?

fryfour

hi
im trying to figure out what type of aquastat i need to run a circulator pump on a wood boiler. i want the pump to come on at say 160 and stay on no matter how hot boiler gets. the one i have can do that buts cuts off when it gets hotter . is there one made that doesnt have a differential? thanks

Robert_25

What model aquastat do you have? Some of them have three terminals, and can be used to make on rise (what you want), or make on fall.

An L4006B will do what you want, most of them have an adjustable differential.

fryfour

i have a l4006b. It doest have the adjustable differential dial? i think its fixed .. so if i have it power the pump at 160 will it stay powered on until the water temp drops back to below 160 or does the differential cause it to loose power if it goes higher than the differntial?

leonz

Can we back up a bit here?

What brand of wood boiler do you have and what model?

Do you have a triple aquastat to control the boiler to begin with?

You need to download the installation manual for your L4006B before you do anything.

Jamie Hall

I hope you have some sort of emergency dump zone for that boiler which will work even without electrical power...

jesmed1

Don't be this guy.

https://coalpail.com/coal-forum/viewtopic.php?f=70&t=39978

leonz

I forgot about that "Incident" jesmed1 it was down right ugly.

fryfour

its a mascot wood boiler.. i dont have a triple aquastat..... this is not going through any thermostat ...it will heat when i build a fire. all i want is circulating pump to come on at set temp and go off at when it gets bellow that temp and yes it has saftey blow off valve on top of boiler

EBEBRATT-Ed

@fryfour

You need a reverse acting aqustat (one that makes contact on a temperature rise) L4006b1165 will do it if you want an imersion aqustat. If you want one that straps on the pipe those are available as well

fryfour

thanks Ed... that sounds good , i can set it to come on at 160 degrees and it will stay on up to 200 degrees and not shut off utill boiler temp goes back down below 160 degrees ? correct

hot_rod

is the boiler outside? What about freeze protection?

Id use an electronic setpoint control, much more  adjustment and they are both NO and NC

Make or break on temperature rise, by selecting heating or cooling

Ranco, Johnson Controls, Honeywell, etc

Jamie Hall

A temperature and pressure safety valve is a necessity, yes. However, in my professional opinion it is not adequate for a solid fuel fired boiler, as it will not protect the boiler in the case of an excessive fire -- which will happen, sooner or later. Unless the boiler is to be attended at all times, and has a positive way to shut off the draught to the fire, it must have a dump zone capable of absorbing all the energy from a full load of fuel -- how big that is depends on the boiler fire box -- and that dump zone must be set up so that the boiler can thermosiphon into it without depending on pumps.