Question on Wiring

I'm sure this has been covered already but I can't find anything on it but I'll explain my situation. I'm installing my efm 520 in a separate building where it will heat my house and garage. I will have a pump in the building that I want to come on when I have a heat call in either building but not when the timer kick the stoker on. Right now I have my timer and a hydrosmart aquastat. Can anyone tell me how to wire it to keep the pump off when the timer comes on. Thank you

The timer won't turn the circulator on unless you have it wired incorrectly.

Hopefully it isn't too late to run a thermostat wire from your house and garage to the EFM. You can use that to signal a heat call from either building and start the circualtor via the C1/C2 terminals in the Hydrolevel aquastat.

It's not to late. Can it be wired so the hydrosmart turns on both pump and stoker while timer leaves the pump off?

Yes.

Ok thank you so much. I will be posting pictures of the install. I'm converting from an OWB so hopefully this makes my winters a lot easier from now on.

I don't know much about boiler wiring or outbuilding installations, but if the circulator is off for a while would that increase the risk of frozen lines?

Mike

Cummins junkie wrote:Ok thank you so much. I will be posting pictures of the install. I'm converting from an OWB so hopefully this makes my winters a lot easier from now on.

YAY!

Welcome to the wonderful world of under fed coal stoker boilers!

-Don

CJ

When you dig your trench for pipe, put in a 1 1/2" pvc conduit with a dozen pull strings in it for future unexpected needs . When you back fill don't use sand, rather washed #2 round stone . I will do a good job of draining your ditch of heat robbing ground water.
Put a ditch to daylight at the lowest part of the trench to ensure the thing stays dry. As far as insulation for the pipe there is several ways to go . I don't think which insulation is as important as keeping water away from it. And your gonna love your system

I've had my OWB since 2008 and have always had my pumps cycle with heat calls. Several people have told me I'm crazy but with how I plumbed the system there are enough heat calls between both buildings that the water gets pushed enough it doesn't get the chance to cool down that much. I tried running the main pump for the house constant for a short time and my wood consumption went through the roof.

The colder it is outside the more the pumps run. You can run them all the time, but as you have already observed it impacts fuel (and electrical) and consumption.

Can anyone tell me what the difference in between the hydrolevel for gas boiler and the one for oil. I picked one up for oil boiler just want to make sure it'll work.

The oil unit is the one you want.