Will an Aquastat work here??

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strmh

Member
May 24, 2008
61
Northern Maine
Suggestions please.

I would like to find a way to turn OFF power at a low temp (say 145 degrees) and then power ON at a higher temp (165 or so).

Is there a single controller out there that can do this?

I'm trying to steal some heat from the return pipes to the boiler, but I don't want the water cool enough to force the Danfoss bypass to fully kick-in thus shutting down the overall circulation throughout my system.

Make/model of potential units would really help.

Thanks.
 
strmh said:
Suggestions please.

I would like to find a way to turn OFF power at a low temp (say 145 degrees) and then power ON at a higher temp (165 or so).

Is there a single controller out there that can do this?

I'm trying to steal some heat from the return pipes to the boiler, but I don't want the water cool enough to force the Danfoss bypass to fully kick-in thus shutting down the overall circulation throughout my system.

Make/model of potential units would really help.

Thanks.

Ranco ETC-111000-000 Digital Temperature Controller is a popular choice. Its sensor has an 8 ft lead and can be strapped-on under insulation or inserted in a well. Any controller that has cooling mode, stout enough a relay, and an appropriate temperature range with hysteresis should do the trick.

--ewd
 
ewdudley said:
strmh said:
Suggestions please.

I would like to find a way to turn OFF power at a low temp (say 145 degrees) and then power ON at a higher temp (165 or so).

Is there a single controller out there that can do this?

I'm trying to steal some heat from the return pipes to the boiler, but I don't want the water cool enough to force the Danfoss bypass to fully kick-in thus shutting down the overall circulation throughout my system.

Make/model of potential units would really help.

Thanks.

Ranco ETC-111000-000 Digital Temperature Controller is a popular choice. Its sensor has an 8 ft lead and can be strapped-on under insulation or inserted in a well. Any controller that has cooling mode, stout enough a relay, and an appropriate temperature range should to the trick.

--ewd

--ewd

Big fan of the Ranco controlls... 30° adjustable differential... heating and cooling modes... and reliable as all getout.

cheers
 
Thanks a bunch for the information.

The Ranco (in cooling mode) looks like it will do exactly what I need.
 
[/quote]

Ranco ETC-111000-000 Digital Temperature Controller is a popular choice. Its sensor has an 8 ft lead and can be strapped-on under insulation or inserted in a well. Any controller that has cooling mode, stout enough a relay, and an appropriate temperature range with hysteresis should do the trick.

--ewd[/quote]

How would this work on Black pipe? Reason I'm asking is that I tried a Honeywell strap-on, on a pex pipe and it really didn't work all that good. The temp differance from the outside of the pex to the inside water temp was 40+ degs. Ended up scraping that hole idea. But I would like to shut off my cerc pump if the temp is below say 130 or so. And not really intrested in pulling pluming apart right now. So if my back up forced air furnace is not trying to heat up my water threw the heat exchanger.

Thanks
 
Trzebs13 said:
How would this work on Black pipe? Reason I'm asking is that I tried a Honeywell strap-on, on a pex pipe and it really didn't work all that good. The temp differance from the outside of the pex to the inside water temp was 40+ degs. Ended up scraping that hole idea. But I would like to shut off my cerc pump if the temp is below say 130 or so. And not really intrested in pulling pluming apart right now. So if my back up forced air furnace is not trying to heat up my water threw the heat exchanger.

Thanks

With plenty of insulation a strap-on sensor should catch up with the real temperature eventually.

If you're brave you could grind out a little trench 30 thousandths or so deep along the length of the pipe to give the sensor a lot more surface area to work with.

Then with or without the trench, use a little thermally conductive grease on the sensor, wrap the area with copper flashing, and fasten it down as tightly as you dare with a hose clamp. Then wrap the mess with your insulation of choice, the pros seem to like foam rubber. Be sure to extend the insulation plenty in both directions along the length of the pipe so heat can't escape easily by conduction along the pipe. Also it is traditional to do a few S-turns with the sensor wire under the insulation so that heat can't travel so easily along the wire and out from under the insulation.
 
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