Aquastat, Timer and Tridcator

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mooseman100
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Stoker Coal Boiler: EFM 520

Post by mooseman100 » Sat. Apr. 22, 2017 10:25 am

I am getting ready to add a new aquastat, timer and tridicator to my efm 520.
Any favotires out there?

 
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Rob R.
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Post by Rob R. » Sat. Apr. 22, 2017 12:26 pm

That depends. Do you have a control wire run from the house to your outbuilding to signal a heat call to the aquastat?

I like Intermatic C8865 timers.

 
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mooseman100
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Stoker Coal Boiler: EFM 520

Post by mooseman100 » Sat. Apr. 22, 2017 1:09 pm

No control wire from house to timer. Thermostat in house calls for heat and opens valves for boiler water to circulate heat thru exchangers in duct work. Boiler is 110' from huose in separate building, all controls for it are there


 
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Scottscoaled
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Post by Scottscoaled » Sat. Apr. 22, 2017 6:26 pm

Intermatic C8865 timer with a Hydrastat 3250 Triple a-stat. Marsh tridicator.

 
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Rob R.
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Post by Rob R. » Sun. Apr. 23, 2017 6:57 am

I am a fan of the Hydrostat units, but since your boiler just maintains a set temperature without any link to the controls in the house, nearly any aquastat would work just fine.

A Honeywell L8124 or L7224u would work well, or you could even use a pair (one to control the temperature, one for a high limit control) of L4006A aquastats.

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