Making a simple warm weather shut down for an oil fired steam boiler

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Old 10-10-12, 07:51 AM
T
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Making a simple warm weather shut down for an oil fired steam boiler

Would like to place a simple warm weather shutdown switch in line with the cable from the thermostat within the boiler room for a small commercial oil fired steam boiler.

We can easily install a sensor outdoors in the vicinity of the boiler.

Thought of using a klixon switch, an aquastat and things like that. Surely someone's already done this.... what works well?
 
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Old 10-10-12, 04:22 PM
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I was going to suggest the temperature controller that I used, the Ranco one, for the oil heater. But then I started thinking about whether or not it would be a good idea to leave a relay energized the entire heating season.

I would want something with a 'latching' relay in it, like thermostats use. They typically don't hold the coil voltage, it's just a quick pulse to latch, and another to unlatch.

Maybe you can use a cheapo thermostat if you can mount it outdoors in such a way that the elements won't get to it?

Or even a simple non-electric model?
 
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Old 10-10-12, 05:12 PM
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I have a "constant circulation" hydronic heat system that utilizes a Honeywell T675A Remote Bulb Commercial Temp. Control for essentially the same purpose - to shut off the heat (in my case, the heat circulator) during warm weather (i.e., the switch breaks on "temperature rise"). The circulator runs 24/7 during the winter. The control has to be at least 20 years-old and I haven't had a problem with it.

Just something to consider...
 
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Old 10-10-12, 05:18 PM
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Thanks Rock, I like that solution... that's what I was thinking of when I mentioned the 'simple non-electric' solution. You da man...
 
 

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