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Old 10-30-2008, 01:01 PM   #1
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Thermostat question?


Hi have a thermostat question, I have a 7 day programable one. I have set it for wake up Mon-Fri 5:00am leave 7:00am, Return 5:00pm and sleep at 10:00pm. Now I noticed that the boiler kept kicking on yesterday night around 11:00pm, and around 1:00am. The temperature must have gone down and she kick on which is Great. But my question is, will the boiler kick on when I am not there and the temp goes down?

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Old 10-30-2008, 05:23 PM   #2
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Thermostat question?


Depends on what the tstat is controlling. Is it controlling the burner? The Pump? When I had HW systems, I would install a controller that would allow the boiler to sleep during the day, only firing up about 1/2 hr before a load time (say, fire up around 6:30 for a 7AM temp call). Also, the controllers I would use always were designed to work with zone valves (constant flow primary systems).

Lastly, I would turn the HW temp down to about 160 to 165 (from 180).

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Old 10-30-2008, 07:53 PM   #3
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Thermostat question?


your wake,leave,return,and sleep temperature settings will judge if the boiler cycles in the leave...sleep times if your runnig say 68F in wake and return and dropping to 66F it could cycle.if you drop it to 60F you won't hear a cycle.keep in mind that it's an anticapating stat,and it gives you the higher temp at the time you set.that 5AM to 7AM morning temperature can be narrowed down to less then 2 hours at 68F running try 5:15AM to 6:15AM for the house willl hold that hour of heating until the troops leave.if you get up in the night and hear the boiler running that's it anticipating the wake up temp....the further away the room temp. is from it the more it will cycle on.if you happen to come home early and you'll feel the leave temprature then thinking the boiler not working.
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Old 10-30-2008, 08:31 PM   #4
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Thermostat question?


Does your boiler heat your domestic hot water?
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Old 10-31-2008, 05:04 AM   #5
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Thermostat question?


If the temp in the house drops below the thermostats set point, yes, it will run your boiler.
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Old 10-31-2008, 08:33 AM   #6
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Thermostat question?


Some thermostats also get the temperature to the set point by the set time (mine does this).

For example, if you have your thermostat set to 70 for 7AM, the furnace might kick in at 6:45AM, such that by 7AM the house is at 70.

Aside from that, as stated above, if your leave is set for 65, for example, and while you are at work, the house drops to 64, your heat will turn on.

Some thermostats also have an "odometer" which keeps track of how many hours your furnace has run (mine does not). From this, you would be able to gauge how much your furnace is turning on during the day as you change settings. You would need to check your manual if you have this feature.
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Old 10-31-2008, 10:04 AM   #7
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Thermostat question?


Some body helped a scorched air only tech here. Boiler temp has to stay a certain temp to be ready for a heating cycle

I think a hot water boiler's standing temp is like 130F*, yes?, no?

And the aqua stat keeps the boiler water from falling below the 130*F set point. Now my question is are gravity systems still being installed (IE. heating loop in the floor for the whole home.

Now if this system is still used does an aquastat till maintain water temp when no heat is actually being called for or does the burner only turn on during a call for heat
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Old 10-31-2008, 11:34 AM   #8
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Thermostat question?


Thanks Guys, Steam heat, no hot water from boiler. Everything working fine, just wanted to make sure. It does make sense I guess if temp goes down, boiler will cycle. I guess the programming on the thermostat is so that the boiler is not on all day, but if the temp goes down , then I guess the boiler will kick in to keep house at set temp.
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Old 10-31-2008, 02:36 PM   #9
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Thermostat question?


Cold start boilers are still installed.
Both for hot water heat, and steam.

Prolonged operation with low return water temp is what most manufacturers warn against.

Basically, only boilers with either a dual, or triple aquastat maintain temp 24/7.

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