Programmable Thermostat - Problem

Hi All,
I have a 5-1-1 programmable thermostat, but it's driving me crazy.
I think it might be too sensitive. For example. If it is set for 21 degrees and the temperature drops to 20.9 to furnace cuts on. I have cast iron rads (oil/hot water) so anyways the temperature drops to 20.9 and the furnace cuts on and stays on until it reaches 21 degrees. This only takes like 40 seconds or so. The 30-40 seconds later the temperature drops by .1 back to 20.9 then the furnace cuts on and so on and so on and so on.
Is the thermostat (Noma) too sensitive? I mena the furnacing cutting on and off every 40 seconds is driving me crazy. You know the noise of the furnace and all. To me it's just burning oil. The house is warm and could use a drop or 2 before it kicks back on but every .1 drop in the temperatre is a little mush.
This is my first time having a programmable thermostat. Is this normal. The furnace is a Veismann and has been serviced recently and is actually only 3 years old.
Any advice or comments?
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Doobielicious wrote:

There sound be an adjustment for that. Look for anticipator or for a degree spread adjustment. They are two different things, and I can't tell which one may be set or functioning improperly.
--
Joseph Meehan

26 + 6 = 1 It's Irish Math
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Hi Joseph, hope you are having a nice day
On 16-Feb-05 At About 17:58:45, Joseph Meehan wrote to All Subject: Re: Programmable Thermostat - Problem
JM> Doobielicious wrote: >> Hi All,
>> I have a 5-1-1 programmable thermostat, but it's driving me crazy.
JM> There sound be an adjustment for that.
Not really, not all of them have that adjustment.
JM> Look for anticipator
An anticipator doesn't control the on temp it controls how quickly the unit shuts off.
-=> HvacTech2 <=-
.. URA Redneck if you keep your thermostat on 85 in the winter.
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This is Turtle.
You need to check the paperwork for the thermostat and see about the settings of the thermostat as to being set up for heat pump, straight electric heat, or gas heat. Some have switches on them that your suppose to set to burn different fuels like natural gas or oil or Electric heat.
Now it sounds like you got it set for electric and your burning oil. When all else fails -- read the instructions.
TURTLE
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Are you sure that the problem is with the thermostat, and not some problem with the furnace? Shove the heat setting all the way up to 90, and if you still get short 40 second bursts while the house comes up to temp, then it's a furnace problem.

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My programmable stat has a setting called "temp swing" and it is in degrees. If I set the swing temp to 3 degrees and set my set temp to 70, the furnace will come on when it reaches 67 and shut off when it reaches 73. Obviously, that's kind of extreme. I have the swing set to "1" and I get a reasonable cycle.
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I cant address your problem but can say short cycling is killing the life of your Boiler controls and it never reaches its rated efficiency on short cycling. My boiler runs for 1/2 hr Minimum and I will guess total efficiency is not reached for 5-10 minutes. Short cycling takes its toll on components rated for only so many cycles as all are in design. Get a Pro out, get it set right, and understand operation of what you have. A Pro will direct you.. Add up your cycles , per day - year, then you may understand,
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