Furnace turns on every 10 minutes

[JEDI]

Based on this info from Boomer and the OP saying it is a 20 year old furnace the OP should set
the Heating Cycle Rate as listed below


Function 5
5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.

wait.. u said 80% above?! now 90%?

wtf?

 

[Triumph]

Based on this info from Boomer and the OP saying it is a 20 year old furnace the OP should set
the Heating Cycle Rate as listed below


Function 5
5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.

Yes I said that early in the thread, that's what it was set at when it was turning on every 10 minutes. I changed it to setting 3 for "high efficiency" furnace. Which I seriously doubt that I have. But it seems to have fixed the problem, it took over 25 minutes between cycles this time, and the indoor temperature reading has not dropped yet.

I still think it's a shitty thermostat for not making this more clear in the instructions.

 

[millermin]

Yes I said that early in the thread, that's what it was set at when it was turning on every 10 minutes. I changed it to setting 3 for "high efficiency" furnace. Which I seriously doubt that I have. But it seems to have fixed the problem, it took over 25 minutes between cycles this time, and the indoor temperature reading has not dropped yet.

I still think it's a shitty thermostat for not making this more clear in the instructions.

I got same problem this season,and i did the same job as you after read this, and fixed the same problem, thanks a lot.

 

[gorcorps]

despite the necro, this is still valid:

I've got to dig it up again, but I remember reading a study on the difference between letting your heat (or AC) run all day vs. right when you come home. Their conclusion was it was better to save energy during the day, and run it longer right when you get home after some real world tests.

The theory behind why IIRC is because your house is obviously not perfectly insulated, so it's going to be losing heat during the day. Heat transfer is greater when your delta T is greater (difference in temperature), so the bigger the difference between the outside temperature and the temperature you're heating your house to, the larger your heat transfer rate. So by keeping your house warmer for longer, you're wasting more heat via natural heat transfer than you would if you kept it cooler when you aren't there.

 

[Red Squirrel]

despite the necro, this is still valid:

I've got to dig it up again, but I remember reading a study on the difference between letting your heat (or AC) run all day vs. right when you come home. Their conclusion was it was better to save energy during the day, and run it longer right when you get home after some real world tests.

The theory behind why IIRC is because your house is obviously not perfectly insulated, so it's going to be losing heat during the day. Heat transfer is greater when your delta T is greater (difference in temperature), so the bigger the difference between the outside temperature and the temperature you're heating your house to, the larger your heat transfer rate. So by keeping your house warmer for longer, you're wasting more heat via natural heat transfer than you would if you kept it cooler when you aren't there.

That's pretty much what my theory has always been, nice to know that it's actually backed up by some studies. I never really tested it myself.

I let the heat drop to like 12c at night or when I'm not home. When it does kick in it runs till it hits about 15c then lets it drop to 12 again. I set a long range like that mostly so that the heat runs long enough that it should get to areas that are colder than 12. In -50 situations I don't want pipes to freeze.

What sucks though is when I need to get up to go pee in the middle of night.

 

[JEDI]

Yes I said that early in the thread, that's what it was set at when it was turning on every 10 minutes. I changed it to setting 3 for "high efficiency" furnace. Which I seriously doubt that I have. But it seems to have fixed the problem, it took over 25 minutes between cycles this time, and the indoor temperature reading has not dropped yet.

I still think it's a shitty thermostat for not making this more clear in the instructions.

ok, how do I set my furnace from a 5 to a 3?

 

[gorcorps]

Yes I said that early in the thread, that's what it was set at when it was turning on every 10 minutes. I changed it to setting 3 for "high efficiency" furnace. Which I seriously doubt that I have. But it seems to have fixed the problem, it took over 25 minutes between cycles this time, and the indoor temperature reading has not dropped yet.

I still think it's a shitty thermostat for not making this more clear in the instructions.

They must not have paid their technical writer enough

 

[natto fire]

why 3?

changing from 5 to 3 will increase sensitivity, thus more cycles?

Yeah, I was going to suggest going the other way, setting it to 9, although it might end up making the temperature swing too much to be comfortable.

 

[Carson Dyle]

If you can't figure out which is which, try one extreme, then the other. Shouldn't take someone of average intelligence very long to figure it out.

("Hey, if I can't find the knowledge on the Internet, I'm f***ed.")