Furnace anticipator

[Rmack1]

I had the control board on my furnace replaced, which fixed it, but before that I tried a new thermostat.

The new one, like the old, had an adjustable anticipator. This is a little dial on the inside of the thermostat that adjusts the amps, or something. The manual said to set the thermostat anticiptor to .7 amps, which I did.

The thing is; my furnace now goes on and off several times sometimes before settling down and running. I tried adjusting the anticipator .05 amps at a time, like the manual says, to .8 and .6, but all settings seem to produce a stutter before the furnace decides to stay on.

Should I just try further settings on the anticipator?

[wa8yxm]

Most anticipators are pre-set for a 24 volt system.. Yours is a 12 volt system

Thus adjustment is needed.. I contacted the T-Stat maker.. They said "Do not set all the way".. but that is what I had to do.. I forget (And am not in the RV just now) Which way it went.

[dougrainer]

A Furnace Anticipator is just a simple way to TURN THE BURNER OFF before the RV reaches the set temp. You have the RV (or your house) set at 70 degrees and the furnace burner is heating up. The anticipator just shuts the burner OFF at say 68 or 69 degrees, because the Heat Chamber is hot and will continue to heat until it reaches the set of 70 and then you have the cool down cycle. BTW, some electronic Tstat control systems CAN and do have an anticipator adjustment. Doug

[red31]

Rmack1 wrote:
I just set the anticipator to .8 and it seems to be running fine now.

Get it set to you liking so you don't have temp swings.
It heats up the stat so it shuts off 'early' to prevent overheating temp swings.

[SoundGuy]

Rmack1 wrote:
Should I just try further settings on the anticipator?

I'd have replaced the bi-metal thermostat with a digital thermostat and eliminate any concerns over anticipator values.

[enblethen]

And the thermostat?
I like Dinosaur electronics circuit boards. Less expensive then most OEM.

[Rmack1]

enblethen wrote:
Normal setting is .8
Furnace should run about 6 times per hour. Increasing the number reduces the runs.
Make and model of furnace?
Make and model of thermostat? Is it set for gas operation?

It's a Suburban. With a cheap Chinese control board. At least it used to have a cheap board.

[Rmack1]

Get this;

I just set the anticipator to .8 and it seems to be running fine now.

I think I was being too conservative, and didn't fully set it to .8, and .79 didn't cut it.

Forehead slap.

[ScottG]

If it's a Energy Star rated stat, that's pretty much what they do.

[enblethen]

Normal setting is .8
Furnace should run about 6 times per hour. Increasing the number reduces the runs.
Make and model of furnace?
Make and model of thermostat? Is it set for gas operation?

[Rmack1]

btw, the anticipator settings are suppose to lengthen the time the funace cycles between on and off if you increase it, and shorten the time if you dial it down.