Does anyone know what the hysteresis is on a Honeywell CM927

I'm looking at installing a Honeywell CM927, or maybe the wired version. I can't seem to find out what the hysteresis is on this unit. Can anyone help?

 

Honeywell's spec says:

Temperature control accuracy: ±0.5 K (nominal) @ 20°C, 50% load 3KΔ/hour.

 

That spec may not exactly equate to the question.

Most modern controls allow the hysteresis to be set at +- 0.5 or +- 1.0

For most applications its not very critical.

Tony

 

Thanks

 

Agreed. But are we talking about hysteresis, in the true sense of the word, or just the spread between on and off.

 

You, I and the Nerd may all be talking about different things!

Many of the latest stats also look at rate of temp rise and not just actual temps.

Its a common falacy that a small differential in a stat gives better control.

In reality there are many other factors that come into play like convection currents from heat sources, draughts etc.

Tony

 

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