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Posted to alt.home.repair,sci.electronics.repair
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Hysteresis on the Honeywell old-style bulb thermostat
Tony Hwang wrote:
Dave M wrote:
It's the weight of the mercury that moves the bimetal coil spring such that
it takes a higher temperature to bend the bimetal coil spring so that the
mercury flows back to the other end of the bulb. When the mercury moves to
one end of the bulb, it makes the spring reposition itself so that it takes
a much higher (or lower, depending on heat or cool mode) for the spring to
return back to its original position.
Here's a link to a web page that describes the operation very well, saving
me a lot of typing.
http://inspectapedia.com/heat/Thermo...e_Response.php
Cheers,
Dave M
I think you are thinking backward. Spring controls the position of bulb
depending on temperature. Not the other way around.
They are interactive.
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