In a message dated 10/22/2005 11:20:02 AM Central Standard Time,
tr3driver@comcast.net writes:
> >Why would the thermostat have a problem with 10 PSI if the 10 PSI is
> applied
> >to both sides of the thermostat?
>
> Because the original Smiths thermostat was an aneroid type, with a bellows
> full
> of gas that expanded when warm (and opened the thermostat). The cooling
> system
> pressure was not applied to the inside of the bellows, so the gas would have
> to
> get hotter to overcome the cooling system pressure as well as the spring
> pressure.
>
OK
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