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I think the t-stat is remote. I don't quite understand why another wire is needed. My understanding of a snap disk is the method it uses to make and break but how does that differ from a standard t-stat.

Why not use a regular T-stat --DP type
Because a 220v t-stat shuts off both legs which shuts down the 220v motor and doesn't cool down the element.
You’re saying the fan continues to operate momentarily after the thermostat shuts the heater down? Maybe that’s the reason for the third wire; it provides power to the fan after the two 240V legs are opened (that would mean there’s a neutral at the heater).
No neutral at the heater. The 3rd wire only sends current to 1 side of the 220v motor.
 

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On the 220v heather when the t-stat is satisfied it shutdown the elements and the 220v fan but the unit is still hot at about 110 to 220 degrees with nothing to cool down the elements. That's why I wired it the way I did. Using the snap disk t-stat to control the fan.
 
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