[Homeroast] variable transformers

raymanowen at gmail.com raymanowen at gmail.com
Tue Feb 28 19:24:20 CST 2012

KISS- Do Not, rpt, NOT control temperature of a heat process by varying the
power applied to the electric heater. Skipping all the details, just run
the heating device at Full Power- 100%, or whatever you can get with the
available power.

Instead of trying to control temperature by varying the line potential and
heater current, just control the low power drawn by the air mover.(fan
motor)  Low air flow through a heating device or Corvair engine causes the
air stream to get hotter and the engine to cook a couple dozen O-ring oil
seals after the fan belt flips.

SCR, Triac/ diac dimmers are extremely non-linear devices and resistive
heaters respond exponentially to applied potential changes. Kiss
temperature control goodbye.
Persist in old ways; expect new results - suborn Insanity...

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