Title: Multi-stage electric heater apparatus and method of control

Abstract: An electric heater control circuit is shown which utilizes a 10-step controller for obtaining eighteen steps of heating control. Electrical and magnetic control circuitry operates this 10-step controller effectively through two cycles, one at a low level power output mode and a second at a high level power output mode, to thereby substantially increase the effective number of steps of heat control. In addition, means are provided for instantaneously energizing or de-energizing a plurality of small electric heaters upon shifting modes to compensate for the de-energization or energization respectively of a large heater to thereby avoid momentary periods of excess heat or cold while the controller is shifting modes.

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Inventors: Schlangen, Andrew J. (La Crosse, WI, US)

Application Number: 517075
Filing Date: 1974-10-23
Publication_date: 1976-01-13
Assignee: The Trane Company (La Crosse, WI)
Primary Class(es): 219/486 219/483
Other Classes:
US Patent Ref:

2848588	Aug, 1958	Hackman	219/486.
3052788	Sep, 1962	Peters	219/480.
3161758	Dec, 1964	Biermann et al.	219/480.
3579264	May, 1971	Mork et al.	219/486.

Other Refs:
Primary Examiner: Envall, Jr., R. N.
Assistant Examiner: Bell, Fred E.
Attorney: