Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1993-02-12
1996-01-30
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219497, 219494, 392360, 307 41, 165 29, 165 14, H05B 102
Patent
active
054882184
ABSTRACT:
Activation and deactivation of a plurality of heating elements in an electric heating system are separately controllable in accordance with the present invention. Individual heating elements are sequentially activated in response to a demand for heat. A predetermined time delay is imposed between successive activations of the heating elements to allow time to satisfy the demand for heat before another heating element is activated. Normally, the heating elements are also deactivated sequentially in response to a reduced demand for heat, with a predetermined time delay between successive deactivations to allow time to respond to the reduced demand for heat before another heating element is deactivated. A temperature sensor is located in the air discharge plenum of the heating system for sensing the temperature of the discharge air. The discharge air temperature is used to control the operation of the heating elements, a two-speed heat pump, and the "off cycle" of the heating system blower.
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Olsen Mark W.
Powell Joe R.
Tharp Russell C.
Walter Stephen A.
Lennox Industries Inc.
McCord W. Kirk
Paschall Mark H.
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