Apparatus and methods for variable furnace control

Details Apparatus and methods for variable furnace control Apparatus and methods for variable furnace control

2006-06-14

2010-06-15

Norman, Marc E (Department: 3744)

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

C236S0150BD, C236S01500E, C431S019000

Reexamination Certificate

active

07735743

ABSTRACT:
A furnace control system for controlling a gas-fired induced-draft furnace having a variable speed inducer blower. A control apparatus, responsive to a signal corresponding to the magnitude of a pressure difference between an inlet and outlet of the combustion chamber, controls blower motor speed to maintain the pressure difference at a predetermined magnitude corresponding to a selected gas flow rate. Inducer blower motor speed is varied directly and precisely to maintain an optimal pressure drop across the combustion chamber. The control system can be used in multi-stage and modulating furnace systems and in furnace systems utilizing pressure- assist modulating gas values.

REFERENCES:
patent: 4340355 (1982-07-01), Nelson et al.
patent: 5806440 (1998-09-01), Rowlette et al.
patent: 5819721 (1998-10-01), Carr et al.
patent: 6257870 (2001-07-01), Hugghins et al.
patent: 6866202 (2005-03-01), Sigafus et al.

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