Contingency mode operating method for air conditioning system

Details Contingency mode operating method for air conditioning system Contingency mode operating method for air conditioning system

2007-08-15

2010-02-16

Patel, Ramesh B (Department: 2121)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Mechanical control system

C700S277000, C700S278000, C165S200000, C165S201000, C165S237000, C454S229000, C454S237000, C454S238000

Reexamination Certificate

active

07664575

ABSTRACT:
An air conditioning apparatus including a heater or furnace includes a controller for receiving control signals from a thermostat and from a user interface for initiating a contingency mode of operation when a signal from the thermostat is not available. The user interface includes a visual display and multiple keys for entering the contingency mode which includes selecting a capacity of heat output of the apparatus and a duty cycle. The user interface may be disposed in the apparatus cabinet and connected directly to a microprocessor based controller for the apparatus. The contingency mode is automatically aborted if a fault signal is received by the controller, a signal is received from a thermostat or power to the apparatus is interrupted.

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