HVAC staging control

Details HVAC staging control HVAC staging control

2007-04-13

2010-10-26

Tyler, Cheryl J (Department: 3744)

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

C062S157000, C062S158000, C236S04600F, C165S205000, C165S212000

Reexamination Certificate

active

07819331

ABSTRACT:
A controller for an HVAC system having a plurality of zones and having a multiple stage fluid temperature conditioning device. The controller is configured to receive a plurality of thermostat signals and to transmit a signal to control one of a plurality of flow control devices in response to a call for conditioning in one of the plurality of zones. The controller also includes one or more timers that are connected to the thermostat terminals, where the one or more timers are configured to initiate a separate timing count upon each call for conditioning in any one of the plurality of zones. In addition, the controller includes one or more staging terminals for transmitting staging signals to control a multiple stage fluid temperature conditioning device, where the transmission of the staging signals determines whether the conditioning device will operate at a relatively higher output stage. The controller is also configured to make a timing count determination to determine if any one of the separate timing counts initiated upon each call for conditioning in any one of the plurality of zones exceeds a timing delay parameter. The transmission of staging signals depends on the timing count determination. A method is also disclosed.

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