HVAC twinning control

Details HVAC twinning control HVAC twinning control

2005-09-27

2008-05-27

Tyler, Cheryl J. (Department: 3744)

Refrigeration

Automatic control

Diverse, cascade or compound refrigeration-producing system

Reexamination Certificate

active

07377120

ABSTRACT:
A control is provided for a first HVAC unit that is coupled to a common duct shared with at least one other HVAC unit. The control comprises a twinning connection for communication with at least a second control of another HVAC unit, and a voltage signal applied to the twinning connection. The control further comprises a switching means for switching the voltage signal to ground. A microcomputer for monitoring the twinning connection and for controlling the switching means is configured to actuate the switching means to switch the voltage at the twinning connection to ground for a predetermined time period to communicate a blower speed for the first HVAC unit. The microcomputer monitors the twinning connection to sense the duration that the voltage at the twinning connection is being conducted to ground, and responsively controls the speed of the first HVAC blower according to the prescribed blower speed corresponding to the sensed duration.

REFERENCES:
patent: 5316073 (1994-05-01), Klaus et al.
patent: 5727928 (1998-03-01), Brown

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