Control for a heating ventilating and air conditioning unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 10, 2002
Grant Date -
Aug 2, 2001
app pub date -
Feb 6, 2001
filing date -
May 4, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for a heating, ventilating, and air conditioning unit having a heating stage, a cooling stage, and an economizer is provided. The system includes a memory configured to store a first predetermined temperature range and a second predetermined temperature range. The system also includes a control having an input device configured to receive an indoor air temperature representative of the air in one or more zones and a supply air temperature representative of the air entering the one or more zones. The control selectively activates at least one of the heating stage, the cooling stage, and the economizer when the indoor air temperature is outside of the first predetermined temperature range. The control also selectively activates at least one of the heating stage, the cooling stage, and the economizer when the indoor air temperature is within the first predetermined temperature range and the sensed temperature of the supply air is outside of the second predetermined temperature range.
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