초록 ▼

A method and system for controlling the temperature of air returned to a conditioning unit in a zoned system is disclosed. The system includes a heating, ventilating, and air conditioning (HVAC) unit that has an economizer. The HVAC unit is connected to a plurality of zones by a supply duct and a re

A method and system for controlling the temperature of air returned to a conditioning unit in a zoned system is disclosed. The system includes a heating, ventilating, and air conditioning (HVAC) unit that has an economizer. The HVAC unit is connected to a plurality of zones by a supply duct and a return duct. A temperature sensor is provided to sense the temperature of air returning to the HVAC unit. A main control increases the amount of outdoor air entering the system through the economizer when the temperature of the returned air is excessively warm or excessively cold.

대표청구항 ▼

[ What is claimed is:] [1.]1. A system for conditioning air in a plurality of zones, comprising:a heating, ventilating, and air conditioning unit having an economizer operable to allow variable amounts of outdoor air into the unit, the unit operable to provide conditioned air to one or more zones;a

[ What is claimed is:] [1.]1. A system for conditioning air in a plurality of zones, comprising:a heating, ventilating, and air conditioning unit having an economizer operable to allow variable amounts of outdoor air into the unit, the unit operable to provide conditioned air to one or more zones;a supply air duct connecting said unit to said one or more zones;a damper associated with each of said one or more zones, the damper operable to control the amount of conditioned air entering each of said one or more zones;a return air duct connecting each of said one or more zones to said unit and returning air to said unit;a bypass duct connecting the supply duct to the return duct;a first temperature sensor for sensing a first temperature representative of the air returned to said unit;a second temperature sensor for sensing a second temperature representative of the outdoor air; anda main control, coupled with said temperature sensors, operable to modulate the economizer to increase the amount of outdoor air entering said unit when the first temperature falls below a cooling setpoint, the second temperature is greater than the first temperature, and the unit is operating in a cooling mode, the control further operable to modulate the economizer to increase the amount of outdoor air entering said unit when the first temperature rises above a heating setpoint, the second temperature is less than the first temperature, and the unit is operating in a heating mode. [6.]6. A control system a heating, ventilating and air conditioning unit in a system having a plurality of zones, each of the plurality of zones connected to said unit by a supply duct and a return duct, the system comprising:an economizer;a first temperature sensor for sensing a first temperature representative of the air returned to said unit;a second temperature sensor for sensing a second temperature representative of the outdoor air; anda control device operable to modulate the economizer to increase the amount of outdoor air entering said unit when the first temperature falls below a cooling setpoint, the second temperature is greater than the first temperature, and the unit is operating in a cooling mode, the control further operable to modulate the economizer to increase the amount of outdoor air entering said unit when the first temperature rises above a heating setpoint, the second temperature is less than the first temperature, and the unit is operating in a heating mode.