Ranco Inc.

Russell G Attridge, Jr

Merlin E Demaray

Andrew Kulick

An air conditioning system controlled for automatically heating and/or cooling a multiple zone building is disclosed wherein each zone includes a zone temperature responsive load transmitter. Each load transmitter produces an output command signal for controlling operation of damper units and heating and cooling equipment. The command signal configuration is modified to avoid operation of heating and cooling equipment throughout a relatively wide 'no load' band of zone temperatures centered around the zone set point temperature. The command signal is highly responsive to sensed zone temperature changes beyond the no load band so that the zone temperature tends to be maintained in the no load band. An alternative system is disclosed in which no load bands occur at two distinct command signal values and operation of damper units is effected when the command signal value shifts between the no load band values.

Method and apparatus for controlling air-conditioning systems

A multiple zone forced air type air conditioning system is disclosed in which the amount of atmospheric air admitted to the system is governed according to sensed temperature conditions of air being circulated through the warmest zone. An atmospheric air sensing control unit responds to atmospheric air temperature and moisture levels to minimize introduction of atmospheric air to the system, notwithstanding the temperature of air being circulated through the warmest zone, when atmospheric air temperature is within a predetermined temperature range but contains more than a predetermined amount of moisture, and when atmospheric air temperatures are higher than the temperature range. The control unit enables atmospheric air to be introduced into the system according to the air temperature being circulated through the warmest zone when the atmospheric air is within the temperature range and contains less than the predetermined moisture content as well as when the air temperature is below the temperature range regardless of moisture content.

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Columbus, OH, United States of America

Russell G Attridge, Jr