Control system

Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff

Patent

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Details

165 16, 307 39, 364418, F24F 1100

Patent

active

041148070

ABSTRACT:
This system is of the power management type and is for controlling the operation of the various stages within a number of units such as heating, ventilation, and air conditioning units commonly referred to as HVAC units which may be of conventional design and for use in commercial buildings.
The system permits only a limited number of stages, fewer than the total number contained in all the HVAC units to be predeterminedly operated at one time but preferably stores an indication of all stages which are demanding operation of the total number of HVAC units in the building. If a greater number of stages are demanding than the system has been pre-set to operate then an indication of the unsatisfied or inhibited unit or units is stored. If this condition persists for a predetermined period of time such as 5 minutes then the longest running stage, even though it is sill demanding, is dropped or stopped and the longest waiting inhibited stage is satisfied or started. A further aspect of the system is to provide a counter that keeps a cumulative count of the occupants in the building at any one time. This count in turn controls operation of the action of the ventilating fans as well as the damper operations to reduce the total volume of outside air introduced to the building when the count decreases or is at a minimum and to increase the total volume of outside air by opening the dampers and starting ventilating fans as required when the count increases. The system can be predeterminedly set for a minimum pre-established amount of ventilation air introduced to the building as well as correlating the numbers of people as to when it introduces additional air to the building.

REFERENCES:
patent: 2733426 (1956-01-01), Jablonowski
patent: 2975411 (1961-03-01), Hanson
patent: 3011718 (1961-12-01), Joerren et al.
patent: 3110010 (1963-11-01), Smith
patent: 3115622 (1963-12-01), Jaffe
patent: 3489913 (1970-01-01), Wildi
patent: 3797560 (1974-03-01), Zaharoni
patent: 3875955 (1975-04-01), Gallatin et al.
patent: 3987308 (1976-10-01), Burch
patent: 4000400 (1976-12-01), Elder
Control Systems for Heating Ventilating & Air Conditioning, Haines, 1971, p. 108.

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