Heating systems – Automatic control – Water
Patent
1982-03-10
1989-07-04
Bennett, Henry A.
Heating systems
Automatic control
Water
236 46R, 236 91F, F24D 300
Patent
active
048443352
ABSTRACT:
A control system for a hydronic heating system for an enclosed structure which includes a boiler and at least one heating zone controlled by a thermostat and having a circulator or zone valve for controlling delivery of heat from the boiler to the heating zone(s). The control system senses the ambient temperature external to the enclosed structure, and also the water temperature of the boiler. Responsive to those two sensed values, it determines an upper temperature for the boiler at which the boiler is shut off. The control system further periodically redetermines the upper temperature for the boiler in accordance with the heating demands of the enclosed structure, and accordingly is heuristic in nature. In the preferred embodiment, a central processing unit forms the heart of the control system, and digitally stores in memory words representative of the sensed temperatures and other pertinent parameters relating to timing. The central processor is programmed to perform the function of periodically redetermining the upper temperature for the boiler in accordance with the immediate past heating demands of the heated structure, and also controls the circulators, in first and second heat dumping modes, to dump heat from the boiler after a thermostat is satisfied.
REFERENCES:
patent: 4192455 (1980-03-01), Rasmussen et al.
patent: 4205381 (1980-05-01), Games et al.
patent: 4290551 (1981-09-01), Johnstone
patent: 4381075 (1983-04-01), Gargill et al.
American Stablis, Enertrol Operating Instructions, Jan. 1979.
Castelli Charles C.
McKinley Milton A.
Bennett Henry A.
Surgeonics Limited
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