Peak-load conserving thermostat and method

G - Physics – 05 – D

Patent

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G05D 23/19 (2006.01)

Patent

CA 2214782

A method and control apparatus (14) are described for limiting peak-load contribution by HVAC systems (24) and other systems. The control apparatus (14) reduces the percentage of on-time and thus fuel and power consumption and demand for utility capacity to a predetermined extent during peak-load periods, by inhibiting fuel-on signals from the thermostat (12) of each HVAC system to the furnace, fuel-pump, or air conditioner of the HVAC system (24), or other system, so that the total on-time during a load-measuring interval is reduced to a predetermined amount. During non-peak periods, the control apparatus (14) is inactive and the thermostat (12) controls the HVAC system (24). The invention can be used to retrofit an already installed thermostat, incorporated into a new thermostat installation, or incorporated into a thermostat as it is manufactured.

Procédé et appareil de commande (14) destinés à limiter la contribution aux charges maximales de systèmes (24) de chauffage, ventilation et climatisation (CVC) et d'autres systèmes. L'appareil de commande (14) réduit le pourcentage de temps de marche et par conséquent la consommation de combustible et d'énergie, ainsi que la demande de capacité de la part du service publique dans une mesure prédéterminée pendant les périodes de charges maximales, par neutralisation des signaux de consommation de combustible allant du thermostat (12) de chaque système CVC à la chaudière, à la pompe à combustible ou au conditionneur d'air du système CVC (24), ou d'un autre système, de manière que le temps de marche total pendant un intervalle de mesure de charge soit réduit à une quantité prédéterminée. En dehors des périodes de charges maximales, l'appareil de commande (14) est inactif et le thermostat (12) gère le système CVC (24). L'invention peut être utilisée pour rattraper un thermostat déjà installé incorporé dans une nouvelle installation de thermostat, ou incorporé dans un thermostat lors de sa production.

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