Control system for electric water heater with heat

专利名称：Control system for electric water heater

with heat pump external heat source

发明人：Jacob E. Shaffer, Jr.,Joseph F. Picarello申请号：US06/570338申请日：19840113公开号：US040874A公开日：19850910

摘要：A control system for an electric water heater operatively associated with anexternal heat source, such as a heat pump. The water heater includes a water storagetank provided with an electric tank heating unit having a tank thermostat which closes inresponse to water temperature in the tank, allowing a flow of current through the tankheating unit so as to turn it on to heat the water, and which opens when the tankthermostat has been satisfied, interrupting the current flow so as to turn the tankheating unit off. The control system as responsive to the initial current surge through thetank heating unit when the tank thermostat closes to (1) interrupt the current flow to thetank heating unit so as to maintain the heating unit off and (2) to turn on the externalheat source and maintain it on until the tank thermostat opens. The initial current surgecleans the contacts of the tank thermostat by burning off any insulating oxide residueswhich may have formed on them. The control system includes means responsive toabnormal conditions which would prevent the external heat source from heating watereffectively for (1) turning off the external heat source and turning on the tank heatingunit and (2) maintaining the external heat source off and the tank heating unit on until thetank thermostat is satisfied.

申请人：BORG-WARNER CORPORATION

代理人：Julian Schachner

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