| 摘要 |
Apparatus for use in a heating system wherein an enclosed region is heated by hot water flowing through a heat exchanger disposed in the region, the hot water being supplied from a boiler heated by a furnace which is electrically actuated and deactuated, the water being circulated between the boiler and the heat exchanger by a circulator pump which is electrically actuated and deactuated, a thermostat being disposed in the space to control the temperature therein and including an electrical switch which is closed when additional heat must be supplied to the region and which is otherwise open. The apparatus employs a first arrangement for actuating said furnace and said pump when said switch is closed and for deactuating the furnace and the pump when the switch is open, a timer which is automatically reset, said timer when electrically actuated operating for a preselected time period and then is automatically deactuated, a second arrangement for actuating said pump and said timer when said first arrangement deactuates said furnace and pump, whereby said pump continues to circulate said water when said switch is open and said furnace is deactuated while said timer remains actuated, and a third arrangement for deactuating said pump when said timer is deactuated and said switch is open.
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