| 摘要 |
Energy saving apparatus for selectively controlling the heating and/or cooling equipment in rooms of hotels, motels or the like permits automatic, thermostatically regulated deactivation of such equipment when the room is unoccupied and the temperature in the room is within a preselected range, automatic reactivation of such equipment when such temperature falls below or rises above such range, and controlled reactivation of such equipment when the room ready for occupancy. The apparatus advantageously utilizes portions of a typically pre-existing, conventional telephone installation, and particularly the tip and ring lines between a central station and a telephone in each room, for carrying all electrical power and signals required for effecting such temperature control. The polarity of energization of such lines for temperature controlling operation is reversed from that employed for normal telephone operation, and the temperature controlling parts of the apparatus are non-responsive to power of the polarity applied to such lines during normal telephone operation. The apparatus permits selection of either temperature controlling operation, normal telephone operation or message alert signaling operation by simple manipulations of a single electrical switch component for each room by an operator at the central station.
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