Importance

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Abstract

Rooms in a building each have a heating, ventilating and air conditioning system (HVAC), a room control unit having a temperature controller, and various sensors. The control unit monitors the presence of persons in the room, determines the season, sets back the temperature in an empty room by a variable amount which the HVAC can restore in a given time, and restores the temperature to the previous user request when the user returns but to a standard temperature if the user has newly checked in. An outside hallway panel briefly displays, when interrogated by a maid, a person's presence. By monitoring maid requests, door status and maid activity, the unit indicates on a room map whether the room is being cleaned, clean, or ready to rent. By establishing the heat loss/gain (l/g) factor of a room with the HVAC off and comparing it with the time to heat or cool the room, HVAC failures are determined. By comparing a room's l/g factor with those of its neighbors, room environment failures are determined. A fire alarm is displayed immediately if more than one unit or more than one sensor reports fire; otherwise a fire alarm display is delayed briefly to reduce false alarms. Fire spreading is displayed on a screen room map showing in red rooms over a certain temperature. For fire, the hallway panels indicate those rooms where a person is present.

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First Claim