Carrier Corporation

Jerry Dean Ryan

Rajendra K Shah

Eugene L Mills, Jr

Michael A Roher

William F Van Ostrand

Tim Comerford

Shannie Van Ostrand, Legal Representative

An HVAC system is provided with control communication over a serial data bus. In this manner, the hard wired controls of the prior art are eliminated. A thermostat includes a central control microprocessor that communicates control signals to and from a microprocessor at an indoor unit. The indoor unit may be a furnace or a fan/heater combination. The microprocessor on the indoor unit is operable to receive signals from the central control microprocessor and control the indoor unit accordingly. Moreover, the microprocessor at the indoor unit is operable to pass control signals on to an outdoor unit such as an air conditioner or heat pump. Most preferably, this outdoor unit is provided with its own microprocessor. Further, other peripheral units may be incorporated to be controlled over the same data bus from the thermostat. Installation and updating of HVAC systems is greatly simplified by this control arrangement.

Serial communicating HVAC system

The invention relates to a thermostat including a user interface module. The user interface module has a display, a plurality of user interface buttons, and a first power and communications interface. The thermostat also includes an I/O module, the I/O module electrically coupled to a HVAC plant and the I/O module having a plurality of switches to control the HVAC plant, and a second power and communications interface. The user interface module and the I/O module are communicatively coupled and exchange power via the power and communications interfaces and the thermostat can be mounted and operated in one of two user selectable installations: a stacked configuration comprising a thermostat having the user interface module directly mounted to the I/O module, or a remote configuration comprising a thermostat having the user interface module remotely mounted from the I/O module.

Stackable thermostat

An electric heater is provided with an identifying resistor associated with a connection between the heater and a fan control. When the electric heater is connected to the control, the identifying resistor provides information with regard to the capacity of the particular electric heater that is being attached to the control. The control then utilizes this particular capacity to control both the electric heater and an associated fan motor.

Identification of electric heater capacity

A system for self-configuring complex HVAC systems has each of several units provided with a microprocessor control. The several units are each available in various optional styles, sizes, etc. The microprocessors provide information to a central control of the particular characteristic of the particular unit. Thus, when the HVAC system is initially assembled, the microprocessors associated with the individual units report these characteristics to the control. The control then determines the characteristics of each of the individual units, and accesses control strategies for the combination of individual units that are being utilized in the particular HVAC system.

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Indianapolis, IN, United States of America

Jerry Dean Ryan