Abstract: Exemplary embodiments are disclosed of controls including circuit assemblies configured for determining igniter, inducer relay, and igniter relay faults. In exemplary embodiments, a control for a system includes an input configured to receive a control signal, an inducer relay, an igniter relay, and a circuit assembly. The circuit assembly is configured to be coupled to the inducer relay, the igniter relay, and an igniter of the system. The circuit assembly comprises a plurality of diodes and is configured to enable detection of and distinguishing between a failure of the igniter, a failure of the inducer relay, and a failure of the igniter relay as determined by a waveform of the control signal at the input of the control for a given one of a plurality of operational states of the control.

Abstract: Exemplary embodiments are disclosed of controls including circuit assemblies configured for determining igniter, inducer relay, and igniter relay faults. In exemplary embodiments, a control for a system includes an input configured to receive a control signal, an inducer relay, an igniter relay, and a circuit assembly. The circuit assembly is configured to be coupled to the inducer relay, the igniter relay, and an igniter of the system. The circuit assembly comprises a plurality of diodes and is configured to enable detection of and distinguishing between a failure of the igniter, a failure of the inducer relay, and a failure of the igniter relay as determined by a waveform of the control signal at the input of the control for a given one of a plurality of operational states of the control.

Abstract: Disclosed are exemplary embodiments of systems and methods for controlling inducer motor speed. In an exemplary embodiment, a method includes changing stator voltage of an inducer motor (e.g., by changing a firing angle of a triac, using a transistor, a silicon controlled rectifier or semiconductor controlled rectifier (SCR), other switching device, etc.); determining actual inducer motor speed (e.g., by using a hall effect sensor or other speed sensor, etc.); and after determining the actual inducer motor speed, changing the motor stator voltage (e.g., by changing the firing angle of the triac, etc.) to a value at which the actual inducer motor speed is controllably regulated and/or maintained substantially at a set speed.

Abstract: Disclosed are exemplary embodiments of systems and methods for controlling inducer motor speed. In an exemplary embodiment, a method includes changing stator voltage of an inducer motor (e.g., by changing a firing angle of a triac, using a transistor, a silicon controlled rectifier or semiconductor controlled rectifier (SCR), other switching device, etc.); determining actual inducer motor speed (e.g., by using a hall effect sensor or other speed sensor, etc.); and after determining the actual inducer motor speed, changing the motor stator voltage (e.g., by changing the firing angle of the triac, etc.) to a value at which the actual inducer motor speed is controllably regulated and/or maintained substantially at a set speed.

Abstract: Exemplary embodiments are disclosed of controls including circuit assemblies configured for determining igniter, inducer relay, and igniter relay faults. In exemplary embodiments, a control for a system includes an input configured to receive a control signal, an inducer relay, an igniter relay, and a circuit assembly. The circuit assembly is configured to be coupled to the inducer relay, the igniter relay, and an igniter of the system. The circuit assembly comprises a plurality of diodes and is configured to enable detection of and distinguishing between a failure of the igniter, a failure of the inducer relay, and a failure of the igniter relay as determined by a waveform of the control signal at the input of the control for a given one of a plurality of operational states of the control.

Abstract: Disclosed are exemplary embodiments of systems and methods for controlling inducer motor speed. In an exemplary embodiment, a method includes changing stator voltage of an inducer motor (e.g., by changing a firing angle of a triac, using a transistor, a silicon controlled rectifier or semiconductor controlled rectifier (SCR), other switching device, etc.); determining actual inducer motor speed (e.g., by using a hall effect sensor or other speed sensor, etc.); and after determining the actual inducer motor speed, changing the motor stator voltage (e.g., by changing the firing angle of the triac, etc.) to a value at which the actual inducer motor speed is controllably regulated and/or maintained substantially at a set speed.

Abstract: Exemplary embodiments are provided of igniter failure detection assemblies for furnaces. In an exemplary embodiment, an igniter failure detection assembly includes a hot surface igniter, an igniter relay coupled to the hot surface igniter, a resistor coupled in parallel with the hot surface igniter and defining a node between the igniter relay, the resistor and hot surface igniter, and a controller configured to detect a voltage at the node and determine whether a fault condition of the hot surface igniter exists based on the detected voltage at the node. A detected node voltage corresponding to a normal operation resistance value of the hot surface igniter is indicative of a normal operating hot surface igniter, and a detected node voltage corresponding to a resistance value of the resistor is indicative of a fault condition of the hot surface igniter. Example methods of detecting an igniter fault condition are also disclosed.

Abstract: A controller for use in a climate control system includes a power stealing circuit connectible with a control of the climate control system and configured for stealing power via a signal from a power source through the control. An overcurrent limiting circuit is configured to limit a first portion of the signal to prevent a false call for operation of the control. The overcurrent limiting circuit is further configured not to limit a second portion of the signal to prevent a false call, where the control is configured to recognize only the first portion as determinative of whether the signal is a call for operation.

Abstract: A controller for use in a climate control system includes a power stealing circuit connectible with a control of the climate control system and configured for stealing power via a signal from a power source through the control. An overcurrent limiting circuit is configured to limit a first portion of the signal to prevent a false call for operation of the control. The overcurrent limiting circuit is further configured not to limit a second portion of the signal to prevent a false call, where the control is configured to recognize only the first portion as determinative of whether the signal is a call for operation.