A condensate drain system for a heating, ventilation, and/or air conditioning (HVAC) system includes a heat exchanger having a plurality of tubes configured to receive ambient air and fluidly coupled to a drain via a conduit, a valve positioned along the conduit between the plurality of tubes and the drain, where the valve is configured to enable a flow of condensate from within the plurality of tubes toward the drain in an open position and the block the flow in a closed position, and a controller configured to adjust a position of the valve based on feedback indicative of an operational state of the HVAC system.

A combustion heater generates heat by means of flame. The combustion heater is disposed adjacent to a refrigerant circuit filled with a combustible refrigerant. The combustion heater includes a combustion unit and a porous body. The combustion unit causes generation of flame. The porous body covers the combustion unit or a periphery of the combustion unit. The porous body at least partially covers both or one of a combustion space receiving combustible refrigerant leaking from the refrigerant circuit and a member in contact with the combustible refrigerant leaking from the refrigerant circuit. The porous body has a plurality of holes. The holes have a diameter d1 equal to or less than an extinction diameter d of the combustible refrigerant.

A controller for use in a gas appliance system includes a circuit board, a plurality of connectors and a processor mounted on the circuit board. The processor controls operation of the gas appliance using, in part, at least one connector of the plurality of connectors and control settings for an intermittent pilot (IP) system in response to a user selection to configure the controller to control an IP system, and controls operation of the gas appliance using, in part, at least one connector of the plurality of connectors and control settings for a direct spark ignition (DSI) system in response to a user selection to configure the controller to control a DSI system.

A controller for use in a gas appliance system includes a circuit board, a plurality of connectors and a processor mounted on the circuit board. The processor controls operation of the gas appliance using, in part, at least one connector of the plurality of connectors and control settings for an intermittent pilot (IP) system in response to a user selection to configure the controller to control an IP system, and controls operation of the gas appliance using, in part, at least one connector of the plurality of connectors and control settings for a direct spark ignition (DSI) system in response to a user selection to configure the controller to control a DSI system.

An air handler configured with a plurality of air distribution modules, each including a fan, and at least one damper disposed within to provide and direct conditioned air or fresh air to respective multiple zones of a building.

One aspect of this disclosure provides a heating chamber for a gas furnace that comprises opposing halves joined together. The joined opposing halves form a clamshell panel having at least one truncated corner located adjacent a curve located at a back end of a chamber path of the one or more clamshell heating chambers.

One aspect of this disclosure provides a heating chamber for a gas furnace that comprises opposing halves joined together. The joined opposing halves form a clamshell panel having at least one truncated corner located adjacent a curve located at a back end of a chamber path of the one or more clamshell heating chambers.

A furnace inducer choke and a gas furnace employing the furnace inducer choke. In one embodiment, the furnace inducer choke includes: (1) a choke body configured to engage a furnace inducer blower, the choke body having an opening extending entirely therethrough to limit an amount of combustion air entering a furnace that the furnace inducer blower is attached, and (2) a tab protruding from the choke body a distance sufficient to identify the opening when the choke body and furnace inducer blower are installed in the furnace.

A furnace inducer choke and a gas furnace employing the furnace inducer choke. In one embodiment, the furnace inducer choke includes: (1) a choke body configured to engage a furnace inducer blower, the choke body having an opening extending entirely therethrough to limit an amount of combustion air entering a furnace that the furnace inducer blower is attached, and (2) a tab protruding from the choke body a distance sufficient to identify the opening when the choke body and furnace inducer blower are installed in the furnace.

A furnace for a heating, ventilation, and air conditioning (HVAC) system, comprises a burner configured to ignite a mixture of air and fuel and a sensor configured to detect a parameter indicative of an intensity of sound generated by the furnace and configured to transmit a signal indicative of a value of the parameter. The furnace further comprises a controller configured to receive the signal indicative of the value of the parameter, compare the value of the parameter to a threshold value, and in response to a determination that the value of the parameter meets or exceeds the threshold value, control operation of the furnace to adjust a flow rate of the air, a flow rate of the fuel, or both.