A furnace for heating a building has its bottom supported spaced above a support surface by an apparatus which comprises a furnace engagement member defining a generally planar top surface for contacting the bottom of the furnace and an underside which is opposite to the top surface; an attachment arrangement respectively located at or adjacent each end of the furnace engagement member and arranged for facilitating connection thereof to a respective flange of the furnace defining the bottom of the furnace; and a leg oriented transversely to the generally planar top surface and coupled to the underside of the furnace engagement member at a location thereon which is spaced in a longitudinal direction from a respective end of the furnace engagement member further inwardly than the attachment arrangement disposed thereat or adjacent thereto.

A movable fluid fuel heater to heat air and to introduce it into an environment to be heated. The heater includes a flow rate variator device for varying the flow rate of oxidizing air introduced in the combustion chamber by a forced ventilation device between a minimum flow rate value and a maximum flow rate value. The heater also includes a reference device comprising a plurality of reference values of a parameter representative of the pressure and a plurality of reference temperature values of the environmental air upstream of the combustion chamber. The reference device is configured to suggest an optimal setting value to set the flow rate variator device, at each pair of values formed by a value of the plurality of reference values of a parameter representative of the pressure and a value of the plurality of reference temperature values.

A furnace may include a furnace cabinet, an inducer blower, and a flue vent adapter. The furnace is configured as a multi-poise furnace and configured to be installed and operated in each of the horizontal left flow orientation, the horizontal right flow orientation, the upflow orientation, and the downflow orientation. The flue vent adapter is used when the furnace is installed and operated in the downflow orientation. Alternatively, the flue vent adapter is used when the furnace is installed and operated in each of the horizontal left flow orientation and the horizontal right flow orientation. The flue vent adapter has a unitary construction to reduce manufacturing costs, reduce a pressure drop through the flue vent adapter, and reduce leakage.

An apparatus for use with a fan coil cabinet occluded by a releasably secured baffle having intake and discharge vents communicating with the cabinet and containing a coil which water passes and a fan which forces air past the coil for conditioning, wherein the fan has an outlet and a coil. The apparatus comprises a housing with the fan and coil mounted thereto, and a support mounted to the cabinet wherein the housing slides for movement between a retracted position, within the cabinet, and an extended position, protruding from the cabinet. The housing has a port with the fan coupled thereto for sealed communication between the port and the outlet. The coil and the housing define a cavity with which the port communicates. The housing defines an aperture and a door releasably secured in occluding relation to the aperture to provide access to the cavity for maintenance of the coil.

A method of controlling a gas furnace comprising a gas valve for supplying a fuel gas to a manifold; a burner through which the fuel gas discharged from the manifold passes; an igniter for igniting a mixture of fuel gas passed through the burner and air; and an inducer for generating a flow in which a combustion gas generated by the burning of the mixture is discharged to an exhaust pipe via a heat exchanger, wherein the gas furnace performs a heating operation according to a heating signal or a heating stop according to a stop signal, includes the steps of: (a) receiving any one of the heating signal or the stop signal; (b) transmitting a signal to operate the inducer when the heating signal is received; (c) operating the igniter; (d) transmitting a signal to open the gas valve; (e) detecting whether the gas valve is opened or closed; (f) detecting a flow rate of the fuel gas in the manifold; and (g) displaying a normal operation of the heating operation, based on information detected in the steps (e) and (f).

A heat exchanger includes a temperature sensor for a vehicle heating device, a heat input surface, an electrical heating element arranged on the heat input surface, and a heat output surface. The temperature sensor is arranged in a depression on the heat output surface.

A furnace including a combustion chamber for burning fuel can have increased fuel burning efficiency, increased heating efficiency, and decreased harmful emissions of combustion byproducts. A combustion air delivery system delivers primary and secondary combustion air to the combustion chamber. Primary and secondary combustion air may be delivered at amounts that increase burning efficiency. An amount of secondary combustion air can be controlled by a valve system. A heat transfer device efficiently transfers heat from products of combustion for heating an enclosed space.

A furnace system featuring baffles, each set of baffles including one or more movable vanes, and systems for controlling the positioning of movable vanes during furnace operation. Actuators may be used to move vanes between deployed and retracted positions, the actuators controlled by units within the furnace or linked to the power sources for furnace elements which are specific to either heating or cooling operations. The movable vanes may alternately be positioned by using springs with stiffness selected to place vanes in a deployed position when under heating airflows and in a retracted position when under cooling airflows.

Embodiments of the present disclosure are directed to a furnace that includes a blower configured to operate to force a fluid through the furnace, a motor having a rated speed, in which the motor is coupled to and configured to actuate the blower, and a controller configured to receive data indicative of an operating characteristic of the furnace and regulate operation of the motor to be at or below an operational speed limit. The controller is configured to set the operational speed limit based on the data indicative of the operating characteristic of the furnace, such that the operational speed limit is less than or equal to the rated speed of the motor.

A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, wherein, the air inlet portion has at least one angle-reduced portion that satisfies 0>i>0, where, an angle formed by a line L1 and a line L2 is taken as 0, and an angle formed by a straight line L3 and the line L2 is taken as i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.