Abstract: A burner control for a condensing furnace having a flame proving circuit that incorporates the flame at the burner to be closed and that opens upon absence of a flame to cause a gas valve to close and block the flow of gas to the burner. A short circuit shunting the flame proving circuit includes a probe that projects into the outlet manifold of the condensing furnace. If liquid level in the outlet manifold reaches the probe, a short circuit is closed between the probe and a ground on the manifold. The control to the valve is energized to close the valve in the same manner as if the flame had extinguished at the burner. Upon closing the gas valve, the burner is extinguished.

Abstract: An evaporator pan assembly comprises an inner pan having walls defining a pan capable of containing water. An outer pan has walls surrounding at least most of the walls of the inner pan, and there is an air space between the inner pan and outer pan walls. One end wall of the inner pan is movable relative to the adjacent outer pan end wall.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating substantially elliptical rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange and the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. The expander includes radially and axially moveable jaws comprising plural jaw segments which are engaged by an axially moveable mandrel. The number of jaws in the expander is sufficient to form a substantially leakproof seal between the exchanger unit and the support plate assembly in a single expander operation through a single bending sequence.

Abstract: A condensate drain system for a furnace incorporates a collector and blower housing assembly mounted above a secondary condensing heat exchanger with condensate ports between the blower housing and the collector housing positioned to assure flow of all condensate from the exhaust flue and the blower housing to the collector housing. A pipe extends downwardly from the collector housing to the condenser outlet manifold so that all condensate ultimately flows to the condenser outlet manifold and can be discharged to a drain by a single tube.

Abstract: A sub-base for use in conjunction with thermostats for controlling air conditioned spaces includes a false heat device and a radio frequency receiver and control circuit for turning on and off the false heat device to provide temperature setback control for the thermostat. The sub-base may be mounted between the thermostat and the existing wall mounting structure and is adapted to be connected to the thermostat control conductors for a source of power for the sub-base and to receive radio frequency signals transmitted over the thermostat conductors.

Abstract: A plate assembly is secured to a heat exchanger unit for a hot air furnace at each of one or more apertures in the unit by expanding a flange extending around an aperture on the plate within the aperture in the unit to cause such flange to conform to the exact shape of the aperture in the unit and form a leak-proof joint between the heat exchanger unit and plate assembly.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating oval rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. A second expander apparatus is inserted in the opening after withdrawal of the first expander to engage and expand portions of the flanges which were not fully displaced by the first expander. The expander mechanisms include radially and axially movable jaws comprising plural oval shaped jaw segments which are engaged by an axially movable mandrel.

Abstract: A heat exchanger unit having opposed pan shaped sections with perimeter flanges which are folded one over the other to secure the sections together. The section having the inner flange is formed with a displaced flange portion or bead all along the perimeter flange portions, which bead is elastically displaced by the folded over flange to form a substantially leakproof joint.

Abstract: A mounting curb for rooftop packaged air conditioning units comprising a generally rectangular frame having a bottom wall with adjacent return and supply air duct openings formed therein and in communication with respective common supply and return air ducts formed in the curb. The return air duct includes opposed branch portions leading to openings in the top wall of the curb in communication with the return air openings in the air conditioning units. The supply air duct includes opposed branch portions also in communication with respective supply air openings in the bottom wall of the air conditioning unit enclosures. The supply air duct is disposed generally over the return air duct and inward therefrom with respect to the opposite end walls of the curb.

Abstract: A ground water system for a domestic storage tank and reversible heat pump is arranged to prevent the build up of excessive pressure in the storage tank when the flow of water through the heat pump is restricted to a defined degree by the operation of valve means controlling the water flow as required by the heat pump.

Abstract: A cabinet for air conditioning or heat pump equipment is provided with resilient coil guards which can be flexed into and out of engagement with corner posts and struts that lend rigidity to the guards and are structural integrating members of the cabinet.

Abstract: A heat pump system utilizing water for heat transfer purposes from a well having a continuous supply rate capability which is less than that required by the heat pump of the system is arranged to provide for the continuous return to the well of a portion of pump discharged water as required to stabilize the level of water in the well.

Abstract: The sides of a heat exchanger unit are joined with perimeter flanges which are folded one over the other and then crimped tightly in such fashion as to cause adjacent portions of the perimeter to extend at different angles in different planes resulting in a scissor action therebetween effective to securely clamp the heat exchanger sides together and form a leak-proof chamber.

Abstract: A top cover, motor, fan and fan shroud for an air conditioning unit are assembled into an integrated structure with motor supporting legs which attach to the top cover and cause the shroud to be drawn against the cover. The legs connect with the shroud in a manner serving to preserve the concentricity of the shroud, and attach to the inside of a band which can be tightened to assure containment of the motor in a defined position under the shroud and vented portion of the cover.