Abstract: A trench heater includes a case, a connecting unit, and a sub-assembly unit. The sub-assembly unit includes a baffle, a first junction panel, a second junction panel, and an electrical heating unit. The electrical heating unit includes a heating unit that comprises a heating element, a body, and a granular heat transfer medium. Multiple trench heaters may be connected end to end to create longer lengths via a modular platform.

Abstract: An apparatus for lighting a burner of a heat exchanger includes a mounting plate configured to be mounted to the heat exchanger, the mounting plate including a first and second opening, a pilot ignition rod assembly installed in the first opening, the pilot ignition rod assembly including a flame ionization rod and a terminal, and a sleeve coupled to and aligned with the second opening and configured to extend substantially through a refractory material lining a combustion chamber of the heat exchanger, the sleeve being joined to a ground rod on a distal end and a gas orifice mount on a proximal end, the gas orifice mount including a gas venturi surrounded by the sleeve, wherein the sleeve is sized to extend from the mounting plate through an opening in the refractory material lining the combustion chamber, wherein the sleeve includes a sleeve opening adjacent to the gas venturi, the sleeve opening configured to allow air from the combustion chamber to the gas venturi.

Abstract: A lid for a heat generating device in which the heat generating device has a body with a combustion chamber disposed therein. The lid includes an air moving device, an air intake housing, and a hinge. The air moving device is configured to generate a flow of air. The air intake housing is disposed between the lid and the air moving device. The air intake housing extends out from the lid to cantilever the air moving device out from the lid. The hinge is disposed between the lid and the body and proximal to the air intake housing. The hinge is configured to provide a pivot for the lid. A weight of the air moving device counter balances at least a portion of a weight of the lid to ease pivoting of the lid into an open position.

Abstract: A hydronic system having a set of inputs, a plurality of boilers, and a controller. Each input representing sensor for a respective heat emitter of a set of heat emitters. Each boiler of the plurality of boilers is configured to receive signals from a portion of the set of inputs. The controller is configured to a status and assignment of the set of inputs from the plurality of boilers and control the plurality of boilers to provide heat to the set of heat emitters.

Abstract: The present disclosure pertains to a system configured to prepare and use prediction models for classifying images. Some embodiments may: obtain, via a system return temperature sensor, a system return temperature; obtain, via an appliance return temperature sensor, an appliance return temperature; and responsive to a determination that the appliance return temperature is greater than the system return temperature by at least a first threshold amount, decrease, via a hardware processor, a speed of the appliance pump.

Abstract: A spool assembly which provides for field adjustment of the column length in a pumping system such as that used in gasoline dispensing. The spool assembly is installed between a submersible electric pump and a discharge head. The spool assembly includes a head spool, a base spool and a column pipe which connects the head and base spools. The spools have electrical connectors which automatically make electrical connection to supply power to the submersible pump motor. A liquid flow path is provided through the spool assembly and is isolated from the electrical circuitry.

Abstract: A control circuit for a sump pump or other pump that controls the liquid level in a vessel. The liquid is maintained between upper and lower levels defined by probes in the vessel. The probes are associated with comparators and connect with one comparator input. The upper limit comparator connects with the gate of an SCR which supplies current to the lower limit comparator and also to a relay which controls the on/off condition of the pump. The output of the lower limit comparator controls a switching transistor which is arranged in a series circuit with the SCR and relay coil. Once the SCR is conductive, it is latched in the conductive state until the transistor is made nonconductive by the lower limit comparator. In a sump pump application, latching of the SCR allows the pump to remain activated after the liquid level is reduced below the upper probe.

Abstract: A submersible pump such as a sump pump or sewage pump has a handle which also serves to provide electrical connections and an oil port. The handle has two barrels which extend through the top of the pump casing and receive nuts which secure the handle on the pump. O-rings are provided beneath flanges on the barrels for sealing purposes. Retainers for the O-rings hold them beneath the flanges. One barrel has electrical terminal pins molded into it. A power cord can be connected with the pins by inserting a plug on the cord into a socket on the barrel. Within the pump casing, the terminal pins are connected with wiring for the motor. An external float switch controls the on and off conditions of the motor. The second barrel provides an oil passage which may be closed by a removable threaded plug.

Abstract: A gas boiler having a boiler unit constructed by interconnected boiler sections each having an internal waterway bounded by one or more heat transfer surfaces. Baffles on the boiler sections define serpentine flue passages, and the baffles include bypass openings formed by notches and/or slits to suppress standing waves and associated noise. A burner includes a conical burner element having burner ports arranged in clusters to enhance the flame distribution and stability. A distributor cone nested within the burner element provides a pressure drop for noise suppression. The blower shaft is equipped with a magnetic plastic washer which effects a seal against air infiltration while allowing the blower shaft to shift from side to side.

Abstract: An electric convection space heater for placement adjacent to a wall includes a plurality of elongated electric heating elements positioned in an elongated housing having a front panel having an elongated cold air inlet, a back panel for placement adjacent to a wall and a top portion with a plurality of elongated heated air outlet slots. The heating elements are arranged to extend longitudinally in the housing below the outlet slots with the heating elements horizontally disposed in spaced apart stair-step configuration with each heating element being located at progressively lower elevations from the front panel to the rear panel. The outlet slots occupy a front to back dimension on the housing top portion which exceeds the distance between the front and back elements.

Abstract: A gas boiler having a boiler unit constructed by interconnected boiler sections each having an internal waterway bounded by one or more heat transfer surfaces. Baffles on the boiler sections define serpentine flue passages, and the baffles include bypass openings formed by notches and/or slits to suppress standing waves and associated noise. A burner includes a conical burner element having burner ports arranged in clusters to enhance the flame distribution and stability. A distributor cone nested within the burner element provides a pressure drop for noise suppression. The blower shaft is equipped with a magnetic plastic washer which effects a seal against air infiltration while allowing the blower shaft to shift from side to side.

Abstract: A tee shaped electrical connector for a pump such as a sump pump having a pump motor controlled by a float switch. A power cord carrying a plug on one end extends from one leg of the connector body. A float switch cord extends to the float from another leg of the connector. The third leg of the connector includes electrical contacts to which the power cord and float switch wiring extend. Electrical terminal pins for the motor leads project into a socket on the pump so that the contacts and terminals connect electrically when the connector is applied to the socket.

Abstract: A jet pump having a rotatable venturi cartridge to permit any of several different sized venturi tubes to be aligned with a nozzle in the pump casing. A knob is provided on the pump casing to permit convenient rotation of the venturi cartridge. Printed indicia on the knob align with an indicator arrow to visually indicate the setting of the knob.

Abstract: A side wall termination unit for a gas boiler which terminates side by side vent and air supply pipes extending through a building side wall. The pipes extend through inside and outside plates on the internal and external wall surfaces. A one piece termination cap is mounted on the outside plate and includes a sleeve which holds the vent pipe in alignment with a vent opening in the cap. The intake end of the air supply pipe is butted against stops to keep it exposed. Extending around the sleeve and stops is a wall formed by spaced apart fingers which present between them air intake openings for allowing outside air to enter the intake pipe. A peripheral flange on the termination cap is spaced outwardly from the building wall to provide an air intake slot.

Abstract: A sump pump powered by a rechargeable battery has a circuit for monitoring the battery voltage and controlling charging of the battery. Four comparators monitor the battery and control two flip flops one of which operates the pump in cooperation with a float switch and the other of which turns the battery charging circuit on and off. The circuit is arranged so that when the battery is in its discharge cycle, the float switch controls the pump and the charging circuit comes on only when the battery voltage is in a low range. In the charging cycle, the pump is locked out in a low voltage range of the battery and is controlled by the float switch only in a high voltage range.

Abstract: A microprocessor based system for detecting leaks from underground gasoline storage tanks and the product lines through which the gasoline is pumped to above ground dispensers. Hydrocarbon sensitive probes spaced around the tank in monitoring wells detect gasoline leakage from the tank. Each probe can be independently programmed as to the threshold hydrocarbon concentration considered to be indicative of a leak. Pressure transducers sense the product line pressure and distinguish thermally induced contraction from true leaks by comparing the time required for a preselected pressure drop to occur during successive cycles. A time comparison is also used to detect the presence of excessive air in the product line. An alarm condition sensed by either type of sensor generates audible and visible alarm signals and automatically dials a programmed telephone number. The alarm times and dates are stored in memory and may be called up on the display screen.

Abstract: An archimedic or logarithmic scroll is used with an axial fan to provide a smooth and relatively quiet air flow over the electric heating elements. Additionally a lip 21 is mounted at the air outlet to prevent heated air from being drawn back through the axial fan.

Abstract: An improved boiler feed water deaerator is provided which includes a plurality of spray valve assemblies therein which are shielded to effectively eliminate undesirable valve chattering and vibrations resulting from the horizontal component of incoming feed water and turbulent water flow through the valves. The valves hereof include an elongated, tubular, open ended water flow-directing shield with a shiftable valve plug adjacent the outlet end thereof. The plug is secured to an elongated stem disposed axially within the shield, and support structure is provided for the stem adjacent the upper inlet of the shield for permitting reciprocation and limited pivoting movement of the stem and plug.