Abstract: The invention concerns a control device for gas boilers. The overall functions involving control and safety are ensured by a control box (26) with microprocessor which centralizes data collected from the ambient thermostat (27), the temperature sensor (28) on the duct (21) for heating water return, the air output sensor (19), the drawing contact (31), the extraction fan (6) speed sensor (30), and the lighter (24), and it converts them into digital signals that are made to operate the lighter, the circulation pump (19), the gas inlet electrovalve (12) and the extraction fan according to the control data that the microprocessor has memorized. Application for forced draft steamtight gas boilers.

Abstract: The invention relates to a forced draft household gas boiler having a sealed enclosure for the combustion assembly of the boiler.A sealed shell (15) envelopes a cylindrical heat exchanger (6) and is suspended in the upper half of a frame (1) from a horizontal plate (4) so that a central inlet opening (11) of the heat exchanger is in the axis of an outlet tube (32) of a fan (29) which directs an air/gas mixture into the burner. An outlet opening (23) for the combustion products collected in the sealed shell (15) is located within the circumference of the shell and at least approximately in the axis of an evacuation pipe (18) for evacuating combustion products external of the boiler.

Abstract: A gas-tight chamber for a heat exchanger has a shell (12) forming the gas-tight chamber made of a light flexible or semirigid material such as rubber or thin silicone-treated sheet material which, because of its low weight and relative flexibility, absorbs all the vibrations produced and maintained by the burners, which eliminates the noise. The exchangers have a layer of longitudinal water tubes arranged concentrically around a central burner.

Abstract: A control mechanism for a gas-fired hot water heater, which operates without a permanent burner pilot, has an electrical circuit for selectively operating an igniter in response to gas pressure in the heating system. The water heater has a main chamber for providing gas to the igniter pilot and the burner element, and a secondary chamber for providing gas to a safety pilot. Circuitry responsive to a high gas pressure in the main chamber activates the igniter and circuitry responsive to a high gas pressure in the secondary chamber interrupts operation of the igniter. Continuous operation of the igniter element is thereby prevented, for example, due to a low gas pressure condition.

Abstract: An apparatus for heating water with solar radiation incorporates an auxiliary heating unit, external to the hot water reservoir and bypassing the solar heating element, for providing auxiliary water heating whenever the temperature in a selected portion of the reservoir decreases below a predetermined level. A common return conduit in combination with a single supply pump and a selector valve enable the auxiliary heating "by-pass" circuit to be simply and quickly added to already existing installations.

Abstract: The fail-safe gas valve solenoid construction disclosed herein employs a fixed electromagnet which, when energized, actuates an operating rod by means of an armature which is relatively loosely secured to the shaft to permit self-alignment between the magnet and the armature. Relative movement and wear between the armature and the shaft is inhibited by an elastomeric washer or O-ring which is interposed between the armature and a corresponding or facing surface associated with the shaft, the washer being under slight compression.

Abstract: The present invention relates to a sending and receiving station for a pneumatic transporter. A cartridge carrying tube is located at the point of arrival of a vertical terminal line during sending while it is inclined during reception with a lateral wall deflecting containers which arrive at the station. Turning movement of the tube is controlled by a pivoting valve which acts on an external edge of the tube to place it in vertical position for sending. The present invention is used at receiving and sending stations functioning under vacuum-pressure.

Abstract: The safety device disclosed herein is adapted for use with low power gas burning water heaters which are unvented. In order to limit the duty cycle of the heater, a thermal mass having a preselected thermal inertia is heated from the burner through a probe of limited heat conductivity so that the temperature of the thermal mass rises relatively slowly during operation of the heater and cools relatively slowly in the intervals between operation. If the thermal mass reaches a predetermined threshold temperature, the heater is turned off or sharply throttled back so as to limit the emission of combustion products into the atmosphere.