(b) a combustion chamber within the sealed housing; and. Designed for new construction and renovation projects, the z35 provides maximum heat and ultimate energy efficiency with easy, one-touch programmable control. The air to fuel adjustment device constructed according to principles of this invention allows for adjustment of the air to fuel ratio for a sealed-combustion type fireplace or heater. Using silica sand in a propane fireplace can limit the amount of propane that rises to the surface and decrease the size of the flames. The combustion air mixes with the fuel to form a combustible mixture that is ignited by an ignition source to form a flame that projects from the air-fuel burner system into the fireplace via openings in the burner system. a closed end opposite the fuel source inlet; and. The air shutter 54 has an open or slotted portion 56 that is of the same or smaller dimension as that of the air inlet port 52. The venturi 38 includes an attachment fitting 44 at one end portion 46 of the venturi body 40. However, such sealed-combustion type fireplaces do not permit access for adjustment of the air to fuel ratio while the fireplace is in operation. Natural gas regulators may require adjustment as a result of changes in the system or incorrect adjustment by service personnel. In a particularly preferred embodiment, the openings are positioned along a topmost portion of the burner tube body 78 to facilitate dispensement of an air-fuel combustion mixture onto a ceramic log (not shown) and the like that is placed on top of the burner tube. 3 illustrates a second preferred embodiment of a combustion air to fuel ratio adjustment device constructed according to principles of this invention for use with a sealed-combustion chamber fireplace. It is to be understood that although the venturi body for the first preferred embodiment has been configured having a generally cylindrical shape, i.e., having a circular cross section, a venturi body configured having other geometrically shaped cross sections is possible and such sections are, therefore, intended to be within the scope of this invention. Movement of the cover about the body in one direction causes the air aperture to close while movement of the cover in an opposite direction causes the air aperture to open. As used herein the term "sealed combustion heater" includes sealed combustion fireplaces having one or more glass panels enabling viewing of the flames. The fireplace includes a fresh air plenum 19 that is formed between the bottom and side walls 20 and 12 and a first and second baffle 24 and 26. It is common that these lips will corrode which inhibits the venturi from locking securely into place. & Terms of Use. The burner tube 76 is attached at end 86 to a stationary member within the fireplace such as a baffle so that transverse movement of the actuator arm 104 by a user causes the shutter arm 98 and air shutter 92 to rotate around the burner tube body 78 and effect the opening and closing of the combustion air aperture 96. The air-fuel mixing body 34, which can have a number of different configurations, serves to mix the fuel exiting the tubing 32 with combustion or primary air provided from the fresh air plenum 19 to form a combustible air-fuel mixture. The fuel source piping 28 connects to a fuel source valve 30 that is also disposed within the fresh air plenum 19. Natural gas, when combusting poorly, can most certainly produce soot. Gas burners burn blue if the ratio of fuel to air is correct. An air shutter or cover 54 is partially disposed concentrically or circumferentially around the venturi body 40 at end 48. The burner tube 76 has a generally cylindrical body 78 and an annular interior passageway 80 that extends therethrough. Alternatively, the air shutter can be a single flap that extends along the venturi body and that is positioned over the air inlet port, thereby eliminating a need for a slot. Privacy Policy A zero clearance fireplace as set forth in claim 1 which further includes a gas burner connected to a gas control valve, a temperature limit switch connected to said gas control valve for shutting off gas to said gas burner when the fire in said combustion chamber becomes hotter than a predetermined limit. These and other aspects and advantages of the present invention will become appreciated as the same becomes better understood with reference to the specification, claims and drawings wherein: FIG. 3,638,635. a number of openings disposed through a wall portion of the burner tube body, wherein mixed combustion air and fuel is distributed through the burner tube and dispensed from the tube via the openings for combustion to form a flame within the combustion chamber. The arm 60 is used to facilitate rotatable movement of the air shutter 54 about the venturi body. The mixing body includes at least one combustion air inlet port disposed through a wall of the body. It is desired that the first and second preferred embodiments of the combustion air to fuel ratio adjustment device be formed from a structurally strong and fire resistant material such as steel or steel alloy. SEE PAGE 16. (c) a combustion air-to-fuel ratio adjustment means which comprises: (i) an air-fuel mixing body within the sealed housing including a fuel source inlet, and at least one combustion air inlet port; and, (ii) air adjusting means within the sealed housing for adjusting the amount of air entering the air-fuel mixing body, said air adjusting means being operable independently from any means for adjusting the amount of fuel entering the air-fuel mixing body; and. a fuel source inlet at one end of the body to accommodate connection with a fuel source; and. (b) a combustion chamber within the sealed housing; (c) an air to fuel adjustment device comprising: (i) an air-fuel mixing body within the sealed housing having an annular passage extending therethrough, the mixture body comprising: a fuel source inlet at one end of the body to accommodate connection with a fuel source; and at least one combustion air inlet port disposed through a wall portion of the body, wherein the air inlet port is positioned adjacent the fuel source inlet; and, (ii) an air inlet port cover disposed concentrically around an outside surface of the air-fuel mixing body adjacent the air inlet port and movable with respect to the body, wherein placement of the cover over and with respect to the air inlet defines a combustion air aperture, wherein movement of the cover around the body in one direction increases the size of the air aperture, and movement of the cover around the body in an opposite direction decreases the size of the air aperture; and. The attachment fitting is in the form of a flange-type fitting to accommodate attachment with an air-fuel burner system (not shown) disposed within the combustion chamber of the fireplace. Rotate the knob to the left and push in to allow gas to flow to the pilot light. The air inlet port 52 extends from the end 48 of the venturi body 40 a distance toward the attachment fitting 44. Combustion air needed to burn fuel is routed from the fresh air duct to the combustion chamber by a fresh air plenum inside of the fireplace. Example: A natural gas fireplace that has an input of 30,000 BTU per hour consumes 30,000 / 1000 = 30 cubic feet/hour. venturi tube for proper primary air adjustment. It is understood that the fresh air duct may extend horizontally, vertically or any suitable angle from the fireplaces. Any time they are used, the damper in the fireplace needs to be opened so the It is, therefore, desirable that a sealed-combustion type fireplace include a mechanism for adjustment of the combustion air to fuel ratio during use, thereby allowing a user to adjust the flame resulting from combustion of such air to fuel mixture. Like the first preferred embodiment, an air shutter or cover 92 is partially disposed concentrically or circumferentially around the burner tube body 78 at end 86. Venturi Adjustment 14-15 REPLACEMENTS Ordering Replacement Parts Replacement Parts Accessories Vent Kits Terminal Kits 16-17 TROUBLE SHOOTING GUIDE 3 WS-415-63 / 11.24.98 NAPOLEON gas fireplace… The venturi 38 has a generally cylindrical body 40 with an annular interior passage 42 that extends therethrough. The burner tube has a closed end 82 at one end of the body 78 and a plurality of openings 84 that extend through a wall portion of the body. The ability to adjust the flame appearance during operation of the fireplace from a position outside of the fireplace also permits safe adjustment of the flame appearance, because such adjustment is made without having to contact a hot fireplace member. An air inlet port cover is movably disposed adjacent the air-fuel mixing body and forms an adjustable air combustion aperture by placement of the cover adjacent the air inlet port. a number of openings disposed through a wall portion of the burner tube body, wherein mixed combustion air and fuel is distributed through the burner tube and dispensed from the tube via the openings for combustion to form a flame within the fireplace. Alternatively, the actuator arm 72 can be formed from cable, chain or the like. In this embodiment, an air shutter arm or cover arm 98 has a limiter 100 and an attachment fitting 102, and an actuator arm 104 has an air-tight fitting 106 which all connect and function in the same manner as that described above and illustrated in FIG. During the operation of a sealed-combustion type fireplace it is desired that the flame produced as a result of combustion of the air-fuel mixture be similar in appearance to the flame produced in a conventional wood-burning fireplace. Accordingly, it is to be understood that the combustion air to fuel ratio adjustment devices constructed according to principles of this invention may be embodied other than as specifically described herein and thus are measured by the appended claims, not the disclosure. 1 W415-0341 / F / 11.21.05 GAS - DIRECT VENT MILLIVOLT SYSTEM INSTALLATION AND OPERATION INSTRUCTIONS FOR VENTED GAS FIREPLACE Installation and … The actuator arm preferably has a handle and the like at the end portion that extends from the fireplace to facilitate easy gripping and operation by a user seeking to adjust the size of the combustion air aperture 58. An exhaust gas plenum 27 extends from a top portion of the combustion chamber 22 and is connected to an exhaust gas duct 29 that also passes through the interior wall of the home or structure to facilitate the passage of combustion gases from the fireplace to the outdoor environment. Make sure outlet (manifold) pressure is … The venturi 38 includes a fuel source inlet (not shown) at an opposite end 48 of the venturi body 40 to accommodate connection with fuel source piping 50. Be sure that the valve orifice extends at least 1/4 of an inch into the venture tube. The fireplace, the gas log pilot light, and, for example, a boiler will consume different amounts of propane and the cost will be different respectively. Piping 50 forms an axis of rotation for arm 60. a closed end at one end of a burner tube body opposite from the fuel source inlet; and. 1 illustrates a sealed-combustion type fireplace or heater comprising a combustion air to fuel ratio adjustment device constructed according to principles of this invention. posted by ssg at 3:14 PM on January 6, 2014 Central opening ( not shown ) to accommodate placement of the sealed housing ;.. End 82 comprising a combustion air to fuel ratio while the fireplace ( See FIG lips on right. 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