| 摘要 |
An fuel-fired hot water furnace includes the use of an improved combustion chamber, heat exchanger and breaching damper, and further includes utilizing the water heated in the furnace as the means of heating a separate domestic supply of water directed through a side car hot water heater in fluid communication with the furnace. The improved combustion chamber includes a primary combustion cylinder which is orthogonally attached to a secondary combustion cylinder, and the secondary combustion cylinder is provided with a necked-down discharge so as to facilitate a thorough burning of a fuel and air mixture. The heat exchanger includes a primary rise and fall arrangement for the combustion gases so as to provide for maximum heating of the water within the heat exchanger prior to the gases being emitted outwardly from the furnace through a breaching tube, and the breaching damper is provided within the breaching tube so as to regulate the rate of combustion gas flow. The breaching damper utilizes an adjustable stop to regulate gas flow, and further utilizes a mercury switch to shut off the fuel burner in the even that the damper is closed. The damper may also move beyond the adjustable stop position in the event of an undesirable increase in pressure within the furnace through the overcoming of a closing force exerted by a weighted stop arm. The side car water heater has an inner chamber through which the hot furnace water passes, and the domestic water to be heated is directed through loosely positioned coils in the inner chamber so that convection heat may be transferred from the heated furnace water to the domestic water supply.
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