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NORA Oilheat Technicians Manual

Figure 13-4: Counterflow furnace Figure 13-5: Horizontal furnace Flue Connection Chapter 13—Heating Systems 13-5 senses the temperature of the air rising in the unit. The lower control turns the blower off when it senses a decrease in the temperature of the air being blown down through the furnace. See Figure 13-4. Horizontal furnace: A horizontal furnace is often described as a highboy furnace on its side. These units are normally used in crawl spaces or suspended from a ceiling. The air travels through these units in a horizontal pattern with return air entering on one side and supply air discharging through the opposite end. See Figure 13-5. The distribution system Figure 13-6 (following page) shows the main components and fittings found in a warm air distribution duct system. The distribution or duct system is comprised of three main parts. Plenums: These are boxlike chambers connected to the furnace. There are two plenums in the modem furnace, one on the supply side and one on the return. The plenum should always be the same size as Chapter 13 Heating Systems Warm Air Outlet Burner and Controls Filter Return Air Inlet Filter Return Air Inlet Flue Connection Warm Air Outlet


NORA Oilheat Technicians Manual
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