Page 281

NORA Oilheat Technicians Manual

Two pipe system This system incorporates the use of a separate supply and return pipe from the boiler to each piece of the radiation. The preferred way to pipe this is the first piece of radiation to be taken off the supply is the last returned to the boiler. Likewise, the last supplied is the first returned. This produces a uniform and balanced design that requires no special valves or fittings. See Figure 13-13. Components of hot water heating systems Radiation Hot water is an easily adaptable and transportable medium that lends itself to all sorts of radiation. The five most common types of radiation are the conventional radiator, the convector, the fan-coil unit, baseboard, and radiant panel. The conventional radiator is usually made of cast iron sections that either rest on the floor or mount on the wall. Radiators are normally found in older systems. The convector is a series of finned-tube Figure 13-13: Two-Pipe sections enclosed within a cabinet. They are reverse return constructed of either cast-iron sections or steel. Baseboard radiation is constructed of cast-iron panels or copper pipe covered with aluminum fins that create surface area for heat transfer. In larger system applications, the pipe and fins can be constructed of steel. Fan-coil or unit heaters are coils of fin tube element with a fan that blows air over the coils. They are especially suited to rooms where there is little wall space Chapter 13—Heating Systems 13-11 Figure 13-11: One-pipe system One-pipe fittings. Arrows show direction of water flow. Figure 13-12: Monoflow tees Chapter 13 Heating Systems Supply Main Boiler Return Main 2nd Floor 2nd Floor Down One-pipe Main in Basement To Terminal Unit From Terminal Unit


NORA Oilheat Technicians Manual
To see the actual publication please follow the link above