the symbols you should be familiar with are
Hot water circulates through a single main and
presented in figures 4-1 through 4-5. Additional
through each radiator in turn. You can see that the
symbols are listed in appendix A.
water reaching the last radiator will be cooler than the
water in the first. In order to obtain the same amount
of heat from each radiator in a one-pipe system, each
4-2.
HOT-WATER HEATING SYSTEMS
radiator must be larger than the one before it with the
Circulation of water which has been heated at a
last radiator being the largest of all. It is apparent
central source through pipes to radiators or
that the one-pipe system is adequate for very small
convectors and back to the heating unit describes a
installations only.
hot-water heating system. Usually, you will find that
a pump is used to keep the water circulating; gravity
b. Two-Pipe System. You will find that the
systems are seldom used. There are two classes of
disadvantages of the one-pipe system are largely
hot-water systems: the one-pipe system and the two-
offset in a two-pipe system. Figure 4-7 shows a two-
pipe system.
pipe hot-water heating system. You can see that the
hot water from the heater unit goes directly to the
a. One-Pipe System. The one-pipe system
five radiators via the main, tees, and elbows. The
(fig 4-6) is the simplest type of hot water installation.
cooler water leaving the radiators goes back to the
Figure 4-1. Heating piping symbols.
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