Instructions / Assembly

Chapter 28 Ductwork
A-coil
Supply air ^ Supply air
Liquid
line
Suction
Slant coil
Supply
air
Liquid
tine
Condensate
catch pan
Equalizer
Condensate
drain
Return air
Suction
Return air
Upright coil
Liquid
line
Suction
Supply
air
Condensate
catch pan
Condensate
drain
Condensate
catch pan
Condensate
drain
Figure 28-6. The three types of air conditioning evaporators. In residential installations, the A-coii type is most
commonly used.
building that is odd-shaped or long cannot use the plenum is extended with rectangular duct, and all
radial system.
28.3.2 Extended Plenum System
An extended plenum system, Figure 28-8,
combines rectangular duct with round pipes. The furnace
round pipes branch out at right angles from the
extended plenum. This permits short lengths of round
pipe to reach the registers. For a neat appearance, the
round pipes are normally installed in the spaces between
the flooring joists. It is necessary to cut a hole and add
a register boot at the end of each run.
Stack pipe
Register boot
Round pipe Takeoff or start collar
Figure 28-7. The radial piping system uses round pipes running straight to the register boots. In this exampie, the stack pipe
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