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28 TRG-TRC016-EN
notes
period two
Chilled-Water System Design
Load-Terminal Control
The purpose of load-terminal control is to modulate the flow of air or water
through the coil to maintain building space comfort. This is accomplished by
measuring the temperature of the supply air or space. The temperature then
converted to an electronic signal that modulates the capacity of the cooling
coil to match the changing load in the space.
Three methods of load-terminal control are commonly used in
chilled-water systems.
n Three-way modulating valve control
n Two-way modulating valve control
n Face-and-bypass damper control
Each of these methods has a different effect on the operation of the system.
Load-Terminal Control Options
▲ Three-way
modulating valve
▲ Two-way
modulating valve
▲ Face-and-bypass
dampers
Figure 33