JOHNSON CONTROLS
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SECTION 1 - DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
FORM 160.67-O2
ISSUE DATE: 10/9/2020
1
vanes completely closed. The combination of speed
control and PRV control will provide capacity reduc-
tion from 100% to 15% of design for normal air condi-
tioning applications.
If the tower water temperatures must be held above
75ºF for other chillers on the same tower circuit, the
capacity control logic can be programmed to automati-
cally limit the amount of speed reduction and PRV clo-
sure to maintain stable operation. The hot gas bypass
valve is then modulated to admit condenser gas into the
evaporator and reduce the cooling effect as required.
This will maintain a constant leaving chilled liquid
temperature with loads down to 10% of design.
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