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Operating Procedures
Table 13. Fan control options (continued)
Screen
Tonnage and Power Calculations
When a user clicks the graphic display of demand,
capacity, and speed, the tonnage and power data pop-up
page is displayed.
Figure 19. Power and capacity control screen
42
Controls
Compressor speed-based SP control:
•
Looks at running compressors average speed to
decide on increasing or decreasing SP.
•
Initial SP – When chiller starts this becomes the
control SP.
•
Low/High Speed SP – If compressors average
speed remains below Low Speed SP, resulting SP
will be decremented every SP Period seconds by
Delta SP. And visa versa, if compressors average
speed remains above High Speed SP, resulting
SP will be incremented every SP Period seconds
by Delta SP.
Wet bulb-based SP control:
•
Looks at wet bulb temperature reading.
•
Resulting SP includes also WB SP Offset which
adds up to wet bulb temperature.
•
This type of control SP available for fan bank 1
only that is cooling tower control for Water-Cooled
Chillers.
Access
ARTC-SVX013A-EN
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