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CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
MANUAL
PERCENT
OPEN VALUE
100
MAX
450
MIN
175
CONTROL
WHEN ALL BLDG. A VALVES ARE LESS THAN
75% OPEN, VALVE V-1 DP SETPOINT IS
DECREMENTED DOWN
WHEN ANY BLDG. A VALVE IS GREATER
THAN 95% OPEN, VALVE V-1 DP SETPOINT
IS INCREMENTED UP AT THE SAME RATE.
WHEN ALL V-1 VALVES ARE LESS THAN 75%
OPEN, THE VARIABLE SPEED PUMPING
SYSTEM DP SETPOINT IS DECREMENTED
DOWN
WHEN ANY V-1 VALVE IS GREATER THAN
95% OPEN, VALVE V-1 DP SETPOINT IS
INCREMENTED UP AT THE SAME RATE.
MULTI-BUILDING VARIABLE FLOW CONTROL CONCEPTS
INSET (ONE PER BUILDING)
MANUAL
AUTO
SELECTOR
88
AUTO
CURRENT
88
SETPOINT
380
kPa
DP
CONTROL
kPa
380
kPa
RETURN
kPa
VSD
5.5
kPa EVERY
8.5
MINUTES.
5.5
kPa EVERY
MINUTES.
8.5
Fig. 82. Multibuilding, Variable Speed Pumping Control.
VALVE V-1
PERCENT
OPEN
VALVE VI
VALVE VI
VALVE VI
ENGINEERING MANUAL OF AUTOMATIC CONTROL
356
AHU CONTROL
VALVES V2
(TYPICAL)
BLDG. A
RETURN
BLDG. B
RETURN
BLDG. C
RETURN
BLDG. D
RETURN
M15292
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