Honeywell AUTOMATIC CONTROL Engineering Manual page 368

CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
MANUAL
PERCENT
OPEN VALUE
MAX
MIN
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.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
MULTI-BUILDING VARIABLE FLOW CONTROL CONCEPTS
INSET (ONE PER BUILDING)
MANUAL
100
AUTO
SELECTOR
88 AUTO
CURRENT
SETPOINT
55
DP
CONTROL
65
55
RETURN
25
VSD
CONTROL
0.8
PSI EVERY
8.5
MINUTES.
0.8
PSI EVERY
8.5 MINUTES.
Fig. 82. Multibuilding, Variable Speed Pumping Control.
PERCENT
88
OPEN
358
AHU CONTROL
VALVES V2
(TYPICAL)
VALVE V-1
BLDG. A
RETURN
VALVE VI
BLDG. B
RETURN
VALVE VI
BLDG. C
RETURN
VALVE VI
BLDG. D
RETURN
M10676