Honeywell AUTOMATIC CONTROL User Manual

ENGINEERING MANUAL OF AUTOMATIC CONTROL
CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
358
Fig. 82. Multibuilding, Variable Speed Pumping Control.
RETURN
BLDG. D
RETURN
BLDG. C
RETURN
BLDG. B
RETURN
VALVE V-1
RETURN
BLDG. A
VSD
CONTROL
WHEN ALL BLDG. A VALVES ARE LESS THAN
75% OPEN, VALVE V-1 DP SETPOINT IS
DECREMENTED DOWN PSI EVERY
MINUTES.
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 PSI EVERY
MINUTES.
WHEN ANY V-1 VALVE IS GREATER THAN
95% OPEN, VALVE V-1 DP SETPOINT IS
INCREMENTED UP AT THE SAME RATE.
MANUAL
PERCENT
OPEN VALUE
AUTO
88
55
88
100
65
8.5
0.8
0.8
8.5
25
55
MANUAL
AUTO
SELECTOR
PERCENT
OPEN
CURRENT
SETPOINT
DP
CONTROL
MAX
MIN
MULTI-BUILDING VARIABLE FLOW CONTROL CONCEPTS
AHU CONTROL
VALVES V2
(TYPICAL)
M10676
VALVE VI
VALVE VI
VALVE VI
INSET (ONE PER BUILDING)

Honeywell AUTOMATIC CONTROL Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL
Category	Controller
Language	English