Honeywell AUTOMATIC CONTROL User Manual

ENGINEERING MANUAL OF AUTOMATIC CONTROL
BUILDING MANAGEMENT SYSTEM FUNDAMENTALS
196
CONTROL GRAPHICS
Many digital control strategies require fine tuning to assure
systems are staged and loaded without excessive surging and
cycling. Such strategies are often more comprehensive if
presented as a “Dynamic Sequence” where the specified
sequence is repeated with dynamic commandable values
embedded (Fig. 9).
DATA PENETRATION
Figures 7, 8, and 9 present data penetration concepts from
the macro to the micro levels. Graphics should be designed for
each specific operator type. For example, a security guard is
Fig. 9. Typical Graphic to Aid System Fine Tuning in the Field.
required to monitor certain critical alarm points after hours,
design special graphics of only those points, with simplified
explanations, and specific operator response messages. Use
simplified floor plan graphics with appropriately positioned
dynamic space temperatures for zone controllers. Selection of
the VAV icon (controller) presents the specified points (setpoint,
min-max airflow, damper position, etc.) on a terminal unit
graphic.
All system points should be positioned on graphics and certain
points should be specified on multiple graphics.
MINIMUM
CHILLED WATER SETPOINT
ANYTIME ANY AHU VALVE IS OPEN GREATER THAN %FOR MORE THAN
MINUTES AND THE TIME IS BEFORE , THE LEAD CHILLED WATER PUMP STARTS.
ANYTIME BOTH CHILLERS ARE RUNNING AND THE CHILLED WATER DIFFERENTIAL
TEMPERATURE IS LESS THAN FOR MORE THAN MINUTES, THE LAG
CHILLER PUMP STOPS AND REMAINS OFF AT LEAST MINUTES.
MAXIMUMCURRENT
45
20 3
1545
1.0
4.4
4.0
30
ANYTIME ONLY ONE CHILLER IS RUNNING AND ALL AHU CHILLED WATER VALVES ARE
LESS THAN % OPEN AND THE CHILLER PLANT DIFFERENTIAL TEMPERATURE
IS LESS THAN F, THE CHW TEMPERATURE SETPOINT INCREMENTS UP AT THE
RATE OF DEGREES EVERY MINUTES
ANYTIME ANY AHU CHILLED WATER VALVE IS FULL OPEN, THE CHW TEMPERATURE
SETPOINT DECREMENTS DOWN AT THE SAME RATE
5
90
90
5.5
0.3
4
ANYTIME THE LEAD CHILLER HAS RUN LONGER THAN MINUTES, THE CHILLED
WATER TEMPERATURE IS GREATER THAN DEGREES ABOVE SETPOINT FOR
MINUTES, THE BYPASS VALVE IS CLOSED, AND THE TIME IS BEFORE ,
THE LAG CHILLER STARTS.
1545
46 52
CHILLED WATER SYSTEM
M15005

Honeywell AUTOMATIC CONTROL Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL
Category	Controller
Language	English