Honeywell AUTOMATIC CONTROL SI Edition User Manual

ENGINEERING MANUAL OF AUTOMATIC CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS
255
VAV AHU, WATER-SIDE ECONOMIZER, OA AIRFLOW CONTROL
Functional Description
Item
No. Function
1-3 Control system energizes when supply fan is
turned on (See FAN SYSTEM START-STOP
CONTROL).
4-6 Supply fan loads to maintain duct static
pressure.
7-10 During occupied periods, exhaust fan runs and
OA airflow is controlled.
11-14 When perimeter temperature is low at startup,
SA temperature setpoint is warm until RA
temperature rises.
15-16 Heating valve maintains SA temperature
setpoint during warmup.
17-18 Cooling valve maintains SA temperature
setpoint during occupied periods.
19-20 OA and MA temperatures are operator
information.
21 SA temperature setpoint switches from cooling
to heating value during warm-up modes.
22 Control program coordinates temperature
control, ventilation, and fan interlock.
63
83
13
0.45
OA
RA
ON
ON
SUPPLY AIR
TEMPERATURE SETPOINT
MAXIMUM
SETPOINT
PROPELLER
EXHAUST
FAN
PERIMETER
ZONE
PERCENT
LOAD
SPACE
SA TO VAV
BOXES
WARM-UP
MODE
M15181
2
5
6
3
7
23
22
18
4
15
21
14
12
11
17
1
9
10
19
20
13
8
24
NORMAL
NORMAL
CFM
2300
32
ON OFF
CONTROL
PROGRAM
16.5 13.5
22
76
2306
16
00
0.45
25
23.5
WARM-UP MODE INVOLVED AT OPTIMUM
START TIME IF PERIMETER SPACE
TEMPERATURE IS LESS THAN
WARM-UP ENDS WHEN RETURN
AIR REACHES
21
23.5
.
.
ANYTIME ALL VAV BOX DAMPERS ARE LESS THAN 90% OPEN, DECREMENT THE AHU
DUCT STATIC PRESSURE SETPOINT kPa EVERY MINUTES.
ANYTIME ANY VAV BOX DAMPER IS FULL OPEN, INCREMENT THE AHU DUCT STATIC
PRESSURE SETPOINT kPa EVERY MINUTES.
0.025
0.025
4.0
4.0
0.45

Honeywell AUTOMATIC CONTROL SI Edition Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL SI Edition
Category	Control Systems
Language	English