Honeywell AUTOMATIC CONTROL User Manual

ENGINEERING CMANUAL OF AUTOMATION CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS
248
YEAR-ROUND SYSTEM CONTROL PROCESSES
HEATING, COOLING, AND ECONOMIZER
Functional Description
M10478
OA
EA
RA
SA
3
2
ON
ON
1
100
5
100
1619
4
20
NORMAL
ECONOMIZER DECISION.
REFER TO PREVIOUS
ECONOMIZER OPTIONS
OA MINIMUM SETPOINT
(NOTE: THE TEST AND BALANCE
INITIAL VALUE FOR PROPER
VENTILATION IS 22)
7
6
22
CONTROL
PROGRAM
22
96
17
14
18
105
55
SUPPLY AIR
TEMPERATURE
SETPOINT
SPACE
HEATING
DEMAND
100
0
75
55
SUPPLY AIR
TEMPERATURE
SETPOINT
CHW
COOLING
DEMAND
0
100
75
57
SUPPLY AIR
TEMPERATURE
SETPOINT
FREE
COOLING
DEMAND
0
100
64
21
036
SUPPLY
FAN
PERCENT
OPEN
NC
NO
NC
SPACE TEMPERATURE
15
59
64
11
9
10
74
76
2.0
8
76
SETPOINT
13
72
SETPOINT
100
0
CHILLED WATER COOLING
SETPOINT = FREE COOLING
SETPOINT PLUS
FREE COOLING
SETPOINT
(1.5 MINIMUM)
12
2.0
HEATING SETPOINT = FREE
COOLING SETPOINT MINUS
(1.5 MINIMUM)
Item
No. Function
1-3 Control system energizes when fan is turned
on (See FAN SYSTEM START-STOP
CONTROL).
4-6 Mixing dampers modulate to maintain
minimum ventilation value and free cooling
SA temperature setpoint.
7 Economizer enables free cooling when OA is
appropriate.
8 Space temperature dictates heat and cool
demands.
9-13 Free cooling setpoint and heat/cool deadband
values determine the SA temperature setpoint
for hot and chilled water control setpoints.
Software has a minimum 1.5 Fahrenheit
degree heating and cooling deadband.
14 Heat demand varies SA temperature setpoint.
15,16 Hot water valve modulates to maintain SA

Honeywell AUTOMATIC CONTROL Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL
Category	Controller
Language	English