Honeywell AUTOMATIC CONTROL User Manual

ENGINEERING CMANUAL OF AUTOMATION CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS
218
ECONOMIZER CYCLE DECISION—OUTDOOR AIR/RETURN AIR
ENTHALPY COMPARISON
Functional Description
16.8
OA
MA
RA
EA
1
22
ECONOMIZER MODE SELECTOR
OA MINIMUM SETPOINT
(NOTE: THE TEST AND
BALANCE INITIAL
VALUE FOR PROPER
VENTILATION IS 22)
OTHER INPUTS
AND OUTPUTS
ENTHALPY
BTU PER POUND
ENTHALPY
BTU PER POUND
M10456
7
9
11
3
8
6
83
10
1 2
83
CONTROL
PROGRAM
1 = AUTO BASED UPON OA/RA
ENTHALPY COMPARISON.
72.0
81.0
2 = AUTO BASED UPON OA DB
BELOW DEGREES
3 = MANUAL, ECONOMIZER ON.
4 = MANUAL, ECONOMIZER OFF.
NOTE: THE SYSTEM IS LOCKED OUT OF THE ECONOMIZER
MODE ANYTIME THE OA DRY BULB IS
ABOVE DEGREES.
49
52
29.0
4 5
78
45
Item
No. Function
1 Sensor senses OA temperature.
2 Sensor senses OA humidity.
3OA enthalpy calculated from OA temperature
and humidity.
4 Sensor senses RA temperature.
5 Sensor senses RA humidity.
6 RA enthalpy calculated from OA temperature
and humidity.
7 Economizer mode selector and command
schedule.
8 Setpoint for minimum OA damper position.
9 Actuator positions OA and RA dampers.
10 Actuator positions EA dampers.
11 Control program coordinates occupancy,
temperature, smoke control, and ventilation
controls.

Honeywell AUTOMATIC CONTROL Specifications

General

Brand	Honeywell
Model	AUTOMATIC CONTROL
Category	Controller
Language	English