Space Temperature Control Of Zone Mixing Dampers And Reset Of Hot Deck Temperature - Honeywell AUTOMATIC CONTROL Engineering Manual

AIR HANDLING SYSTEM CONTROL APPLICATIONS
SPACE TEMPERATURE CONTROL OF ZONE MIXING DAMPERS AND RESET OF HOT
DECK TEMPERATURE
Functional Description
9
AS THE DEMAND FOR HEAT FROM THE ZONE WITH
THE GREATEST DEMAND FOR HEAT VARIES FROM
ZERO TO
SETPOINT SHALL VARY FROM THE MIXED AIR
TEMPERATURE TO
AS THE DEMAND FOR HEAT FROM EACH ZONE VARIES
FROM
DAMPERS SHALL MODULATE FROM CLOSED TO OPEN.
AS THE DEMAND FOR HEAT FROM THE ZONE WITH
THE GREATEST DEMAND FOR HEAT VARIES FROM
55
SETPOINT SHALL VARY FROM
Item
No. Function
1-2 Control system energizes when fan is turned
on (See FAN SYSTEM START-STOP
CONTROL).
3-4 Zone mixing dampers modulate to maintain
zone temperature setpoint.
5-7 Hot water valve modulates to maintain hot
deck temperature setpoint.
ENGINEERING CMANUAL OF AUTOMATION CONTROL
10
CONTROL
PROGRAM
33
5
NO
8
56
MA
ON
1
15
%, THE HOT DECK TEMPERATURE
80
DEGREES.
15 55
TO %, ITS HOT DECK
TO 100%, THE HOT DECK TEMPERATURE
80
105
DEGREES.
% SPACE
SETPOINT
OPEN TEMP.
4
74
46
74
62
74
83
90
SETPOINT 6
3
2
90
NORMAL
72%
7
HOT
DECK
TO
8 MA temperature determines hot deck reset
schedule start point.
9 Dynamic graphic sequence display permits
the operator to adjust program setpoints.
Program adjusts hot deck temperature based
upon operator inputs.
10 Control program coordinates load reset,
temperature, and fan interlock programs.
226
74
HALL
LOBBY
74
EAST
OFFICE
WEST
74
OFFICE
PERCENT
OPEN TO
HOT DECK
ZONE
SA
MIXING
DAMPERS
M10461