Cold Deck System With Zone Damper Control - Honeywell AUTOMATIC CONTROL Engineering Manual

COLD DECK SYSTEM WITH ZONE DAMPER CONTROL

Functional Description
AS THE DEMAND FOR COOLING FROM THE ZONE
VARIES BETWEEN ZERO AND
DECK DAMPERS MODULATE BETWEEN CLOSED AND OPEN.
AS THE DEMAND FOR COOLING FROM THE ZONE WITH THE
GREATEST DEMAND FOR COOLING VARIES BETWEEN
50
SETPOINT VARIES BETWEEN THE MIXED AIR
TEMPERATURE AND
9
78
7
Item
No. Function
1 Control system energizes when fan is turned
on (See FAN SYSTEM START-STOP
CONTROL).
2-4 Zone mixing dampers modulate to maintain
space temperature setpoint.
5,6 Chilled water valve modulates to maintain
cold deck temperature setpoint.
7 Mixed air temperature determines cold deck
temperature setpoint at zero cooling load.
8 Control program coordinates zone demand,
temperature, and fan interlock control.
9 Dynamic graphic sequence display permits
the operator to adjust program setpoints.
50
AND 100%, THE COLD DECK TEMPERATURE
55
MA
ON
1
5
66
8
CONTROL
PROGRAM
AIR HANDLING SYSTEM CONTROL APPLICATIONS
%, ITS COLD
DEGREES.
COLD
DECK
6
2
55
46
46
46
PERCENT
OPEN
FEATURES
1. A mixing damper and temperature sensor for each zone
provides individual zone control. (Three zones shown).
2. A single cooling coil or group of coils furnishes cooling
for the entire system.
3. A constant volume of air is delivered to each zone.
4. Cold deck temperature is maintained just low enough to
satisfy the zone requiring the greatest amount of cooling
which provides efficient operation when used in conjunction
with a hot deck coil/control multizone system.
241 ENGINEERING CMANUAL OF AUTOMATION CONTROL
ZONE
SA
MIXING
DAMPERS
4 3
76
76
HALL
LOBBY
76 76
EAST
OFFICE
WEST
76
76
OFFICE
SPACE
SETPOINT
TEMPERATURE
M10475