Carrier ZONECC2KIT-B - Page 7

than the coolest zone (in cooling) or warmer than the warmest zone
(in heating). This prevents over conditioning of OUT zones while
still using them to relieve an overload condition.
Zones can be set to OUT at any time or OUT can be programmed
like any other temperature. The home or business owner can then
program OUT for times that the zone is not likely to be occupied.
When OUT is selected, both heating and cooling set points are
replaced by "--."
SEQUENCE OF EVENTS FOR NORMAL HEATING OR
COOLING CYCLE
Given comfort set points and space temperature for zones within
system, Comfort Zone II -B will determine if active heating or
cooling is required. If so, Comfort Zone II -B will perform the
following:
1. Fully open 1 or more dampers and position others so that all
zones will be conditioned back to their set points at the same
time.
2. Turn on equipment.
3. While equipment is on, continually make small adjustments in
damper positions so that all zones converge on their set points
at the same time.
4. Turn off equipment when all zones reach their set points.
5. Leave dampers at their final positions while equipment is off.
6. If equipment does not run for 1 hour, it will fully open all
dampers.
7. If any zone is more than 1½°F overconditioned, its damper
will be fully closed.
8. If any zone is more than 2°F. underconditioned (calling), its
damper will be fully open.
This is the basic sequence of operation for the Comfort Zone II -B
system. The actual control of dampers, HVAC equipment, and
system fan will change with the configuration of system. Depend-
ing upon configuration, Comfort Zone II -B can control heat
pumps, furnaces, and dual fuel applications.
CONTROL STRATEGY FOR HEATING / COOLING STAGES
The Comfort Zone II -B system will attempt to minimize use of
additional stages of heating or cooling equipment.
Comfort Zone II -B controls multi-stage equipment in response to
the level of demand and the number of zones with demand. In
general, it tries to satisfy demand with a minimum number of
stages. In heat pump systems, where auxiliary heat is usually
expensive, a small extra demand is required to bring on auxiliary
Fig. 10—4-Zone System Wiring Diagram
A98083
O REVERSING VALVE COOL
B REVERSING VALVE HEAT
RH HEATING TRANSFORMER
RC COOLING TRANSFORMER
DEF DEFROST
DHUM DEHUMIDIFY
SEE
FIGURES FOR
EQUIPMENT
WIRING
24 VAC ZONING
TRANSFORMER
C
RZ
4 ZONE EQUIPMENT CONTROLLER
HUM HUMIDIFY
G FAN
W2 HEAT STAGE 2
W1 HEAT STAGE 1
Y2 COMPRESSOR STAGE 2
Y1 COMPRESSOR STAGE 1
HPTC
LAT
LATC
HPT
OAT
OATC
DAMPERS
8
1
CLS_
COM_
OPN_
=
=
=
CLOSE
COMMON = 24VAC FROM RZ
OPEN
OUTDOOR AIR
TEMP SENSOR
LEAVING AIR
TEMP SENSOR
HEAT PUMP
TEMP SENSOR
CLS3
COM3
OPN3
CLS4
COM4
OPN4
ZONE 3
DAMPER
ZONE 4
DAMPER
CLS1
COM1
OPN1
CLS2
COM2
OPN2
ZONE 1
DAMPER
ZONE 2
DAMPER
G
D
C
NA
P
NA
JUMPER NEEDED
FOR HEAT PUMP
APPLICATIONS
DAMPER
FUSE
3A
OPTION
SWITCHES
NOTE SWITCH
#8 IS AT TOP
D20
(LED)
USER INTERFACE
NOTES:
* = OPTIONAL COMPONENTS
= INSTALLING ZONE 1 REMOTE SENSOR AT OS1 AND OS1C WILL OVERRIDE 
 TEMPERATURE SENSOR ON USER INTERFACE
 = COMMUNICATION BUS ARE IN PARALLEL WITH EACH OTHER
 (EITHER CONNECTOR CAN BE USED)
DEFROST
WIRELESS
RECEIVER*
†
†
V+
RS+
RS-
VG
REMOTE
SENSORS
COMMUNICATION
BUS
ZONE 3
SENSOR
ZONE 4
SENSOR
OPTIONAL
ZONE 1
SENSOR
ZONE 2
SENSOR
V+
COMMUNICATION
BUS
RS+
RS-
VG
OS1
OS1C
ZS2
ZS2C
ZS3
ZS3C
ZS4
ZS4C
V+
RS+
RS-
VG
VG
V+
SMART SENSORS*
RS+
RS-
WHITE
RED
BLUE/YELLOW
GREEN
WHITE
RED
BLUE/YELLOW
GREEN
†
†
†
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