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DEFROST
JUMPER NEEDED
FOR HEAT PUMP
APPLICATIONS
SEE
FIGURES FOR
EQUIPMENT
WIRING
24 VAC ZONING
TRANSFORMER
ZONE 1
DAMPER
ZONE 2
DAMPER
ZONE 3
DAMPER
ZONE 4
DAMPER
8
1
NOTES:
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 ZONE EQUIPMENT CONTROLLER
DEF DEFROST
DAMPER
DHUM DEHUMIDIFY
FUSE
HUM HUMIDIFY
O REVERSING VALVE COOL
B REVERSING VALVE HEAT
RH HEATING TRANSFORMER
RC COOLING TRANSFORMER
G FAN
W2 HEAT STAGE 2
W1 HEAT STAGE 1
Y2 COMPRESSOR STAGE 2
Y1 COMPRESSOR STAGE 1
D20
C
(LED)
RZ
CLS1
COM1
OPN1
CLS2
DAMPERS
COM2
CLS_
=
CLOSE
OPN2
COM_
=
COMMON = 24VAC FROM RZ
CLS3
OPN_
=
OPEN
COM3
OPN3
CLS4
COM4
OPN4
OPTION
SWITCHES
NOTE SWITCH
#8 IS AT TOP
*
= 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)
Fig. 10—4-Zone System Wiring Diagram
3A
OAT
OATC
LAT
LATC
HPT
HPTC
†
COMMUNICATION
RS+
BUS
RS-
†
COMMUNICATION
RS+
RS-
BUS
OS1
OS1C
ZS2
ZS2C
REMOTE
SENSORS
ZS3
ZS3C
ZS4
ZS4C
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
7
P
NA
WIRELESS
D
RECEIVER*
C
NA
G
OUTDOOR AIR
TEMP SENSOR
LEAVING AIR
TEMP SENSOR
HEAT PUMP
TEMP SENSOR
USER INTERFACE
V+
RED
BLUE/YELLOW
GREEN
WHITE
VG
SMART SENSORS*
V+
RED
BLUE/YELLOW
GREEN
WHITE
VG
OPTIONAL
ZONE 1
†
SENSOR
ZONE 2
SENSOR
ZONE 3
SENSOR
ZONE 4
SENSOR
V+
RS+
RS-
VG
V+
RS+
RS-
VG
A98083
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