Bryant ZONEBB3Z, Installation And Operating Instructions Manual

Page: 5 / 12

If the cooling and heating systems have separate transformers,
twist off the Rc/Rh jumper using a pair of long nosed pliers. Then
connect the R of the cooling transformer to Rc, the R of the heating
transformer to Rh and the common of both transformers to C.
Connect a jumper wire between Rz and Rc. Rc powers G, Y, and
O outputs. Rh powers W outputs.
UNDERSTANDING SYSTEM OPERATION
(READ BEFORE STARTING SYSTEM)
Mode and Damper Positions
The thermostats determine the system heating or cooling mode.
The first call in any zone sets the mode to satisfy that call. It will
remain in that mode until all calls in that mode are satisfied and the
equipment has been off for the time set by the auto changeover
time dipswitches. (See Timers section.)
In normal heating or cooling, the damper of any zone with a call
in the current mode will be open and all other zones will be closed.
When there is no call, any zone with its fan set to ON will be open,
and any zone with its fan set to AUTO will be closed. If any zone
fan is set to ON, the blower will be energized.
If all fan settings are AUTO, the dampers will remain in their last
position before the equipment turned off and the blower will be
off. (This normally means one damper open and all others closed.)
When dampers are to move, all opening is done first, followed by
all closing.
Stages
In multi-stage systems, the equipment stage is set by the greatest
thermostat call, but may be delayed by the control’s cycle and
Fig. 8—AC or 1-Stage System Wiring Diagram
A04192
Rh
Rc
Y1
W1
G
R
C
Y1
W1
G
R
C
Y1
W1
G
R
C
Y1
W1
G
CLS_1
COM_1
OPN_1
CLS _ 2
COM_2
OPN _ 2
CLS _ 3
COM_3
OPN _ 3
C
Rz
LATC
LAT
ON
1 2 3 4 5 6 7
Relay
Relay
Relay
Fuse
Triac
Triac
Triac
Triac
Triac
Triac
Power Supply
Micro
W Y1 G
Damper 1
Damper 2
Damper 3
Compressor
Timer Override
Status
Rc/Rh
Twist Of f
Zone
Zone
Zone
Dipswitches 1- 8
To 24VAC
Power
To Equipment
To Zone 1
Damper
To Zone 2
Damper
To Zone 3
Damper
To LAT
Sensor
To Zon e
Thermostat
To Zon e
Thermostat
To Zone
Thermostat
Programming
Connecto
r
Fig. 9—HP or 2-Stage System Wiring Diagram
A04191
Rh
Rc
Y1
W1
G
Y2
W2
O
R
C
Y1
W1
G
Y2
W2
O
R
C
Y1
W1
G
Y2
W2
O
R
C
Y1
W1
G
Y2
W2
O
CLS_1
COM_1
OPN_1
CLS 2
COM_2
OPN 2
CLS 3
COM_3
OPN 3
C
R
HPT
HP
LATC
LAT
ON
1 2 3 4 5 6 7 1 2 3
ON
Relay
Relay
Relay
Relay
Relay
Relay
Fuse
Triac
Triac
Triac
Triac
Triac
Triac
Power Supply
Micro
W Y1 G W Y2 O
Damper 1
Damper 2
Damper 3
Compressor
Timer Override
E-Heat
Status
E-Heat
Rc/R
Twist Of f
Zone
Zone
Zone
To Zone 1
Thermostat
To Zone 2
Thermostat
To Zone 3
Thermostat
To 24VAC
Power
To
Equipment
To Zone 1
Damper
To Zone 2
Damper
To Zone 3
Damper
To HPT
Sensor
To LAT
Sensor
Dipswitches 1 - 12
Connector
Prog
ramming
—5—