3
24V 40VA Transformer
to Power Dampers
W-O/B
O/B
G
Y
R
C
AIRFLOW
BYPASS
DAMPER
ZONE 3
THERMOSTAT
R Y W G C
ZONE 2
THERMOSTAT
R Y W G C
ZONE 1
THERMOSTAT
R Y W G C
1
1
2
2
3
3
TR1
TR2
R Y O/B W2 G C
R Y W G C
R Y W G C
R
Y
G
W-O/B
W2
C
O O O
LED
Y
O/B W
W2
G
DPR1
DPR2
DPR3
GE
HP
B
POWER
SWITCH
DIGI3U
A/C UNIT TERMINALS
DAMPER OUTPUTS
STAT 2
STAT 3
STAT 1
O
PWR
CONTROL CHIP
O
O
LED
S S
JP1 JP2
W
WIRING – GAS/ELECTRIC DIGI3U
S S – terminals for LAT capacity control. If not applied, leave 1k ohm resistor in place; and field supplied high
and low limits should be added.
Transformer – damper transformer 24vac 40va 2 amp fuse
Damper Terminals
JP1 – not used in Gas/Electric applications
JP2 – configuration jumper for Gas/Electric or Heat Pump operation
Unit Terminals – outputs to furnace and condenser
Thermostats – standard single stage heat/cool thermostats
LAT Sensor location – mount sensor in supply before bypass takeoff
1
1
2
3
4
5
6
7
2
3
4
5
6
7
Follow this diagram for Gas/Electric applications.
