Manual 2100-752B
Page
24 of 49
FIGURE 22
Thermostat Connections
CO2 OUT
Optional CO2 Controller
Bard Part #8403-096
6
5
4
3
2
1
TEMP-OUT
24VAC
W3
6
5
4
2
1
R
Unit Low
Voltage
Term. Strip
W2
C
G
RT
Y1
Y2
B/W1
L
D
A
3
Factory installed jumper. Remove jumper to activate Balanced Climate
™
Mode.
A 2-stage thermostat is recommended for Balanced Climate mode.
9
5 Do not add these wires if setting up for modulating control. See note 6.
Jumper needs added.
7
2B Install Jumper for 1 stage electric heat on units with more
than 10KW.
0-10 VDC Modulating CO2 control signal for modulating ventilation control
(Optional for ECON Only) - See vent installation manual.
6
For vent operation, add jumper if optional CO2 controller is not used.
Vent will run while blower is energized.
For ECON & CRV-V an additional wire change is required
See install Manual.
4
Factory installed jumper. Remove jumper and connect
to N.C fire alarm circuit if emergency shutdown required.
3
Wire not needed below 15KW.
2A
Wire required for dehumidification models only.
1
Thermostat will not work with units equipped with economizers.
8
6
10
12
11
9
4
12-Pin
Vent Plug
2
3
5
7
T4 Pro 8403-089
ALL VENT OPTIONS PLUG IN HERE
6
4
2A
3
W
Rc
C
R
G
Y
W2
4
3
5
Electronic Humidistat
8
Mechanical Humidistat
8403-038
Units With Dehumidification
8403-047
8403-092
Y2
W
C
Rc
Y
R
G
O
B
7
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
T6 Pro 8403-090
1
6
2B
5
9
MIS-3975 D
