Manual 2100-689
Page
16 of 32
FIGURE 9
Thermostat Connections
CO2 OUT
Optional CO2 Controller
Bard Part #8403-067
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
5 Do not add these wires if setting up for modulating control. See note 7.
7 For 8403-058, change "system type", set up Function 1, From 5 (2 Heat/ 1 Cool heat Pump)
to 6 (2 Heat / 2 Cool Conventional). For 8403-059, No change required.
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.
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
8
Jumper needs added.
9
Thermostat will not work with units equipped with economizers.
10
Factory installed jumper. Remove jumper to activate Balanced C
limate
™
Mode
6
10
12
11
9
4
12-Pin
Vent Plug
2
3
5
7
8403-059
Mechanical Humidistat
R
Y
2A
8403-057
9
6
(TH311OD1040)
ALL VENT OPTIONS PLUG IN HERE
W
Rc
C
R
G
Y
Y2
W2
6
4
3
5
4
7
B
W
C
Rc
8
2B
1
or T4 Pro 8403-089
Electronic Humidistat
G
3
8403-038
O
Units With Dehumidification
8403-047
or T6 Pro 8403-090
(TH522OD1219/U)
8403-058
(TH522OD1151)
MIS-3975
5
10
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
