Bard CH Series - Figure 21 Thermostat Connections

Manual 2100-769A
Page 28 of 50
FIGURE 21
Thermostat Connections
CO2 OUT
Optional CO2 Controller
Bard Part #8403-096
6
5
4
3
2
1
TEMP-OUT
24VAC
W3
65421R
Unit Low
Voltage
Term. Strip
W2C GRT Y1 Y2
B/W1
L DA 3
8403-081 or 8403-083 incompatible with Emergency Heat.
5
Do not add these wires if setting up for modulating control. See note 6.
Optional CO2 not required when using 8403-081 and 8403-083.7
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.
Wire not needed below 15KW.
2
1
8
Only use with Electric Heat options 10KW or less.
6
1012
119
4
12-Pin
Vent Plug
23 5 7
4
MIS-4438
ALL VENT OPTIONS PLUG IN HERE
C
AUX
2
O/BRcR G Y Y2
or 8403-092
If not equipped with a ventilation option to plug in, a jumper plug must be installed.
T6 Pro 8403-090
1
E
5
6
7
97 65 4 3 2
8 11 17 1 12
8
Thermostat
#8403-081 or
#8403-083