
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5
4
Blower
L1
Neutral
PE
PWM Signal
Speed f-back
Dgnd
Blower
Speed
2 White / Orange
4 White / Blue 5 White / Green
1 Black 2 White 3 Green
Blower Power
Power
Supply J1
2 White
3 Black
Power
Supply J2
Power
Supply
1 Blue
3 Orange
4 White/Green
2 White/Blue
4 White/Orange
5 White/Green
CCB J5
Blower Logic
PWM Signal
Speed f-back
Dgnd
No factory
connections
CCB J17
Low Voltage Field
Central Control Board
(CCB)
Neutral
Line to Spark
CCB J6
Power Out
1 Blue
2 Brown
1 Brown
2 White/Blue
4 Blue
5 Orange
6 White/Green
CCB J16
Low Voltage In
24VAC
24VAC
12VDC
5VDC
Dgnd
1 Red
2 Black
CCB J9
Upper Probe
ECO
Thermistor
4 Red
3 Black
ECO
Thermistor
1 Black
2 Black
CCB J10
Lower Probe
Thermistor Thermistor
2
Inlet return
Outlet return / Inlet power
Outlet power
1 White
2 Red
CCB J15
Pressure
Switches
4 Green
Neutral
L1
9 White
CCB J1
HIGH Voltage In
8 Black
1 Blue
3 Yellow
4 Orange
5 Violet
CCB J3
+5V
Data +
Data -
D gnd
SDA (data)
SCL (data)
Write protect
+5V
Dgnd
CCB J12
2 Red
3 Green
4 White/Brown
5 White/Blue
6 White/Orange
Key
Gas Valve
L1
Neutral
Protective
Earth
MAIN INPUT
3 CIRCUIT BARRIER
TERMINAL BLOCK
Metal Oxide Varistors
White
Black
Green
GROUND SCREW
CCB J14
Limit String
1 Blue
2 Green
3 Yellow
4 Black
6 Black
8 Black
9 Red
10 Brown
11 Violet
12 Gray
Anode
Dgnd
Flame Rod
Condensate
Gas V Switch
Gas V 24V
24V Rtn
Condensate
Gas PS
Gas V Switch
Yellow
Flame
Rod
Spark
Module
Switched L1
Neutral
1 Brown 2 Blue
3 Green
Ground
Red
Black
Red
Black
Upper Temperature
Probe / ECO
Spark
Rod
Black
Black
Lower
Temperature
Probe
Outlet Pressure
Switch
Inlet Pressure
Switch
Enable/Disable
Transformer
Secondary
White / Red
White / Blue
Transformer
Primary
Black
White
Transformer
1 Blue
3 Yellow
4 Orange
Display J1
5 Violet
+5V
Data +
Data -
D gnd
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND
DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
Figure 49: WIRING SCHEMATIC (All Models)
WIRING DIAGRAM