44
Servicing should only be performed by a Qualified Service Agent
wiring diagram
2
GREEN
WHITE
RED
BLACK
1
1
2
BLACK
3
WHITE
COMBUSTION
BLOWER
TEMPERATURE PROBE
1 RED (ECO)
4 RED (ECO)
2 BLACK
3 BLACK
1 BLACK120 VAC HOT
3 WHITE 120 VAC NEUTRAL
4 YEL 24 VAC
4 YEL 24 VAC
HOT SURFACE IGNITER
FLAME SENSOR
BLOCKED
INTAKE AIR
BLOCKED
EXHAUST
BLOWER
PROVER
24 VOLT
GAS VALVE
B (CENTRAL CONTROL BOARD)
C
C
6J5
J4
J7
J5
1J
61
J
01
J3
1J2
J3
J1
J
TRANSFORMER
INSIDE CCB
ENCLOSURE
50VA
GROUND STRIP
BURNER GROUND
(BURNER BOLT)
ON/OFF
SWITCH
GROUND
120 VAC NEUTRAL
120 VAC HOT
1 BLACK
2 WHITE
RED
1 BLACK
2 WHITE
M
USER INTERFACE MODULE
I
U
2
15
4
14
5
10
6
7
8
11
L
N
1 4 5
3 WHITE/GREEN
7 WHITE/BLUE
8 WHITE/BROWN
2 RED
GREEN
WHITE
N
OI
T
C
N
UJ
X
O
B
N
E
E
R
G
N
E
E
R
G
ENABLE/DISABLE CIRCUIT
JUMPER WIRE BETWEEN PINS
8 AND 11 ON J6 PLUG
NOTE: COMBUSTION BLOWER
ASSEMBLY CONSISTS OF
MOTOR, BLOWER AND INTEGRAL
BLOWER SPEED CONTROL.
PWM (Pulse Width Modulation)
SPEED INSTRUCTION SIGNAL
WIRES FROM CCB TO BLOWER
SPEED CONTROL
120 VAC 1 Ø POWER
Figure 42
Service Notes:
This water heater is polarity and ground sensitive. The Control System will lock out and display the
AC
Reversed
fault message if the power supply polarity is reversed. flame sensing current cannot be established
if the Burner is not grounded which will cause
Ignition Failure
fault conditions and Control System lock outs.
See Electrical Requirements on page 6.
