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Page 20
R
MANUAL
W
RESET
HI-LIMIT
TEMP
CONTROL
200°F MAX
R
R
BK - BLACK
W - WHITE
R
- RED
Y
- YELLOW
BL - BLUE
BR - BROWN
O
- ORANGE
G
- GREEN
P
- PURPLE
FACTORY WIRING
24V
115V
FIELD WIRING
24V
115V
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED
WITH THE HEATER MUST BE REPLACED, IT
MUST BE REPLACED WITH APPLIANCE WIRING
MATERIAL 105°C (220°F) OR ITS EQUIVALENT.
WHITE WIRES TO FUSIBLE LINK MUST BE
REPLACED WITH WIRE HAVING INSULATION
RATED AT 200°C (390°F). (AVAILABLE FROM
FACTORY).
Figure 29. Typical example of wiring schematic, System 12, Sizes 325-400.
IGNITION SYSTEM NO. 12 (SIZES 325-400)
ON/OFF WITH EM2
2 AMP
TRANSFORMER
FUSE
R
115V
24V
Y
Y
TERMINAL
STRIP
R
1
2
3
FIELD INTERLOCK
(REMOVE JUMPER
4
WHEN USED)
5
6
7
8
9
10
11
12
Y
BK
BR
P
1
2
3
4
5
W
BK
PUMP
W
RELAY
BR
1
A
R
O
T
3
Y
B
R
FLOW
SWITCH
BR
BR
TH-TR
TR
BR
TH
GAS VALVE
BRADFORD WHITE
LOW WATER
CUT-OFF (OPTIONAL)
POWER
SWITCH
BK
BL
115V/60HZ
POWER SUPPLY
W
PUMP
BR
BR
BK
IGNITION
CONTROL
BR
1 MV
Y
2 MV/PV
O
3 PV
4 GND
5 24V (GND)
6 24V
7 TH-W
8 MV
9 SPARK
PILOT BURNER
WITH SPARK
ELECTRODE
SENSOR
Y
O
Y
HOT
BK
W
NEUTRAL
GROUNDING
CONDUCTOR
G
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