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Page 18
MANUAL
RESET
HI-LIMIT
VENT DAMPER
JUMPER
VENT DAMPER
PLUG
6
3
ALTERNATE WIRING FOR INDOOR INSTALLATION ONLY
Figure 27. Typical example of wiring schematic, System 12, Sizes 175-250.
IGNITION SYSTEM NO. 12 (SIZES 175-250)
ON/OFF WITH EM2
2 AMP
TRANSFORMER
FUSE
R
R
FUSIBLE
LINK
W
W
TERMINAL
STRIP
TEMP
CONTROL
1
R
2
3
4
R
5
6
7
8
9
VENT DAMPER
10
RECEPTACLE
11
W
4
6
5
Y
R
W
12
3
2
1
P
O
VENT DAMPER
AND DRAFTHOOD
SWITCH, M. RESET
VENT DAMPER
ACTUATOR
BK
4
BK
G
5
M
W
BK
2
1
R
BK
24V
115V
P 1
W
Y
PUMP
W
RELAY
A 1
R
T
3
B
FIELD INTERLOCK
(REMOVE JUMPER
WHEN USED)
BR
BR
BR
Y
PV
MV/PV
GAS VALVE
TH-TR
TR
BR
ALTERNATE
GAS VALVE
BRADFORD WHITE
BR
2
3
4 5
LOW WATER
CUT-OFF (OPTIONAL)
POWER
SWITCH
BK
BK
BL
W
PUMP
BR
BR
BK
IGNITION
FLOW
CONTROL
SWITCH
BR
1 MV
Y
2 MV/PV
O
3 PV
4 GND
5 24V (GND)
6 24V
7 TH-W
8 MV
9 SPARK
Y
O
Y
MV
BK - BLACK
W - WHITE
R
Y
BL - BLUE
O
BR - BROWN
O
Y
G
P
TH
FACTORY WIRING
FIELD WIRING
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).
HOT
BK
115/60HZ
POWER SUPPLY
W
NEUTRAL
GROUNDING
CONDUCTOR
PILOT BURNER
WITH SPARK
ELECTRODE
SENSOR
- RED
- YELLOW
- ORANGE
- GREEN
- PURPLE
24V
115V
24V
115V
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