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DIAGRAMS
SFC COMBI BOILERS SFC-99, SFC-125
95,0 mm
6.2 WIRING DIAGRAMS
SFC series Schematic Wiring Diagram
Flue Sensor
Heat ex. Sensor
Space Heating
Presure Sensor
DHW Hot NTC
CH Supply NTC
DHW Flow Sensor
Gasvalve
Aquastat or
DHW Sensor
BMM
Outdoor Sensor
Thermostat
(by others)
X15
X9
X14
Control Module
SFC series Ladder Wiring Diagram
Power Plug
Ignition
120V
Options
W
BK
R
O G/Y
GY BK
2
2
1
1
5
5
4 4
3
3
2
2
1
1
X9
X8
X5
X4
Control Module
Space Heating
Pressure Sensor
DHW Flow Sensor
DHW Hot Sensor
CH Supply NTC
Heat ex. Sensor
Flue Sensor
BMM
Gasvalve
BR
BL
O
BL
R
R
5
4
3
Y
G W
V
GY
BK
GY BK
GY
X14
17
16
15
13
11 10 9
8
7 6 5 4
3
2
1
X15
Low Voltage
Notes:
- Original wiring as supplied with the appliance must be replaced with type T wire or
its equivalent.
- The wiring for the 120V field connections to the appliance shall have a minimum
size of 14 AWG and a temperature rating of at least 194 °F (90°C).
Wire Color Code Key:
BK - Black
BL - Blue
V - Violet
GY - Gray
W - White
R - Red
Y - Yellow
G - Green
O- Orange
BR - Brown
860004.01
Diagram 6.2-1: Pictorial wiring diagram
Ignition
Power Plug
120V
Boiler
Pump
Blower
Motor
X8
X4
X2
X1
X5
X3
Boiler
Blower
Pump
Motor
R
O
BK
G/Y
GY
BL
R
O
BK
3
3
2
2
1
1
6
6
5
5
4
4
3
3
2
2
1
1
X3
X2
X1
High Voltage
Aquastat or
DWH Senor
Outdoor Sensor
Thermostat
(by others)
2
1
Control Module
6-5
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