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4. Installation
4.11 Electrical Diagram
X1
X2
1 2 3 4
1
2
3
GN
GN
WH
BK
S
N
L
P
120V, 60Hz
2
14
1
3
4
9
10
BK
BK
BL
RD
BK
4 3
1
1
X118
X114
X115
1
2
2
2
FGTS
RTS
FTS
P
Main supply
SCU
Extended control PCB
S
ON/OFF switch
FAN Fan
IT
Ignition transformer
E
Ignition power relay
MCA-Pro ISM Rv.4.1 2/2017
X3
X4
4
5
3 2 1
1 2 3
GN
BR
BK
BL
BK
BR
GN/
YW
3 1
3 1 2
4 2
X51
X41
FAN
X10
11
12
5
6
8
7
13
15
BK
BK
BK
BK
BK
BK
BK
BK
3 1
1 2
1 2 3 4
X112
X116
X111
PWM
PSU
PUMP
2
PS
GB
Combined Venturi and gas valve unit
PUMP A Boiler pump
HLS
Safety themostat
RTS
Return sensor
FTS
Flow sensor
PS
Pressure sensor
FGTS
Flue gas temperature sensor
X5
2 3 4 1
GY
BK
WH
WH
GN
3
1 2
X51
IT
E
X11
1 2 3 4 5 6
1 2
3 4 5 6
OR
YW
WH
RD
GY
GN
OT
X1
SCU
SCU
MCA Pro 45/65/90/115
X6
X8
1 2 3
1 2 3
GN
GN
RD
BK
WH
WH
2 1 3
X81
3
5
1
3 1 2
X21
GB
PUMP A
X12
7 8
9 1 0
OS
WS
X3
X2 X4
X5
X6
X7
X8
X9
X10
X14
X13 X12
PSU
Storage parameter
OT
Thermostat
OS
Outdoor Temp. Sensor
WS
DHW sensor
PC
Connection Computer
DIS
Display
X9
1
2 3 4 5
BK
BK
BK
BK
BK
BK
1
1 2 4 5
X117
X91
FAN
2
HLS
X13
X14
1
1 10
1 10
PC
DIS
X11
63
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