Electrical installation
Installation and maintenance instructions ecoTEC plus 0020116700_01 33
8
Circulation pump remote control
1
DCF connection
Earth
Earth
External temperature sensor
Flow sensor (optional)
6
Internal pump *
Pump PWM signal
Ignition
electrode
Ignition
unit
Bus connection
(Controller/room th. digital)
Auxiliary relay *
(Selection by D.026)
+ 24 V
PWM
Earth
Hall signal
L
N
M
+
X25
7
8
5
3
11
10
+
2
1
9
6
12
X2
8
17
7
18
14
13
11
4
12
16
5
7
7
16
4
3
17
24 V
230 V~
Mains connection
X51
Appliance earth
1
3
17
4
X22
8
15
13
12
2
X20
X24
X41
X100
X16
X11
X18
X1
* ... variant-dependent
230 V AC room thermostat *
No function *
Fan
Diverter
valve *
Stepper motor
Gas valve
5
1
6
Holding magnet
+
-
1
3
4
white
Cylinder contact "C1-C2"
Cylinder sensor (optional)
white
red
Flow sensor
blue
Return sensor
Display
Connection
Safety fuse
Coding resistor, output range
Coding resistor, gas group
2
3
4
Burner
off
RT
24
Bus
Water pressure
sensor
Mass flow
sensor
Contact thermostat/burner off
1
2
3
4
5
6
12
45
L
N
L
N
N
N
+
-
FB
AF
RF
DCF
0
0
RT
L
L
24 V DC room thermostat
blue
pink
white
Edge
connector
white
blue
pink
grey
blue
green
turquoise
white
8.4 Connection diagram for electronics box ecoTEC plus 637
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