Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
5 Installation
83311002 1/2018-03 La
31-132
5.6.1 Wiring diagram
Observe the instructions for the electrical installation [ch. 5.6].
The maximum total current from all external loads must not exceed 4.5 A.
S1
T6,3 H
µC - Unit
230 V/50 Hz
L N PE
D
A
D
D
AC
DC
230V
L N
230V
L N
M1
L N
MFA1
L N
MFA2
L N
H1
L E
H2
L E
VA1
1 2
B1
1 M
B3
1 M
B10
1 M
B11
1 M
B12
1 M
eBUS
+
1 M
WCM - OB - CPU
230 V
H2
H1
M1
MFA1
MFA2
N
L
B3
B1
B11
B10
WCM-EM
WCM-FS
eBUS
Modul
4 ... 20 mA
16A
Plug
Colour
Connection
Description
230V
↑
black
Voltage supply 230 V AC / 50 Hz
–
230V
↓
grey
Voltage output 230 V AC
max 3 A (AC1)
M1
white
Anti syphon valve / booster pump
Relay output 230 V AC
max 3 A (AC1)
H1
turquoise
Input 230 V AC
–
H2
red
Input 230 V AC
–
MFA1
purple
Relay output 230 V AC
max 3 A (AC1)
MFA2
purple
Relay output 230 V AC
max 3 A (AC1)
VA1
orange
Potential free relay output
230 V AC/max 3 A (AC1)
B1
Green
External sensor
NTC 600 Ω
Temperature remote control 4 … 20 mA
B3
yellow
DHW sensor
NTC 12 kΩ
B10
white
Buffer sensor top
NTC 5 kΩ
B11
white
Buffer sensor bottom/ de-couple sensor
NTC 5 kΩ
B12
white
Reserve (not used)
–
dark blue
Reserve (not used)
–
eBUS
light blue
WCM components (FS, EM, SOL, COM)
–