Technical data

7 Circuit Diagrams Thermo 230 / 231 / 300 / 301 / 350
708
Fig. 707 System Circuit O405 / O407 / O408, Ident.-Nr. 91292
33
51
15
6
2
2
6
1
2
44
4
3
3
2
2
1
1
4
F1
B2
Y1
br gr or gn
ϑ
ϑ
rt/ws
bl
or
br
br
sw
rt
sw
A2
X1
A
X3
D
X2
C
K2
K1
M1
M2
H2H1
B3
B4
S2
S3
S4
S1
A1
B1
E1
U2
U1
SE
-
+
M
M
M1
A2
U1
A1
B1 Y1
F1/B3
E1
B2
F3 F2
30
30
C
W1
W2
-31
-31
D
4
3
2
1
X3
8
7
6
5
4
3
2
1
2
1
X2
X1
1
3
5
2
4
6
A
6
5
4
3
2
1
DEUTSCH
1
Fuse acc. to SAE J 1284 / DIN 72581
DW 300
25A / 16A
DW 230
25A / 16A
DW 350
25A / 16A
25A / 16A25A / 16A 25A / 16A
Item Nomenclature Remark
A1 Heater not grounded
A2 Control unit SG 1572D
B1 Flame sensor observe polarity
B2 Temperature sensor polarity optional
B3 Temperature limiter alternative to F1
B4 Thermostat for nozzle preheating
E1 Heating cartridge for nozzle preheating
F2 Fuse see table
F3 Fuse see table
H1 Light operation indicator light
H2 Light flame indicator
K1 Relay for circulation pump motor
K2 Relay for combustion air fan
M1 Motor combustion air fan
M2 Motor circulation pump
S1 Switch on / off
S2 Continuity switch on water cock
Item Nomenclature Remark
S3 Switch, external trigger
circulation pump
required, if S2 not installed
S4 Switch power save operation
U1 Igniter box
U2 Igniter electrodes
W1 Wiring harness (1)
W2 Wiring harness (2)
A Plug connections, 6-pole
C Plug connections, 1-pole
D Plug connections, 4-pole
X1 Plug connections, 6-pole
X2 Plug connections, 2-pole
X3 Plug connections, 8-pole
Y1 Solenoid valve
1 Diagnostic connector
Wire gauges
< 7,5 m 7,5 - 15 m
0,75 mm
2
1,0 mm
2
1,5 mm
2
2,0 mm
2
4,0 mm
2
1,5 mm
2
1,5 mm
2
2,5 mm
2
? mm
2
6,0 mm
2
2,5 mm
2
4,0 mm
2
bl
br
ge
gn
gr
or
rt
sw
vi
ws
Wire colors
blue
brown
yellow
green
gray
orange
red
black
violet
white