Valeo spheros thermo 230, Workshop Manual

Page: 35 / 71

703
Thermo 230 / 231 / 300 / 301 / 350 7 Circuit Diagrams
Fig. 702: Automatic Control Circuit with Control Unit 1572 and Timer (Triple Timer)
Item Nomenclature Remark
A1 Heater not grounded
A2 Control unit SG 1572
B1 Flame sensor
B2 Temperature sensor
B3 Temperature limiter
B4 Thermostat open at T > 8 °C
E1 Heating cartridge for nozzle preheating
F2 Fuse 25A flat fuse SAE J 1284
F3 Fuse 25A flat fuse SAE J 1284
F6 Fuse 5A flat fuse SAE J 1284
H3 Light in pos. P symbol lighting
H4 Symb. “Heating“ on display operation indicator light
K1 Relay (in item A2) for circulation pump
K2 Relay (in item A2) for combustion air fan /
heating cartridge
M1 Motor combustion air fan
M2 Motor circulation pump
P Pre-selection timer (1529) for pre-selection operation
Item Nomenclature Remark
S2 Continuity switch on water cock
S3 Switch,
Ext. pump trigger
S4 Switch power save operation
U1 Igniter box
U2 Igniter electrodes
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
X4 Plug connections, 8-pole
Y1 Solenoid valve
bl
br
ge
gn
gr
or
rt
sw
vi
ws
Wire colors
blue
brown
yellow
green
gray
orange
red
black
violet
white
Wire gauges
< 7,5 m 7,5 - 15 m
0,75 mm
2
1,0 mm
2
1,5 mm
2
2,5 mm
2
4,0 mm
2
1,5 mm
2
1,5 mm
2
2,5 mm
2
4,0 mm
2
6,0 mm
2
X4
7 3 3
5 1
1 5
6 2
2
6
1
2
4 4
3
4
3
3
2
2
1
1
4
2 6 4 8
5
H3
P
H4
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
H2
B3
B4
S2
S3
S4
A1
B1
E1
U2
U1
SE
-
+
M
M
X4
1 2 3 4 5 6 7 8
X3
8
7
6
5
4
3
2
1
2
1
X2
X1
1 3
5
2
4 6
M1
A2
U1
A1
B1 Y1
F1/B3
E1
B2
br br
58
75(15)
58
75(15)
F3 F6 F2
30 30
31 31
D
C
A
6
5
4 3
2
1
1
2
3 4
1 Diagnostic connector
2 to vehicle te75 if available, otherwise terminal 15
3 Timer P:
with plus to connection 4 = continuous operation during immediate heating
without plus to connection 4 = heating period 1 hour
4 vehicle lighting terminal 58