Electrical connections
DBW 160/230/300/350
76
Item Description
Remarks
A B C D
1
Heater
Insulated return
2
Control module
SG 1553
z
4
Electronic ignition unit
z
5
Thermostat
Control thermostat
{
8
Thermostat
Overheat thermostatt
{
10
Ignition electrodes
z
12
Thermostat
Control thermostat (ext.)
{
61.3 Supressor (2x)
Radio supression
{
F1
Overheat fuse
polarity independent
z
F2
Fuse 16A
Vehicle fuse DIN 72581
{
F3
Fuse 8A
Vehicle fuse DIN 72581
{
H1
Light, green
Operation indication
z
H2
Light,
circulating pump
If switched by S4
{
K1
Relay
Circulating pump; neg. ter-
minal of heater
K2
Relay
Heater motor
K3
Relay
Light, thermostat operation
control
K4
Relay
Electronic Ignition unit
K5
Relay
Solenoid valve, flame sen-
sor
M1
Motor
Circulating pump
z
M2
Motor
Combustion air fan
z
R
Flame sensor
Photoresistor, polarity inde-
pendent
z
S1
Switch
Heater on/off
z
S3
Switch at water valve
Contact open, when water
valve is closed
{
S4
Switch
for on/offF,
Circulating pump separate
{
X1
Plug connection, 2-pin
{
Y1
Solenoid valve
Polarity independent
z
A
installed in the heater
B
supplied loose
C
only if required
D
provided in vehicle
z
included in standard kit
{
may be supplied depending on model
Item Description
Remarks
A B C D
Legend DBW 230/300/350
