Webasto Thermo 90 Workshop Manual

7 Circuit Diagrams Thermo 90
702
Fig. 702 Circuit Diagram Automatic Control for Thermo 90, 12 and 24 V with Triple Timer
ϑϑ
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
For fuel heaters remove this connection
Temperature coding (temperature at water outlet):
see table page 302
Timer P:
with plus at connection 4 = permanent operation in immediate heating
without plus at connection 4 = heating period 1 hour
1
2
3
Item Nomenclature Remark
A1 Heater Thermo 90
A2 Control Unit SG 1569
B1 Flame Sensor
B2 Temperature Sensor
B3 Temperature Limiter
B4 Room Thermostat
E Glow Plug
F1 Fuse 20 A Flat Fuse SAE J 1284
F2 Fuse 5 A Flat Fuse SAE J 1284
F3 Fuse 20 A Flat Fuse SAE J 1284
H1 Symbol for “Heating” in Display Operation indication (in item P)
H3 Light Symbol illumination (in item P)
H4 LED max. 20 mA Flame indication (option)
K1 Relay (in item A2) Master relay
K2 Relay (in item A2) for circulation pump
K5 Relay for vehicle blower
K6 Relay only required for battery switch
in minus
Item Nomenclature Remark
M1 Motor Combustion air fan
M2 Motor Circulation pump
M3 Motor Vehicle blower
P1 Test Unit for diagnosis
P Timer 1529 for pre-timed operation
R Resistor Resistor for H4
S1 Switch for Circulation Pump for separate switch-on
S2 Switch Battery switch in plus
S3 Switch Battery switch in minus
V106 Transistor in item A2
V107 Transistor in item A2
V108 Transistor in item A2
X1 Connection 12-pole on item A1
X2 Connection 8-pole on item P
X4 Connection 2-pole
Y Dosing Pump

Webasto Thermo 90 Specifications

General

Brand	Webasto
Model	Thermo 90
Category	Water Heater
Language	English