Webasto Thermo 90, Workshop Manual

Page: 29 / 53

Thermo 90 7 Circuit Diagrams
703
Fig. 703 Circuit Diagram Automatic Control Thermo 90-TRS, 24 V
ϑ ϑ
For fuel heaters remove this connection
Temperature coding (temperature at water outlet):
see table page 302
Switch S6 must be installed so that plus or minus potential is applied to the
relevant control inputs of the control unit when a conveyor facility is put into
operation.
1
2
3
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
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
H2 Light in item S4 Operation indication (max. 2 W)
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
M1 Motor Combustion air fan
M2 Motor Circulation pump
M3 Motor Vehicle blower
Item Nomenclature Remark
P1 Test Unit for diagnosis
R Resistor Resistor for H4
S1 Switch for Circulation Pump for separate switch-on
S4 Switch ON / OFF
S5 Isolation Switch 1-pole or 2-pole Emergency off switch electr. or pneum.
S6 Switch on Conveyor Facility to plus or minus
V106 Transistor in item A2
V107 Transistor in item A2
V108 Transistor in item A2
X1 Connection 12-pole on item A1
X4 Connection 2-pole
Y Dosing Pump