Webasto Thermo 90 Workshop Manual

7 Circuit Diagrams Thermo 90
704
Fig. 704 Circuit Diagram Automatic Control for Thermo 90 S, 12 and 24 V with Standard Timer
ϑϑ
Temperature coding (temperature at water outlet):
see table page 302
Timer P2:
with plus at connection 10 = permanent operation in instant heating
without plus at connection 10 = heating period programmable
= (10 min to 120 min);
= basic setting 120 min
2
4
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 / Thermo 90 S
A2 Control Unit
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 P1 or P2)
H3 Light Symbol illumination (in item P1 or P2)
H6 LED red (in item P2) Illumination instant heat switch,
standby indication, on indication
K5 Relay for vehicle blower
M1 Motor Combustion air fan
M2 Motor Circulation pump
M3 Motor Vehicle blower
Item Nomenclature Remark
P2 Standard Timer (1531) for pre-timed operation
S8 Switch Button Instant heat switch remote control
X1 Connection 12-pole on item A1
X3 Connection 12-pole on item P2
X5 Connection 12
-pole
X6 Connection 12
-pole Diagnosis
X11 Connection 12-pole on item A2 (ST 1)
X12 Connection 12-pole on item A2 (ST 2)
X13 Connection 12
-pole on item A2 (ST 3)
Y1 Dosing Pump

Webasto Thermo 90 Specifications

General

Brand	Webasto
Model	Thermo 90
Category	Water Heater
Language	English