Legend For Circuit Diagrams - Webasto Air Top Evo 3900 Workshop Manual

7 Circuit diagrams
7.2

Legend for circuit diagrams

1. With positive from terminal (15/75) to connection 10:
Permanent operation for immediate heat as long as
the ignition is switched on
Without positive at connection 10:
Heating time is variably programmable
(10 min to 120 min), default setting 120 min
2. Connection for Telestart*/Thermocall*/
W-bus diagnosis
(* only when using Control Panel MC04/05)
3. CO adjustment (see workshop manual)
2
4. NOTE:
If the connection is made to terminal 30, permanent
heating is possible when the ignition is switched off!
In this case no connection must be made to
terminal 15/75.
5. NOTE:
Grey and violet cables required for ADR function
6. External temperature sensor
7. Fuse installed in vehicle
8. PIN 7 "BOOST" only with boost heaters
Cable cross-sections
< 7.5 m
2
0.75 mm
2
1.0 mm
2
1.5 mm
2
2.5 mm
2
4.0 mm
Cable colours
bl blue
br brown
ge yellow
gn green
gr grey
or orange
rt red
sw black
vi violet
ws white
706
7.5 - 15 m
2
1.0 mm
2
1.5 mm
2
2.5 mm
2
4.0 mm
2
6.0 mm
Air Top Evo 3900/5500
Item Description
A1 Heater
A2 Control module
B2 Temperature sensor
B3 Overheating sensor
B4 Temperature sensor
E Glow plug / Flame monitor
F1 Fuse 24 V 15A/12V 20A
F2 Fuse 20 A
F4 Fuse 1A
F3 Fuse max. 15A
H1 Green LED
H3 LED red (in item P)
H4 Heating symbol in the display
(in item P)
H5 Lights
H6 Light (at least 1.2 W)
K Relay
with free-wheeling diode
M1 Motor
M3 Motor
P Combination timer (1531)
Resistor 620 Ω
R1
S Control Panel MC04/05
S1 Control element
S2 1 or 2-pin disconnecting
switch
S3 Switch
S5 Switch
S6 Switch
S7 Momentary-contact switch
S8 Battery isolation switch
V1 Diode
V12 Diode
X1 Plug connector, 2-pin
X2 Plug connector, 2-pin
X3 Plug connector, 2-pin
X4 Plug connector, 2-pin
X5 Plug connector, 2-pin
X6 Plug connector, 2-pin
X7 12-pin plug connection
X8 Plug connector, 1-pin
X9 Plug connector, 4-pin
X10 Plug connector, 2-pin
X11 Plug connector, 2-pin
X12 12-pin plug connection
Y1 Metering pump
Y2 Solenoid valve
Comment
Air Top Evo 3900/5500
In control unit
Overheating guard
External
Flat fuse SAE J 1284
Flat fuse SAE J 1284
Flat fuse SAE J 1284
Flat fuse SAE J 1284
Indicator
Light in immediate heat button,
ready indicator,
Switch-on indicator
Indicator
Display or button illumination
Switch-on indicator pumping
device
for vehicle fan
Combustion and hot air fan
Vehicle fan
Timer and setpoint generator
With internal temperature
sensor only
Setpoint generator and selector
switch for additional functions
Setpoint generator switch
Emergency Stop switch
On and for pumping device
CO setting
2
Boost - only with boost heaters
Immediate heat button remote
control
To item A2 (ST B)
To item A2 (ST V)
To item A2 (ST U)
To item A2 (ST Z)
To item A2 (ST Y)
To item A2 (ST X)
To item A2 (ST 1)
to item S1
to item Y1
to item P
for pumping device