Webasto Air Top 2000 ST B Installation Instructions Manual page 35

Air Top 2000 ST
Item Description
A1 Heater
A2 Control module
B1 Flame sensor
B2 Temperature sensor
B3 Overheating sensor
B4 Temperature sensor
E Glow plug
F1 Fuse 15 A 12 V/24 V
(max. 20 A)
F2 Fuse 4 A
F4 Fuse 4 A
F5 Fuse
H1 LED, green (in item S1)
H2 LED red (in item P)
H3 Heating symbol in the display
(in item P)
H4 Light (in item P and S)
H5 Light bulb/LED
K Relay
with free-wheeling diode
M1 Motor
M3 Motor
Comment
Air Top 2000 ST
Control unit 1574
for petrol heaters only
internal
Overheating guard
External
Flat fuse SAE J 1284
Blade fuse SAE J 1284
not contained in wiring harness
Blade fuse SAE J 1284
not contained in wiring harness
Blade fuse SAE J 1284
Value in [A] to be selected de-
pending on line cross-section
not contained in wiring harness
Indicator
Light in immediate heat button,
ready indicator,
Switch-on indicator
Indicator
Display and button lighting
Switch-on indicator pumping de-
vice
for vehicle fan
(only valid with OE version)
Combustion and hot air fan
Vehicle fan
Legend for circuit diagrams
Item Description
P Combination Timer 1531
R1 Resistor
S1 Basic heater control
S2 Switch
S3 Switch
S4 Push button
S5 Switch
S6 Switch, single or two-pin
S7 Battery isolation switch
X8- Plug connector
X13
X14 Plug connector
X15 Plug connector
Y1 Metering pump
Y2 Solenoid valve/pump
Comment
Timer and setpoint generator
With internal temperature sensor
only
On/Off switch and setpoint gene-
rator
Ventilation
CO setting
2
External instant heat button
Auxiliary drive/Pumping device
Isolation switch
Electronically controlled isolation
switch
to item Y1
to item P
Auxiliary drive/Pumping device
69