Technical data

Air Top 2000 ST Circuit diagrams
705
7.2 Legend for circuit diagrams
Cable cross-sections
< 7.5 m 7.5 - 15 m
0.75 mm
2
1.0 mm
2
1.0 mm
2
1.5 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
4.0 mm
2
4.0 mm
2
6.0 mm
2
Cable colours
bl
br
ge
gn
gr
or
rt
sw
vi
ws
blue
brown
yellow
green
grey
orange
red
black
violet
white
Item Description Comment
A1 Heater Air Top 2000 ST
A2 Control unit Control unit 1574
B1 Flame monitor with petrol heaters only
B2 Temperature sensor Internal
B3 Overheating sensor Overheating guard
B4 Temperature sensor External
E Glow plug
F1 Fuse 15 A 12V/ 24
V (max. 20 A)
Flat fuse SAE J 1284
F2 Fuse 4 A Blade fuse SAE J 1284
not contained in wiring harness
F4 Fuse 4 A Blade fuse SAE J 1284
not contained in wiring harness
F5 Fuse Blade fuse SAE J 1284
Value in [A] to be selected
depending on line cross-
section
not contained in wiring harness
H1 LED, green (in item S1) Indicator
H2 LED red (in item P) Light in immediate heat
button,
ready indicator,
switch-on indicator
H3 Heating symbol in the
display (in item P)
Indicator
H4 Light (in item P and S) Display and button lighting
H5 Light bulb/LED Switch-on indicator pumping
device
Item Description Comment
K Relay
with free-wheeling diode
for vehicle fan
(only valid with OE variant)
M1 Motor Combustion and hot air fan
M3 Motor Vehicle fan
P Control element 1531 Timer and setpoint generator
R1 Resistor With internal temperature
sensor only
S1 Basic heater control On/Off switch and setpoint
generator
S2 Switch Ventilation
S3 Switch CO
2
setting
S4 Push button External instant heat button
S5 Switch Auxiliary drive /Pumping
device
S6 Switch, single or two-pin Isolation switch
S7 Battery isolation switch Electronically controlled
isolation switch
X8-
X13
Plug connector
X14 Plug connector to item Y1
X15 Plug connector to item P
Y1 Metering pump
Y2 Solenoid valve/pump Auxiliary drive /Pumping
device