300 mm
5
SERVICE INFORMATION
20
REVISION LEVEL A - 09/09/15
CONTROL VALUES
MOTOR SPEED
Test speed for the blower heater
AIRTRONIC
D2 / D2 Camper
12 volt heater 5000 rpm ±25 % at U = 10.0 volt
AIRTRONIC
D2
24 volt heater 5000 rpm ±25 % at U = 18.0 volt
AIRTRONIC
M B4 / D4 / D3 Camper / D4 Camper
12 volt heater 4400 rpm ±25 % at U = 10.0 volt
AIRTRONIC
M D4
24 volt heater 4400 rpm ±25 % at U = 18.5 volt
AIRTRONIC
M D4S / D4 Camper plus
12 volt heater 4400 rpm ±25 % at U = 10.5 volt
AIRTRONIC
M D4S
24 volt heater 4400 rpm ±25 % at U = 19.0 volt
CONTROL STAGE D2 D4
• Power
• Fast
• Medium
• Slow
• Adjustment
- in circulation mode with temperature sensor, internal
- In fresh air mode with temperature sensor, external
• Ventilation
RESISTANCE VALUES
SWITCH VALUE
COMPONENT
Overheating sensor
EXHAUST VALUE
CO
2
in exhaust in control stage “high”
Soot number as per Bacharach
AIRTRONIC AIRTRONIC
D2 D4
4800 U/min ± 140 rpm 4400 U/min ± 130 rpm
4000 U/min ± 120 rpm 3500 U/min ± 100 rpm
2800 U/min ± 80 rpm 2600 U/min ± 80 rpm
2000 U/min ± 60 rpm 1600 U/min ± 50 rpm
600 U/min ± 20 rpm 600 U/min ± 20 rpm
0 rpm 0 rpm
4800 U/min ± 140 rpm 4400 U/min ± 100 rpm
AIRTRONIC
D2 / D4
140°C - 170°C
(284°F - 338°F)
measured in the control
stage “power” and at a
clearance of 300 mm
from the hot air outlet
Figure 21
AIRTRONIC
D2 / D4
7.5 -12.5 Vol. %
<4
RESISTANCE VALUES
COMPONENT
AIRTRONIC
D2- 12V
AIRTRONIC
D2- 24V Overheat ~60KOhm at room temp
Glow pin 0.42 - 0.7 Ω 1.2 - 2.0 Ω Flame sensor ~1.0KOhm at room temp
Fuel metering pump 9.5 ± 0.5 Ω 36 ± 1.8 Ω
Operator control unit
Set value potentiometer 1750 - 2180 ± 80 Ω 1750 - 2180 ± 80 Ω
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