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Electrical system
10.5 Electrical connection of the wiring harness
Danger of fire
Oxidation in the cable can lead to hazardous circumstances.
If the connectors are not of water-tight design, this will invalidate
the warranty for the heater.
The heater has water-tight connectors. All electrical connections must be de-
signed to be water-tight. Unprotected connectors on the wiring harness such
as fuses, relays and diagnostic links must be installed in the dry zone.
10.6 Setting the control temperatures for the heater
If the signal "Motor on"/"Motor off" (terminal D+) is applied to contact 7 of
control unit connector X8, different control thresholds are effective.
Setpoint tempera-
ture at the sensor
"Motor on" 65°C
"Motor off" 80°C
If the signal terminal D+ is not applied, the temperatures correspond to those
for "Motor off".
The normal shutdown pause temperature selected for the heater
should be below the opening temperature of the radiator ther-
mostat.
52
Control
Switching back on follo-
pause
wing a control pause
75°C
60°C
90°C
75°C
(High altitude: 60 °C)
11 Wiring diagrams
The wiring diagrams show the possible connections for 12 or 24 volt heaters.
System wiring diagrams for Thermo Pro 90 and control element:
Figure
Wiring diagram
17
SmartControl/MultiControl (and battery disconnector)
in W-bus mode
18
Smart- / MultiControl analogue
19
UniControl
20
ThermoCall TC4
21
SmartControl (ADR)
22
On/off switch (ADR)
Legend for system wiring diagrams: see paragraphs 11.1, 11.2, 11.3 and 11.4.
Pin allocation on the control unit: see Fig. 13.
Positioning of electrical component on the heater: see Fig. 14.
Legend for Fig. 14:
ATS:
Exhaust gas temperature sensor
BM:
Burner motor
GS:
Glow plug
SG:
Control unit
ÜHS:
Overheat sensor
WTS:
Coolant temperature sensor
Thermo Pro 90
Page
8
9
10
11
12
13
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