2 General description Thermo Pro 90
201
2 General description
The Thermo Pro 90 water heater is used in conjunction with
the original vehicle heating system in the parking heating
mode for
– cab and engine preheating,
– utilisation of residual vehicle engine heat.
The auxiliary heating mode can also be operated with the
vehicle engine running.
Depending on the equipment, the ADR function is intended
for the 12 V and 24 V variant.
The water heater operates independently of the vehicle
engine and is connected to the cooling system, the fuel sys-
tem and the electrical system of the vehicle.
The heater runs in controlled intermittent operation accord-
ing to the coolant temperature.
Depending on the deviation of the current coolant temper-
ature from the set-point temperature at the coolant temper-
ature sensor, the burner output is controlled within a range
of 1.8 to 7.6 kW. In case of a particularly high heating
capacity requirement (preheating), the maximum output of
9.1 kW is available for 2 hours when the unit is switched on.
The Thermo Pro 90 heater mainly consists of the following
components:
– Combustion air fan
– Heat exchanger
– Burner unit
– Circulation pump
The following components are arranged in the heater for
control and monitoring:
– Control unit
– Exhaust temperature sensor
– Glow plug
– Coolant temperature sensor
– Overheating protection.
The burner motor speed is monitored with a sensor located
in the control unit. Operation with a separate control unit is
therefore not possible.
The fuel supply is provided from an external source via a
metering pump, which is connected to the fuel system of
the vehicle.
Fig. 201 Thermo Pro 90
4
1 = Combustion air fan
2 = Fuel connection
3 = Coolant temperature sensor
4 = Overheating protection
5 = Heat exchanger
6 = Inlet, coolant
7 = Circulation pump
8 = Outlet, coolant
9 = Exhaust temperature sensor
10 = Outlet, exhaust gas
11 = Inlet, combustion air
12 = Control unit
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