6.14.9 Preheating unit
Hotstart preheating unit
1 Plastic cap (drain)
2 On/Off switch
3 Plastic cap (supply line)
4 Shutoff valve
5 Continuous flow heater
6 Vent valve
7 Thermostat
8 Circulation pump
Cylinders
Nominal voltage / frequency
Heating power kW
12 V
230 V / 50 Hz
9
400 V / 50 Hz
9
230 V / 60 Hz
9
440 V / 60 Hz
9
16 V
230 V / 50 Hz
12
400 V / 50 Hz
12
230 V / 60 Hz
12
440 V / 60 Hz
12
Function
The preheating unit is intended to warm up the engine coolant. The circulating pump (8) ensures the
circulation of the preheated engine coolant through the engine.
The continuous flow heater (5) comprises a heating element. The thermostat (7) switches off the pre-
heating unit via contactors when the engine coolant temperature has reached the setting of the thermo-
stat (7).
In the event of excessive coolant temperature, the temperature limiter of the thermostat (7) opens the
control loop. The preheating unit is switched off.
The unit must be reset manually after the fault has been rectified.
200 | Task Description | MS150035/01E 2013-11
TIM-ID: 0000014749 - 005
