MTU 12V4000M*3 series, Operating Instructions Manual

Page: 236 / 283

8.17.7 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 Rated voltage / frequency Heating power kW
12V 230 V / 50 Hz 9
400 V / 50 Hz 9
230 V / 60 Hz 9
440 V / 60 Hz 9
16V 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 circula-
tion of the preheated engine coolant through the engine.
The continuous flow heater (5) comprises a heating element. The thermostat (7) switches off the preheating
unit via contactors when the engine coolant temperature has reached the setting of the thermostat (7).
In the event of excessive coolant temperature, the temperature limiter of the thermostat (7) opens the con-
trol loop. The preheating unit is switched off.
The unit must be reset manually after the fault has been rectified.
234 | Coolant Circuit, General, High-Temperature Circuit | MS15035/00E 2018-08
TIM-ID: 0000014749 - 006