Preheating Unit - MTU 12V4000M*3 series Operating Instructions Manual

8.16.9 Preheating unit

Hotstart preheating unit
1 Plastic cap (drain)
2 On/Off switch
3 Plastic cap (supply line)
Cylinders
12V
16V
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.
4 Shutoff valve
5 Continuous flow heater
6 Vent valve
Rated voltage / frequency
230 V / 50 Hz
400 V / 50 Hz
230 V / 60 Hz
440 V / 60 Hz
230 V / 50 Hz
400 V / 50 Hz
230 V / 60 Hz
440 V / 60 Hz
MS15036/00E 2018-08 | Coolant Circuit, General, High-Temperature Circuit | 323
7 Thermostat
8 Circulation pump
Heating power kW
9
9
9
9
12
12
12
12