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Fig. 21 Coolant pre-heating
1
Instrument panel
2
Connection for the coolant pre-heater
3
Engine block
4
Coolant pre-heating
The ideal coolant pre-heating period is 2-3 hours before the machine is started. A pre-heating period
of more than 3 hours is not necessary, as the maximum effect has already been achieved within this
period (thermal balance).
4.11 Option ob, od
Start/stop/automatic option
Automatic engine start/stop
The start/stop automatism can be set in the SIGMA CONTROL MOBIL controller for automatic ma‐
chine start.
Trickle charging the starter batteries
For the starter batteries of the machine to be sufficiently charged for the starting the drive engine even
after longer standstill times, a battery charger is used. This battery charger is connected to the user's
electrical system.
4.12 Option va
"External fuel pump" option
The machine may be connected to an external controller. The external fuel pump required is operated
with the SIGMA CONTROL MOBIL controller.
4
Design and Function
4.11 Start/stop/automatic option
No.: 9_9425 01 E
Service Manual Screw Compressor
M170 SIGMA CONTROL MOBIL
51
Option bb
Option ob
Option od