Fig. 11 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 peri‐
od of more than 3 hours is not necessary, as the maximum effect has already been achieved within
this period (thermal balance).
Continuous operation of maximum 6 hours must be followed by a rest of approximately 3 hours.
4.7.3 Option oa
Optional battery isolating switch
The «battery isolating switch» disconnects the battery completely from the machine's electrical sys‐
tem (fire protection, battery discharge protection).
NOTICE
Danger of short circuit!
Damage to the machine electrics is possible.
➤ Use the «battery isolating switch» only when the machine is shut down.
➤ Do not use the «battery isolating switch» as a main or emergency switch.
Fig. 12 Battery isolating switch
1 «Battery isolating switch»
4 Design and Function
4.7 Options
No.: 9_6974 20 E
Service manual Portable compressor
M122
41
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