Summer operation
At outside temperatures above 32 °F it is no longer necessary to inject the control lines in the ma‐
chine with antifreeze before shutting it down.
Further information See chapter 8.3 for frost protector operation.
4.6.3.2 Coolant pre-heating
The engine coolant can be pre-heated to improve cold-starting.
The power supply to the coolant preheater takes place via a separate network connector. A flexible
power cable joins the machine's power plug to the user's power socket.
The coolant pre-heater works according to the principle of self-circulation.
Fig. 7 Coolant pre-heating
1 Bodywork
2 Connecting socket for coolant pre-heating
3 Instrument panel
4 Coolant pre-heating
5 Engine
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).
Further information Starting the coolant pre-heating (see chapter 8.3).
4.6.4 Option for operating in fire hazard areas
4.6.4.1 Option la
Spark arrestor
A spark arrestor on the exhaust silencer is required when operating a diesel engine in a fire hazard
area and in forestry and agricultural applications. In such applications, a spark may ignite flamma‐
ble materials.
The spark arrestor prevents the exhaust silencer emitting any glowing fuel residue.
Further information See 10.6.3 for spark arrestor cleaning.
4 Design and Function
4.6 Options
No.: 9_9446 01 USE
SERVICE MANUAL Screw Compressor
M26
33
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