Fig. 10 Frost protector
1 Control line (bypass line)
2 Shut-off ball valve
3 Control line (defrosting)
4 Frost protector
Operating the machine in cold temperatures:
The frost protector is activated when the machine is started or stopped in ambient temperatures
below freezing. Due to the anti-freeze in the air flow, valves and control lines in the interior are
moistened preventing a freezing of the control and regulating system.
During machine operation, the generated innate heat counteracts a potential freezing of individual
components.
Machine operation in Summer:
Anti-freeze is not required for the regulating air at ambient temperatures of more than 0 °C.
4.7.2.2 Option bb
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 (supplied) connects the machine's power plug to the user's power socket.
The coolant pre-heater works according to the principle of self-circulation.
4 Design and Function
4.7 Options
40
Service manual Portable compressor
M122 No.: 9_6974 20 E
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