Fig. 6 Frost protector
1
Shut-off valve
2
Control line (frost protection)
3
Frost protector
4
Control line (bypass line)
5
Oil separator tank cover
Frost protection
The frost protector comes into action when the machine is stopped in ambient temperatures below
freezing. The compressed air carries antifreeze to coat and protect airlines and valves. This pre‐
vents freezing up of control and regulating components.
The heat of the machine prevents individual control components freezing up during operation.
Summer operation
At outside temperatures above 0 °C it is no longer necessary to inject the control lines in the ma‐
chine with antifreeze before shutting it down.
Further information See chapter 8.4 for frost protector operation.
4.6.2.2 Option bb
Coolant pre-heating
The engine coolant can be pre-heated to improve starting under cold conditions.
A separate mains power connection provides power to the coolant pre-heater. A flexible power ca‐
ble joins 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
4.6
Options
No.: 9_9432 02 E
Service Manual Screw Compressor
M43
31
RAMIRENT
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