Manitowoc Grove GMK6300L Operating Manual page 748

Crane operation
11.7 Heating and air-conditioning system
Preheating the
crane cab
H
11 - 136
If the crane cab is to be preheated in addition to the engine, adjust the
heating system as follows:
The amount of time required to preheat the engine will be increased
significantly by simultaneously heating the crane cab.
•
Switch (1) to position Warm .
•
Switch (3) to the Recirculated air symbol.
•
Switch (2) to the required fan level.
•
Open the air vents;
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Operating Manual GMK6300L