IMPELLER 3S4214 - Caterpillar

Fan Control
Illustration 1 g00847585
Heating and Air Conditioning Switch (1) - This switch controls the three-speed heater/air conditioner fan.
OFF (2) - Move the switch to this position in order to stop the blower fan.Move switch (1) clockwise in order to operate the heating system.Move switch (1) counterclockwise in order to operate the air conditioning system.
Low Speed - Move switch (1) to this symbol for the lowest fan speed.
Medium Speed - Move switch (1) to this symbol for a medium fan speed.
High Speed - Move switch (1) to this symbol for the highest fan speed.Temperature Variable Control
Setting the Temperature - Turn knob (3) clockwise for warmer air. Turn knob (3) counterclockwise for cooler air.Heating and Air Conditioning System Operation
The heating and air conditioning system can be used for four functions:
Heating - Turn switch (1) clockwise to the desired speed. Adjust temperature variable control (3) for the desired temperature.
Cooling - Turn the switch (1) counterclockwise to the desired speed. Adjust temperature variable control (3) for the desired temperature.
Pressurizing - Pressure inside the cab will help keep out dust. Close the door and the windows in order to keep pressure in the cab.
Defogging - Turn switch (1) counterclockwise in order to turn on the air conditioner. This will prevent moisture from forming on the windows. The volume of air that is needed to remove moisture from the cab varies according to the speed of the fan. Adjust the temperature variable control so that the windows remain free of moisture.