Komatsu GALEO HM350-2 Operation & Maintenance Manual page 115

EXPLANATION OF COMPONENTS
MODE SELECTOR SWITCH
Use this switch (4) to select the vents.
There are three combinations of vents: FACE, FACE/FOOT, and
FOOT.
Each time the switch is pressed, the vent display on the air
conditioner monitor changes in the order FACE, FACE/FOOT,
FOOT, FACE.
REMARK
Air also blows out from the defroster vent in FOOT mode.
DEF SWITCH
Use this switch (5) to change the vents to the DEF mode.
When the switch is pressed, the vent display on the air conditioner
monitor changes as shown in the diagram on the right.
When the DEF switch is pressed in any of the FACE, FACE/FOOT,
or FOOT modes, the system changes to the DEF mode. In
addition, when the DEF mode is being used, if the mode selector
switch is pressed, it will return to the mode being used before
switching to the DEF mode.
REMARK
Air also blows out from the foot vent in DEF mode.
RECIRC/FRESH SELECTOR SWITCH
Use this switch (6) to switch between recirculation of the internal air
(RECIRC) or intake of external air (FRESH). When the switch is
pressed, the display of RECIRC/FRESH selector symbol (C) on
the air conditioner monitor changes.
(It changes in the order RECIRC, FRESH, RECIRC.)
RECIRC: Only the air inside the cab is circulated. Use this position
when it is needed to carry out quick heating or cooling of
the cab, or when the outside air is dirty (smells or is
dusty).
FRESH: Fresh air is taken in from the outside for normal heating or
cooling of the cab. Use this position to make the air inside
the cab fresh or to remove the mist from the cab windows.
When the air conditioner takes in fresh air from the
outside, the pressure inside the cab rises and this
prevents the entry of dirt. The higher the position of the
fan switch, the more efficient this becomes.
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OPERATION