Komatsu D31EX-21, Operation & Maintenance Manual, Page: 109 / 256

OPERATION
EXPLANATION OF COMPONENTS
3-57
FRESH/RECIRC SELECTOR SWITCH
This switch (3) serves to change the air intake port when cool-
ing or warming up the cab interior.
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Inside air: When switch (A) is depressed, the air condi-
tioner takes in air inside the cab. Set the switch to this posi-
tion, when strong cooling or warming is desired. There is
no air ventilation or pressurizing function with this mode.
q
Outside air: When switch (B) is depressed, the air condi-
tioner takes in air outside the cab. Set the switch to this
position, when normal cooling or warming is desired. With
this mode, the inside air is ventilated and pressurized, pre-
venting dust from entering the cab.
When pressing this switch, indicator (C) above lights up.
TEMPERATURE CONTROL SWITCH
This switch (4) serves to set the temperature in the cab when
cooling or warming up the cab interior.
q
If this switch (A) is kept depressed, the temperature of
breeze continues to go down.
q
If this switch (B) is kept depressed, the temperature of
breeze continues to go up.
As the number of red lights in indicator lamp (C) increases, the
room temperature becomes higher. Conversely, as the number
of blue lights increases, the room temperature becomes lower.
AIR FLOW SELECTOR SWITCH
This switch (5) serves to adjust wind power from the air condi-
tioner in three stages.
Switch (A): Low
Switch (B): Medium
Switch (C): High
When pressing this switch, indicator (D) above lights up.
When stopping breeze, press OFF switch (1).