Tips For Optimal Air Conditioner Usage; For Rapid Cooling; When Windows Become Clouded; Off-Season Air Conditioner Maintenance - Hitachi ZW 120-6 Operator's Manual

Tips for Optimal Air Conditioner Usage

For Rapid Cooling

Temperature in the cab may rise over 80°C (176°F) when the
machine is exposed to sun light in the summer. For rapid
cooling, ventilate air in the cab first.
After starting the engine, set the temperature control to
maximum cooling (18°C, 65°F) using temperature control
switch (9). Then select circulation mode (15) by operating
circulation/fresh air switch (13).
Select the front/rear vent mode
switch (10). Set the blower speed to the maximum flow rate
(6 segments lit) by operating blower switch (7). Then, turn
air conditioner switch (12) ON (the indicator lights).
After running the engine at a little over 1000 min-1 for a few
minutes, press AUTO switch (11) and close the windows.
When the temperature in the cab starts to lower, set the
desired temperature with temperature control switch (9).

When Windows Become Clouded

If the insides of the windows become clouded during rainy
weather or on humid days, operate the air conditioner to
aid in keeping the windows clear. When the atmosphere is
very damp, and if the air conditioner has run excessively,
the outside of the windows may become clouded. If
this happens, turn off the air conditioner to adjust the
temperature in the cab.

Off-Season Air Conditioner Maintenance

To protect each part of the compressor from a lack of
lubricant, operate the air conditioner at least once a month
for several minutes with the engine running at a slow speed
during off-season. When the cab temperature is lower than
15°C (59°F), the air conditioner may not operate. If this
happens, warm the cab using the heater first.
IMPORTANT:
 Do not suddenly increase the engine speed.
 Keep any flames away from the control panel.
 Refer to the item "Check Air Conditioner Filter" in
the Maintenance Section for maintenance of the air
conditioner filters.
 Always clean the auto air conditioner sensor for
effective air conditioner performance. Avoid placing
any obstructions around the sensor.
OPERATOR'S STATION
by operating mode
1-75
12 11 9 8
13 15
7 10
MNDB-01-011