11. EXPLANATION OF COMPONENTS 4. EXTERNAL/INTERNAL AIR CHANGEOVER SWITCH Changes between internal air circulation and external air intake. When pressing the switch, the indicator lamp on the top of switch lights up. Internal air circulation This is used when wishing to quickly cool or warm the cab or when the air inside the cab is stale. External air intake This is used for fresh air intake or to remove condensation on windows. 5. TEMPERATURE CONTROL SWITCH The temperature can be adjusted steplessly from low tempera- ture to high temperature. The temperature level indicator lamps light up to display the temperature of the air coming from the vents.
The more the green lamps light up, the lower the temperature is. The color of the indicator lamp changes while the switch is being pressed. When the temperature reaches the desired level, release the switch to set the temperature. The settings for each mode are retained in memory even when the starting switch is turned OFF. However, in the following cases, the settings must be made again.
When the machine has been out of use for more than 7 days When the battery voltage is extremely low When there has been abnormal interference from outside When the fan switch is turned OFF (the setting is not kept in memory with only the air conditioner switch) If the air conditioner is used at the FRESH position, the inside of the cab will be pressurized and this will prevent the entry of dust. The higher the position of the fan switch, the more effective the pressurizing becomes. 2-41