Manitou MHT 10225, Repair Manual

Page: 97 / 105

(07/03/2012) 110-04-M184EN
110
8
OPTIONS - ATTACHMENTS CONTROL AND
ADJUSTMENT
AIRCONDITIONING PLANT – CHECKING THE WORKING
Electronic control of the temperature (E.AC.C.)
To check to ensure the correct working of the heating and cooling system, make sure the engine is
started up with the hoods closed, at ambient temperature b15°C and 30°C and the engine
cooling fl uid suffi
ciently hot.
If the ambient temperature is higher or lower than these values, the system automatically adjusts itself
in the maximum cooling or maximum heating conditions.
1 - Checking the water regulator valve
Press the cab internal temperature increase/decrease button, the water regulator valve shifts to the
maximum heating
HI or maximum cooling LO condition.
Make sure the mixed air temperature changes accordingly.
2 - Checking the mixed air temperature sensor
If the sensor is defective, the following error codes appear on the display:
E5 = Mixed air temperature sensor (MT) open.
E6 = Mixed air temperature sensor (MT) short circuit.
3 - Checking the cab internal air temperature sensor
If the sensor is defective, the following error codes appear on the display:
E3 = Internal air temperature sensor (IT) open.
E4 = Internal air temperature sensor (IT) short circuit.
4 - Operating the compressor
On pressing the ECON button, the relative LED lights up and switches off alternately and the compressor
is activated and deactivated, respectively, by means of the electromagnetic clutch.
5 - External air inlet and recirculation command
On pressing the Recirculation button, the relative LED lights up indicating the condition of ventilation
with recirculating air. On pressing the recirculation button again, the LED switches off indicating the
condition of ventilation with external air inlet.
6 - Fan speed command
The cab ventilation can be adjusted at three fan speeds: minimum, medium and maximum.
7 - °C and °F selection
When the relative LED is Off , the temperature is indicated in °C , when the LED is On the temperature
is read in °F (Fahrenheit).
The maximum cab temperature value setting is 37°C or 99°F.
8 - External temperature sensor connector
On pressing the external temperature button (Ref. 11), the external temperature value appears on the
display.
If the sensor is defective, the following error codes appear on the display:
E1 = External air temperature sensor (ET) open.
E2 = External air temperature sensor (ET) short circuit.