User Manual

TIC LEXION 500 Electric System
03/05 Lex-e-38b 38b-3
Description of function:
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Automatic air conditioner Together with the cab fan speed controller module (A7), the automatic air
conditioner module (A6) provides the complete temperature control inside
the cab.
This involves both actuating the cooling compressor electro-magnetic
clutch (Y32) via relay K24 and switching the heater circuit on and off if
required via solenoid coil (Y109) until the set values agree with the actual
values of the corresponding sensors.
The two closed gas-pressure switches (Z22/Z23) must supply relay K24
with earth in order to allow the function of the electro-magnetic clutch
(Y32).
The temperature switch (Z74) prevents icing on the evaporator.
If the earth signal fails due to one of the two gas-pressure switches
(Z22/Z23), the electro-magnetic clutch (Y32) disengages and this fault is
displayed in terminal (A30).
econ operation In this operating mode, the cooling compressor is not activated. The entire
air conditioner control is realised by the heater and the fan.
REHEAT function In this operating mode, the cooling compressor is permanently activated.
The ambient sensors (e.g. outside temperature sensor) is not considered
here.
Activation is for a defined period of time (see also Operator's Manual).
Test menu:
Key to diagram: 1 Key for activating the test menu
2 LED (without function in the test menu)
3 Key for activating the test menu
4 LED (without function in the test menu)
5 Key (without function in the test menu)
6 Key (without function in the test menu)
7 LED bar display indicates the evaporator fan speed
8 Display field (3 digits) Indicates the temperature in the test menu.
9 Display (1 digit). Indicates the measuring points in the test menu.
10 LED (without function in the test menu)
11 Key for leaving the test menu. A RESET is carried out after
confirmation.
12 LED (without function in the test menu)
13 Key for activating the test menu
LED (without function in the test menu)