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6. OPERATION
CITIMAX series are powered on Road mode by the
vehicle battery (alternator).
In this chapter, we will state the operation principle
respectively.
6.1 DIN Operation principle
For its big volume, we should install the DIN display
board in the fixed place of the cab cage.
After starting up, the refrigeration unit by pressing the
key, unit start-up and shut-down are
automatic.
An open-type compressor is driven by the engine of
the vehicle. The vehicle battery (alternator) powers the
evaporator and condenser fans. The unit automatically
shuts down when the engine is switched off with the
ignition key.
The unit can be completely shut down manually by
pressing the
key on the cab command.
Temperature control
As soon as the set-point temperature has been reached,
temperature control is obtained by shut down and
start-up of the electro-magnetic clutch.
Condenser fan is controlled by the microprocessor and
evaporator fan(s) cut out during regulation. When
transporting fragile loads such as fresh meat,
vegetables and cheese, it is possible to program the
microprocessor to obtain continuous ventilation by the
evaporator during regulation.
Defrost
－
Frozen unit only
Defrost operation is fully automatic but can be
manually controlled.
- Defrost cycles are fully controlled by the integrated
microprocessor.
- During the defrost cycle, the evaporator fan shuts
down. The condenser fan is controlled by the
microprocessor.
- Defrost cycle termination is controlled by a timer or
defrost temperature sensor (DTS).
- During the defrost cycle, the cab command display
indicates "d F".
Heating - For frozen unit with heating function
option
Heating is provided by hot gas system.
The evaporator fan operates, the condenser fan is
controlled by the microprocessor
.
6.1.1 To start the unit
1. Start the vehicle engine.
2. Start the unit by pressing the
key. Start-up
is time-delayed for 50 seconds.
3. The digital display of the cab control displays the
box temperature.
4. Check the temperature setpoint is correct by
pressing the
key. The setpoint temperature is
highlighted on the digital display.
5. Enter a new setpoint if necessary (See To change
setpoint temperature– paragraph 6.4)
In the event of difficulty on start-up, check that:
- The main road fuse has not blown. If it is ok, contact
your Carrier Service centre.
- The temperature selected by the cab control has not
been affected.
6.1.2 To stop the unit
- For a short stop (ex. delivery): switch off by the
vehicle ignition key.
- For a long stop: press the
key in the cab
command.
6.1.3 To change setpoint temperature
Important
If, when settings are adjusted, no key is activated
within 5 sec. the system reverts to displaying the
box temperature. All changes made are recorded.
If the cab command is built into the vehicle control
panel, the command unit must be located as far as
possible
from
the
heating
ducts.
Maximum
temperature of exposure : 85°C.
1. Press the
key to display setpoint
temperature.
2. Press the
or
key to change the
setpoint.
3. Press the
key to return to box temperature
display.
