Commissioning; Use; Controls - CombiSteel 7480 Serie Mode D'emploi

COMMISSIONING


Before actuating the main switch make sure that the unit is provided with compressor preheating system.
In this case, to execute the preheating the unit is to be supplied, even though the main switch has not to be
switched on so that only the compressor crankcase heater is supplied.

Leave the machine in this condition for a few hours; the duration of this preheating phase depends on the
temperature of the place where the unit is set: the higher the temperature is, the less this phase lasts (3
hours), the colder the climate is, the more the preheating-time has to last (8÷10 hours).

At the end of the preheating, set the main switch in the "start" position or press the "ON/OFF" button of
the remote control panel.
N.B. If the instrument does not start, control if the unit is provided with a voltage monitor (par. 10-3); in this case
you have to wait for the counting end of this device (about 6 minutes).

USE

For a correct use, the product has always to be put in the cold room with a maximum temperature of 5°C higher
than the preservation one and you have to reduce the openings of the cold room door to the minimum necessary;
furthermore when you position the product in the cold room, make sure that it does not obstruct the correct
flow of air through the evaporator.
The optimal working conditions are at a temperature between 15°C and 40°C and with moisture between 30 and
95%.
Utilization:
High and Medium temperature models: ..............Preservation of fresh products
Low temperature models: ....................................Preservation of frozen products

The units have to be used only for these purposes.

Utilizations different from those above-mentioned are not allowed.

The manufacturer disclaims all responsibility for injuries to persons or damages to things due to an
inappropriate, wrong or irrational use.

CONTROLS

The devices that control the unit working are the following (fig. 9-A):
9-1 Electronic control instrumentation
It can be of two types: the electronic control panel (standard on the VT, SF, SV and CS models) or the instrument
(for the VS, AC, SL models). The same instrumentation type is installed on the units provided with remote control
panel. The main differences consist in the fact that the electronic control panel has many more functions than
the instrument, furthermore has a separate keyboard from the power side and the main switch and the cold
room light switch are located in its inside. Both equipment perform the functions of room thermostat and defrost
control, besides many other functions described in the specific handbook enclosed with the documentation, in
which the instructions for their use and programming are indicated as well.
9-2 Fan pressure switch
It is a device that is installed only on specific request (standard on the Bi Block units forms 4 and 5) and it is used
as a regulator of the condensation pressure; its use is absolutely necessary when the unit is installed outdoors,
where the temperature can be 0°C or even lower. The control happens as follows: the pressure switch is
connected on the supply line of one of the condenser fans and it is in communication with the compressor
delivery line. When the pressure on this line is higher than the programmed value of the pressure switch, the fan
is set in motion in order to increase condensation, on the contrary if the pressure is lower, the fan stops to avoid
an excessive condensation. The pressure switch is fixed next to the compressor, it is calibrated at 15 bar in the
units with R22 refrigerant and at 18 bar in the units with R404A refrigerant. The differential is calibrated at 2,5
bar.
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