IOM SyScroll 140 360 Air EVO 361549

75
English
9.3 Refrigerant charge
Do not inject refrigerant liquid into the LP side of the circuit. Be very
careful, and charge the circuit properly. If the charge is insufficient,
the efficiency of the unit will be lower than expected. (In the worst of
cases the LP transducer may stop the unit.)
In the presence of an excess charge, the condensing pressure will
rise (in the worst of cases, the HP pressure switch may be activated,
resulting in the stop of the equipment), and the consumption will
increase as well.
It is strictly forbidden to use the compressor as a vacuum pump to
drain the plant.
Fill the refrigeration circuit after it has been drained for maintenance
purposes (leaks, replacement of the compressor etc.). The amount
of the charge is indicated on the plate affixed to the unit.
Before refilling, it is important to drain and de-hydrate the circuit, thus
obtaining a minimum abs. pressure value of 50 Pa.
Inject the refrigerant fluid before removing the vacuum, then fill the
circuit up to 90% of the total gas requirement (in liquid form). The
appliance must be filled through the filling valve on the liquid line, on
the outlet side of the condenser.
It is recommended to connect the refrigerant cylinder to the filling
valve on the liquid line, and to arrange it in such a way as to inject
only liquid refrigerant.
9.4 Compressor
Compressors are delivered with the necessary charge of lubricating
oil. During normal operation, this charge is sufficient for the whole
life of the unit, providing that the efficiency of the refrigeration circuit
is satisfactory and if it has not been overhauled.
If the compressor needs to be replaced (following a mechanical
failure or if burnt), contact one of authorised Service Centers.
Compressors use polyester oil. During maintenance operations
on the compressor, or if you have to open the refrigerant circuit in
any point, remember that this type of oil is highly hygroscopic, and
accordingly it is important that it is not left exposed to the weather for
prolonged periods, as this would require the replacement of the oil.
In a few cases, the polyester oil may be present also in R22 units (a
refrigerant that can be used also in extra UE countries).
9.5 Condenser
The condenser’s coils consist of copper pipes and aluminium fins.
In the presence of leaks caused by any damage or shock, the coils
shall be repaired or replaced by one of authorised Service Centers.
To ensure the effective and correct operation of the condenser coils,
it is important to keep the condenser’s surface perfectly clean, and
to check that there is no foreign matter, such as leafs, wires, insects,
waste etc. If the coil becomes dirty, there is an increase in the
absorption of electric energy. Furthermore, the maximum pressure
alarm may be activated and may halt the unit.
Be careful not to damage the aluminium fins during cleaning.
The condenser must be cleaned with a LP compressed air jet, parallel
to the aluminium fins, in the direction opposite to the air circulation.
To clean the coil you can use also a vacuum cleaner, or a jet of water
and soap.
9.6 Fans
The fans of the condenser, of axial type, are complete with impeller
with aerodynamic profile blades and a cylindrical nozzle. The motor’s
bearings are lubricated forever.
9.7 Dehydrating filter
The refrigeration circuits are provided with dehydrating filters.
The filter clogging is marked by the presence of air bubbles in the
sight glass, or by the difference between the temperatures measured
downstream from and upstream of the drying filter. If, once the
cartridge has been cleaned, there are still some air bubbles, the
appliance has lost a part of the refrigerant charge in one or more
points, that must be identified and serviced.
9.8 Sight glass
The sight glass is used for inspecting the refrigerant flow and the
humidity % of the refrigerant. The presence of bubbles indicates that
the dehydrating filter is clogged or the charge insufficient.
A colour indicator is positioned inside the sight glass. If you compare
the colour of the indicator to the scale on the ring of the sight glass,
you can calculate the percentage of humidity of the refrigerant. If it
is excessive, replace the filter’s cartridge, operate the appliance for
1 day and then check the humidity % again. When the humidity % is
within the pre-determined range, no other operations are required. If
the humidity % is still too high, replace the dehydrating filter again,
start the unit and operate it for another day.
9 - Maintenance (continued)