IOM SYSCREW AIR EVO HSE

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9.3 Refrigerant charge
WARNING
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 pressure switch may be
activated, resulting in the halting of 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.
WARNING
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 0.06 mbar.
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.
Then start the compressor and let the gas flow from the cylinder, up
until the liquid flow, which can be observed through the sight glass,
is limpid.
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 manufacturer.
WARNING
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.
9.5 Condenser
Condenser coils are of microchannel type made of 100% aluminium
(fins and tubes). In the presence of leaks caused by any damage
or shock, the coils shall be repaired or replaced by one authorised
Service Center. 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.
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 a vacuum cleaner, or a jet of water and soap can
also be used.
WARNING
Be careful not to damage the aluminium fins
during cleaning.
Standard microchannel condenser coils are made of aluminium
without coating, that is relatively corrosion resistant and suitable for
installations in areas without corrosive agents.
In case of installation in environments with high level of pollutants,
salts or other atmospheric agents that could shorten the life of heat
exchangers, it is recommended to select a proper anticorrosion
treatment protecting the overall coil.
9 - Maintenance (continued)
WARNING
Before opening the panel, the unit must stay
switched off for at least 5 minutes
WARNING
Hazardous voltages in frequency inverter
housing!
Any contact will cause severe injury or death.
Never open FI housing during operation.
In case of any operation in the FI housing,
switch off the main switch and secure it
against being switched on again.
Wait for at least 5 minutes until all capacitors
have been discharged. Close perfectly the FI
housing before switching on again.
WARNING
Before the unit is installed, make sure that the
coil configuration is compliant to Systemair
Coil Policy. For additional information, please
contact Systemair Service.