Airwell MQL 15 [34/40] English
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Airwell MQL 15 [34/40] English

Airwell MQH 12 [34/40] 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 pressure switch may be activated, re-
sulting 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 ac-
tivated, resulting in the stop of the equip-
ment), 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 indi-
cated on the plate affixed to the unit.
Before refilling, it is important to drain and de-hy-
drate the circuit, thus obtaining a minimum abs. pres-
sure value of 50 Pa.
Inject the refrigerant fluid before removing the vacu-
um, then fill the circuit up to 90% of the total gas re-
quirement (in liquid form). The appliance must be
filled.
It is recommended to connect the refrigerant cylinder
to the filling valve, 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, until charging operation is done.
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 cir-
cuit 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 Itelco-
Clima’s 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 pre-
sent 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. 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 ener-
gy. 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 com-
pressed 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 com-
plete 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 dehydrat-
ing filters (MQL-MQH 4-8).
The filter clogging is marked by the presence of air
bubbles in the sight glass, or by the difference be-
tween the temperatures measured downstream from
and upstream of the drying filter. If, once the car-
tridge has been cleaned, the problems persist, it
means that the appliances has lost part of the refrig-
erant charge in one or more points, that must be
identified and serviced.
Page 33
English
Maintenance
Manuale MQL-MQH 10.6.2005 12:26 Pagina 33

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