Airwell SWS 2652 HFС 134a [76/82] English
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Airwell SWS 2652 HFС 134a [76/82] English

Airwell SWS 2652 HFС 134a [76/82] English
Page 75
English
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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 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 Compressors
The frequency of the checks to be made on compres-
sors depends on a variety of factors, first of all the
working conditions. Anyway, it is advisable to adopt
the following tips:
I
After 300 hours of work, check the conditions of
the oil: a certain amount of impurities from the sys-
tem may accumulate in the oil of the compressors.
I
Check the acidity of the oil every year.
I
After 8000 hours of work, carry out a visual in-
spection on the suction/discharge valves for wear.
If necessary, replace these components. If compres-
sors are started/stopped frequently or in particular-
ly demanding working conditions, it is advisable to
reduce this period to 5000 hours. Anyway, this
time is indicative only.
I
After 24000 hours of work, carry out a general
overhaul of the compressor. If the compressors
work for a period shorter than 40% of a year, the
overhaul can be performed every about 5 years.
This period depends on the type of application, the
working conditions, the duration of start/stop cy-
cles.
If it is necessary to replace the compressor
(in case of burning of the winding or me-
chanical failure), contact one of Itelco-Indus-
try ’s Service Centres.
Compressors use polyester oil, for both the
versions manufactured for R134a and
R407C. 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 replace-
ment of the oil.
9.5 Condenser
Check the condenser water side for cleanliness at
regular intervals. This may be accomplished by
checking water side pressure drop (refer to Section
9).
Soiling of the condenser results in increased con-
densing pressure, which reduces efficiency and in-
creases current consumption and may cause the high
pressure switch to activate.
It is advisable to supply the condensers with antial-
gae and anti-line treated water.
If soiled, the heat exchanger must be chemically
cleaned by Authorised service personnel.
For other types of service (special maintenance, heat
exchanger replacement, etc.), contact an Authorised
Service Centre).
Manuale SWS-SWR EN2.qxp 19/11/06 11:21 Pagina 75

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