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Before putting
the unit
Before start-up check that:
– the system has been fi lled and the
air has been bled;
– the electrical wirings have been
made properly;
– the line voltage is within the admit-
ted tolerance limits (±10% of the
rated value);
WARNING:
At least twenty-four hours before the
starting up of the unit (or at the end of
each long downtime) the unit must be
powered up in such a way as to allow
the heating elements of the compressor
casing to make any refrigerant in the
oil evaporate.
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Putting into service
If this precaution is not performed the
compressor could be seriously dama-
ged and the guarantee would no longer
be valid.
Filling/emptying of the system
During the winter period, if the system
needs to shut down, the water in the
heat exchanger might freeze causing
irreparable damage to the heat exchan-
ger itself, the complete emptying of
the cooling circuits and sometimes the
damage of the compressors.
There are three solutions to avoid free-
zing:
The complete drainage of the water
from the heat exchanger at the end
of the season and refilling at the
beginning of the next season.
Functioning with glycol water with
a glycol percentage chosen on the
basis of the minimum temperature
temperature expected. In this case
the different yields and absorption
of the chiller, the scaling of the
pumps and yield of the terminals
must be taken into account.
Use of the heat exchange heating
elements (available as accessory
KR). In this case the element must
always be powered for the entire
winter period (machine in standby).
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