Putting Into Service - AERMEC nsb 1251 Manual De Instalación

MASTER
TX-
TX+
GND
Before putting
the unit
Before start-up check that:
– the system has been filled and the air has
been bled;
– the electrical connections have been
made properly;
– the line voltage is within the admitted
tolerance limits (±10% of the rated
value);
WARNING:
At least twenty-four hours before starting
up the unit for the first time (or at the end
of each period of prolonged downtime)
the unit must be powered up in such a way
as to enable that the heating elements of
the casing of the compressors to allow any
refrigerant in the oil to evaporate. If this
precaution is not performed the compressor
could be seriously damaged and the
guarantee would no longer be valid.
SLAVE1
TX-
TX+
GND

Putting into service

Putting into service
into operation
If requested, the start-up of this series can be
performed by the local AERMEC assistance
service free of charge.
The putting of the unit into operation must
be previously agreed on the basis of the
system implementation times.
Before the intervention of the AERMEC After
Sales Service all the operations (electrical
and hydraulic hook ups, loading and
breather from the system) must be in place.
For the set up of all the functional
parameters and for detailed information
regarding machine functioning and the
control card, refer to the user's manual.
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 exchanger itself,
SLAVE2
TX-
TX+
GND
N.B.:
In the models from 5703 to 7203
A - E, that are sent separately, at
the moment of installation, it is
necessary to put the two units in
network by connecting the two PC0
MASTER SLAVE 1 on the electrical
box of the double module with that
of SLAVE 2 in the electrical box of
the single module (see figure) using
exclusively a shielded AWG20/22
cable made of a twisted pair and
a shielding for communication
standard RS485. The cards are
connected in parallel referring to
terminal clamp J11.
Respect the network polarity: RX/
TX+ of one card must be connected
to RX/TX+ of the other card and
the same thing for the RX/TX-.
the complete emptying of the cooling
circuits and sometimes the damage of the
compressors.
There are three solutions to avoid freezing:
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 glycoled water with a
glycol percentage chosen on the basis
of the minimum external
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.
The use of the exchanger heating
elements (as standard on all equipment).
In this case the element must always be
powered for the entire winter period
(machine in standby).
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