EN/10.2021/i04 © STULZ S.p.A. – all rights reserved
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
7.2.
Hydraulic connections
The minimum equipment required for the external hydraulic circuit are:
•
Pipes with diameter equal to the diameter of the circuit connections, indicated in the hydraulic
diagrams in paragraph 5.10.
•
Two shut-off valves to isolate the chiller from the system in correspondence of the inlet and
outlet hydraulic connections.
•
System draining valves in its lowest points.
•
Flexible couplings to join the chiller external hydraulic circuit.
•
A filter on the chiller inlet return pipe, with metal mesh of 50 ÷ 80 μm.
•
Suitable insulation on the pipes to prevent condensation and reduce thermal on the circuit.
WARNING
Before connecting the chiller to the utility, make sire that the pipes used do not contain dirt or
processing residues; if in doubt, perform one or more washing cycles.
The position of the hydraulic connections is shown in the dimensional drawings in paragraph 6.7.
Remove the protective plugs from the connections and connect the pipes of the external
hydraulic circuit complying with the inlet and outlet direction of the chiller. The inlet and outlet of
the hydraulic circuit are marked with the labels shown on paragraph 2.2.
7.3.
Electrical connections
DANGER
Before performing any operation on electrical parts, make sure that there is no voltage.
Make sure that the earthing system of the unit is efficient.
•
Make sure that the power supply matches with that indicated in the data plate of the chiller
(voltage, phase number, frequency) and that the values are not out of the range indicated in
paragraph 6.1.
•
Moreover,the phase-to-phase unbalance rate should never exceed 2%. The phase-to-phase
unbalance rate is determined by measuring the voltage differences between phases. The
average value of the voltage differences should never exceed 8 V.
•
Select the power cables according to the total inrush current of the unit, which is indicated in the
technical sheets in paragraph 6.3.
•
A disconnection switch with protection having the same tripping curve of the main disconnection
switch on board the unit must be installed on the distribution panel upstream the power cables
(refer to the electrical diagram attached to the documentation). The tripping value of this
disconnection switch must be selected according to the length of the power supply lines and to
the Standards in force in the country of installation.
•
Identify the holes for the passage of power and signal cables placed on the rear of the unit.
•
Set the main disconnection switch to position 0 After this operation, you will be able to open the
covering panels of the electrical compartment to complete the connections.
•
Connect the power cable, suitably sized, to the electrical panel, following the electrical diagram
supplied together with the unit documentation.
•
Connect the earth cable to the PE clamp on the chiller electrical panel.
•
Some digital outputs of the electronic control are available to signal alarms and unit status.
The assignment of the outputs to the various alarms and status can be configured. The factory
configuration is shown in the connection diagram, which is part of the unit electrical diagram.
Upon request, connect these signals according to the indications.
•
Connect the external ON-OFF control, or other external devices (if provided), according to the
electrical diagram.
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