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© STULZ S.p.A. – all rights reserved EN/06.2016/i09
WSA ExplOrEr OriginAl inStructiOnS
6.9 position of the electrical connections
The electrical connection lines can be introduced into the electric cabinet from the bottom. The
position of the opening for the wires can be adjusted within the range of the panel shown in the
following views.
Cuttable
removable
pannel
Lower view, front side
Cuttable
removable
pannel
The power supply system on site and the pre-fuses must be designed for the total current of the
unit (“5.5 Technical Data” at page 41). Make sure that the power supply corresponds to the
indications on the rating plate and that the tolerances according to the “5.1 Application limits” at
page 35 are not exceeded.
Route the electric cable into the electric cabinet from below and connect the PE conductor at
the PE rail and the three phases to the main
switch, in accordance with the wiring diagram
(part of the unit documentation). Use a cable
gland on the bottom panel to fix the cable.
Connect the ground cable to the base of the
chiller using on the designated position identi-
fied by the grounding symbol.
Use screw with a minimum diameter Ø 8 mm.
The cable must contain a terminal lug.
WArning
Make sure that the phase rotation is correct, the rotating field has to turn right!
The compressor is dependent on correct phase rotation. The sense of rotation will be checked
at the factory before dispatch. An inverse rotating field would damage the compressor.
The asymmetry of phase between the conductors may amount to 2% maximal.
To determine the asymmetry of phase measure the voltage difference between the phase con-
ductors (L1-L2, L2- L3, L1-L3) and calculate the average value of the measured voltages. With
a voltage supply of 400V/3Ph/50 Hz, the maximum deviation to the average value of the voltag-
es may not exceed 8 V .
Alternatively, you can check the phase rotation by using the controller. For this, close the electri-
cal cabinet and turn the main switch to position I. If the phase rotation is incorrect, the controller
display shows an alarm symbol.
