WDE
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© STULZ SpA . – all rights reserved EN/36B/08.2018
DANGER
The inobservance of these points can provoke damages or malfunction of components and
warranty shall become forthwith void.
For use of leakage-current (FI) circuit breakers, EN 50178 5.2.11.2 must be taken into
account. Only type B pulse-current FI circuit breakers are permitted. FI circuit breakers do not
provide protection against bodily harm during operation of the unit or frequency converters.
• Main and emergency 48 VDC power supply lines (if present), must be connected to the power
terminal board inside the electric box. To reach this position, insert the cables in the holes on the
rear panel of the unit, behind the internal air return opening. Opening on the left is for main power
supply cables, while one of the two openings on the right is for DC power supply. These openings
are ducted directly to the electrical box, as shown in the following drawing.
• Digital outputs (alarms), analogue inputs (humidity probes) and digital inputs (customer’s external
devices) can be connected to C2020 controller via screw terminals inside the electrical box.
Terminals are named C1 (outputs from C2020) and C2 (inputs to C2020). Opening for passage of
signal cables is near the one for DC power supply. Cable is directly guided to the electrical box.
ATTENTION
All the devices connected to the digital outputs and analogic inputs of the controller, must
be connected to a SELV type power source (voltage limit 42Vdc/ac). The digital inputs of the
controller must be connected to voltage-free contacts.
Please refer to use and maintenance manual part 2 for more information.
Route of cables inside WDE unit
Holes for cables
Ducts to e-box
