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EN/06.2016/i01 © STULZ S.p.A. – all rights reserved
WPA ExPlOrEr OrIGINAl INSTrUCTIONS
Open the vent valves. See the exact location of the vent valves in the hydraulic scheme. If the
unit is equipped with an automatic vent valve you don’t have to open the valve manually.
A standard chiller provides vent valves at the evaporator. If the chiller is equipped with free cool-
ing, there are also vent valves on top of the free cooling coils. If the unit is equipped with a stor-
age tank, there is an additional automatic vent valve installed on this component.
Check whether the stop valves in the supply line are open . Connect the pump for filling the
circuit to the provided filling point. See the exact location of the filling point in the hydraulic
scheme.
Begin filling the water circuit. As soon as liquid comes out of a vent valve for several seconds,
this can be closed.
WArNING
If the planned filling of water contains glycol, connect filling hoses to the vent valves, to
catch the discharging mixture and dispose of it separately.
WArNING
Once the circuit is filled, the freeze protection function is essential. Check if the circulation
pumps are supplied with power and that they are properly connected to the controller.
Further make sure that the valves of all pumps are set OPEN.
6.8 Electrical connection
WArNING
The electric cables are only to be connected by an authorized specialist.
The connection terminals are designed for copper cables.
• Ensure that the electric cables are de-energized and the unit is turned off.
• Ensure an appropriate isolation of all sources of supply to the unit.
• The unit must dispose of an effective earthing.
• These units are provided for 400V/3Ph/50 Hz.
• No additional controls must be installed in the control panel.
• According to EN 60204 the operator is responsible to install current protection devices
between the supply conductors and the power supply connection of the unit.
• Consider local regulations for the electrical wiring.
WArNING
Do not touch electronical components, without taking care of protective ESD measures.
