Elektrical Connection; Commissioning; Maintenance And Cleaning - Wilo VBH-Serie Einbau- Und Betriebsanleitung

the valve head and, depending on the local conditions, lead and fastened to the pilot float valve (Fig.4b
and 4c).

7.8 Elektrical connection

DANGER! Danger of death!
Improper electrical connections can lead to fatal electrical shocks.
 Always have the electrical connection performed by a qualified electrician.
As electrical connection(s), only the float switch (low water signal sensor (11)) has to be connected to
the control unit of the pressure booster system and, if present, the float switch (as overflow alarm
sensor (33)) has to be connected to a corresponding alarm switching device.
For this, the description of the control unit and its connection diagrams must be observed. The float
switch is always available as a changeover contact, i.e. it can be connected both as a normally open
contact and as a normally closed contact. (Fig. 7) For information on which switching logic must be
used for the relevant control unit, refer to the relevant operating instructions.
DANGER! Danger of death!
 The max. switching voltage, rating and switching current of the float switch may
not be exceeded. (see chapter 5.2).
The control voltage of the pressure boosting system control device can also be found by consulting the
associated installation and operating instructions. If this control voltage is greater than the maximum
switching voltage of the float switch (see Section 5.2 Technical data), then this float switch may not be
connected. Wilo after-sales service should be contacted in such cases in order to replace the float
switch with a different model.

8 Commissioning

The tank must be cleaned and sufficiently flushed before it is commissioned. Contaminants should not
be permitted to find their way into the pressure boosting system and into the potable water network
while these tasks are being performed. See in this connection Section 7.2 Hygiene.

9 Maintenance and cleaning

Wilo break tanks require no maintenance for functioning. It is recommended that the tank be checked
for leaks and the inlet and drain lines for proper functioning when maintenance work is performed on
the pressure boosting system.
It is urgently recommended that the tank be cleaned at regular intervals. Cleaning and disinfection is
particularly necessary in connection with usage in potable water applications. Applicable laws,
regulations and standards are to be taken into account to this end. Please observe the instructions to
be found under Point 7.2 Hygiene to this end. The tank must be drained completely before work can be
performed on it. Work inside the tank should not be carried out unless another person is present
outside the tank.
Maintenance and repair may only be carried out by qualified experts!
For work in the tank, it is essential to comply with legal occupational safety regulations and
rules (e.g. DGUV regulation 113-004)!
The tank must be completely emptied before entering.
Work in the tank may only be done in the presence of at least one other person outside the
tank!
PLE Systems & Solutions, Engineering Center Systems Oschersleben
2530098 Ed.3 EBA-VBH- vorläufig De/En- 01.11.2018
English
49