To obtain a copy of the test booklet it is necessary to contact the INAIL department of Padua.

To obtain a duplicate of this declaration of conformity, simply send a request to the fax number 049 767321 or to the e-mail address tec@zilmet.it. The following data must be specified in the request, reported on the identification label applied to the expansion tank: product family (for example CAL-PRO), drawing number, maximum operating pressure, production date, factory number, capacity of the expansion vessel and pre-charge pressure value. Since the duplicate of the declaration of conformity is sent by post, it is necessary to accompany the request with the following information: complete address to which the documentation should be sent, name of the contact person and complete company name.

The term drawdown indicates the quantity of water expelled from the expansion vessel before the pressure switch activates the pump. The drawdown depends on the characteristics of the pump, the size of the vessel and the different pressure settings in the system.

As regards the installation and maintenance methods of expansion tanks and heat exchangers produced by Zilmet SpA, refer to what is reported in the user manuals available in the reserved area of our website. In particular, to prolong the life of the expansion tanks and guarantee their correct functioning, it is necessary to periodically check the precharge value, as indicated in the user manual and on the identification label.

To find out the warranty conditions it is necessary to contact the local distributor of reference.

To ensure correct operation and prolong the life of Zilmet products, it is necessary to follow what is indicated in the user manual, in particular what is specified in the point relating to maintenance.

For the sizing of expansion vessels and heat exchangers it is possible to refer to the calculation programs available on our website.

Installation of the expansion vessel with the connection facing upwards is possible. However, under the same operating conditions, for the installation of the expansion tank with the connection upwards (compared to the installation with the connection downwards) the discharge of the water stored inside the expansion tank requires more time: in any case it is necessary to always refer to what is reported in the user manual for installation and maintenance methods available in the reserved area of our website.

Yes. It is possible to check whether the diaphragm has failed by slightly opening the pre-charge valve with the appropriate tool; if water comes out, it is most likely a failure of the membrane and the expansion vessel must be replaced (if with a fixed membrane) or the membrane must be replaced (if with an interchangeable membrane). If, however, the above check is not sufficient, it is possible to disconnect the vessel from the system, preload it to a defined value and carry out the recheck after 24 hours; if the pressure has significantly decreased, then the membrane is no longer efficient. Any checks or adjustments must be carried out by qualified and authorized personnel.

No: expansion vessels suitable for installation in heating systems or solar systems cannot be used for the production of potable/sanitary water.