TacoTherm Dual ZEPTO

Safety

2.3.1.2 Safety DCW valve (Option)

Fig. 4: Safety DCW valve

2.3.1.3 Backflow preventer

Fig. 5: Backflow preventer

The safety DCW valve (Fig. 4) depressurises the station in the event of

excess pressure on domestic cold/hot water site. The safety valve is

calibrated for a pressure of 10 bar and does not need to be set during

commissioning.

A pressure relief line must be connected to the safety valve during

installation (

Ä Chapter 5.4.5 ‘Connecting the pressure relief line to

the safety valve’ on page 39).

The backflow preventer (

Ä Further information on page 12) is

installed in the screw connection for the pump. It prevents incorrect

circulation and is integrated into the pump connections as an insert.

2.3.2 Safety equipment to be installed by the operator

Earthing

Fuses for electrical circuit

Pressure safeguard

Pressure drain outlet pipe

The unit must be connected to earth by a trained electrician in

accordance with local regulations. The earthing can be fastened to

the installation frame or to the base plate.

The electrical circuit must be equipped with fuses in compliance with

local regulations. Furthermore, an electrical fuse exclusively for the

unit must be provided. This fuse must be clearly labelled. An easily

visible description of the location of the fuse must be affixed to the

unit.

The operator must ensure that the pressures permitted in the in-

house water system are complied with.

The unit is equipped with a safety valve on secondary heating. The

operator must ensure that a pressure drain outlet pipe is designed

and installed in accordance with technical regulations.

12

Operating instructions

V03 06/2025 Item no. 215250 EA no. 1292