Functional description

TacoTherm Dual ZEPTO

3.3.1.6 Differential pressure control valve

Fig. 13: Differential pressure control

valve

3.3.1.7 Capillary tube

Fig. 14: Capillary tube

3.3.1.8 Safety valve secondary heating

Fig. 15: Safety valve

3.3.1.9 Fill and drain valves

Fig. 16: Fill and drain valves

The differential pressure control valve (Fig. 13) ensures the requisite

constant supply pressure. It is set to 300 mbar ex-works.

The differential pressure control valve must be set during commis-

sioning ( Ä Chapter 8.1 ‘Setting the differential pressure control

valve’ on page 45).

The capillary tube (Fig. 14) measures the differential pressure

between the primary connection heat supply flow and the return.

The safety valve (Fig. 15) depressurises the heat interface unit in the

event of excess pressure. The blow off pressure on the secondary

heating side totals 3 bar.

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 fill and drain valves (Fig. 16) are used to fill and drain the relevant

pipe sections.

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

Operating instructions

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