DHW heating in the flow principle:
The domestic hot water is heated in the flow principle only during the request via a stainless steel plate heat exchanger. A temperature and flow sensor according to the vortex principle detects the temperatures and flows. The controller regulates the necessary heating energy for the plate exchanger by means of a step a valve stepper motor valve. The plate exchanger is not kept warm. Unnecessary circulation loss is avoided and increased legionella formation is effectively prevented. The second step a valve stepper motor valve built into the secondary outflow can be operated via the controller as an EnEV-compliant weather-compensated regulated heating circuit, fixed value control (setpoint) and as a domestic hot water priority circuit.

Legend:

1. Cabinet
2. Connecting rail with ball valves
3. Plate heat exchanger
4. step a valve stepper motor valve (drinking water)
5. Vortex sensor temperature and flow
6. Cold water outlet
7. Maximum cold water limiter (optional)
8. Fill and drain
9. Strainer CW (optional)
10. Strainer HS (optional)
11. Fitting cold water meter 3/4″ – 110 mm
12. Fitting heating meter 3/4″ – 110 mm
13. Temperature provision valve (bypass) with actuator
14. Controller
15. Floor control group (low temperature NT)
16. Radiator outlet (high temperature HT) (optional)
17. step a valve stepper motor valve (heating)