Return flow temperature maintenance with thermal control valve (45 °C) - DN 20 (¾")

Pump fitting group, can be isolated, consisting of:

- Pump
- Control valve with opening temperature 50/60 °C (± 3 K)
- 1 thermometer ball valve with red thermometer integrated in the handle, can be pulled off
- 2 thermometer ball valves with blue thermometers integrated in the handles, can be pulled off

Connections:

Thermal control valve with automatic bypass
1. The thermal valve shuts off the connection to the buffer tank, as long as the water in the boiler circuit is colder than the opening temperature of the thermal control valve. The pump circulates the water in the boiler circuit through the bypass. The small quantity of water in the boiler circuit can now heat up quickly.
2. When the boiler circuit reaches the opening temperature of the control valve, the valve reduces the bypass flow rate and opens the buffer tank circuit. The cold water from the buffer tank return is mixed with the hot boiler circuit water in the control valve. This leads to an increase of the return temperature in the boiler circuit to the desired level and avoids condensation in the boiler.
3. When the buffer tank return temperature is higher than the opening temperature, the control valve completely shuts off the bypass. Thus, the water from the buffer tank flows directly into the boiler circuit.

Please note:
If the boiler output is controlled by the boiler temperature, the boiler should heat up 20 °C above the opening temperature of the return flow temperature maintenance. Otherwise the boiler might reduce the output even before the thermal control valve is completely open.

Mounting version:
Separate assembly of the group of fittings in the flow and return.
This version permits an easy isolation of the heat generator without further shut-off valves. Consider the position of the safety group before mounting.

Additionally required:
1 x gasket, 1 x fitting and 1 x pump fitting