2 Product description
2011/11
99473903xNA – V02
9
2.2
Thermal control valve [Specialist]
The thermal control valve (A-3) serves as a bypass in the start-up phase.
When the temperature of the water in the boiler circuit is lower than
the opening pressure of the thermal control valve, the valve is closed
and thus the line to the consumers. The water is circulated in the
boiler circuit through the completely open bypass.
When the water in the boiler circuit has obtained the opening
temperature (+/- 3 K), the thermal control valve opens the line from/to
the consumers. The circulation in the consumer circuit is thus
guaranteed. The cold water from the consumer return line is mixed in
the control valve with the hot water from the bypass. Depending on
the temperature and the flow rate of the water from the return line, the
thermal control valve shuts off or opens the line to the consumers.
Thus the return line which leads to the boiler always remains at a
certain temperature level.
With rising temperature from the return line of the consumers, the
thermal control valve opens the line to the consumers completely.
The temperature of the boiler return remains nearly constant
(+/- -3 K).
