User Manual
CE1N2152en
13.10.2003
Siemens Building Technologies
HVAC Products
2
152
Thermostatic Head with
Immersion Sensor
RT96.27
for favourably priced water temperature control
Operates autonomously without auxiliary energy.
Quality liquid expansion sensor with a high level of control accuracy.
Setpoint setting range of 20 to 70 °C can be limited with tappets.
Use
The RT96.27 is designed to provide affordably priced water temperature control. Since
the device operates autonomously, neither an external controller nor cabling is re-
quired. It is used primarily in the following applications:
• Control of the water temperature in d.h.w. heating plant
• Constant flow and return temperature control of heat consumers in connection with
radiator and underfloor heating systems
• Control of the flow or return temperature on the primary or secondary side of heat
exchangers
Functions
The liquid expansion sensor responds to deviations from the adjusted setpoint. When
the water temperature rises, the liquid in the sensing system expands, exerting a pres-
sure on the metal bellows. The pressure is transferred to the valve stem which closes
the valve continuously. When the water temperature falls, the liquid in the sensing sys-
tem contracts so that the valve opens. This means that the valve operates continu-
ously, thus ensuring a precise regulation of the flow of water. The water temperature is
thus maintained at a constant level in accordance with the setpoint.




