Steca STR1 Temperature Difference Regulator

• Individually adjustable switch-on temperature difference, switch-off hysteresis and maximum storing temperature
• Display unit for the storing and collector temperature
• Temperature sensor with error flag
• Storing temperature limitation
• Easiest assembly and handling
• Coordinate safety concept
• Hand-gear control
• Status display 

Our STR 1 includes everything that is needed for a thermal solar system. Apart from the controller for temperature differences an electronically controlled limitation of the storing temperature has been built in. Of course, it is possible to adjust hysteresis, temperature difference and max. storing temperature individually. By using the hand-gear control you can adjust the pump for testing or other operations. A display indicating the temperature informs you about the collector temperature to be stored. Another very important point was the breakdown safety switch which does not lower your solar system’s performance since it is very low in self-consumption. The regulator is supplied including a collector temperature sensor and a storage temperature sensor in the lower storage tank area for limiting the maximum storage temperature.

The STR1sets new guidelines in its relation of price and performance.

Main functions:

• Temperature difference control and storing temperature limitation by two-point control.
• Adjustable hysteresis, temperature difference and maximum storing temperature
• Temperature display with DUE-LED can be switched from collector to storage
• Hand-gear control (on/off/auto)
• displays for "Circuit on", "Pump on" and "Warning"

Safety functions:

• Protection from atmospheric excess voltage by varistor
• Transformer
• Short cicuit proof
• Switch relay with double dimension
• Overcharge protection by built-in regulator
• Switch-off and warning in the case of sensor breakdown

Technical Data:

Nominal voltage	230 V / 50 Hz
Max. energy pump	5 A
Max. self consumption	< 1 W
Adjustable temperature difference	3-17 K
Adjustable hysteresis	2-14 K
Adjustable max. storing temperature	20-95 °C
Temperature probe	KTY-10
Admissible surrounding temperature	0-70 °C
Weight	255 g
Dimensions	130 x 90 x 45 mm