Central heating thermoregulator TECH ST-431N is a controller for 3-way or 4-way mixing valve which can also control a mixing valve pump. The controller ST-431N can be connected to a room thermostat with RS communication (ST-280, ST-298) or internet control module ST-500 as an accessory.

As befits a decent controller there is a possibility of thermoregulation schedule in weekly mode in the range of Monday-Friday and Saturday-Sunday and weather control sensor with external temperature adjustment plan. Summer mode function and expandability to work with a room temperature thermostat. Security in the form of temperature alarms like damage to the mixing valve sensor, water return sensor and weather sensor. The controller has two operation modes master and slave relating to the boiler controller.

Functions performed by the mixing valve controller:

• smooth three or four-way mixing valve steering
• pump control
• control up to two other valves by means of additional modules ST-61 v4 or ST-431n
• ability to connect the ST-505 ETHERNET module
• return water temperature protection
• weather control and weekly schedule
• cooperation with a room regulator with RS or two-state communication
• prevent water stagnation and performing pump decalcification (antistop function)

Central heating thermoregulator TECH ST-431N content:

• LCD display with adjustable contrast
• boiler temperature sensor
• mixing valve temperature sensor
• return water temperature sensor
• weather sensor
• housing suitable for mounting on the wall

Central heating thermoregulator controller ST-431N example usage in a central heating installation with additional accessories

1. solid fuel fired boiler
2. boiler controller from TECH family
3. internet control module (ETHERNET)
4. mixing valve modules ST-61
5. boiler temp. sensor
6. return water pump
7. return water sensor
8. mixing valve
9. pump
10. mixing valve sensor
11. mixing valve controller ST-431N
12. weather sensor
13. room thermostat
14. domestic hot water storage tank
15. mixing valve sensor
16. pump
17. mixing valve
18. mixing valve
19. pump
20. mixing valve sensor
21. floor heating installation