Tech Sterowniki L-5S Mixing Valve Controller with Weather Control, PID, LCD, IP20

Precision PID control meets weather-compensated intelligence in the Tech L-5S, a wall-mounted mixing valve controller engineered to maintain exact supply temperatures in hydronic heating systems. With a graphic LCD, multi-sensor inputs, and dedicated pump control, it delivers stable comfort while cutting fuel consumption.

Overview

The L-5S manages one 3-way or 4-way mixing valve and one mixing valve pump, processing signals from outdoor, mixing valve, boiler, and optional return sensors. Weekly programming allows custom schedules for each day, and the RS communication port enables expansion with internet modules or RS room thermostats. Housed in durable plastic with IP20 protection, it operates reliably from 5°C to 50°C.

What stands out

• PID algorithm ensures accurate, stable temperature control without overshoot
• Weather compensation automatically adjusts the heating curve based on outdoor temperature
• Anti-freeze protection activates circulation during cold spells to prevent system damage
• Anti-stop function periodically exercises the valve and pump during summer to avoid seizing
• Intuitive LCD graphic display simplifies navigation and status monitoring

Technical details

• Supply voltage: 230V AC / 50Hz
• Max power consumption: 4W
• Display: LCD graphic display
• Control algorithm: PID
• Temperature sensor inputs: outdoor, mixing valve, boiler, return (optional)
• Room thermostat input: two-state or RS compatible
• Communication port: RS
• Operating temperature range: 5°C to 50°C
• Protection class: IP20
• Housing material: high-quality plastic
• Mounting type: wall-mounted

Our verdict

The Tech L-5S is a robust, feature-rich controller for residential and light commercial heating systems, offering precise PID regulation, weather compensation, and protective functions in a compact, user-friendly package.