Tekmar Controls 402 Control

The Tekmar 402 House Control provides precise management for hydronic heating systems, operating on a 24Vac power supply. This versatile tN2 communication hub is engineered to coordinate a single boiler, domestic hot water (DHW) generation, and a setpoint load. It is capable of managing mixing valve control or up to four zone valves directly. The unit supports outdoor reset technology to optimize fuel efficiency by adjusting boiler water temperatures based on ambient conditions. By utilizing PID logic, the Tekmar 402 maintains tight temperature differentials, reducing short-cycling and extending equipment life. It integrates seamlessly with tN2 thermostats, allowing for synchronized demand across multiple zones. For contractors, the Tekmar 402 Control simplifies complex wiring by centralizing pump and valve logic into a single HVAC control module, ensuring consistent flow rates and thermal comfort across various radiant or baseboard applications.

• Multi-Zone Management: Efficiently handles up to four zone valves or four tN2 thermostats for balanced heat distribution.
• DHW Priority: Integrated logic ensures domestic hot water demands are met without compromising system efficiency.
• Universal Compatibility: Works as a standalone controller or as part of a larger tN2 network for complex hydronic layouts.
• Outdoor Reset: Automatically adjusts water temperature to match building heat loss, improving overall energy performance.

How do I wire a mixing valve to the Tekmar 402?
The control features dedicated terminals for mixing demands. Ensure you are using a 24Vac floating action actuator and that the system sensor is properly placed downstream of the mixing point for accurate feedback.

Can the Tekmar 402 control a variable speed pump?
While the 402 primarily manages zone valves and primary boiler pumps, it provides the necessary dry contacts and signal logic to trigger external pump controllers or relays based on zone demand.

What is the maximum number of thermostats this unit supports?
The unit acts as a bus for up to four tN2 thermostats. If additional zones are required, it can be expanded by linking further Tekmar tN2-compatible expansion modules.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.