TECH controller for installations i-3PLUS white — controls 3 valve actuators and solar input (STI3PLUSWH)

TECH controller for installations i-3PLUS white is a wired zone controller designed to manage up to three valve actuators and a dedicated solar input. The unit centralizes control of heating or HVAC zones with independent actuator outputs, multiple sensor inputs and solar loop coordination, providing a straightforward solution for residential and light commercial multi-zone installations.

Advantages

The controller offers independent outputs for three valve actuators, enabling separate control of three heating or cooling zones. A dedicated solar input allows basic coordination with a solar thermal loop or external solar controller. The wired connection ensures reliable communication and stable power delivery, while the compact white housing supports neat installation in electrical cabinets or switch boxes. Built-in sensor inputs provide flexibility for temperature or flow monitoring without requiring additional interface modules.

Suitable for

• Control of up to three heating or cooling valve actuators in single-family homes
• Light commercial HVAC zoning where independent actuator outputs are required
• Systems that integrate a solar thermal circuit for domestic hot water or auxiliary heating
• Retrofit projects needing centralized wired control for multiple zone valves

Key specifications

• Three independent actuator outputs for valve control
• Dedicated solar input for solar loop integration
• Wired installation format for fixed electrical mounting
• Multiple sensor input capability for temperature or flow sensors
• Compact white enclosure suitable for cabinets and mounting panels

How to use

Mount the controller in an appropriate electrical enclosure following local wiring regulations. Connect each valve actuator to its respective output and wire sensor probes to the sensor inputs according to the installation diagram. Link the solar loop or external solar controller to the dedicated solar input to enable solar coordination. After wiring, apply power and configure basic settings as required for zone priorities and sensor types. Verify actuator operation and sensor readings before placing the system into regular operation.

Usage recommendations

Use compatible valve actuators and sensors specified for low-voltage wired controllers. Ensure all wiring is performed by a qualified electrician and that the controller is installed away from direct moisture and excessive heat. For systems with solar integration, confirm correct sensor placement on the solar loop and test mixing or priority functions during commissioning.