Application:

The SR91 controller is designed to manage solar thermal systems, ensuring efficient water heating in the storage tank. The device controls the operation of the solar pump based on the temperature difference between the collector (T1) and the tank (T2), which guarantees optimal use of solar energy.

Once the set switch-on temperature difference is reached, the controller automatically starts the circulation pump (R1), beginning the tank charging process. The process continues until the switch-off temperature or the maximum tank temperature is reached.

Technical Data:

- Power supply: 100–240 V ~ (50–60 Hz)

- Rated impulse voltage: 2.5 kV

- Housing: ABS plastic

- Mounting: Wall-mounted

- Operation: 10 buttons on the front panel

- Protection class: IP40

- Maximum heater power: 1500 W

The set includes:

- SR91 controller

- User manual

- PT1000 temperature sensor (1.5 m)

- NTC10K temperature sensor - 2 pcs. (3 m)

- Power cable

Advantages:

The device offers a wide range of functions, such as manual mode, backup heating, ECO function, and thermal disinfection. Thanks to automatic pump control based on the temperature difference, it ensures high efficiency and energy savings. Additional protections, such as pump dry-run protection and flow monitoring, increase the safety of use and the durability of the installation.

Its compact design, intuitive operation, and wall-mounting capability make the controller ideal for modern solar systems.

Notes:

- Device intended only for use in dry rooms

- Sensor wires should be routed away from power cables

- Avoid installation near strong electromagnetic fields