DIN-rail thermostat – temperature controller for pool heat exchangers

Electronic DIN-rail thermostat – simple, reliable heating control

The RTD-2.17 electronic thermostat is designed for DIN-rail mounting in a control cabinet. It controls pool water heating, hot tubs and other heating circuits where reliability, simplicity and long-term operation without complex controls are priorities.

Set the temperature using the rotary dial with a scale on the front panel. The thermostat includes a DS18B20 digital temperature sensor with an approximately 2.5 m cable, which can be extended to tens of metres if required.

Accurate temperature measurement

For correct control operation, we recommend positioning the temperature sensor directly in the pipework using a T-piece with a temperature sensor thermowell. This ensures accurate water temperature measurement and prevents incorrect switching of the heating.

Function and operating principle

After the desired temperature is set, the thermostat automatically switches the output relay on when the temperature at the sensor falls below the set value. A red LED indicates an active output, while a green LED indicates standby. The output can control a contactor coil or smaller appliances up to 750 W.

Safe operation in the control cabinet

The thermostat is intended for permanent connection to the electrical installation and must be protected by an external circuit breaker (6 A, type B recommended). DIN-rail mounting makes it ideal for pool control cabinets and control systems.

Typical uses

• controlling pool water heating
• controlling a heating circuit through a contactor
• simple temperature control without a display
• accessory for heat exchangers and pool heaters

Main technical specifications

Pool technician’s tip

Always use the thermostat with a contactor and flow protection. This ensures safe heating operation and protects the pipework and equipment from overheating.