The STTRFSN Frost thermostat is designed to provide automatic frost protection for domestic heating systems. The STTRFSN has a volt free changeover output (SPDT) which will switch up to 16A resistive load.

Due to the volt free changeover output contacts, the STTRFSN is compatible with combination boilers. FEATURES: • Diaphragm sensing element ensures close temperature control for all loads and applications. • Attractive modern styling makes this frost thermostat ideal for locating in the living space. • The STTRFSN has volt free changeover contacts for use in cooling or heating applications. • Mounts directly onto wall or conduit box. • Improved easy-to-wire terminals. • Double insulated (No earth required for operation). • Raised Dial for ease of use. • Suitable for use with combination boilers. • Suitable for all control voltages up to 250V AC. SPECIFICATION: Temperature control range: -5°C to 10°C Switch Contacts SPDT, voltage free Switch type: SPDT (Heating/Cooling) Switch rating: 16A (resistive) @ 230V AC Switching differential: 0.50C Ambient temperature: +400C maximum Insulation: Class II Applications: Heating or cooling systems Connection type: 2 wire (switched pair) Combination boiler compatible: Yes