Sunvic TLX2259 Room Thermostat

The Sunvic TLX2259 (Manufacturer Part Number: 2172259) is a highly reliable, wired electromechanical room thermostat engineered for light to medium-duty domestic heating applications. Renowned for its durability and straightforward operation, this standard analogue dial thermostat provides accurate on/off switching control for domestic boilers, circulation pumps, and spring-return motorised zone valves.

Utilising a responsive bimetal strip mechanism, the TLX2259 incorporates an internal accelerator heater. This feature anticipates temperature changes to reduce thermal overshoot, ensuring consistent room comfort, improved system efficiency, and lower energy bills. Whether you are replacing an obsolete control unit or sourcing a robust spare part for a central heating repair, this genuine Sunvic component delivers proven performance.

Key Features & Benefits

• Accurate Temperature Control: Easily adjustable temperature range between 3°C and 27°C using the manual control dial.
• Built-in Accelerator Heater: Anticipates temperature swings to maintain a tighter differential (less than 1°C) and prevent boiler cycling.
• Robust Switch Rating: Features Single Pole, Single Throw (SPST) on/off contacts rated at 6 Amps resistive (2.5 Amps inductive) at 230V/240V AC.
• Versatile Mounting: Supplied with a sturdy steel backplate suitable for direct surface wall mounting or fixing onto standard British Standard (B.S.) conduit boxes.
• Range Limiting: Includes pre-set minimum and maximum temperature stops to prevent unauthorised over-adjustment and save energy.

Technical Specifications

Compatibility & Installation

The Sunvic TLX2259 is universally compatible with standard 230V/240V central heating systems requiring two-wire or three-wire on/off switching controls. It serves as an excellent replacement or alternative for traditional analogue thermostats from brands like Drayton, Honeywell, and Satchwell.

Please Note: For optimal accuracy and to enable the accelerator heater function, a neutral wire connection to terminal 4 is highly recommended during installation. Always isolate the mains electricity supply before removing the cover or attempting installation.