General Life CERES HT300S RF

CERES HT300S RF is a General Life wireless room thermostat. The room unit communicates with a separate RF receiver, which switches compatible equipment through its relay.

Model Identification

Manufacturer: General Life
Series: CERES
Model: HT300S RF
Category: Wireless room thermostat
Connection: Radio link to receiver; receiver relay to equipment

Room Thermostat Specifications

Dimensions (manufacturer order)100mm / 160mm / 18.2mm

Power supply3V DC (2 x AAA alkaline batteries)

Temperature measurement figure (manufacturer-reported)0.1°C

Operating sensitivity (manufacturer-reported)(-2.0°C) – (+2.0°C)

Setpoint range(5°C) – (30°C)

Battery life (manufacturer-reported)1 year (2 x AAA)

Ambient operating temperature(-10°C) – (+50°C)

Storage temperature(-20°C) – (+60°C)

Receiver Specifications

Power supply230V (AC)

Dimensions (manufacturer order)90mm / 90mm / 25mm

Relay NO switching current (resistive load)7A (240VAC – resistive load) 10A (120VAC – resistive load)

Ambient operating temperature(-10°C) – (+50°C)

Storage temperature(-20°C) – (+60°C)

Specification scope: These values apply to the RF configuration. The thermostat and receiver have different power supplies. The receiver’s mains supply must not be confused with the equipment’s thermostat input. Relay ratings are for resistive loads. The 0.1°C measurement figure is manufacturer-reported and does not establish an independent ±0.1°C accuracy claim.

Compatibility and Installation

Confirm that the heating or cooling equipment supports the receiver’s on/off relay connection, and follow the exact equipment and thermostat manuals. The RF link replaces the cable between room unit and receiver; the receiver still needs power and an equipment connection. Electrical installation should be performed by a qualified installer.

Source and Revision Notes

The linked manufacturer document is titled “HT300-RF – HT300S-RF ENG – TPI – MITRA, ARUNA, CERES, GAIA”. An exact match of series, model and published dimensions could not be established. Its data is not substituted for the model-specific RF product table; the correct manual and hardware revision remain to be confirmed.

Wireless thermostats · CERES series · General Life manufacturer

Official Resources

Technical data checked against the model-specific manufacturer RF product page on 11 October 2026.

Official CERES HT300S RF Product Page
Official Wireless Catalog

AirAlign is an independent informational resource and is not affiliated with General Life.

RF engineering checklist — CERES HT300S RF

Room transmitter: The CERES HT300S RF housing measures 100mm / 160mm / 18.2mm and uses 3V DC (2 x AAA alkaline batteries); battery accessibility and location away from direct sunlight or radiator drafts are essential for stable room-temperature control.

Remote relay unit: The separate 90mm / 90mm / 25mm receiver requires 230V (AC). Its listed normally-open relay capacity is 7A (240VAC – resistive load) 10A (120VAC – resistive load) for the indicated resistive-load conditions. Evaluate powered boiler inputs, volt-free controls and isolating contacts before commissioning; do not use resistive ratings as inductive motor start ratings.

Settings and RF: The product card lists (5°C) – (30°C) setpoint adjustment and (-2.0°C) – (+2.0°C) operating sensitivity. This setting span is not the element’s ±2°C accuracy specification. Check radio pairing, range through the site structure, loss-of-link control behavior and receiver manual override after installation.

Version integrity: The CERES HT300S RF wireless model is not a documented equivalent of its wired or SMART relatives. Match the manufacturer receiver pairing guide, order code and heating-controller terminals to the supplied revision.