ACV Thermostat Pocket 39438027

The ACV Thermostat Pocket 39438027 is a dry well sensor sleeve with a 1/2-inch thread and a 500 mm length, made of stainless steel. It is designed for precise installation of temperature sensors in ACV boilers, ensuring proper sealing and accurate temperature measurement. This component is compatible with ACV HeatMaster 85 TC, Compact Condens 35, and Smart 210 models. It protects the sensor from fluid and features a corrosion-resistant construction for a perfect fit with original ACV sensors.

Parts of this type are selected by matching the thread size and insertion length to the boiler's immersion well. The sensor sleeve must be compatible with the boiler model and the sensor's diameter. Before ordering, verify the thread type (e.g., 1/2 inch) and the required length (e.g., 500 mm) against the boiler's specifications. Installation typically involves screwing the dry well into the boiler's tapping and inserting the sensor into the well.

When such a dry well fails or is damaged, it may leak, allowing fluid to contact the sensor, leading to inaccurate temperature readings. The boiler may display erratic temperature values or fail to regulate properly. Check for corrosion, cracks, or improper sealing, and ensure the well is not blocked or deformed.