Hydrolevel OS-100 Outdoor Sensor Kit for HydroStat 3200-Plus and 3250-Plus Boiler Controls

The Hydrolevel OS-100 Outdoor Sensor Kit (part number 48-140) is an optional accessory that automatically activates outdoor reset functionality and warm weather shutdown capability when plugged into the Fuel Smart HydroStat control. This sensor works exclusively with HydroStat 3200-Plus and 3250-Plus models, enabling advanced temperature control for improved boiler efficiency.

How It Works:

The OS-100 monitors outdoor temperature to adjust boiler water temperature, using a reset ratio method to determine how much the boiler temperature is adjusted for changes in outdoor temperature. This outdoor reset feature overrides the standard Thermal Targeting function, providing more precise temperature control based on actual weather conditions.

Kit Includes:

• Outdoor reset sensor with 30-foot cable
• Sensor mounting bracket with two screws
• Wire clip
• Two spade connectors
• Knockout wire bushing

Key Benefits:

• Improves boiler efficiency by matching output to outdoor conditions
• Reduces fuel consumption and operating costs
• Prevents unnecessary heating when outdoor temperatures are mild
• Simple plug-in installation with provided hardware

This sensor kit is designed for use with residential and commercial heating systems, providing enhanced temperature monitoring and fuel savings for oil and gas boilers equipped with compatible HydroStat controls.