Honeywell Defrost Controls

Overview

The HONEYWELL os-100 is an outdoor sensor kit designed to enable warm weather shutdown functionality in hydronic heating systems. This sensor monitors outdoor air temperature and signals the boiler control to suspend heating operation when ambient conditions reach a threshold that makes heating unnecessary. The result is automatic, temperature-based system management without manual intervention. Licensed HVAC technicians and hydronic heating specialists are the primary installers of this component in both residential and light commercial applications. The os-100 is intended for use with compatible Hydrolevel boiler controls that support outdoor reset or warm weather shutdown logic. In a typical installation, the sensor mounts on an exterior wall or in an outdoor-rated location and connects to the control board via low-voltage wiring. This allows the control to read real-time outdoor temperature and make automated decisions about boiler firing, improving system efficiency during transitional seasons when full heating load is not required. Key Features Enables warm weather shutdown to prevent unnecessary boiler operation during mild outdoor temperatures Designed for outdoor installation to accurately sense ambient air temperature Integrates with compatible Hydrolevel boiler controls for automated system management Supports hydronic heating efficiency by reducing boiler run time during shoulder seasons Compatibility Designed as an OEM-style outdoor sensor for use with…