Emerson Climate Technologies 3049-115 Mercury Flame Sensor

Product Description

The EMERSON CLIMATE TECHNOLOGIES 3049-115 is a 48-inch mercury flame sensor with a plug-in Type-D configuration, designed for use as a flame safeguard control in gas-fired HVAC equipment. It continuously monitors for the presence of a flame at the burner. When flame loss is detected, the sensor signals the gas valve to shut off, preventing unburned gas accumulation and the associated hazards. This component employs MercFlame detection technology, which provides consistent and repeatable flame-sensing response. Licensed HVAC technicians and gas appliance service pros are the primary installers of this part.

This flame sensor is suited for residential and light commercial gas-fired equipment including furnaces, boilers, and water heaters. The plug-in Type-D connection format simplifies field replacement without the need for hardwired splicing. The 48-inch lead length provides enough reach to accommodate typical burner-to-control board distances in standard cabinet configurations. It is installed in applications where continuous flame monitoring is required as part of the burner control sequence.

Key Features

• 48-inch lead length for reach in standard furnace, boiler, and water heater cabinets
• Plug-in Type-D connector for tool-free, drop-in field replacement
• MercFlame technology provides reliable and repeatable flame detection
• Functions as a flame safeguard control to shut off gas supply on flame loss
• Compatible with gas-fired furnaces, boilers, and water heaters requiring continuous flame monitoring

Compatibility

Designed as an OEM-style replacement flame sensor for gas-fired HVAC equipment including furnaces, boilers, and water heaters that accept a plug-in Type-D mercury flame sensor configuration.

Installation Notes

Installation and replacement of mercury flame sensors must be performed by a licensed HVAC or gas appliance technician in accordance with applicable local codes and the equipment manufacturer's service instructions. Shut off gas supply and disconnect electrical power to the appliance before servicing any burner or flame-sensing components. Mercury-containing components are subject to environmental handling regulations and must be disposed of in accordance with local hazardous materials ordinances. Do not modify the sensor lead or connector during installation.