Honeywell Rectification flame amplifier R7847B1072/U

The Honeywell R7847B1072/U is a rectification flame amplifier designed for use with Honeywell 7800 series relay modules. It operates based on flame rectification, responding to input signals from a flame detector to indicate flame presence. The amplifier features flame signal control sockets for measuring the flame signal voltage, with an intensity range of 0 to 5 V. It measures 91 mm in width, 85 mm in height, and weighs 70 g. The ambient temperature range is -40 to 60 °C. It connects to the 7800 relay module via an edge connector and is configured for its own orientation.

When selecting a replacement flame amplifier of this type, ensure compatibility with the specific relay module series (e.g., 7800 series) and the flame detector used. The amplifier must match the mounting orientation and electrical connections of the existing unit. Verify the physical dimensions and weight to fit the available space. Check the flame signal voltage range and ensure it aligns with the system's requirements.

Common failure modes for this type of amplifier include loss of flame signal detection, intermittent flame indication, or complete failure to respond to the flame detector. Symptoms may include burner shutdowns, failure to ignite, or false flame signals. Check the amplifier's connections, the flame detector, and the signal voltage to diagnose issues.