Honeywell Infrared flame signal amplifiers R7849A1015/U

The Honeywell R7849A1015/U is a solid-state modular amplifier that responds to signals from C7027, C7035, or C7044 infrared flame detectors, indicating flame presence when used with 7800 and R7140 series relay modules. It measures flame signal intensity in the range of 0 to 5.0 V. The amplifier connects to the 7800 relay module via an edge connector and is configured for its own orientation. It has dimensions of 91 mm width, 85 mm height, and 23 mm thickness, weighs 70 g, and operates in ambient temperatures from -40 to 60 °C.

Parts of this type are selected by ensuring compatibility with the relay module series (e.g., 7800 or R7140) and the specific flame detector model. The amplifier must match the detector's signal type (infrared) and be configured for the correct orientation. Installation involves connecting the amplifier to the relay module via the edge connector and verifying that the flame signal voltage can be measured at the control sockets.

Items of this kind may fail by not responding to the flame detector signal, resulting in no flame indication or false flame loss. Symptoms include the burner shutting down or failing to start, with the flame relay not energizing. Check the amplifier's connections, the detector's signal output, and the voltage at the flame signal sockets to diagnose issues.