Honeywell Burner control RM7890A1015/U

Honeywell RM7890A1015/U is a burner control for single burner systems operating on gas, liquid fuel, coal, or combined fuel. It automates burner operations, monitors flame, indicates system status, performs diagnostics, and detects faults. Power supply is 120 V at 50 Hz. Dimensions are 127 mm width, 127 mm height, and 155 mm thickness with base Q7800A. Weight is 800 g. Ambient temperature range is -40 to 60 °C. Launch period is 10 seconds. It fits Q7800A and R7886 bases.

Parts of this type are selected by matching the control's power supply voltage and frequency, dimensions, and mounting base compatibility. The control must fit the specific base model (e.g., Q7800A or Q7800B) and be compatible with the flame signal amplifier used. Measure the existing control's width, height, and thickness, and verify the base type before ordering. Ensure the ambient temperature range of the equipment matches the control's specifications.

Items of this kind may fail due to electrical surges, overheating, or component wear. Symptoms include failure to start, intermittent shutdowns, or no flame detection. Check power supply connections, wiring to the base, and the flame sensor. If the control does not respond, test the base and amplifier separately.