Honeywell Burner control EC7850A1072/U

The Honeywell Burner control EC7850A1072/U is a controller for burners and boilers. It automates burner operations, monitors flame, indicates system status, performs self-diagnostics, and detects faults. It supports external voltage control and has a communication interface. It features 5 LEDs and a 5-function switch for mode selection. It has non-volatile memory for process history and lockout status. Technical data: ambient temperature -40 to 60 °C, transport temperature -40 to 66 °C, humidity 85% non-condensing, power supply 220-240 V, 50/60 Hz, power consumption 10 W, fuse rating 20 A, start-up period 2 seconds, dimensions 127 x 127 x 133 mm (with base Q7800A), weight 700 g, connected load 2000 VA.

Parts of this type are selected by matching the mounting base and compatibility with the existing system. The controller fits a 22-pin mounting base (Q7800A or B). It is compatible with specific flame signal amplifiers (R7824, R7847, R7848, R7849, R7861, R7886) and accessories like the Q7700 Network Interface Unit, S7810A data bus module, S7820 remote reset module, and ZM7850A software. Ensure the base type and voltage supply match before installation.

Items of this kind may fail due to electrical surges, overheating, or component wear. Symptoms include failure to start, erratic operation, or lockout without reset. Check the fuse, wiring connections, and flame detector signal. If the controller does not respond, verify power supply and replace if necessary.