PLCs, Power Supplies & Others

This microprocessor-based burner control unit manages ignition sequencing and flame supervision for oil, gas, and combination fuel systems. It provides three trial-for-ignition periods and supports intermittent or continuous pilot operation modes. The unit combines automatic burner sequencing, self-diagnostics, and system status indication into one compact enclosure.

Sequence Control and Timing Features

The Honeywell RM7888A1027 operates on 120 Vac (+10/-15%) at 50/60 Hz (±10%) and consumes a maximum of 10W power. The pilot flame establishing period lasts 4, 10, or 15 seconds depending on configuration. The main flame period runs 10 seconds or remains intermittent as required. Preignition occurs before the purge cycle begins for proper sequence control. A 15-second postpurge follows each burner cycle completion.

Technical Specifications

User Interface and Diagnostics

Five front-panel LEDs provide clear sequence status information for operators at a glance. A five-function Run/Test Switch simplifies startup procedures and field diagnostics significantly. Nonvolatile memory retains history files and lockout status even after power loss occurs. The included keyboard display module enables easy system monitoring and configuration. Interchangeable plug-in flame amplifiers offer flexibility for different flame detection methods.

System Compatibility and Application

This unit works with Q7800A or Q7800B universal wiring subbases and various flame amplifiers including R7847, R7848, R7849, R7851, R7852, R7861, and R7886. It replaces older models such as the BC7000/PM720M seamlessly. Industrial boilers, commercial HVAC heating systems, and fuel-fired process equipment benefit from this control. The unit’s robust safety features make it suitable for high-safety combustion environments requiring data logging and remote diagnostics. Its multiple trial-for-ignition options suit applications that need extended ignition attempts.

Details