The Honeywell RM7890A1056 On-Off Primary Control, 120Vac, Intermittent Pilot, 4 Second or 10 Second Pilot Flame Establishing Period, Intermittent Main Flame Establishing Period, Preignition, Includes Programmable VPS ( Valve Proving Switch ) Check Feature and Blinking LED Fault Annunciation.
Functions encompass automatic burner sequencing, flame supervision, system diagnostics, and troubleshooting with external voltage checks. It provides application flexibility and communication interface capability.
Equipped with five LEDs for sequence data, a five-function Run/Test switch, and interchangeable plug-in flame amplifiers, it allows optional local or remote annunciation of RM7840 operation and faults. Nonvolatile memory preserves history and lockout status post-power loss, compatible with existing Honeywell flame detectors. Additionally, it includes a dust cover and an AirFlow switch check option.
- Flame Establishing Period ? Pilot, 4 sec or 10 sec
- Flame Establishing Period ? Main, 10 sec or 15 sec
- Early Spark Termination ? Yes, 5 sec
- Required Components: Q7800A,B Universal Wiring Subbases, R7847, R7848, R7849, R7851, R7852, R7861, or R7886 Flame Signal
- Amplifier, ST7800A Plug-in Purge Timer Card
