The Honeywell RM7890A1056 and RM7890B1048 Relay Modules are microprocessor based integrated burner controls for automatically fired, gas only, single burner applications. The RM7890A1056 and RM7890B1048 System consists of a relay module, subbase, and amplifier. Options include keyboard display module (KDM), Data ControlBus Module., personal computer interface, remote display mounting, first-out expanded annunciator and Combustion System Manager Software.
Functions the RM7890 provides include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting.
RM7890A1056 and RM7890B1046 Relay Modules offer the following additional features:
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Preignition Interlock Input
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Selectable Intermittent/Interrupted Pilot Function (full pilot flame and main flame establishing periods apply if interrupted pilot feature selected).
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Run/Test Switch for interrupted pilot setup.
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Blinkum fault annunciation on safety shutdown (power LED blinks a fault code.
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Built-in features set up only using the S7800A1142 display.
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Valve Proving System.
The Valve Proving System feature provides a systematic way of testing the valve seat integrity to assure the valves are indeed in the closed state when the system is in Standby.
