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KEYBOARD DISPLAY: RM7840G1022 PROGRAM CONTROLLER FOR VPS LHL-LF PROVEN PURGE. INTEGRATED BURNER CONTROL FOR GAS, OIL, COAL OR COMBINATION FUEL SINGLE BURNER USES. PROVIDES SAFETY, FUNCTIONAL CAPABILITY AND FEATURES BEYOND NORMAL CONTROLS. WITH VALVE PROVING FEATURE. RM7840 REQUIRES KEYBOARD DISPLAY.