PILOT VALVE HOLD, MANUAL OPEN SWITCH. RM7838B1021/U 120 V, 50/60 HZ. SELECTABLE INTERMITTENT OR INTERRUPTED PILOT VALVE, 10 SEC MFEP. PROGRAMMABLE VALVE PROVING FEATURE AND POST PURGE AND BLINKUM FAULT ANNUCIATION. ALARM SOUND UNTIL FLAME IS SENSED. RM7838C1004/U 120V, 50/60HZ SELECTABLE...