The FSP1535 Tester provides a quick operational check of a Honeywell RA890 or R4795 Protectorelay Primary Control. Indicator lights visually represent the functions of ignition, pilot, and main valve as the unit operates through its sequence. Units with rated voltage from 100 to 240V, 50/60 Hz, can be tested by connecting the line cord to a voltage source equal to the rating of the unit under test. Pushing the proper test button drops the flame current below the normal operating range to test for flame relay drop-out. The flame current can be monitored by plugging a W136 Microammeter (or equivalent meter) into the unit\'s flame current jack.