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17. 24VM (RED L.E.D.) Control voltage at the spare inputs.
18. FVLV (RED L.E.D.) This L.E.D. will indicate the status of the Front Gas Valve. If the Front Gas
Valve is open (ON), then the L.E.D. is ON.
19. RVLV (RED L.E.D.) This L.E.D. will indicate the status of the Rear Gas Valve. If the Rear Gas
Valve is open (ON), then the L.E.D. is ON.
20. SPR1 (RED L.E.D.) This is for a spare input to be used with programmable outputs.
21. SPR2 (RED L.E.D.) This is for a spare input to be used with programmable outputs.
22. SPR3 (RED L.E.D.) This is for a spare input to be used with programmable outputs.
23. SPR4 (RED L.E.D.) This is for a spare input to be used with programmable outputs.
24. SPR5 (RED L.E.D.) This is for a spare input to be used with programmable outputs.
25. +24 (RED L.E.D.) This L.E.D. will indicate the board voltage that is protected by Fuse #2.
26. 24IN (RED L.E.D.) This L.E.D. will indicate 24 VAC to the board.
27. MCR+ - (RED L.E.D.) This L.E.D. will indicate the status of the Control Voltage. If the Power On
button is pressed (Green Button Light is On), then the L.E.D. is On.