1. LCD Wiring Diagram Presentation 42-2113-1-B / 42-2113-2-B

2. Power Off-On Switch 120V Power Supply

3. Power Switch ON

4. 24 Volt Transformer Powered

5. Low Operator

6. Call for Heat

7. Pump Relay Energized

9. Pump Contact Closes

10. Pump Energizes

12. Flow Switch Makes

13. Fan Manager Energizes

15. Fan Contact Closes

16. Fan Energized on Low Speed

18. Low Air Pressure Switch Makes

19. Pre-purge Relay Energizes

21. Low Pilot Gas Valve & R7 Relay Energized

23. R7 Contact Makes

24. Spark Generator Energizes

26. Flame Rod Senses Pilot

27. Gas Valve Energized on Low R7 Relay Drops Out Via R8 Relay

29. R8 Contact Makes

30. Safety Solenoid Energizes R7 Contact Drops Out Spark

32. High Operator Calls Second Stage

33. High Speed Blower Relay Energizes

35. Blower Ramps to High Speed

37. High Pressure Air Switch Makes

38. High Fire Relay Energizes

40. Gas Valve Energized on High Pilot Valve Energized on High

41. Loss of Pilot Flame

42. Retry After 5- Min. Wait

43. Flame Safeguard in Lockout Mode Alarm Contacts Close R1 Energizes Unit Failed to Light

45. R1 Contact Breaks

46. Fan Manager Times Out

48. Fan Drops Out

50. Pressure Switches Break

52. Reset Button Pressed

53. Pilot Ignition Retry Successful

54. High Fire Established

56. Call for Heat Drops Out

57. Blower Post Purge Times Out

58. Pump Purge Times Out

59. THANK YOU! We look forward to working closely with all of you in the near future: