Table N: LED Indicators
24. Upon sufficient flow from the heater pump, the
flow switch contacts will close.
25. The flow light is energized; located on the diag-
nostics panel.
26. A 24 VAC signal is also sent to the “TH” terminal
located on the ignition module.
27. Once the 24 VAC “TH” signal is received at the
ignition module, a 120 VAC signal is sent from F2
on the ignition module to the 120 VAC pilot duty
terminals, located at J-14 on the circuit board.
28. The 120 VAC signal continues to the coil of the
blower relay K-3 (N.O.).
29. The 120 VAC signal continues to the 120 VAC
safety terminals located at J-13 on the circuit
board.
30. When the coil on relay K-3 (N.O.) is powered, the
relay contacts (K-3) close and energizes the blow-
er from the J-8 connections on the CPW board.
31. After proper air pressure is received in the air
plenum, the air pressure switch will close.
32. A 24 VAC signal is now sent to the blower LED on
the diagnostics board.
33. Power is applied to the optional equipment inter-
lock connection (normally jumpered).
34. The 24 VAC signal is then sent to the 24 VAC safe-
ty connector.
35. 24 VAC is now sent to the pressure switch (P.S.)
terminal on the ignition module.
