Raypak 302A-902A manual External Lights, Color, Indication, Internal Lights

External Lights

Light	Color	Indication
Power	Blue	Main power is on
Call For Heat	Yellow	Thermostat is closed
Safety	Red	One or more safeties is inopera-
		tive
Ignition	Red	Ignition module is inoperative
Flow	Green	Flow is present
Blower 1	Green	Blower 1 is on
Stage 1	Green	Stage 1 is on
Stage 2	Green	Stage 2 is on

Internal Lights

Light	Color	Indication
Board Power	Yellow	Board power is on
Low Water Cut-Off	Red	Low water cut-off is open
Blocked Vent	Red	Vent is blocked
Manual Reset Hi-Limit	Red	Manual reset is open
Low Gas Pressure	Red	Low gas pressure
Switch
High Gas Pressure	Red	High gas pressure
Switch
(Not Used)	Red
PVC Vent Limit	Red	Vent temperature exceeds
		limits
Auto Reset High Limit	Red	Auto reset option

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.

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