Raypak 302B, 902B manual External Lights, Color, Indication

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
		inoperative
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

Table P: Status LED Indicators

24.Power is also sent from pin 2 of the stage 1 con- nection to pin P1-3 of the universal diagnostic board.

25.Power is now sent to terminal TP4 of the Economaster to energize the relay and close the contacts.

26.Power is waiting at the common terminal of the flow switch waiting for closure and sufficient water flow.

27.The heater pump is energized upon relay closure of the Economaster.

28.Upon sufficient flow from the heater pump, the flow switch contacts will close.

29.If there is insufficient flow and the flow switch does not close, a 24 VAC signal is sent to the Universal Diagnostics Board to indicate the fault.

30.The flow light is energized; located on the front status panel.

31.A 24 VAC signal is also sent to the “TH” terminal located on the ignition module.

32.Once the 24 VAC “TH” signal is received at the ignition module, the internal contacts between F1 and F2 close sending a 120 VAC signal to the 120 VAC pilot duty terminals, located at J14 on the cir- cuit board.

33.The 120 VAC signal continues to the coil of the blower relay K-3 (N.O.).

34.The 120 VAC signal continues to the 120 VAC safety terminals located at J13 on the circuit board.

35.When the coil on relay K-3 is powered, the N.O. relay contacts close and energizes the blower from the J8 connections on the CPW board.

36.After proper air pressure is received in the air plenum, the air pressure switch will close.

37.If there is insufficient air pressure and the air pres- sure switch does not close, a 24 VAC signal is sent to the Universal Diagnostics Board to indicate the fault.

38.A 24 VAC signal is now sent to the blower LED on the status board.

39.Power is applied to the optional equipment inter- lock connection J9 (normally jumpered).

40.The 24 VAC signal is then sent to the 24 VAC safe- ty connector.

41.24 VAC is now sent to the pressure switch (P.S.) terminal on the ignition module.

42.Once the pressure switch signal is received at the ignition module, the heater performs a 15-second pre-purge and then the hot surface igniter is ener- gized by a 120 VAC signal from S-1 on the ignition module for approximately 30 seconds. (The hot surface igniter must draw greater than 3.1 amps while being energized or ignition lockout will occur after three tries.)

43.Once the ignition module determines that the hot surface igniter has heated up and operating prop- erly, a 24 VAC signal is output from pin GV on the module.

44.24 VAC signal is received at gas valve 1 thus ener- gizing it.

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