External Lights
Light | Color | Indication | |
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Power | Blue | Main power is on | |
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Call For Heat | Yellow | Thermostat is closed | |
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Safety | Red | One or more safeties is inopera- | |
tive | |||
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Ignition | Red | Ignition module is inoperative | |
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Flow | Green | Flow is present | |
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Blower 1 | Green | Blower 1 is on | |
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Blower 2 | Green | Blower 2 is on | |
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Blower 3 | Green | Blower 3 is on | |
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Stage 1 | Green | Stage 1 is on | |
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Stage 2 | Green | Stage 2 is on | |
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Stage 3 | Green | Stage 3 is on | |
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Stage 4 | Green | Stage 4 is on | |
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Table M: Status LED Indicators
24.Power is also sent from pin 2 of the stage 1 con- nection to pin
25.Power is now sent to terminal TP4 of the Economaster II 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 II.
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
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
36.After proper air pressure is received in the air plenum, the air pressure switches will close.
37.If there is insufficient air pressure and the air pres- sure switches do 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 (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
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