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NORA Oilheat Technicians Manual

does not go off on safety, replace it and be sure to check the timing on the new control. 4. If the control does go off on safety, reconnect the lead to the F terminal and press the reset button. The safety is working properly. Troubleshooting tips If the oilburner does not start: Verify that electrical switches are in the ‘ON’ position and that the thermostat is set above room temperature. Be sure that there is not a fire burning in the unit. Remove the primary control’s cover and visually check to see if the spring-loaded mechanism has locked off on safety. If the primary control is NOT off on safety, check for proper voltage coming from the limit control. If there is sufficient line voltage, remove one lead from the F-F terminals. If the burner starts, the problem is in the cad cell sensor or wires. The cell may be sensing light or the wires may have been shorted. If the burner does not start, disconnect all the thermostat leads and install a jumper. If the burner starts, the problem is in the thermostat or its wiring. Did you know? Leaving the thermostat wiring connected to the control while testing may harm today’s computerized thermostats. If the primary is off on safety, check the combustion chamber to be sure the unit is not saturated with oil. If the chamber contains excess oil, follow your company’s procedures to eliminate the oil. Never attempt to fire an oilburner into a saturated chamber! If the chamber is free of excess oil, press the reset button. If the primary control energizes but the burner motor does not turn—shut off the service switch and check the electrical connections and the burner motor reset button. If the burner runs and flame is established but the control shuts off on safety, disconnect the cad cell leads, press the reset and, before the unit shuts off on safety again, place a 1000-ohm resistor across the F-F terminals. If the burner continues to operate with the Chapter 11 Primary Controls Cad Cell Checkout—Burner On Ignition Electrode Air Tube C554A Ohmmeter Ignition Transformer Ohmmeter C554A Nozzle 11-10 Primary Controls Light Cell Resistance Under 1600 ohms Primary Control Blower Nozzle Remove Cad Cell Leadwires From the Primary Control Start Burner Jumper Terminals—Allows Burner to Run Connect Ohmmeter to Cad Cell Leadwires—Must Read Less Than 1600 Ohms Cad Cell Checkout—Burner Off Ignition Electrode Air Tube Primary Control Blower Start Burner Remove the Jumper Check Resistance—Must Be 100,000 Ohms or More When Dark


NORA Oilheat Technicians Manual
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