Thermo Products OH8FA119D60B Diagnostics, Diagnostic Features, CAD Cell Checkout Procedure

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1.Check for 115VAC line supply voltage to the furnace. If there is no supply voltage, check fuses and service switch.

χCAUTION: When testing electrical equipment, always follow standard electrical procedures.

2.Make sure thermostat is calling for burner operation.

3.Check oil supply and make sure all valves are open.

A. DIAGNOSTICS:

To assist in troubleshooting this appliance, it is equipped with an integrated safety and ignition control with diagnostics. These diagnostics include an indicator light that relays the operational status of the control and can help in diagnosing the condition of the flame sensor.

Diagnostic Features:

The Honeywell brand model R7184B (or alternate R7184U) safety and ignition control module used on this unit continuously monitors the operation of the heating system. If an abnormal condition occurs, the LED light on the control will rapidly flash indicating the operational status of the unit. In event this control malfunctions, the entire control should be replaced. It is not field-repairable.

In the event of an operational failure of the burner system, the rate of flashes, if any, of the ignition control module LED should be noted, before turning off power to the unit. Otherwise, power to the heating section will be interrupted and the control LED will not furnish the diagnostic flashing. It may be necessary to restart the furnace and have the failure occur again. For the model R7184B, under normal operating conditions, the LED will be continuously lit while the burner is operating.

If either control has sensed a flame failure, which was uncorrected by initiating another trial-for-ignition, the control will cease ignition trials and shutdown the burner, or “lockout”. The LED will continuously flash at a high rate (approximately 1/2-second “on”; 1/2 second “off”, for the model R7184B.

: If the appliance fails to relight after resetting the primary control twice contact a qualified service company. DO NOT continue to reset primary control.

The operational condition of the flame sensor, or “cad cell”, can be checked by depressing the reset button on the control module, while the burner is operating. Count the number of flashes of the LED and compare them to the table below.

Number of flashes

Cad Cell Resistance (in ohms)

 

Model R7184B

1

0 to 400

2

400 to 800

3

800 to 1600

4

1600 ≤

If it is necessary to troubleshoot the flame sensor independently of the burner primary, the following procedure may be used.

B. CAD CELL CHECKOUT PROCEDURE:

1.Stop burner and shutoff electrical power to the appliance.

2.Open burner junction box (on top of the burner blower) and remove the plug-in portion of the cad cell by pulling it forward from and clear of the receptacle. Connect an ohmmeter across cad cell pins. With the cell exposed to direct room light, the measured resistance should be less than 2500 ohms (in fact, it may be less than 200 ohms).

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Contents OH6FA072DV4N OH6FX072DV4R OH6FA072DV4BOH6FA072DV4R Contents = Highboy D = Downflow = FrontSafety Section Page Codes and Clearances Combustible materialNon-combustible material Highboy OH6FA072D OH8FA119D II. General Instructions Read Before Start of InstallationType Model NO.1 From Sides Front Unit Furnace TOP Sides of Plenum From Rear FLUE/VENTPrevention of Chimney Condensing ChimneyProper Chimney Size Proper Vent Connector PIPE/CHIMNEY Connection Proper Chimney HeightNo Interconnected Chimney Flues Tight CLEAN-OUT Doors and ConnectionsTight Joints Flue Pipe CLEARANCES, Sizing and TypeReduction of Clearances with Specified Forms of Protection Venting Rotation of Front Flue ElbowDraft Regulators Duct WORK/AIR ConditioningAirflow Requirements and Sizing of Duct Work Page Supply air duct sizing Example Air Filter Mounted External to Furnace ExamplesA typical filter rack and dimensions for the OH6 furnace OH6 OH8 Limit Position and LocationMaximum Filter Type Air Velocity Model Number Ft/min Burner Installation Do not remove this retainer when installing burnerBurner Specifications and Applications Do not Change Position of the ChamberBeckett Riello BTU/HRMounting the 2-STAGE Riello Burner BTU/HR Heating CapacityOIL Tank and Piping OIL Filter Electrical WiriingElectronic Air Cleaner EAC and Humidifier Installation Thermostat Anticipator Setting Fan Control ModulePreferred method of adjustment Heat Anticipator Adjustment ScaleBlower Motor Speed Selection Heating Speed Set-ups OH6FA072DV41A ECM blower motor speed chart OH8FA119DV5Heating Speed Set-ups 2 Stage OH6FX072DV4Cooling blower motor speed chart 3A Cooling blower motor speed chart Cooling Speed Set-upsOH6FA072D48 HighOH8FA119D60 12.5/1270 11.7/1200 11.2/1150 10.7/1110 10.2/1060 1020 969Terminal Definitions & Field Wiring Blower Controller Information for PSC MotorInputs OutputsOperating Modes On and OFF Blower Delay Time Switch Settings PSC Trouble Shooting Diagnostic FeaturesOperating Instructions Startup ProceduresSTOP! Read the safety information above Adjustment of Burner Combustion To Turn Off Oil to ApplianceCombustion Head Setting for 2-STAGE Riello Burner Preliminary Adjustment of Burner Air Band and Air ShutterTurn to the Left Sign AIR Damper AdjustmentTurn to the Right Sign + 1st Stage Adjustment 2nd Stage AdjustmentAdjustment Of Heat Input Rate Page Checkout Procedure III. Users Information Section Inspection AreasFilter Cleaning and Location Starting the BurnerIV. Installers Instructions to User General Inspection Dealer MaintenanceSafety During Servicing and Inspection Heat ExchangerHeat Exchanger Cleaning Instructions OH6 8FT OH8 8FT SUPPLY/RETURN AIR Blower Filter maintenance procedureElectrical System SUPPLY/RETURN AIR FilterOn Shutdown Filter replacementExtended Appliance Shutdown VI. HOMEOWNER/USER Information and Routine Maintenance On StartupPage Location of oil primary control reset button Beckett Burner Riello BurnerCAD Cell Checkout Procedure DiagnosticsDiagnostic Features Number of flashes Cad Cell Resistance in ohms Model R7184BPage VIII. Sequence of Operations Flow Chart Page IX. Trouble Shooting Flow Chart Page Page Page Page Customer Appendix a Replacement Parts Replacement Parts for OH8FA119D Appendix B Wiring Diagrams OH6FA072DV4 ECM Wiring Diagram OH6FX072DV4 ECM 2-Stage Wiring Diagram OH8FA1119D60 PSC Wiring Diagram OH8FA1119DV5 ECM Wiring Diagram
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