Thermo Products OH6FA072D48N, OH8FA119DV5R, OH8FA119D60R, OH6FA072DV4N, OH6FX072DV4R, OH8FA119DV5B

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the supply and return air systems added together cannot exceed the maximum external static pressure that can be supplied by the appliance blower.

f.Determine the required flow rate for each branch of the supply and return air systems. The total airflow rate, by adding the airflow rate of each branch of the supply system, must equal the minimum required airflow rate (refer to part 3, above). Likewise, the airflow rate of each of the branches of the return air system must sum to the required minimum flow rate.

g.Using the selected air flow rates for each component of the duct system and manufacturer’s literature, or published literature on duct system pressure drops, the pressure drop for each component in the duct system can be estimated.

The ASHRAE Handbook – Fundamentals is an excellent source of duct system design principles and pressure drop data. Conversely, for a specified type of fitting, it is also possible to determine the required size or diameter of the component for a specified pressure drop and flow rate.

h.The resistance of the take-off and the outlet register (or return grill) should then be summed together to determine the total pressure drop for each branch. This value should be close to the assumed value for the pressure drop of the system. If it is not close, then flow rates for each branch must be adjusted, or the design of the duct system must be altered, to give the proper pressure drops. Usually, the cross-sectional area of the ductwork should be changed in order to adjust the pressure drop to a suitable value. Refer to Example 2, (page 14) for a sample calculation of how to use this method for sizing the supply side ductwork for a residence.

Table 3 shows the air handling capacities of 100-ft. lengths of circular and rectangular ductwork based on a 0.1 in. W.G. static pressure drop. The first column to the right is the airflow rate and the second is the required diameter for a circular duct. The third column is the required cross-sectional area of the duct and the other columns to the left are rectangular ducts with sufficient cross-sectional area to handle the flow at the specified pressure drop. [For lengths of ductwork less than 100 ft., simply multiply 0.1 in. W.G. by the ratio of the actual duct length (in feet) over 100 ft. for the approximate pressure drop.] Use the supplier’s catalog for proper sizing of outlet air registers and return air grills to insure that they provide the required flow rate at the desired pressure drop.

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Contents OH6FA072DV4R OH6FA072DV4BOH6FA072DV4N OH6FX072DV4R Contents = Highboy D = Downflow = FrontSafety Section Page Codes and Clearances Combustible materialNon-combustible material II. General Instructions Read Before Start of Installation Type Model NO.1 From Sides Front Unit FurnaceHighboy OH6FA072D OH8FA119D TOP Sides of Plenum From Rear FLUE/VENTProper Chimney Size ChimneyPrevention of Chimney Condensing Proper Vent Connector PIPE/CHIMNEY Connection Proper Chimney HeightTight CLEAN-OUT Doors and Connections Tight JointsNo Interconnected Chimney Flues 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 Maximum Filter Type Air Velocity Model Number Ft/min Limit Position and LocationOH6 OH8 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 FeaturesSTOP! Read the safety information above Startup ProceduresOperating Instructions 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 Right Sign + AIR Damper AdjustmentTurn to the Left 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 Dealer Maintenance Safety During Servicing and InspectionGeneral Inspection Heat ExchangerHeat Exchanger Cleaning Instructions OH6 8FT OH8 8FT Filter maintenance procedure Electrical SystemSUPPLY/RETURN AIR Blower SUPPLY/RETURN AIR FilterExtended Appliance Shutdown Filter replacementOn Shutdown VI. HOMEOWNER/USER Information and Routine Maintenance On StartupPage Location of oil primary control reset button Beckett Burner Riello BurnerDiagnostics Diagnostic FeaturesCAD Cell Checkout Procedure 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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OH8FA119D60B, OH8FA119DV5B, OH6FX072DV4R, OH6FA072DV4N, OH6FA072D48N specifications

Thermo Products has established a reputation for delivering high-quality heating solutions tailored for various applications. Among their standout offerings are the OH8FA119DV5R, OH8FA119D60R, OH6FA072D48B, OH6FA072D48N, and OH6FA072DV4N models. These units are engineered with precision and incorporate advanced technologies to deliver reliable performance in residential and commercial settings.

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