Thermo Products OHFA199DV5R, OHFA199DV5B operation manual Supply air duct sizing Example

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Table 3: Suggested Duct Sizes for Homes, Quiet Offices, Or Similar Installations

(Based on a 0.1 in. W.G. static pressure drop per 100 ft. of duct.)

7.The supply and return air ducts, or flexible joints, should be carefully secured and sealed to the appliance housing to prevent air leakage from, or into, the duct system. For best performance, insulate the outside surfaces of the ducts to reduce heat loss from, or heat gain to, the ducts.

8.As a final step in the installation, the appliance must be adjusted to deliver a temperature rise within the range of 50° to 80°F. Adjust the blower motor speed to obtain a temperature rise within the acceptable range. The required blower speed will depend on the airflow resistance of a supply and return air duct systems.

Fig. 9: Supply air duct sizing Example

The RETURN AIR DUCT SYSTEM should equal the warm air duct system in airflow capabilities.

NOTE: When a return register is located in the same room as the furnace, the register must be at least 20 feet away from the furnace.

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Contents OH6FA072DV4N OH6FX072DV4R OH6FA072DV4BOH6FA072DV4R Contents = Front = Highboy D = DownflowCAUTION do not Attempt to Start the Burner When Safety SectionWARNING and Cautions Page Combustible material Codes and ClearancesNon-combustible material Highboy II. General Instructions Read Before Start of InstallationPrevention of Chimney Condensing ChimneyProper Chimney Height Proper Vent Connector PIPE/CHIMNEY ConnectionTight Joints Tight CLEAN-OUT Doors and ConnectionsNo Interconnected Chimney Flues Flue Pipe CLEARANCES, Sizing and TypeReduction of Clearances with Specified Forms of Protection Venting Airflow Requirements and Sizing of Duct Work Draft RegulatorsDuct WORK/AIR Conditioning Page Page Supply air duct sizing Example Examples Air Filter Mounted External to FurnaceA typical filter rack and dimensions for the OH6 furnace OH6 OH8 Limit Position and LocationMaximum Filter Type Air Velocity Model Number Ft/min Do not remove this retainer when installing burner Burner InstallationDo not Change Position of the Chamber Burner Specifications and ApplicationsBTU/HR Beckett RielloBTU/HR Heating Capacity Mounting the 2-STAGE Riello BurnerOIL Tank and Piping Electrical Wiriing OIL FilterOH8FA119DV5 Electronic Air Cleaner EAC and Humidifier InstallationOH6FA072DV5 Fan Control Module Thermostat Anticipator SettingHeat Anticipator Adjustment Scale Preferred method of adjustmentBlower Motor Speed Selection OH6FA072DV4 Heating Speed Set-upsFurnace Motor Current Draw Amps/ / Watts vs1A ECM blower motor speed chart OH6FX072DV4 Heating Speed Set-ups 2 StageCooling blower motor speed chart Draw Amps/Watts vs Cooling Speed Set-upsHigh OH6FA072D48HTG Speed by Input Blower Controller Information for PSC Motor Terminal Definitions & Field WiringOutputs InputsOperating Modes On and OFF Blower Delay Time Switch Settings Diagnostic Features PSC Trouble ShootingOperating Instructions Startup ProceduresSTOP! Read the safety information above To Turn Off Oil to Appliance Adjustment of Burner CombustionPreliminary Adjustment of Burner Air Band and Air Shutter Combustion Head Setting for 2-STAGE Riello BurnerTurn to the Left Sign AIR Damper AdjustmentTurn to the Right Sign + 2nd Stage Adjustment 1st Stage AdjustmentAdjustment Of Heat Input Rate Page Checkout Procedure  Caution do not Attempt to Make Repairs Yourself III. Users Information SectionInspection Areas Starting the Burner Filter Cleaning and LocationIV. Installers Instructions to User General Inspection Dealer MaintenanceSafety During Servicing and Inspection Heat Exchanger OH6 8FT OH8 8FT Electrical System Filter maintenance procedureSUPPLY/RETURN AIR Blower SUPPLY/RETURN AIR FilterOn Shutdown Filter replacementExtended Appliance Shutdown On Startup VI. HOMEOWNER/USER Information and Routine MaintenanceBeckett Burner Location of oil primary control reset buttonPage Diagnostic Features DiagnosticsCAD 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