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Rheem OBF Series User Manual

Rheem OBF Series
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92-22876-27-00
ISO 9001:2000
INSTALLATION INSTRUCTIONS
FOR (-)OBF UPFLOW OIL FIRED FURNACES
Do not store or use gasoline or other flammable vapors and liquids, or other
combustible materials in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL FUEL OIL VAPORS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your fuel oil supplier from a neighbor’s phone. Follow the fuel
oil supplier’s instructions.
If you cannot reach your fuel oil supplier, call the fire department.
Do not return to your home until authorized by the fuel oil supplier or
fire department.
DO NOT RELY ON SMELL ALONE TO DETECT LEAKS. DUE TO VARIOUS
FACTORS, YOU MAY NOT BE ABLE TO SMELL FUEL GASES.
U.L. recognized fuel gas and CO detectors are recommended in all applications,
and their installation should be in accordance with the manufacturer’s
recommendations and/or local laws, rules, regulations, or customs
Improper installation, adjustment, alteration, service or maintenance can cause
injury, property damage or death. Refer to this manual. Installation and service must
be performed by a qualified installer, service agency or the fuel oil supplier.
IMPORTANT: Do not use a power-
robbing electronic thermostat with
this furnace. Use only mechanical
thermostats or battery powered
electronic thermostats.
U.L. recognized fuel gas and CO (carbon monoxide) detectors are recommended in
all applications, and their installation should be in accordance with the
manufacturer’s recommendations and/or local laws, rules, regulations, or customs.
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Rheem OBF Series Specifications

General IconGeneral
BrandRheem
ModelOBF Series
CategoryFurnace
LanguageEnglish

Summary

SAFETY RULES

General Safety Warnings

Crucial safety precautions for furnace operation and installation, including warnings about water damage and fuel type.

Proposition 65 Warnings

Information on California's Proposition 65 chemical warnings related to furnace materials and emissions.

LOCATION AND CLEARANCES

Helpful Installation Information

References to national standards like NFPA for proper furnace installation.

Dimensions and Clearances

Diagrams and tables detailing required clearances to combustibles for furnace installation.

SELECTING NOZZLE SIZE

Nozzle Change Caution

Emphasizes that nozzle changes and input rate determination should only be done by qualified technicians.

INSTALLATION INSTRUCTIONS

Installation Requirements

Outlines standards and warnings for proper furnace installation and operation.

Location and Air Supply

Details furnace placement, combustion air, and ventilation requirements.

CIRCULATING AIR SUPPLY

FLUE AND CHIMNEY EXHAUST

Chimney Size Recommendations

Table providing recommended chimney sizes based on BTU input for safe venting.

Venting Requirements

Guidelines for properly venting flue gases through a chimney or flue.

BAROMETRIC DRAFT CONTROL

OIL BURNER / PRIMARY CONTROL

TANK AND OIL LINES

Single and Dual Oil Filtration

Recommendations for oil filter types and placement to prevent nozzle clogging.

ELECTRIC WIRING

Ground Connection

Importance of permanent cabinet grounding before making electrical connections.

THERMOSTAT

Power Robbing Thermostats

Warning against using power-robbing thermostats due to potential intermittent operation.

TYPICAL INSTALLATION DIAGRAMS

OPERATING INSTRUCTIONS

Lighting Instructions

Procedure for starting the furnace, including safety warnings.

Furnace Start-up and Stop

Steps for initiating and terminating furnace operation.

Burner Start-up Issues

Troubleshooting steps if the burner fails to start or operate correctly.

FURNACE ADJUSTMENT

Oil Burner Adjustment

Detailed procedure for adjusting the oil burner for optimal performance and emissions.

Preparation Steps

Steps required before performing burner adjustments, including calibration and drilling holes.

COMBUSTION ADJUSTMENT

Combustion Diagnosis

Guidance on evaluating combustion performance using CO2 and smoke readings.

FINAL CHECKS

OIL PUMP AND BLEEDING

Checking Pump Pressure

Procedure for testing and adjusting oil pump pressure using a pressure gauge assembly.

Pump Selection and Usage

Information on selecting the correct oil pump, including two-stage options.

ELECTRODE ADJUSTMENT

Electrode and Nozzle Positioning

Steps for correctly positioning electrodes and the nozzle using a gauge.

Air Volume Adjustments

How air volume is affected by ductwork and how blower speed can be changed.

SUPPLY AIR TEMPERATURE

Temperature Rise Issues

Troubleshooting for high or low temperature rise and their causes.

TRUE-SPOT SMOKE TESTER

Smoke Scale Readings

How to interpret smoke readings using the Bacharach smoke scale.

Better Smoke Reading Tips

Advice for obtaining accurate smoke readings.

FAN/LIMIT CONTROL

MAINTENANCE

Burner Maintenance

Annual replacement of nozzle and periodic cleaning of electrodes and filters.

Lubrication and Cleaning

Instructions regarding blower motor lubrication and cleaning to prevent overheating.

Air Filter Requirements

Guidelines on filter placement, cleaning, and replacement to ensure proper airflow.

POOR CHIMNEY DRAFT CONDITIONS

Causes and Corrections

Lists common causes of poor chimney draft and their corresponding corrective actions.

OIL BURNER DATA

TROUBLESHOOTING

Odor, Soot, Smoky Fire

Checks for issues causing smoke, soot, or odors, often related to combustion or draft.

Delayed Ignition

Potential causes for delayed ignition, including electrodes and fuel supply.

Burner Operational Issues

Troubleshooting steps for when the burner does not operate or the motor runs without firing.

Pulsations

Identifies causes of burner pulsations, such as improper nozzle or air supply.

ADDITIONAL TROUBLESHOOTING

Cad Cell Functionality

Checks for proper operation of the flame sensor (cad cell) and potential interference.

Low CO2 and High Temperatures

Diagnosing issues related to low CO2 levels or high stack temperatures.

OIL PUMP PRESSURE PROBLEMS

Excessive Pressure Issues

Possible causes for oil pump pressure being too high.

Insufficient Pressure Issues

Potential causes for oil pump pressure being too low.

Fluctuating or No Pressure

Troubleshooting for inconsistent or absent oil pump pressure.

FURNACE ADJUSTMENT CHECK SHEET

HEATING AND COOLING SCHEMATIC

CONTINUOUS LOW SPEED BLOWER SCHEMATIC

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