Olsen BML-80B2 - User Manual

Questions and Answers

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amanda21Aug 30, 2025
Why is my Olsen oil burner sputtering at the nozzle?
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  Dylan BentonAug 30, 2025
  If your Olsen oil burner is sputtering at the nozzle, it could be due to: * Electrodes out of adjustment or defective: Check the electrode settings and inspect the electrodes for dirt build-up or cracks in the porcelain. * Poor igniter connections or a defective igniter: Check the contacts between the igniter and electrodes. If they're okay, replace the igniter. * A clogged fuel oil filter: Replace the fuel oil storage tank filter and/or the fuel oil in-line filter. * A defective oil pump: Check the burner motor and/or the fuel oil pump coupling. Check the oil pump pressure and replace the fuel oil pump if necessary. * A fuel oil line that is partially clogged or contains air: Bleed air from the oil line. If the problem persists, replace the oil line.
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Richard SloanSep 2, 2025
What causes soot to build up on the blast tube (end coning) in my Olsen Furnace?
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  Christina MackSep 2, 2025
  Soot buildup on the blast tube (end coning) in your Olsen furnace can be caused by: * Poor alignment between the oil burner blast tube and the fire pot: Check the alignment. The blast tube should be centered with the fire pot burner opening, and the oil burner head should be ¼ inch back from the inside surface of the fire pot. * Flame impingement caused by an incorrect nozzle angle: Check the nozzle size and angle and the distance from the head to the inside surface of the fire pot. * A defective fire-pot: Check the fire-pot and repair or replace it if necessary.
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Amber WaltersSep 4, 2025
Why is there too much smoke coming from my Olsen Furnace?
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  Michael AlvarezSep 4, 2025
  Excessive smoke from your Olsen Furnace can be attributed to: * Insufficient combustion air adjustment at the oil burner or improper draft pressure: Adjust the oil burner combustion air band and draft regulator to achieve the highest practical CO2 or lowest practical O2 content in the flue gases. Refer to the Burner Set Up. * A heat exchanger that is partially clogged: Check for soot buildup in the heat exchanger flue passages, particularly in the outer radiator.
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youngjenniferSep 7, 2025
Why is the supply air temperature from my Olsen BML-80B2 Furnace too cool during the first moments of the furnace cycle?
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  Kimberly GraySep 7, 2025
  If the supply air temperature is too cool at the start of your Olsen Furnace cycle, it could be due to: * A fan control "fan on" setting that is too low: Increase the "fan on” dipswitch settings if your control has this option. Register air deflectors may also help. * Excessive duct losses: Check the supply air ductwork. Seal any leaky joints and seams, and insulate the ductwork if necessary.
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Heather WilkersonSep 9, 2025
Why is the supply air temperature from my Olsen BML-80B2 Furnace too hot?
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  frederick22Sep 9, 2025
  If the supply air temperature from your Olsen Furnace is too hot, it could be due to: * Airflow blockage or a dirty air filter: Clean or replace the air filter. * Insufficient airflow: Check all dampers, opening any closed ones, including registers in unused rooms. Also, check the system temperature rise; if it's too high, increase the blower fan speed.
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Joshua FloresSep 12, 2025
Why is the supply air temperature from my Olsen Furnace too cool?
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  Kelly SanchezSep 12, 2025
  If the supply air temperature from your Olsen Furnace is too cool, it might be because of: * Excess airflow: Check the system temperature rise and slow down the blower fan if necessary. * Excessive duct losses: Inspect the supply air ductwork, sealing any leaky joints and seams. Insulate the ductwork if needed.
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Laura JonesSep 14, 2025
Why doesn't my home heat evenly with my Olsen BML-80B2 Furnace?
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  Michael HigginsSep 14, 2025
  The manual indicates that uneven heating is not likely a furnace problem. The suggested solution is to balance the duct system.
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Emily JordanNov 17, 2025
What to do if my Olsen BML-80B2 Furnace starts, but cuts out and requires re-setting the oil protector reset button?
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  emilyhernandezNov 17, 2025
  If your Olsen furnace starts but then cuts out, requiring you to manually reset the oil protector, it could be due to several reasons: * A defective Photo Cell (Cad Cell): If the cad cell is dirty, clean it and determine why it's getting dirty. If it's poorly aimed, realign it. Ensure room light isn't leaking into the cad cell compartment. A functional photocell should have a resistance of approximately 100 Kiloohms in darkness and a maximum of 1500 Ohms when exposed to light. * No fuel oil: Check the fuel oil supply and ensure all hand-operated fuel oil valves are open. Refill the oil storage tank if needed. * A clogged nozzle: Replace the nozzle with a high-quality replacement, consulting the rating plate or relevant tables for guidance. * A clogged oil filter: Replace the oil t...
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ashley34Nov 19, 2025
What should I do if my Olsen Furnace will not start without pushing the oil primary control reset button frequently?
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  Rhonda ChenNov 19, 2025
  If your Olsen Furnace requires frequent resetting of the oil primary control reset button to start, consider the following: * Check the fuel oil supply: Make sure that all hand operated fuel oil valves are in open position and fill the oil storage tank if necessary. * Clogged nozzle: Replace the nozzle with high quality replacement. Use rating plate or Tables in Appendix A as a guide. * Clogged oil filter: Replace oil tank filter or in-line filter if used. * Low oil pump pressure: Connect pressure gauge to oil pump. Adjust pump pressure, or replace oil pump if necessary. Verify erratic pressure readings are not caused by defective fuel oil line. * Air getting into fuel oil lines, or fuel oil line dirty, clogged, or in some manner defective: Check fuel oil lines. Replace any comp...
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Amanda BrownNov 21, 2025
Why won't my Olsen Furnace start?
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  shafferstevenNov 22, 2025
  Several factors can prevent your Olsen Furnace from starting. It could be due to: * The thermostat not calling for heat: In this case, check and adjust the thermostat, ensuring it's level if it's a mercury switch type. * Lack of power to the furnace: Verify the furnace switch, main electrical panel fuse, or circuit breaker. Also, check for any other hand-operated switches. * A faulty thermostat: You can remove the thermostat wires from the oil primary control terminals (T-T) and place a jumper across them. If the furnace starts, replace the thermostat or its sub-base. * A faulty oil primary control: Check the reset button on the oil primary control. Remove the thermostat wires from the T-T terminals and check for 24V across them. If there's no voltage, check for 115V to the oil pr...

Summary

Safety Symbols

Ventilation Controls and Electrical

Circulating Air Blower Systems

Blower System Types (BML;BMLV)

Circulating Air Blower (BMLV)

ECM Blower Speed and Timing Settings

Maintenance and Service

Annual Service By Contractor

Tasks for professional servicing, including cleaning and safety control checks.

Operating Instructions (BML)

Operating Instructions (BMLV)

Appendix A: Checkout and Adjustments

Oil Burner Set-Up Charts

Provides setup data for Beckett AF and AFII oil burners.

Appendix A: Checkout and Adjustments (Continued)

Riello Oil Burner Set-Up

Provides setup data for Riello 40F and 40BF oil burners.

Burner Electrode Adjustment

Details on electrode gap and positioning for Beckett and Riello burners.

Final Check Out Procedures

Verifying safety devices, electrical connections, and homeowner information.

PSC Motor Blower Set-Up

Direct drive PSC motor setup and airflow characteristics.

ECM Blower Dip Switch Settings

Chart for adjusting ECM blower speed, cooling, and delay settings.

Belt Drive ECM Blower Set-Up

Table for ECM blower setup with belt drive pulley and motor details.

Oil Burner Air Adjustment

Instructions for adjusting air supply for Beckett and Riello oil burners.

Start Up Procedures

Step-by-step instructions for starting up the furnace and burner.

ECM Motor Blower Set-Up

Direct drive ECM motor setup and airflow characteristics.

Belt Drive Airflow Characteristics

System Temperature Rise Check

How to check and adjust airflow based on system temperature rise.

Appendix B: Wiring Diagrams

Chimney Vent Furnace Wiring Diagram (BML;BMLV)

Appendix B: Wiring Diagrams (Continued)

Direct Vent Furnace Wiring Diagram (BML;BMLV)

Appendix C: Sequence of Operation and Troubleshooting

Electronic Fan Timer Sequence of Operation (BML)

ECM Fan Timer Sequence of Operation (BMLV)

Appendix C: Sequence of Operation and Troubleshooting (Continued)

Troubleshooting Preliminary Steps

Checking Oil Primary Control

Appendix C: System and General Troubleshooting

Furnace Will Not Start Troubleshooting

Furnace Will Not Start Without Reset Troubleshooting

Appendix C: System and General Troubleshooting (Continued)

Oil Burner Sputtering and Excessive Fuel Consumption

Furnace Not Warming Home and Uneven Heating

Supply Air Temperature Issues

Appendix D: Homeowners Reference Table

Parts Listing: Chimney Vent Models

Parts for BML80;BMLV80 (B2,BRF2)

Parts Listing: Chimney Vent Models (Continued)

Blower Assemblies and Components

Filter and Venting Components

Parts Listing: Direct Vent Models

Parts for BML80;BMLV80 (BB2 U2,BRBU2)

Model BML and BMLV Diagram

Olsen BML-80B2 Specifications

General

Model	BML-80B2
Chamber Volume	8 Liters
Power Consumption	2.5 kW
Thermal Insulation	Ceramic Fiber
Category	Furnace
Type	Laboratory Furnace
Power Supply	220V, 50/60 Hz
Temperature Control	PID Controller
Temperature Sensor	Type K thermocouple