Olsen BML-80B2 - User Manual

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BML

(Lowboy Model)

BMLV

(Lowboy Model with ECM)

Series B

Oil Fired Warm Air Furnaces

INSTALLATION, OPERATION & MAINTENANCE MANUAL

P/N 30149, Rev. G [12/15/2016]

ECR International

2210 Dwyer Avenue, Utica NY 13501

web site: www.ecrinternational.com

Main Page

Questions and Answers

J
jriveraNov 24, 2025
What causes excessive fuel oil consumption in my Olsen BML-80B2?
- V
  Vicki RoyNov 24, 2025
  Excessive fuel oil consumption in your Olsen Furnace can stem from several factors: * System temperature rise being too high: The system temperature rise should not exceed 75°F. Check for clogged air filters and dirt buildup on the blower fan. If necessary, increase the blower fan speed. * Poor “fan off” delay timing: The fan may be stopping too soon. Check the “fan off” delay timing setting, using a duct thermometer to ensure the fan shuts off at 90° - 100°F. Adjust the dip switch settings to achieve this temperature. * Fuel oil leak: Inspect the fuel oil line for leaks and repair or replace it if necessary. * Stack temperature being too high: Stack temperatures should typically range from 400° to 500°F. Check the draft regulator, ensuring it's set to -0.02 in. w.c. * Improperl...
J
Joseph IbarraNov 26, 2025
How to fix an Olsen BML-80B2 that will not warm home to desired temperature?
- A
  Abigail MartinNov 27, 2025
  If your Olsen furnace isn't adequately warming your home, consider these potential causes: * Blocked airflow or a dirty air filter: Clean or replace the air filter. * Thermostat adjustments or location: Ensure the thermostat's heat anticipator setting aligns with the measured amperage draw, increasing it if necessary. Relocate the thermostat if it's affected by drafts, sunlight, or ductwork. * Insufficient airflow: Check all dampers, opening any that are closed, including registers in unused rooms. Verify the system temperature rise; if it's too high, increase the blower fan speed. * Defective high limit control: Test the high limit function of all limit switches, using a duct thermometer to verify the limit control's accuracy. Check for airflow obstructions around the limit switc...

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