Oil burner smoke test equipment, Bachrach Kit (C) Daniel FriedmanOil Burner Carbon Dioxide Test
How to Measure & Set Oil Burner CO2 Levels for Efficient Oil Burner Operation

  • OIL BURNER CO2 TEST - CONTENTS: Guide to oil burner operating tests: Bachrach or Bosch Kit Carbon Dioxide Level measurements for oil burners. How to measure oil burner CO2 level to evaluate system efficiency and operation. How to inspect & repair oil fired central hot water heating boilers or warm air furnaces
  • POST a QUESTION or READ FAQs about oil burner performance tests and measurements

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Oil burner carbon dioxide level testing, which in turn reflects combustion air & temperature adjustment is necessary for safe, efficient and reliable oil burner operation: this article explains and illustrates how an oil burner CO2 test is performed - a key step in oil burner adjustment.

An oil burner adjustment of combustion air, operating temperature, oil pressure, and other factors such as nozzle spray pattern selection all affect the completeness of combustion which in turn is reflected in the CO2 level measured in flue gas exhaust sampled in the breech. Page top image: the traditional Fyrite CO2 tester from a Bachrach oil burner tuning kit.

This article series answers most questions about central hot water heating system troubleshooting, inspection, diagnosis, and repairs. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects.

Green links show where you are. © Copyright 2017, All Rights Reserved.

Oil Burner CO2 Test - Carbon Dioxide Level Indicates System Efficiency

Oil burner smoke test equipment, Bachrach Kit (C) Daniel FriedmanIf the oil burner is not working, start your diagnosis at OIL BURNER INSPECTION & REPAIR.

[Click to enlarge any image]

The basic measurements made by any competent oil heat service technician include the stack temperature, draft, smoke level, and carbon dioxide level.

Along with OIL BURNER SMOKE TEST, the second common test performed by an oil heat technician evaluates the oil burner efficiency by measuring the carbon dioxide level or CO2 level in the oil burner exhaust.

While there are electronic sensors used by some technicians for this purpose, many oil heat service tech's continue to use the time-tested Bachrach Fyrite™ oil burner tester shown below.


Our photos show the rubber bulb and tubing used to pump oil burner exhaust gases into the CO2 level tester (the bulb and tubing atop the smoke tester, above left),

Oil burner smoke test equipment, Bachrach Kit (C) Daniel Friedman

and a closeup of a well-used CO2 tester (below).

Bachrach carbon dioxide test for oil burners (C) Daniel Friedman

Measurement is made at the same flue vent connector location as we discussed above.

Fyrite combustion analyzer II from Bachrach

Shown at left, a modern approach to measuring CO2 using the Fyrite II from Bachrach.

Watch out: if your heating oil company does not provide working test equipment for the service technician, setting the oil burner adjustments is going to be done by guesswork.

The result is likely to be either higher heating costs over the season for a system that is running too hot, or higher heating service costs for a system that runs too dirty.

In fact when the author (DF) attended oil burner school we were taught to make two openings into the flue so that smoke level and CO2 measurements could be made through one opening while a thermometer or draft gauge monitored those two additional data points at the second opening.

The Carbon Dioxide vs Oil Burner Efficiency chart below explains how the percent of carbon dioxide in oil burner exhaust gases translates into oil burner efficiency. Bachrach Fyrite instructions and Oil Burner efficiency chart below, source: Audel's Oil Burner Guide.

Audel guide to oil burner efficiency (C) Daniel Friedman - AudelThe chart at left illustrates combustion efficiency, stated as fuel loss at an oil burner, for a given CO2 level at different stack temperatures.

[Click any image or table to see an enlarged, detailed version.]

Watch out: It's easy to make it look as if oil burner has been set for very high efficiency: just stand with your leg blocking the air intake at the oil burner air shutter while making the CO2 measurement.

But that nonsense, while it may make the burner adjustment look "good" is likely to waste fuel during the heating season and may result in smoky sooty operation leading to a loss of heat.

We want good oil burner efficiency, up to the point of improper operation. The illustrations at left and below, from our Bachrach manual, explain how the Fyrite CO2 analyzer is operated and give a chart useful to read oil burner efficiency levels for different CO2 levels at different operating temperatures.

Combustion Analyzer Recommendations & Sources of Oil or Gas Burner Combustion Testing Kits include CO2 Measuring Devices

Oil burner smoke test equipment, Bachrach Kit (C) Daniel Friedman

UEI Eagle Test Instruments used to tune a gas fired heating boiler, Two Harbors MN (C) Daniel Friedman UEI Eagle Test Instruments used to tune a gas fired heating boiler, Two Harbors MN (C) Daniel Friedman

UEI Eagle produces a range of test instruments used for heating system analysis and tuning. Shown above, UEI Eagle test instruments, mounted magnetically to the service truck wall. These tools were used to measure the performance of an LP gas fired heating boiler in Two Harbors MN.

The second image above shows the Eagle test instrument report printed at the job site. [Click to enlarge any image]

Also see COMPLETE COMBUSTION, STOICHIOMETRIC for an explanation of complete fuel combustion and boiler or furnace maximum efficiency.

The articles at this website describe how to recognize common oil-fired heating appliance operating or safety defects, and how to save money on home heating costs.


There we explain an organized approach to inspecting the entire heating system, beginning outdoors, continuing indoors, and ultimately in most detail in the boiler or furnace room.

Oil burner smoke test equipment, Bachrach Kit (C) Daniel Friedman


Continue reading at OIL BURNER WONT RUN or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.





Suggested citation for this web page

OIL BURNER CO2 TEST at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia


Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

Ask a Question or Search InspectApedia

Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Search the InspectApedia website

Comment Box is loading comments...

Technical Reviewers & References

Click to Show or Hide Citations & References

Publisher's Google+ Page by Daniel Friedman