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Type: Posts; User: Jim Davis

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  1. Replies
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    Leaky return duct can also cause a change. It is...

    Leaky return duct can also cause a change. It is CO that kills people not O2. That is the reading to be concerned with. Induced draft furnaces have large holes in the heat exchanger. That is...
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    #45 orifices are 17,072 btus with 1030 btus per...

    #45 orifices are 17,072 btus with 1030 btus per cubic foot gas.. You might be a little over concerned about the CO. Starting your vehicle in the morning one time may produce more CO than your...
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    Is your flue 2-pipe? It sounds like it might be...

    Is your flue 2-pipe? It sounds like it might be too restrictive. With the O2 low and the temperature low it sounds more like the inducer isn't doing its job.
  4. Combustion produces CO2. CO2 displaces O2. If...

    Combustion produces CO2. CO2 displaces O2. If the doors are closed the CO2 will not freely escape and the O2 will drop causing Carbon monoxide to be produced. The Oxygen depletion switch will not...
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    Something I learned a long time ago is that 130...

    Something I learned a long time ago is that 130 degrees at 5000 feet altitude is the same as it is at sea level. The air is less dense but temperatures don't change.
    The btus is gas varies at all...
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    NCI now offers high temperature silicone plugs...

    NCI now offers high temperature silicone plugs rated up to 600 degrees. I believe they are less expensive than the Bacharach plugs. They can be used in B-vent and PVC.

    What is the function of...
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    You might try Field Controls new UV lights. Not...

    You might try Field Controls new UV lights. Not sure why or how someone new their UV light was putting out ozone? Unless you are super sensitive to ozone, or peanuts or gluten you should avoid it. ...
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    sorry, never worked on leak detectors.

    sorry, never worked on leak detectors.
  9. Replies
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    Randy is also correct!! Beside I might be...

    Randy is also correct!! Beside I might be getting old and forgetful. Plus I need more bathroom breaks.
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    Ken is absolutely correct. I helped pick and...

    Ken is absolutely correct. I helped pick and train all the other combustion instructors. In many cases they are better than me, just not as goofy.
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    I believe we have another class scheduled at our...

    I believe we have another class scheduled at our office in Sheffield Lake December. 17,18 & 19. However I will be teaching in PA that week.

    Yes, the Bacharach Intech is all you need, with a case...
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    I believe a copy of the combustion test should be...

    I believe a copy of the combustion test should be kept in a file at the office but if left with the equipment it can be misinterpreted.
    Especially if people think the efficiency number is correct.
    ...
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    rundawg has it correct. Need O2 and Flue T...

    rundawg has it correct. Need O2 and Flue T readings also. Plus is the 600 ppm the whole time or is it rising.

    If you are lucky and I am lucky, I will be teaching in Glen Burnie, MD Nov. 19,20 &...
  14. Piping and pumping have a lot to do with how the...

    Piping and pumping have a lot to do with how the boilers should run. If water is circulating through an idle boiler it will become a cooling chamber and increase fuel usage. The differential should...
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    Using Beckets own combustion numbers the amount...

    Using Beckets own combustion numbers the amount that I have calculated is 3500 cu.ft.. per gallon, assuming the room is air tight.
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    Think about what we are taught or what is listed...

    Think about what we are taught or what is listed in most manuals and the Code.

    1 sq in. area per 4000 btus if you get the air from a grill to outside.
    1 sq.in. area per 1000 btus if you get the...
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    In 2000 ASHRAE did a combustion air study and...

    In 2000 ASHRAE did a combustion air study and stated that the 50 cu. ft. of air per 1000 btus was just made up and not based on any actual combustion knowledge. They also stated that passive...
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    10 to 12 years ago I was working with the head...

    10 to 12 years ago I was working with the head engineer at Field Controls (no longer there) and ask for a probe type limit for plastic flues at 140 degrees and one for B-vent at 550 degrees. They...
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    If you are venting into Schedule 40 PVC the flue...

    If you are venting into Schedule 40 PVC the flue temperature cannot exceed 140 degrees or the pipe will separate. When a water heater scales up the flue temperature can get much higher. The limit...
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    Most gas leak detectors are temperature...

    Most gas leak detectors are temperature sensitive. They will react to changes in temperature alone.
  21. In reality you are less likely to condense in 6"...

    In reality you are less likely to condense in 6" B-vent than in 5".
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    The correct answer, which seems like the dumbest...

    The correct answer, which seems like the dumbest answer, is that the flue is to short. There was a reason manufacturers provided intake restrictors years ago. Now we have to wing it on our own.
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    As I learned over 30 years ago, if you don't...

    As I learned over 30 years ago, if you don't measure CO on oil you are asking for trouble. CO2 and smoke readings do not tell the whole story. Seems like forever techs have said that oil is dirty...
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    As with most energy devices or programs the...

    As with most energy devices or programs the savings are deemed not verified. In the 80's there was a product called a Furnace Brain that duty cycled furnaces. It had a mild weather setting and a...
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    You are confusing CO with CO2. I stated that by...

    You are confusing CO with CO2. I stated that by measuring CO (carbon monoxide) at Shut-Down will give you a good idea on whether you have after-drip or impingement. Measuring CO at Light-Off and...
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    I worked with a HVAC wholesaler for 15 years ...

    I worked with a HVAC wholesaler for 15 years that rebuilt Sunstrand and Webster oil pumps. We had a test bench so I could play with different things. We sprayed into a clear glass container so we...
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    I recommend it if you don't want after drip. The...

    I recommend it if you don't want after drip. The information on outgassing is very small at the bottom of a page.
  28. Replies
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    Outgassing the oil cartridge or filter has been...

    Outgassing the oil cartridge or filter has been written in the Sundstrand/Suntec Field Handbook for 40 years or more, It discusses after you do your normal purge to close off the tank valve and pull...
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    Adams Mfg from Cleveland Ohio still makes...

    Adams Mfg from Cleveland Ohio still makes furnaces up to 1,000,000 btus. They are tanks!
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    Is the furnace running when you detect gas in the...

    Is the furnace running when you detect gas in the flue? Any chance there is some type of battery charger in the house?
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    Every time you change the nozzle or filter you...

    Every time you change the nozzle or filter you put air in the system. This can take up to a week or more to purge, unless you know how to outgas the filter. Also, 2-line systems are famous for...
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    Fieldpiece does not make a natural gas leak...

    Fieldpiece does not make a natural gas leak detector. What is the model #?
  33. Replies
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    How do you know you have afterdrip versus...

    How do you know you have afterdrip versus impingement? Also, oil burners are supposed to be slightly down hill.
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    How did you measure gas in the flue? What...

    How did you measure gas in the flue? What testers are you using?
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    A short flue will give a higher than normal flue...

    A short flue will give a higher than normal flue temperature. You need a ball valve in the intake. The temperature rise is most likely caused by poor airflow. If you restrict the intake the...
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    You can only measure approximately how many btus...

    You can only measure approximately how many btus you are making, not how many it takes to make them. Volume of fuel rarely gives you actual btus.. You set up equipment to deliver its rated output...
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    I get to keep $4.00 dollars of it.:)

    I get to keep $4.00 dollars of it.:)
  38. Replies
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    The GPM should be based on the actual input (air)...

    The GPM should be based on the actual input (air) or output (water) By adjusting the CFN or GPM and measuring flue temperature and Delta T it can be approximated as close as possible. Or you can buy...
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    Plus I want to torture you with as much bad humor...

    Plus I want to torture you with as much bad humor as possible!!
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    Well maybe a 1/10 of one.

    Well maybe a 1/10 of one.
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    How do you determine the btus on commercial...

    How do you determine the btus on commercial equipment when you can't clock the meter? What about LP?
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    The monitors or alarms for hydrogen sulfide are 0...

    The monitors or alarms for hydrogen sulfide are 0 - 25 ppm. Not sure what the actual code might be.
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    Just had a tech on a CO call and the batteries...

    Just had a tech on a CO call and the batteries from the sump pump were producing hydrogen sulfide and reading on the CO analyzer.
  44. I just moved back to Cincy which is my hometown. ...

    I just moved back to Cincy which is my hometown. I will be knocking on some of my old customers doors and find out why they don't care anymore. My daughter bought a condo here and I ask her to have...
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    The temperature rise on that furnace should be...

    The temperature rise on that furnace should be between 62 degrees to 72 degrees regardless of what the manufacturer states. The blower cfm should be 1300 cfm. If you go by the manufactures specs...
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    Somehow manufacturers don't believe airflow has...

    Somehow manufacturers don't believe airflow has anything to do with heat transfer. The fact of this situation is that the air is moving too fast and cannot remove heat from the heat exchanger...
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    Yes icy, CO is heavier than air below 32 degrees....

    Yes icy, CO is heavier than air below 32 degrees. Therefore if you install your CO Alarm outdoors it should be low. :)
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    CO2 is heavier than air not CO. CO has a...

    CO2 is heavier than air not CO. CO has a molecular weight of 28, O2 is 32.
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    I am scheduled to teach in Baltimore the first...

    I am scheduled to teach in Baltimore the first week of Dec. People that still think blue flames are safe and clean still rub me the wrong way. I think it is too new for anyone to have any useful...
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    I recommend Bacharach. The Intech is all you...

    I recommend Bacharach. The Intech is all you really need. The draft tester on most analyzers is useless because draft needs to be measured simultaneously with combustion. Plus they are not visual...
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