(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 8 of 8

Thread: Fire rate in a furnace

  1. #1
    DIY Junior Member
    Join Date
    Jun 2009
    Location
    New Jersey
    Posts
    16

    Default Fire rate in a furnace

    Just curious, was talking to a HVAC guy at work and he mentioned there is a way to make the flame higher in a gas furnace. When I heard this, I thought he was crazy. I had thought the gas burner were all firing at a steady rate and only the fan speed ajustment allows you to feel the difference in heat coming out of the registery.

    He mentioned you can ajust the flame level like you do on a hot gas water heater. Is this true???

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
    Join Date
    Jan 2008
    Location
    Land of Cheese
    Posts
    3,142

    Default

    There may be a way to adjust the fuel/air mixture, but this is not for adjusting the amount of heat.

  3. #3
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    THe air/fuel mix can be adjusted for optimum efficiency and minimum emissions. I think changing the regulated gas pressure for a bigger flame is asking for trouble. THe burner is rated at X many BTU. Trying to coax more out can cause problems.

  4. #4
    DIY Junior Member
    Join Date
    Jun 2009
    Location
    New Jersey
    Posts
    16

    Default

    Oh I absolutely wouldn't try to adjust the flame level. I was curious after listen to the HVAC guy talking earlier today at work. I know my gas hot water tank, there is a lever at the bottom where I can adjust how warm I want my water coming out of the faucet. I can adjust betwen VACATION, MEDIUM WARM, high WARM, HOT, and MAX. Mine is set at high warm. And just wonder if same can be done on the furnace as you can do it on a gas stove.

  5. #5
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    OK, that is a different question. I do not know of any way to do that with your existing furnace. Today's very high efficiency models have what is often called a multi-stage burner. I think in most cases there are groups of burners, and they use switching at the gas valve to use one or more burners as necessary. For example, in the am, after the night setback, all burners might come on to quicly get the house warmed up. Then one or more groups would be switched off, using just a smaller amount of fuel to keep the house warm. Oftern you will see variable speed blowers used in such a system.

    If you are in a very cold climate, with high fuel costs, it might pay to look at investing in a new furnace. Otherwise, just wait until this one wears out

  6. #6
    DIY Senior Member Rich B's Avatar
    Join Date
    Sep 2008
    Location
    New Jersey
    Posts
    282

    Default

    My Rheem furnace has a 2 stage burner. It has a 2 stage gas valve........This is not adjustable other than for efficiency of the flame. My furnace can be controlled by a 2 stage T-stat or a 1 stage T-stat. It runs the burners rate of fire by way of the PC Logic board. I have it controlled with a 1 stage T-stat mostly because I never got around to installing a 2 stage t-stat yet. It runs at low fire for a set amount of time.......8 minutes I think it is.....if the t-stat is not satisfied by then it goes to high fire and runs at high fire untill the heat call is satisfied. If it has a 2 stage t-stat it changes the timing sequencing of the fire rating.......I would not mess with the burner adjustment.....get someone from the gas company....they can adjust it and check to make sure it is burning efficiently.........

    My old gas furnace was 20+ years old and I never touched it other than changing filters and clean it out of any dirt or debris in there.

    My new one is about 5 years old.....same deal...

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,390

    Default

    The wh knob is a thermostat. No effect on the flame size, just duration.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  8. #8
    DIY Junior Member
    Join Date
    Jun 2009
    Location
    New Jersey
    Posts
    16

    Default

    I see. thanks!

Similar Threads

  1. GPM rate explanations?
    By WellHead in forum Pumps and Tanks Well Forum & Blog
    Replies: 4
    Last Post: 10-21-2010, 10:25 AM
  2. Well recovery rate
    By estone in forum Pumps and Tanks Well Forum & Blog
    Replies: 14
    Last Post: 10-27-2009, 11:32 AM
  3. Flat Rate or T&M?
    By D'Brie in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 10-02-2009, 07:59 AM
  4. Low rate, looking for recommendations
    By SSWremodel in forum Pumps and Tanks Well Forum & Blog
    Replies: 5
    Last Post: 07-08-2009, 10:15 AM
  5. Low flow rate
    By Luther in forum Pumps and Tanks Well Forum & Blog
    Replies: 2
    Last Post: 06-24-2007, 07:04 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •