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  1. #14
    Join Date
    Sep 2003
    Location
    Ocean County, N.J.
    Posts
    464
    Thanks RoBo and hvac-tech-lane. I wasn't going to post, but now I'm glad I did. Always eager to learn. Thanks.

  2. #15
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    i normaly go high on the pleanum in line or as close to the main trunk take off
    even still why are you getting a 40 degree differance in only a few feet

    robo has a point 5 degrees from point a to regs



  3. #16
    Originally posted by deejoe
    To actually arrive at a true "temp rise" of a forced air furnace where is the supply temp taken?


  4. #17
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    For the supply, I agree with that diagram. For the return, I prefer being closer to the blower, especially if there is a filter near the blower where air leakage into that area could change the average temperature hitting the heat exchanger.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  5. #18
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Sometimes, for simply unknown reasons, we will hit hot of cool spots in the plenum or ducting. What it would take to pinpoint the reason for the hot/cold spot is just not worth the time or effort in the field.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


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