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  1. isolate central exhaust from central air

    hello

    I am just learning the residential hvac trade. when new homes are built where i live, a central exhaust fan collects all stale air from house and vents it. code dictates that when the...
  2. isolate central exhaust from central air

    hello

    i would like to know if someone could shoot me a schematic to allow central exhaust to work independantly from the central air unit.

    i believe that when the cent exhst comes on, it...
  3. sheet metal fabrication instructional book/video

    hello;

    i work in the residential industry as a service tech and i am moving into learning installations of furnaces, ac, etc.

    i am looking for an easy to follow book for learning sheet metal...
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    resources

    HELLO

    i am looking for a really good training book resource for troubleshooting furnaces and their repairs

    any recommendations?

    thanks
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    522

    product issues

    I was wondering if other than the manufacturer websites if anyone knows

    if of a site that would allow me to find out product known issues for furnaces and ac. for the various brand names and...
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    4
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    688

    air conditioning troubleshooting

    Hello:

    I was wondering if anyone can clarify for me what happens in certain situations with refrigerant for things like subcooling, superheat, and approach.

    I read books etc but beyond knowing...
  7. Replies
    6
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    2,240

    anticipators

    hello:

    I have trouble picturing schematically how heat/cool anticipators work.

    I know heat turns of prematurely, cool turns on prematurely, but if the resistors are loads, how does their power...
  8. Replies
    5
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    3,701

    locked rotor

    Hello:

    I am an apprentice for residential hvac and was using a cd troubleshooting
    simulation on my computer.

    The symptom was: no cool, fan runs continuously, compressor not running

    you then...
  9. Replies
    27
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    4,203

    I inspect heat exchangers everyday on carrier...

    I inspect heat exchangers everyday on carrier weathermakers
    wav070 etc. and I have found cracks in just about every one.
    up here in Can, there is a law suit on against carrier for using substandard...
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    598

    any good books on flue gas analysis or dvd or...

    any good books on flue gas analysis or dvd or cds?

    don
  11. there are alot of old and new fan motors out...

    there are alot of old and new fan motors out there and i was wondering what is a good range for cfm for:

    cooling speed, low and high fire fan speeds, as well as the continuous low speed fan for...
  12. any schematics out there to show how this is...

    any schematics out there to show how this is done?

    don
  13. Hello: I am looking for a simple wiring...

    Hello:

    I am looking for a simple wiring diagram and explanation for how a lock out relay works pertaining to refrigeration and air conditioning.

    thanks in advance

    don
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    637

    Hello: Is there a good reference out there...

    Hello:

    Is there a good reference out there such as a book or website that outlines simptoms and proceedures to check furnace motors for electrical problems?

    thanks in advance

    don
  15. Thread: cfm

    by theapprentice
    Replies
    11
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    1,042

    Residential A/C units have historically been...

    Residential A/C units have historically been set-up as
    400 CFM per Ton.

    Variable speed Norm for Humid climate is 350 CFM/ ton
    ( a.k.a. LOW Speed)
    ------------------------ Arid -------- is...
  16. Thread: cfm

    by theapprentice
    Replies
    11
    Views
    1,042

    this is very helpful. just to make sure I...

    this is very helpful.

    just to make sure I understand, after calculating the cfm at each tap, I can somewhat safely assume it is a correct setting if the temp rise falls within mid range of the...
  17. Thread: cfm

    by theapprentice
    Replies
    11
    Views
    1,042

    Hello: I was wondering is there a...

    Hello:


    I was wondering is there a guideline for checking for cfm for the various wires representing the various speeds attainable for residential furnaces ( heating and cooling speeds)

    eg:...
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    604

    Hello: I am studying split phase motors and I...

    Hello:

    I am studying split phase motors and I notice that T leads are brought out on some of these motors and some of them the leads are not.

    On these fractional hp motors where the leads are...
  19. I am a student and I was wondering if anyone...

    I am a student and I was wondering if anyone could provide diagrams of how to identify the terminals on the boards of fractional hp split phase, capaciter start, etc motors

    thanks

    don
  20. Replies
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    878

    Hello: I am a residential hvac apprentice...

    Hello:

    I am a residential hvac apprentice currently in school for my first level, and I was just wondering what the effects of leaking suction and or discharge valves have on the low and or high...
  21. Replies
    8
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    1,143

    do flame sensors rust? what gives the difference...

    do flame sensors rust?
    what gives the difference in micro amps other than the fact that it is dirty, the length meby? what kind of reading can
    you expect from a longer one than from shorter ones?
  22. Replies
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    712

    I'm looking for furnace and ac training material...

    I'm looking for furnace and ac training material such as a cd or online training course for resid. furnaces and air cond. Any good ones out there you can recommend?

    thanks in advance
  23. Replies
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    1,143

    What is the best way to test a flame sensor to...

    What is the best way to test a flame sensor to deturmine if it needs replacing? Also the same on the old electronic ignition model of furnaces?
  24. hello: I would like to learn how to accurately...

    hello:

    I would like to learn how to accurately size a home for central air and or furnace.

    Is there an equasion or how is this done? Is it done by sq footage and also can you give other factors...
  25. Replies
    4
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    993

    Hello: I would appreciate it if someone could...

    Hello:

    I would appreciate it if someone could send me a link or news paper article story of a tragic accident that occured as a result of a cracked heat exchanger in a residential furnace.
    ...
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