hvac

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  1. L

    Hello from a HVAC guy .

    Hello to anyone reading this . I am from the HVAC trade been working with 3 phase and controls for the last 20 years . Started my electrical journey studying electronics and did some training on railway electrics and motors. Been putting it off for years but eventually did up to lvl 3 and the...
  2. G

    Crooked Electrical Box

    HVAC company installed new outdoor heat pump and said I also needed new indoor air handler. When attaching the new air handler the old wire was too short. Instead of installing a new wire they took the electrical circuit box and moved it so the wire could reach the new air handler. And now I am...
  3. Bbanks

    Mca and mop for hvac

    Ok, can somebody please explain, with exact code reference and steps/reasons why this works. MCA 37amps. MoP 60 amps. Why can I land #8 on a 60amp breaker? I know theres exceptions in Article 440. Is it in 440.4(b)? I understand why it would make sense. Larger breaker for inrush. The MCA...
  4. G

    If you have a fuse box attached to your HVAC is it necessary to have an off switch -- DIY

    If you have a fuse box attached to your HVAC system is it necessary to have an off switch? Also what does an arc fault circuit interrupter do, and when is it necessary
  5. K

    HVAC, fan not ON working in AUTO mode

    I replaced an old (mercury type) thermostat with a new Honeywell thermostat model RTH2300B. The wiring is quite straight forward based on the manual: red to R, white to W, yellow to Y and green to G. There is no C so the 24VAC common is not connected. I have to install 2 AAA batteries per...
  6. J

    Reading HVAC schematic

    Just want to know what the spikes highlighted in red circles mean on the schematic attached? Help would be much appreciated
  7. T

    Electrician Jobs Master Electrician - Ontario, Canada (Multiple Locations)

    Osborne is currently working with Canada’s leading HVAC provider in hiring talented, skilful Electricians for their first-class service teams. This company prides itself on the strength of its longstanding customer relationships and the quality of its staff members, systems and equipment...
  8. K

    Hvac control panels

    Hi, I am new to this site and was hoping if somebody could point me in the right direction on what qualifications I would need for building control panels? regards keith
    • kneedham
    • Thread
    • control hvac panel panels welcome
    • Replies: 5
    • Forum: The Welcome Forum
  9. Rockingit

    HVAC / MHRC - connection to more than one circuit = RCD problems?

    I've just been told about the intentions for how a mechanical heat recovery unit is wanted to work in a new build house and I can forsee a problem: One unit doing all the various suck and blow things that they do, but with a 'boost' function that is triggered by the lighting switching. I've...
    • Rockingit
    • Thread
    • aus circuit connection electricians' talk hvac problems rcd
    • Replies: 11
    • Forum: Australia
  10. P

    HVAC genius wanted

    anyone got any general info or links on split condensers chiller how they work theory guides etc. dont all rush with miles of info at once now. thank you chaps
    • patricklondon
    • Thread
    • aus electricians' talk engineer forums hvac wanted
    • Replies: 1
    • Forum: Australia
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