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  1. Replies
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    What do your local codes require? Why do you say...

    What do your local codes require? Why do you say old people don't get cold, I service and start up many retirement homes and they are always running at about 78°f. Older folks need it warmer. The...
  2. My heart goes out to you Kefah. We hear about...

    My heart goes out to you Kefah. We hear about these things on the news but you made it very real. Keep in touch and stay safe.
  3. Thread: HVAC apps

    by ckartson
    Replies
    4
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    458

    Thanks, the narrative says good for ITunes and...

    Thanks, the narrative says good for ITunes and Iphone. I have a Samsung galaxyS4 do you think the refrigerant calculator will work with this phone? I am really really new to this or any smart one.
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    1,337

    Accumulated doesn't compensate for charge

    Accumulated doesn't compensate for charge
  5. Replies
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    1,337

    Use a bidirectional receiver

    Use a bidirectional receiver
  6. Thread: HVAC apps

    by ckartson
    Replies
    4
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    458

    HVAC apps

    I am now in the twenty first century with a smart phone provided by the company I work for. I have been learning daily just basic functions. I know many of you use them and refer to apps in your...
  7. Static pressure should be .5"wc range. If you...

    Static pressure should be .5"wc range. If you have no static pressure control as was suggested then you will have no set point adjustment. I am unfamiliar with resi zoning systems but work...
  8. Control voltage that pulls in the contactor comes...

    Control voltage that pulls in the contactor comes from the AHU/Furnace not the condensing unit. Therefore opening the disconnect will not drop out the contactor. Power to the contactor and condensing...
  9. What type of static pressure control do you have?...

    What type of static pressure control do you have? Sounds like possibly to high causing noise through the damper. Try changing static set point (lower) see if that helps.
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    95 psig suction is low for 410a. That's...

    95 psig suction is low for 410a. That's equivalent to a 29° coil Check air flow.
  11. Thread: Freezing Coil

    by ckartson
    Replies
    31
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    2,315

    63°F house is unreasonable based on normal...

    63°F house is unreasonable based on normal design. As far as high side being 500 psig, what is the OAT? What subcooling do you have? During the design phase the Manual J requires indoor condition...
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    Google Tinnerman nuts, they make them also.

    Google Tinnerman nuts, they make them also.
  13. Thread: Freezing Coil

    by ckartson
    Replies
    31
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    2,315

    Why was the 1/4 line left in in the first place,...

    Why was the 1/4 line left in in the first place, pretty small for a three ton system. Any chance of some details besides everything seems fine. Everything isn't fine if you saw the plenum icing. Do...
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    Nine year old system is not old. A system...

    Nine year old system is not old. A system properly maintained should last 20 years. A compressor replacement with all the proper safe guards like a suction filter with a follow up visit for testing...
  15. High sh, the above would give you low sh. Are you...

    High sh, the above would give you low sh. Are you sure the compressor is ok?
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    How many zones are you planning. 5 or less vav's...

    How many zones are you planning. 5 or less vav's is not worth it. VVT may be an option. There are many resi vvt controls systems out there.
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    If the old unit was r22 and new unit is r410a...

    If the old unit was r22 and new unit is r410a then indoor coil should be replaced. That the only reason I would think it's required.
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    No double time on Sunday?

    No double time on Sunday?
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    Yaskawa, they also have some excellent e learning...

    Yaskawa, they also have some excellent e learning modules on their website. Tech support is also very good.
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    493

    Both can be used for modulating application but...

    Both can be used for modulating application but yes they are different piping configurations. I was just answering the OPs question whether they can or cannot, and with a modulating actuator they...
  21. Replies
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    1,587

    If you have CTI's (conventional Termostat...

    If you have CTI's (conventional Termostat Interface) installed in your units then all you need to do to test is jumper the terminals on the CTI to test. The CTI provides contact closure inputs rather...
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    Diverting and mixing can both be used for...

    Diverting and mixing can both be used for modulating. The valve operator installed on it will determine the operation also.
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    4,249

    Double suction risers with single circuit...

    Double suction risers with single circuit compressor unloaders would require inverted trap. Would also require other pipe sizing requirements also.
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    435

    What type of equipment, AHU's and controls do you...

    What type of equipment, AHU's and controls do you have?
  25. Replies
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    No it shouldn't probably the threaded cap needs...

    No it shouldn't probably the threaded cap needs to be tighten or taped
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