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  1. Thread: Coolsavers

    by Texasgrand
    Replies
    5
    Views
    871

    I understand these tools tested most accurate. I...

    I understand these tools tested most accurate. I would also be interested if there are equivalent or better tools out there. New tools come out every day.
  2. Replies
    20
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    18,998

    Everyone must have the EPA 608 Certification....

    Everyone must have the EPA 608 Certification.
    Some companies want ICE Certification for 1 year entry level techs.
    Many want NATE for 2 year+ techs.
    RSES also has a certification.

    Certification...
  3. Replies
    8
    Views
    3,660

    I've been involved in buying and selling a few...

    I've been involved in buying and selling a few businesses. If the company has sales under about 1 mil, the owner is basically the company and could go after the customers after the buy sell...
  4. Replies
    11
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    1,090

    Testo 556 vs 550

    If I were going to buy digital refrigerant analyzers for all the techs, what would I buy. Example the Testo 556 is well over $1000, more than the Testo 550. Both provide simutaneous pressures,...
  5. Replies
    11
    Views
    1,090

    Which Gauge set and why?

    Which Refrigerant analyzer / gauge manifold, and why.
    What tools and features are essential in a gauge/manifold for efficient and accurate charging and diagnosis of residential or small commercial...
  6. Replies
    14
    Views
    6,088

    We used a trash pump mounted on a two wheeler...

    We used a trash pump mounted on a two wheeler with appropiate fittings, valves and quick connects. Add a plastic barrell.
  7. Replies
    17
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    2,078

    I'll take a look, thanks

    I'll take a look, thanks
  8. Replies
    17
    Views
    2,078

    Dallas vendor?

    I give up. Can anyone suggest a Dallas Tx vendor that can fix me up with a working solution?

    USB to RS485
    Ethernet to RS485
    PCMCIA to Rs485
  9. Replies
    17
    Views
    2,078

    Thanks for all the help. I'm still...

    Thanks for all the help.

    I'm still investigating all of these.

    I did get the Vista drivers for the Keyspan USB x 232 from Tripplite.com I connected a 232 x 485 converter made by 3One Data...
  10. Replies
    17
    Views
    2,078

    Thanks for the help. Looks like I have several...

    Thanks for the help. Looks like I have several options. I will post my progress.
    Thanks again
  11. Replies
    17
    Views
    2,078

    None of our laptops have serial ports.

    None of our laptops have serial ports.
  12. Replies
    17
    Views
    2,078

    Vista Laptop USB RS 485 Converter

    I can't get a USB x RS485 converter to work on a Vista laptop. I've tried Belkin and another brand. Anyone have any suggestions?

    I've also tried a TCP IP x RS485 converter (BF-430) without...
  13. I saw a new system this week that attaches to a...

    I saw a new system this week that attaches to a rooftop unit with magnets, covering the condenser coil. It has a wet pad with spray heads and a dry prefilter. The theory is the water evaporates...
  14. Replies
    10
    Views
    3,973

    Drill test well? If this is a commercial...

    Drill test well?
    If this is a commercial development the civil engineer has probably already drilled geo test holes to determine subsurface soil types for structural design. You are looking for...
  15. Replies
    23
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    1,900

    My opinion, most of the industrial and large...

    My opinion, most of the industrial and large commercial users already have meters that will record time of use.

    The real reason for deploying smart meters on small commercial and residential...
  16. Replies
    38
    Views
    2,625

    Be happy to share when my deal is locked down. ...

    Be happy to share when my deal is locked down. Send me an e-mail, it will be a few weeks.
  17. Replies
    38
    Views
    2,625

    Ok I ordered an industrial PLC front end with a...

    Ok I ordered an industrial PLC front end with a graphical display, software, built in Ethernet, BacNet and Modbus. Controllers are BacNet or Modbus. Modbus controllers have a drag and drop...
  18. Replies
    23
    Views
    1,900

    Food for thought..... The power companies are...

    Food for thought..... The power companies are spending billions to deploy smart meters. Why? Open market, on peak power, mid day summer, can go for $100. KWH Off peak nights in west Texas with...
  19. Replies
    7
    Views
    1,334

    It's definatly a result of overheating and the...

    It's definatly a result of overheating and the refrigerant oil. We've flushed at least 40 units over 2 years from one manufacturer.
  20. Replies
    22
    Views
    3,613

    We like full maintenance because we can do most...

    We like full maintenance because we can do most of our work in the off-season. We treat the equipment like we own it and after several years have few unexpected breakdowns. The margins are and...
  21. Replies
    23
    Views
    1,900

    I saw this a few weeks ago and signed up for...

    I saw this a few weeks ago and signed up for e-mail updates but I have not received any.

    It looks like they plan to tie this in with smart meters when they are deployed and you will have a real...
  22. Thread: CO2

    by Texasgrand
    Replies
    34
    Views
    1,783

    This is essentially what engineers are doing with...

    This is essentially what engineers are doing with the chiller beam systems we're starting to see.
  23. You can probably drop the temp to about 5 degrees...

    You can probably drop the temp to about 5 degrees above the dewpoint. One concern would be reducing the airflow significantly. The fan is designed for open air, no restriction or friction loss. I...
  24. Thread: CO2

    by Texasgrand
    Replies
    34
    Views
    1,783

    Cutting edge schools are using 100% outside air...

    Cutting edge schools are using 100% outside air energy recover ventilators with displacement air distribution. Exceeding ASHRAE 62 for fresh air by 30%
  25. Replies
    38
    Views
    2,625

    1: New Construction? Existing? Existing for now....

    1: New Construction? Existing?
    Existing for now. New construction soon,

    2: If existing..does it have any DDC equipment?If so... Is it Staying? Going? Dont know the options yet?
    No existing...
  26. Replies
    38
    Views
    2,625

    What's open protocol to you? modbus ... bacnet?...

    What's open protocol to you?
    modbus ... bacnet?

    What energy management techniques are you interested in doing?
    Would like an easy drag and drop block programming with the ability to write our...
  27. Replies
    8
    Views
    822

    We have used pace scientific and the Onset Hobo. ...

    We have used pace scientific and the Onset Hobo. Pace is a 4 channel with great software , shirt pocket size but cost 10 times the price of a Hobo. Really good if you need all 3 legs on 3 phase....
  28. Replies
    7
    Views
    5,139

    If you can get a curve for that coil from the...

    If you can get a curve for that coil from the manufacturer you can use the water pressure drop across the coil to determine GPM flow and read capacity.

    When you have that, calculate 1 btu to lower...
  29. Replies
    4
    Views
    883

    1 BTU to raise the temp of 1 pound of water 1...

    1 BTU to raise the temp of 1 pound of water 1 degree.
    Convert pounds of water to gallons.
    BTU per gallon x temperature difference
  30. Replies
    2
    Views
    515

    Are you looking for capacity? You can do the...

    Are you looking for capacity? You can do the calculation on the indoor unit with delta for temp and grains of water or you can use the delta on the outdoor unit with just sensible if you know the...
  31. Replies
    9
    Views
    1,515

    We work on a brand of frozen frapachino machines...

    We work on a brand of frozen frapachino machines and would be interested if the offer is still open.
  32. Replies
    7
    Views
    1,334

    Flush, overheated pastry case

    We have a customer with stand alone pastry cases. The condenser is below the case and gets dirty really fast. The unit overheats, oil turns to paraffin and stops up the TXV and gets distributed...
  33. Thread: CO2

    by Texasgrand
    Replies
    34
    Views
    1,783

    I think the current LEED standard and ASHRAE 62.1...

    I think the current LEED standard and ASHRAE 62.1 2007 for demand ventilation is 600 PPM CO2 plus the measured exterior CO2 PPM. If you donít have demand ventilation then you must have constant...
  34. Replies
    23
    Views
    1,900

    For measurement and verification of energy...

    For measurement and verification of energy savings the IPMVP international performance measurement and verification protocol. They have a website and the standards can be downloaded for free. Make...
  35. Replies
    38
    Views
    2,625

    Please recommend DDC hardware

    What manufacturer would you recommend for DDC or PLC. Low up fron cost. Buildings under 100,000 sf. Building automation and energy management, open system protocol. Easy to design algorithm's,...
  36. Replies
    14
    Views
    6,088

    I've put in verticle wells, lake loops (slinkies)...

    I've put in verticle wells, lake loops (slinkies) verticle runs and have an open system on my farm for the last 15 years. I use the waste water on my farm for irrigation.

    Most of the commercial...
  37. Replies
    10
    Views
    3,973

    There are significant differences in the heat...

    There are significant differences in the heat exchange rate for earth coupled condensers. This size project you should drill a test well and measure the rate of heat exchange.
  38. Replies
    25
    Views
    6,755

    I have been using an open loop geo in Texas for...

    I have been using an open loop geo in Texas for about 15 years and have put in several closed loop and lake loop systems. My groundwater temp is 59F. Rule of thumb is 3 gpm of condenser water per...
  39. I've seen evaporative spray systems for condenser...

    I've seen evaporative spray systems for condenser coils. Fouling or erosion of the coil or fins can be a problem. Why not put in an evaporative condenser?
  40. Replies
    0
    Views
    393

    Algorithm, logic block reference book

    Are there any good basic reference materials out there that explain the logic and show examples for common logic blocks for controling HVAC and energy management?
  41. Replies
    1
    Views
    520

    Software for modbus

    I have a thermostat that communicates in modbus. I want to set up a pilot project to communicate and control from a PC. Any recomendations for software that contains HVAC logic for modbus?
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