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  1. Thread: No Superheat

    by rdholder
    Replies
    57
    Views
    3,987

    No superheat for a fixed orifice and subcooling...

    No superheat for a fixed orifice and subcooling for TXV.

    Superheat is set on a TXV from about 14 to 16 degrees, the subcooling will go up and down with the load of a system ( OSA dry bulb and wet...
  2. Thread: No Superheat

    by rdholder
    Replies
    57
    Views
    3,987

    Troubleshooting of an air conditioning system is...

    Troubleshooting of an air conditioning system is a step by step procedure. I have found that a 4 step procedure is the best way to see how well a system is operating.

    The 4 steps are:
    1.Volts and...
  3. Replies
    42
    Views
    8,144

    Mastercool Refrigeration Flaring and Hydra-Swage...

    Mastercool Refrigeration Flaring and Hydra-Swage Tube Expanding tools are NOT knockoffs, in fact other well known manufacturer buy their tools from Mastercool and put their names on the tools

    RD...
  4. Replies
    68
    Views
    6,624

    Because of Dalton's law of gases (the total...

    Because of Dalton's law of gases (the total pressure of a confined mixture of gases is the sum of pressures of each of the gases in the mixture). I have seen systems with non-condensable have 30 to...
  5. Replies
    20
    Views
    7,631

    Look at my profile for my e-mail and I will send...

    Look at my profile for my e-mail and I will send it to you

    Roger
  6. Replies
    20
    Views
    7,631

    All way use manufacturer specs on subcooling or...

    All way use manufacturer specs on subcooling or superheat if you have them but if not.

    for Superheat:

    Always check for proper evaporator air flow when charging a fixed orifices superheat, be...
  7. Replies
    35
    Views
    2,892

    Psychrometrics Psychrometrics is defined as...

    Psychrometrics

    Psychrometrics is defined as the study of air and its properties. The function of an air conditioning system is the transfer of heat out of the conditioned space, and it is the...
  8. Replies
    29
    Views
    1,864

    The short answer is no because of the oils that...

    The short answer is no because of the oils that remain in the tank. Oils do not vaporize till 200 to 250 microns.

    RD Holder
  9. Replies
    29
    Views
    1,864

    Liquid line filter dryer are installed in A/C...

    Liquid line filter dryer are installed in A/C system by manufacture because they know that there is a large number of A/C contractor, do not have or carry a working vacuum pump and less have microns...
  10. Replies
    12
    Views
    892

    A thermocouple should be between 16 to 23 mvdc

    A thermocouple should be between 16 to 23 mvdc
  11. Replies
    14
    Views
    1,049

    In addition to learning/knowing the HVAC trade,...

    In addition to learning/knowing the HVAC trade, take classes in business administration. You can be the best tech in the world but if you do not understand business you will not succeed in business....
  12. Replies
    31
    Views
    2,249

    Condensing Subcooling At saturation...

    Condensing Subcooling

    At saturation pressure-temperature point, the change of state becomes latent heat (invisible or hidden heat). Latent heat is a lack of rise or fall of temperature during a...
  13. Replies
    31
    Views
    2,249

    Evaporator Superheat Evaporator superheat is a...

    Evaporator Superheat
    Evaporator superheat is a calculation of the amount of liquid refrigerant going into the evaporator and the heat load of an air conditioner evaporator. An evaporator coil in an...
  14. Replies
    14
    Views
    812

    Get the HG2 the trade price is 350.00 they can go...

    Get the HG2 the trade price is 350.00 they can go for 279.00 with shipping.

    Roger
  15. Replies
    8
    Views
    1,195

    Force and load set the target superheat. ...

    Force and load set the target superheat.

    Force is the pressure of the high side, forcing the refrigerant into the fix orifice so it can be measured by the outside air temperature at the...
  16. Troubleshooting of an air conditioning system is...

    Troubleshooting of an air conditioning system is a step by step procedure. I have found that a 4 step procedure is the best way to see how well a system is operating.
    The 4 steps are:

    1. Volts...
  17. Replies
    2
    Views
    911

    Call Brenda at Digi-Cool 866-551-2665 RDHolder

    Call Brenda at Digi-Cool 866-551-2665

    RDHolder
  18. Replies
    27
    Views
    5,143

    Send me your E-mail and I will send you a paper...

    Send me your E-mail and I will send you a paper on AC Troubleshooting

    RDHolder
    shop.rdholder.com
  19. Replies
    40
    Views
    5,851

    An R-22 has a critical point temperature of 205.6...

    An R-22 has a critical point temperature of 205.6 degrees F and loses about 6% of capacity for every 10 degrees above 95 degrees OSA.

    An R-410A has a critical point temperature of 162.5 degrees F...
  20. Replies
    15
    Views
    1,732

    An A/C with a Thermostatic Expansion Valve (TXV)...

    An A/C with a Thermostatic Expansion Valve (TXV) is charged to the subcooling of the liquid line leaving the condenser because the superheat is fixed by the TXV. The superheat is specified by...
  21. Replies
    27
    Views
    3,690

    Condensing Subcooling At saturation...

    Condensing Subcooling

    At saturation pressure-temperature point, the change of state becomes latent heat (invisible or hidden heat). Latent heat is a lack of rise or fall of temperature during a...
  22. Thread: Digicool

    by rdholder
    Replies
    6
    Views
    1,531

    Evan, at check out on the shopping cart page, do...

    Evan, at check out on the shopping cart page, do not use the PayPal on that page. rather go to check out and log in or complete billing info then continue to the pay page. On that page you will see...
  23. Thread: Drsa ak900

    by rdholder
    Replies
    2
    Views
    575

    Yes and No they have a AKTRV1140 strap-on Stretch...

    Yes and No they have a AKTRV1140 strap-on Stretch Velcro Sensor that works on a AK900

    Shop.rdholder.com 5% off with hvactalk and free shipping
  24. Calculation of heat

    Calculation of heat

    Calculation of heat movement from the air to the refrigerant is done by the loss of heat in the air. Air that enters the evaporator has heat. This heat is called the enthalpy...
  25. Replies
    2
    Views
    546

    Take a can of R-22 and set in an air conditioned...

    Take a can of R-22 and set in an air conditioned office over night. Take the temperature of the tank, put your gauges on the tank and check the PT. An R-22 at 72 degrees will have a pressure of 125.5...
  26. Thread: ready to pay

    by rdholder
    Replies
    15
    Views
    1,947

    Digi Cool AK900 and the SMAN3 are good digital...

    Digi Cool AK900 and the SMAN3 are good digital manifolds. If you like Digi Cool the Sman2 is about the same price.

    shop.rdholder.com
    5% off with hvactalk code
  27. Replies
    8
    Views
    827

    Fluke and all meters that do temperature will go...

    Fluke and all meters that do temperature will go off with a week battery. if the 9V dc go below 8.5V dc the temperature function go off temperature.

    If the meter use a adapter with the meter to...
  28. Replies
    8
    Views
    1,003

    Have a look at the UEI combustion analyzer they...

    Have a look at the UEI combustion analyzer they have about 22 of them and the Fieldpiece have some too. There is a lot of good one's out there.
  29. Replies
    23
    Views
    2,961

    4 valves is always better than 3 valves, and...

    4 valves is always better than 3 valves, and Fieldpiece and Digi-Cool are coming out with 4 valve manifolds the Mastercool 99961 is a 4 valve digital gauge set.
  30. Replies
    18
    Views
    2,992

    Dad I am not trying to sell here but look for...

    Dad I am not trying to sell here but look for (characteristics of evaporator)

    You can go to my web store, shop.rdholder.com, for FREE articles on Superheat, Subcooling and A/C Troubleshooting. For...
  31. Replies
    18
    Views
    2,992

    The air through a evaporator can be from 26...

    The air through a evaporator can be from 26 degrees to 7 degrees difference depending on the enthalpy (total heat) of the air.

    At an entering air of 80 degrees dry bulb and 55 degrees wet bulb...
  32. Replies
    2
    Views
    795

    The acid and oil tubes will last a year or more...

    The acid and oil tubes will last a year or more in a van. If you keep the RT751 MOISTURE DETECTOR tubes in a refrigerator until you need it, they will also last a year or more. Most suppliers keep...
  33. Replies
    24
    Views
    2,858

    When the 4 valve Manifold come out I will put...

    When the 4 valve Manifold come out I will put them in stock. I will order the 4 valve Manifold for the AK900 as soon as I can.

    RDHolder
  34. Replies
    1
    Views
    466

    You need a Sling Psychrometer or a Digital Sling...

    You need a Sling Psychrometer or a Digital Sling Psychrometer
  35. Replies
    18
    Views
    2,992

    4.5 is the (Air density X 60) if the supply...

    4.5 is the (Air density X 60)

    if the supply air is 62 F degrees and 74% RH the cubic foot per Lb of air is 13.33 cubic Foot. 1Lb of air /13.33 = a air density of 0.075

    0.075 x 60 = 4.5
    ...
  36. Replies
    6
    Views
    838

    5% off with hvactalk code at shop.rdholder.com...

    5% off with hvactalk code at shop.rdholder.com see my profile. rdholder
  37. Replies
    24
    Views
    2,858

    I here that in 8 to 10 weeks that Digi-Cool may...

    I here that in 8 to 10 weeks that Digi-Cool may have a 4 valve Manifold that will fit the AK900
  38. Replies
    15
    Views
    2,063

    The only way that an R-22 evaporator coil can be...

    The only way that an R-22 evaporator coil can be used in an R-410A system is if the coil is UL listed for both R-22 and R410A. An R-22 is pressure tested to 140psig to 150 psig and an R-410A is...
  39. Replies
    8
    Views
    2,392

    Have used the Fieldpiece SRL2K7 on R-410A, R-134a...

    Have used the Fieldpiece SRL2K7 on R-410A, R-134a and R407C it worked every time.

    Owner shop.rdholder.com
    5% with hvactalk code
  40. Thread: sman4 specs

    by rdholder
    Replies
    12
    Views
    2,573

    This summer at shop.rdholder.com ...

    This summer at shop.rdholder.com

    http://www.shop.rdholder.com/Fieldpiece-SMAN4-4-Port-Wireless-Manifold-Vacuum-Gauge-Fieldpiece-SMAN4.htm

    5% off with hvactalk code
  41. I would look at the Fieldpiece SRH2 or the SRH3...

    I would look at the Fieldpiece SRH2 or the SRH3 they do more than DB,WB RH and DP

    http://www.shop.rdholder.com/Digital-Sling-Psychrometer_c25.htm?page=all
  42. Replies
    8
    Views
    2,392

    I use the Fieldpiece SRL2K7 and will Find leaks...

    I use the Fieldpiece SRL2K7 and will Find leaks of 0.1-oz./yr

    http://www.shop.rdholder.com/Fieldpiece-SRL2K7-Infrared-Refrigerant-Leak-Detector-SRL2K7.htm

    Owner shop.rdholder.com
    5% with...
  43. Replies
    319
    Views
    25,357

    http://www.shop.rdholder.com/Digi-Cool-AK900-Digit...

    http://www.shop.rdholder.com/Digi-Cool-AK900-Digital-Refrigerant-Manifold-Digi-Cool-AK900.htm

    RD Holder owner shop.rdholder.com
    5% off with hvactalk code
  44. Replies
    11
    Views
    1,583

    This in duct hot-wire anemometer quickly...

    This in duct hot-wire anemometer quickly calculates CFM from air velocity and free area. And with the intuitive interface, the STA2 makes it easy to capture the correct data.

    •Measures air...
  45. Replies
    10
    Views
    1,260

    I have sold 10 of there 99961 and no one has...

    I have sold 10 of there 99961 and no one has returned it to me. there web is mastercool.com. the only thing is that it comes with one clamp only.

    http://www.mastercool.com/pages/99903.html

    or...
  46. Replies
    5
    Views
    2,032

    The Fieldpiece STA2 in duct hot-wire anemometer...

    The Fieldpiece STA2 in duct hot-wire anemometer quickly calculates CFM from air velocity and free area. And with the intuitive interface, the STA2 makes it easy to capture the correct data.
    ...
  47. The Fieldpiece SC77 or the HS36 is the one to get

    The Fieldpiece SC77 or the HS36 is the one to get
  48. Replies
    1
    Views
    579

    I use the AAT3 and like it

    I use the AAT3 and like it
  49. Thread: Digicool

    by rdholder
    Replies
    6
    Views
    1,531

    shop.rdholder.com 5% off hvactalk ...

    shop.rdholder.com 5% off hvactalk

    http://shop.rdholder.com/Digi-Cool-AK900-Digital-Refrigerant-Manifold-Digi-Cool-AK900.htm
  50. Replies
    11
    Views
    1,583

    I like the Fieldpiece AAT3

    I like the Fieldpiece AAT3
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