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  1. Thread: No Superheat

    by rdholder
    Replies
    57
    Views
    3,706

    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
    3,706

    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
    7,662

    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
    6,248

    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
    7,340

    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
    7,340

    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
    2,675

    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
    1,687

    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
    1,687

    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
    822

    A thermocouple should be between 16 to 23 mvdc

    A thermocouple should be between 16 to 23 mvdc
  11. Replies
    14
    Views
    958

    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
    2,187

    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
    2,187

    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
    766

    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
    1,164

    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
    883

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

    Call Brenda at Digi-Cool 866-551-2665

    RDHolder
  18. Replies
    27
    Views
    5,031

    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
    5,619

    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
    1,674

    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
    3,537

    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
    1,481

    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
    551

    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
    524

    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...
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