System Readings (refrigeration)

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Author:
salvatorefricano
ID:
295890
Filename:
System Readings (refrigeration)
Updated:
2015-02-24 18:53:24
Tags:
superheat subcooling suction line temp
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Description:
how to read gauges and convert to temperatures, subcooling, superheat, txvs,low pressure switch settings, fan cycling switch settings
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  1. Where do you get Ambient Air readings from.


                                 High Side
                            
    2" from the condenser coil
  2. How can you get Liquid Line Temp.

                                 High side
    Condensing Temp - Subcooling
  3. How can you get High Side pressure.

                                 High Side
    Condensing temp converted.
  4. How do you get Condensing Temperature.( Design)

                                 High Side
    Ambient air + Condenser TD(Design)
  5. How Do you get Condensing Temperature(Actual)

                                High Side

    High side pressure, converted (Actual)
  6. How can you get Condenser TD ( Temperature Difference).
    • Condensing Temperature - Ambient
    • (Condenser Temperatures are):
    • Medium temp 30*
    • Mid Efficiency 25*
    • High Efficiency 20*
    • Remote 10*
  7. How can you get Subcooling.

                                 High Side
    Liquid Line Temp - Condensing temp
  8. How can you get Suction Line Temp.

                                  Low Side
    Superheat - Boiling Temp
  9. How can you get Low Side Pressure.

                                 Low Side
    Boiling Temp converted to a pressure.
  10. How can you get Superheat.

                                 Low Side
    Boiling Temp - Suction line Temp
  11. where is supply air
    back of evaporator coil = boiling temp. (coil temp)
  12. where do we get Return Air
    Temp in front of the fan = box temp
  13. How do we get Delta T
    Supply air - Return Air.
  14. What would happen to the
    subcooling/superheat if you open or
    turn the txv clockwise.
    your Superheat/subcooling would go up.⇧
  15. What would happen to your subcooling/superheat if you close or turn the txv counterclockwise.
    Your Superheat/Subcooling wil go down⇩
  16. What is considered to be low ambient temperature.
    60*F and below.
  17. How would you get the C/O Setting for a Low Pressure Switch
    • 5# for Low pressure refrigerant
    • 10# for high pressure refrigerant
  18. How would you get a C/I setting for a Low Pressure Switch
    Low side PSIG plus 10# (buffer)
  19. What is the formula to getting a fan cycling switch setting
    Low Ambient(60)+ condensing TD= X *F convert to pressure= X #PSIG= C/O + 40#= X = C/I
  20. Definition: Delta-T
    • Difference in temperature across a divider; 
    • often used to refer to the difference between 
    • indoor and outdoor temperatures.
  21. Definition:  superheat
    Sensible heat in a gas above the amount needed to maintain the gas phase.
  22. When fan is off in a from a fan cycling switch you can only measure what
    Superheat
  23. Evaporator temp is the same as  what
    Boiling temperature
  24. how do you get evaporator temp
    convert low side pressure to a temperature
  25. How do you get boiling temp(Design)
    Return air - evap TD(Design)
  26. how do you get boiling temp (Actual)
    convert low side pressure to a temp(Actual)
  27. How do you get Design evaporator TD
    Box temp - Evaporator TD
  28. Inside box temperature is the same as what
    Supply air temperature

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