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What Should the High and Low Side Pressures Be for 404a?

FAQs william September 20, 2022

R404a refrigerant pressure chart
Temperature (Fahrenheit) Temperature (Celsius) R404a pressure
– 35°F – 37.2°C 6.8psi
– 30°F – 34.4°C 9.6psi
– 25°F – 31.7°C 12.7psi
– 20°F – 28.9°C 16psi
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What pressure should R404a run at on a chiller? – Techtown
https://www.techtownforum.com › Knowledge Base › what…

How do you charge a 404A freezer?

R-404A and R-507 refrigerant bottles have a dip tube and liquid is poured into the bottle upright. Break the ultimate vacuum by charging liquid refrigerant into the access to the receiver outlet valve or into the liquid line area downstream of the receiver outlet.

What should superheat be for 404A?

A good guide is 4-6 degrees, but your best bet is to contact the device manufacturer for a recommendation.

What pressure should a 404A freezer run at?

If working properly, it should run at 10 to 20 psig. The high side should be around 180.

What is the running pressure of R404A?

This is a table that tells you exactly what the pressure of R404A is at a given temperature. At the low end, the 404A’s pressure is 0.9 psig. At the high end, the pressure of the 404A is 456.8 psig.

How do you read a 404a PT chart?

This is a table that tells you exactly what the pressure of R404A is at a given temperature. At the low end, the 404A’s pressure is 0.9 psig. At the high end, the pressure of the 404A is 456.8 psig.

What is normal subcooling temp?

Subcooling for systems using a thermostatic expansion valve (TXV) should be approximately 10°F to 18°F. Increased subcooling indicates excess refrigerant accumulated in the condenser.

What is the condensing temperature of r404a?

Cooling capacity

Conditions selected are 40°C condensing temperature, 10K superheat, no subcooling, variable evaporating temperature.

What should the high and low side pressures be?

The system should be approximately 25 to 30 psi on the low side and 200 to 250 psi on the high side. If the ambient temperature is higher or lower than normal (70 to 80°F), the pressure will increase or decrease accordingly.

What should refrigerant pressures be?

Most HVAC technicians are familiar with the normal operating range for the low side of an air conditioner. This is typically 60 PSI to 85 PSI for R-22 and 105 PSI to 143 PSI for R-410A and depends on operating conditions.

References:

  1. https://static-htpg.globalimageserver.com/_WP/img/docs/techdata/system_charging_and_setup.pdf
  2. https://hvac-talk.com/vbb/threads/1500431-Proper-404a-super-heat
  3. https://homex.com/ask/what-should-the-suction-pressure-be-on-a-404a-freezer
  4. https://learnmetrics.com/r404a-pt-chart-pressure-temperature-chart/
  5. https://www.youtube.com/watch?v=i29nDp6sRac
  6. https://www.contractingbusiness.com/service/article/20868656/subcooling-and-superheat-superheroes-of-system-charging
  7. https://www.bitzer.de/shared_media/html/a-540/en-GB/187034763187074955.html
  8. https://axleaddict.com/auto-repair/DIY-Auto-Service-AC-System-Diagnosis-by-Symptom
  9. https://www.acservicetech.com/post/why-can-t-you-just-measure-pressures-to-check-a-refrigerant-charge

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