The liquid pressure should be 385-395 and the suction pressure should be about 138 but will probably be a few psi lower since it's so cool in the space. Very little residential experience. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. F +/- 1.5 deg. Pressure that is too much lower or higher shows there is a problem. We use cookies to give you the best possible experience on our website. Your inability to operate the equipment at 40° screwed your client over. Using a PT chart or pressure temperature chart one can determine the pressure or the temperature of the refrigerant. I added a little freon and the high side shot up to 425. The sub-cool should be 11 deg. F. If your unit doesn't have the charging chart on the inside data sticker let me know and I'll provide one for you. It ran for about 15 minutes. However, this rule of thumb (obviously) does not work on an R-410A system. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI. The pressure of the refrigerant corresponds with the temperature. #1 how you know it had “Freon” refrigerant? A normally operating R-410A system with the same condensing temperature of 120 degrees and a 45 degree evaporator saturation temperature will have a high side pressure … R410A is an HFC refrigerant, invented by Honeywell, that has been developed to replace the HCFC refrigerant R22. I installed a new 410a complete system with new Orfice coil and new lineset. R-134A replaced R-12 for automobile air conditioning systems. This script determines the gas pressure based on temperature of R410a refrigerant. #3 the reason you can’t find anything on operating R-410A below 65° is there is no such rule.. Discussion Starter • #1 • Sep 17, 2017. Suction pressure was 110 and high side of 280. A more applicable guideline is 20˚-25˚ suction saturation below outdoor ambient. Suction Pressure / EVAP DTD Rule of Thumb Another common old school rule of thumb is suction pressure should be close to the outdoor temperature in a R22 system. #2 insurance company is not responsible for pre-existing conditions.. - Answered by a verified HVAC Technician. One may also ask, what is the pressure of r410a at 72 degrees Fahrenheit? It makes no difference what type of refrigerant you have. I have been a commercial DDC controls installer/programmer past few years. I am still involved, a few times a year, on some of the r-22 chillers we have under account. I tried to research this but my researching mojo must be off, I … Systems operating on R410A run at a pressure of about 1.6 times that of similar systems operating on R22. 70 degrees on install date and initial start up. What should the low and high pressure be of a 410a spilt a/c system with a outside air temp of 75 to 80 degrees? R-410A is currently being phased in for residential use as the phase period for R-22 draws nearer. It’s all about the … R410A Pressure Temperature Chart 14 12.23 11.22 162.63 12.19 11.18 162.05 16 12.95 11.93 173.03 12.91 11.89 172.43 18 13.70 12.68 183.89 13.65 12.64 183.25 56 Posts . Genetron 407C 407C Blend HFC POE 81.0 70.6 -46.5 Genetron 408A 408A Blend HCFC AB 75.6 65.7 -48.2 Genetron 409A 409A Blend HCFC AB 84.3 75.4 -30.0 Genetron AZ-20 410A Azeotropic Mixture HFC POE 77.2 65.6 -60.6 Genetron 502† 502 Azeotrope CFC MO 86.9 75.4 -49.3 Genetron 503† 503 Azeotrope CFC MO 73.6 – -126.0 to produce an evaporating temperature of 40 degrees F and a condensing temperature of 115 degrees, the suction and head pressures would be 83 psia and 257 psia in an R-22 system, while they would be 133 and 406 psia, respectively, in an R-410A system. 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