System Pressure R-410A
System Pressure R-410A
(OP)
HI Everyone ,
I have Gree Concealed duct type AC units , runing on R-410a , what are the working pressures for the 410a on the liquid side and on the suction side ( all tech have there own ideas what the pressure should be ) , how we come to a conclusion that the system charge is ok
the problem is that the units are not cooling at all ( thermostat set at 16-18C and room temp stays at 30-31C
the other day i took the following reading on a 4 ton ac unit
high side pressure : 250 psi
high side actual line temp near the indoor unit : 25 C
low side 150 psi
low side actual line temp on suction : 10 C
lets say i have a freshly vacuum unit i need to charge , what parameters should i be looking at inorder to now that chrage is ok ,
the unit have electric expansion valves
plus the outdoor unit have no details for subcooling and the mentioned opr/press id very high , * Attachment *
please advice
I have Gree Concealed duct type AC units , runing on R-410a , what are the working pressures for the 410a on the liquid side and on the suction side ( all tech have there own ideas what the pressure should be ) , how we come to a conclusion that the system charge is ok
the problem is that the units are not cooling at all ( thermostat set at 16-18C and room temp stays at 30-31C
the other day i took the following reading on a 4 ton ac unit
high side pressure : 250 psi
high side actual line temp near the indoor unit : 25 C
low side 150 psi
low side actual line temp on suction : 10 C
lets say i have a freshly vacuum unit i need to charge , what parameters should i be looking at inorder to now that chrage is ok ,
the unit have electric expansion valves
plus the outdoor unit have no details for subcooling and the mentioned opr/press id very high , * Attachment *
please advice





RE: System Pressure R-410A
4.2 MPa is the operating pressure (right on the nameplate). If the pressure you are getting is down 10-15%, you probably need more refrigerant. Consult your user's manual to be sure or call Gree Electric Appliances, Inc. of Zhuhai.
Second, you are looking at a heat pump. Verify the system is in cooling mode.
RE: System Pressure R-410A
Note that your picture of the nameplate also clearly shows an operating pressure (hi/lo) rating = 4.2 MPa/2.5 MPa, which implies the operating pressure is supposed to be between 609 psig and 363 psig, so your measured pressure is well below the manufacturer's nameplate pressure.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: System Pressure R-410A
and the mentioned pressure are way to high , since i already tried to charge on these pressure and it give continuous error for high pressure ,
RE: System Pressure R-410A
PT chart for R-410A. http://www.arkema.com/export/shared/.content/media...
If your low-side readings are accurate it seems your expansion valves are not working correctly. Are their temperature sensors installed correctly?
RE: System Pressure R-410A
Your high side temperature is basically room temp, so you're essentially doing zero compression. Otherwise, the high side would be quite hot, from the work added by the compression process.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: System Pressure R-410A
the out door temp was around 47-48c * very hOt *
@IRstuff
But as high as mentioned in the nameplate i believe its way other the operating pressure for 410
RE: System Pressure R-410A
https://www.rses.org/assets/r410a/R-410A.PDF
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: System Pressure R-410A
First law. No heat is leaving.
Read dbill74,'s post again.
RE: System Pressure R-410A
Hope you are not charging yourself, you need to be EPA certified and need to know what you are doing. Testo and other companies have the tools.