Original message
| kritikos
 |  "P\T Chart?"
, posted Mon 30 Jul 01:03  
Hi everyone.This is my post on this site.I am relativey new to refrigeration.Can someone tell me what a pressure\temp cart is for and how to use it?Thanks!!
Learn from your mistakes
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Replies:
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| Zzz
| "Re(1):P\T Chart?" , posted Mon 6 Aug 10:38
The p/t chart is only the beginning, onse you know the pressure at which the refrigerant evaporates or condences then you must find the recomrnded subcool or surereheat that the manufacturer recomends, this can be easily found from the dif between the suction line or liquid line and ambient temps.I highly recomend if y9ou are going further into this trade you buy a thermomiter with a thermocouple for acurate readings.
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| uncle elmo
| "Re(1):P\T Chart?" , posted Tue 31 Jul 20:19
Refrigerants, depending on what kind, will boil or condense at predetermined temperatures (by the manufacture). the refrigerant will evaporate or boil (changing state from a liquid into a vapor) in the evaporator at a given temp. or pressure. you find your suction pressure which is your evaporator pressure (it may vary where you take the reading). after your get the pressure reading for that refrigerant go across to the temp. column and that is the temp. of the refrigerant inside the evaporator. If you now the pressure on the liquid line go across to the temp column and this wiil give you the temp that the refrigerant is condensing (turning back into a liquid).
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| | kritikos
| "Re(2):P\T Chart?" , posted Wed 1 Aug 00:05
Learn from your mistakes
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| | kritikos
| "Re(3):P\T Chart?" , posted Wed 1 Aug 00:11:
Thanks for the reply.so I convert suction and discharge pressure to temp on the gauges?Then use the chart?i am still a little confused.
Learn from your mistakes
[this message was edited by kritikos on Wed 1 Aug 00:12] |
| | fitter597
| "Re(4):P\T Chart?" , posted Fri 3 Aug 22:40
your gauges are a P/T chart depending on what freon is listed on them, mine are old so they have 22 and 12 and i think 502.
The P/T chart is to determin what temp your freon is at what pressures
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| | lynchmob
| "Re(5):P\T Chart?" , posted Mon 14 Apr 09:34
for superheat (temp that should be between 10 and 14 to prevent liquid or lack of for cooling back to the compressor). 1 take suction pressure at evep, the go to the left on your chart and convert. 2, take temp at suction comming out of you evap and minus the 2. Example ( a 55psi suction press, convert. 3, take that 3 and minus the suction and your converted press and that will give you superheat. Below 10 will alow liquid to the compressor which is bad. To high will starv your comp and overheat, as you need refrigant to cool down a comp. Keep between 10 and 14, adjustable by the TXV.
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