I'm working on a transport a/c system using R22 and a Carlyle 06D compressor.
To measure the superheat, the maintenance manual tells us to place the temp probe next to the TXV's temp bulb.
That's easier said than done, because that area is very hard to get to (only one hand can fit in there). In addition, the TXV's temp bulb is covered with several layers of insulating tape, which can't be removed without destroying it, due to the strong glue.
So I need another place to position the temp probe. Some textbooks say on the suction line, 6 inches from the compressor. This would work, but its about 6 to 7 feet away from where the manufacture says to place the probe. I don't know how this would affect the superheat reading (the manual's superheat range is 12 - 18 degrees, with 15 being ideal). Is there a conversion factor I need to use, to compensate for the excess length?