Quote:
Originally Posted by saumil
A method I used for my home a/c is to look at the temperature of the low side hose with a special temp sensor that can wrap around the hose. The refrigerant temp for R134a corresponding to the the low side pressure can be read from the gauge. At maximum fan speed, adjust the pressure of the low side so that the temperature reading of the low side hose (from the temp meter) is about 15 to 20 deg lower than that read from the pressure gauge.
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This is called Superheat for those who want to research further.
Also, you can use one of the infrared thermometers to check the temp of the low side hose. Check it on a metal part of the hose that sweats when the system is running, like near the charging fitting.
BUT, the Superheat charging method does not work on TXV systems, only on systems with a fixed orifice.