When you are gauged up on the unit, as close to where your temperature reading will be taken as possible, (note: ofter times the there will be access specifically for this purpose very near the txv) use a good thermometer and obtain the temperature of the suction line 6 inches out from the evaporator coil. (right where the sensing bulb is in refrigeration or the equalizer tube for the txv in A/C is best.) Then, convert the pressure reading on your suction gauge to degrees for the type of refrigerant in the system and subtract it from the reading on your thermometer.
This is the amount of heat that is being added to the refigerant AFTER it has changed state from a liquid to vapor. Remember to use a temperature pressure chart to get your temps for what kind of refigerant that's in the system. A/C systems should be between 15 and 20 degrees F Refrigeration is more like 6 - 12 degrees .
No.
The evaporator superheat for this system would be 18°F. This is calculated by subtracting the evaporator outlet temperature of 58°F from the saturation temperature of the refrigerant at 76 psig, which is 76°F. The difference between the two temperatures gives the evaporator superheat.
18°C is equal to 64°F
your ac motor has gone out. I f no air is coming out at all. If you have warm system needs to be recharged
To find the evaporator superheat, you need the saturation temperature of R22 at the evaporator pressure of 76 psi (which corresponds to roughly 40°F), and then subtract this from the measured outlet temperature of 58°F. Therefore, the evaporator superheat in this scenario would be approximately 18°F.
Junkyard or dealer, they shouldn't be much either place.
standing in front of truck, on left by blower housing
You probably have a jammed or otherwise defective vent door.
Yes, as the ice is blocking the air flow and reducing the unit's efficiency, or completely clogging the air path. If you are experiencing high humidity conditions that are causing ice build-up on the coils, you should raise the air conditioner's temperature setpoint to a slightly higher temperature so that ice does not form. Normally, the output of an air conditioner should be at least two or three degrees above the freezing point, i.e., 34°F to 35°F to prevent ice formation on the coils.
Vaccum Leak
There are two measures used to describe the cooling capacity of an air conditioner. One is BTU or 'British Thermal Unit' but that is the old way of doing it. The modern way is the Kw or Kilowatt of cooling. to get BTU you have to multiply Kw by 3412. A small air conditioner for maybe one person in a little office might be 9000 BTU or 2.6 kW, a large industrial air conditioner for a bigger area might be 35,000 BTU or 10.26 kW.
To determine the total superheat entering the compressor, you would need to know the saturation temperature corresponding to the evaporating pressure of 76 psig for R-22. Once you have that saturation temperature, you would subtract the compressor inlet temperature of 65 F from the saturation temperature to find the total superheat.