Why Ac compressor noisy at start up compressor sweating sub cooling ten return air seventy six register air fifty seven outside air eighty eight pressures sixty and two hundred?

Answer 1

Assuming the refrigerant is R-22 and that the metering device is not a TX valve:

1. Determine air delivery system is operating properly by removing air filter(s), cleaning blower fan wheel, and (where applicable) replacing the fan belt.
2. Determine the size of the condensing unit in tons (1 ton = 12,000 BTUs). For every ton of cooling, you need a minimum of 350-400 CFM of airflow.
3. Measure the airflow. You can use the temperature rise method (measuring return and supply temperatures after 10 minutes of heating, and clocking the meter for natural gas), a hotwire anenometer, or a rotating-vane anenometer. Ensure that it matches or exceeds the requirements of 350-400 CFM/ton. Rectify if the airflow is too low.
4. Measure the return air Wet Bulb (not Dry Bulb) temperature.
5. Measure the outdoor air Dry Bulb temperature.
6. Most equipment will give charging charts indicating the proper superheat or subcooling readings for the R.A. Wet Bulb and outdoor Dry Bulb. If you can find nothing, you do not want to exceed 10 F degrees superheat (measured at the outlet of the evaporator coil) or go below 15 F degrees subcooling (measured at the liquid line leaving the condensing unit).