Diagram Measure Sub Cooling

Hvac Subcooling Charging Method Explained Here is how we use the subcooling formula to manually calculate the subcooling in this system: subcooling (r 22) = 89°f – 77°f = 12°f. we see that the calculated subcooling for r 22 refrigerant in this system is 12°f. this is the manual calculation. you can freely use this online subcooling calculator that will determine the subcooling. Here’s the step by step guide: prior to subcooling measurement, the ac unit should be off for at least 30 minutes. this will equalize the refrigerant pressure throughout the unit (lines, coils) since the refrigerant is in a saturated state (mixture of vapor and liquid). let the air out of the hvac gauge. open the vent, listen to that.

Hvac Subcooling Charging Method Explained Subcooling = 100°f – 92°f = 8°f. the calculation itself is the easy part. the harder part is how to measure the needed refrigerant temperatures for superheat and subcooling calculation. we use an hvac manifold gauge and a clamp on thermometer for all superheat and subcooling measurements. Add 5° of sub cooling for every 30 ft of liquid line lift. liquid sub cooling is normally measured at the liquid line service valve. it's usually between 12°f and 15°f. always use manufacturer's recommendations first before using a standard sub cooling chart. 1. on the condenser, take a pressure reading at the liquid line service port. If we measure the temperature on the liquid line exiting the condenser coil then we know the end temperature after the refrigerant has lowered in temperature. subtract the lower temperature measured on the liquid line from the saturated temperature and you have subcooling! 105°f sat temp 93°f actual line temp = 12°f of subcooling. Measure the liquid line temperature where it meets the evaporator, before the metering device. determine the amount of subcooling by subtracting the liquid line temperature from the saturation temperature of the refrigerant. according to industry standards, superheat should be 12 15 degrees in ambient air temperature below 85°f and 8 12.