These three UPDATED HVAC quick reference polystyrene cards are double sided and designed to be used with Air Conditioners and Heat Pumps to measure the refrigerant charge level in a unit, charge refrigerant, troubleshoot refrigerant based problems, and measure heat transfer to determine if there is a problem.
 

• Use the P/T Chart to find the Saturated Temperature of the common refrigerants R-32, R454B, R-410A, R-22, R-407C, R-422B, and R-438A.
• Use the Guide to determine how to find the Bubble and Dew Saturated Temps of Blend Refrigerants.
• Use the Refrigerant Weight Chart to calculate the amount of refrigerant needed per foot of tubing R-32, R454B, R-410A, R-22, R-407C, R-422B, and R-438A.
• Use the Guide to weigh in the full or partial refrigerant charge into an empty vacuumed unit.
• Find the Target Subcooling to measure the refrigerant level of systems with a TXV metering device.​
• Use Subcooling to determine if a system is undercharged, correctly charged, or overcharged.
• Use Delta T to determine if the system is exchanging heat properly.
• Find the Target Superheat to measure the refrigerant level of systems with a fixed orifice metering device.
• Use Total Superheat to determine if a system is undercharged, correctly charged, or overcharged.