An R410a and R22 charging calculator or the "Non TXV Charging Guide" are required to determine the target total superheat. Because these systems do not "control superheat" it is critical that the airflow be as close to possible to correct prior to charging as the system will be charged ...
Isolation valves and charging ports are required. Generally, it is desirable to have isolation valves for servicing the basic system components, such as a condensing unit or condenser. In many cases, manufacturers supply isolating valves with their product, so be sure to check what is included. ...
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