A cool supply-air reading hides incomplete commissioning
A fictional air-conditioning system has just been installed. The supply air feels cool and the controller shows a satisfied demand, so a contractor proposes signing off the complete installation. The actual building load, airflow, condensate route and refrigerant measurements have not been recorded. One filter is visibly obstructed, and the final protective-control check remains open. A coworker wants to change refrigerant charge based only on the momentary air-temperature difference. This written case operates no equipment or service valve. Identify the distinction between one encouraging observation and a documented commissioned result, and explain why actual conditions, credible measurements and the approved process matter before an inventory or control change.
1. Why is cool air insufficient?
Read the worked answer
It does not establish required load performance, airflow, drainage, protections or every installation criterion under actual conditions.
2. What should precede a charge change?
Read the worked answer
Obtain the actual approved method and credible correlated load, airflow, pressure/temperature and equipment evidence through competent authorized work.