Step$-1$: At time zero, only blower is turned on$.$ There is no cooling in this stage. Measure the

temperature and air flow rate at various points as shown in Figure$-1.$

Step$-2$: Put the system in $$cooling$$ mode to turn on the compressor. Run the system for several

minutes. Measure the temperature and air flow rate at various points as shown in Figure$-1.$

Step$-3$: Measure the amount of air passing across the evaporator coil. The airflow is measured in

cubic feet per minute $($CFM$).350$ to $400$ CFM per ton of cooling is required for proper air

conditioning system operation. For example, if you are checking a $3-$ton system, the airflow

required is between $1050$ and $1200$ CFM$.$

Examine, in detail, the various components and operation of an HVAC system.

$$ Identify the components and their function.

$$ Trace flow paths through the various parts of the system.

$$ Discuss the temperature measurements of the refrigerant at several locations within the

refrigeration system, and the temperature and humidity of the air stream.