Air-Conditioning Equipment:Refrigerant Piping Service and Maintenance

Refrigerant Piping Service and Maintenance

Check the liquid and suction lines to make certain that they do not contact one another. Heat will transfer to the suction line if there is bare contact between the two.

Check refrigerant line connections for proper seat at the evaporator coil. These are nonreusable connecting valves that must be 100 percent seated for effective operation. If these valves have not been 100 percent seated, then the metal diaphragm will obstruct the line and restrict the flow of refrigerant. If this condition is suspected, use a wrench on the stationary fitting of the valve as shown in Figure 9-28 while tightening the nut with another wrench.