@John C.
just for clarity, I wanted to point out that the book page 70-10-2 diagram provided by Doug is wrong! As is common in books that misprints happen, the diagram seems to show a separate TXV bulb connecting to the vapor line. that setup would be common in a stationary system, but is in fact wrong here, and even the plumbing is wrong. Figure 70-10-5 shows the correct TXV for this application.
It can get really confusing when in the learning stage and get inaccurate material! The "thermostat" they show in that diagram is the temp switch, and they commonly stab them right into the evaporator fins to get the most accurate reading possible.
just for clarity, I wanted to point out that the book page 70-10-2 diagram provided by Doug is wrong! As is common in books that misprints happen, the diagram seems to show a separate TXV bulb connecting to the vapor line. that setup would be common in a stationary system, but is in fact wrong here, and even the plumbing is wrong. Figure 70-10-5 shows the correct TXV for this application.
It can get really confusing when in the learning stage and get inaccurate material! The "thermostat" they show in that diagram is the temp switch, and they commonly stab them right into the evaporator fins to get the most accurate reading possible.