Trane R Series Diagnostic Troubleshooting Repair page 60

Module Power and Miscellaneous I/O
Figure 15 SHEI Valve
Electronic Expansion Valve Location
The valve should be installed with the motor in a vertical position, or no
greater than 45° from vertical, as shown in Figure 16. This will prevent oil
logging and the possibility of contamination reaching the motor cavity. The
valve should also be installed as close to the evaporator as possible.
60 RLC-SVD03A-EN