Upon arrival I went to system and pumped down refrigerant into HeatPump. Once refrigerant was removed from lines and AHU I removed old txv and installed new one. Made sure seals were correct and connection was tight. Pressurized System with 400psi of nitrogen and held. No leaks found. Put sensing bulb into place and removed nitrogen. Vacuumed system down to 500micron and held. No leaks found, vacuum held. Opened up valves and let system pressures stabilize. Returned power to unit and ran ac. Superheat 8, Subcool 9, delta t at Evap 23. Let system satisfy thermostat. Unit operating normal. Customer also asked me to take a look at High fan speeds whenever heat is running for first floor system. Found differential settings were not enabled and aux heat lockout was not enabled either, finally system was setup for finish on high stage heat. Enabled aux heat lockout for 40 degrees. Also removed finish on high stage heat so unit will run more efficiently. Both units are operating normal.