Trane Optimus RTHD - Immediate Shutdown Sequence

Start-Up and Shutdown
62 RTHD-SVX01K-EN
Satisfied Setpoint
The Satisfied Setpoint diagram shows the normal transition from Running to shutting down due to the Evap Leaving water
temp falling below the differential to stop setpoint.
Figure 32. Sequence of events: satisfied setpoint
Running
Auto
Preparing to Shutdown
Energize Unload
Solenoid
Shutting Down
Enforce All Running Mode Diagnostics
De-Energize
Compressor
De-Energize Condenser
Water Pump Relay
Energize Unload Solenoid
(40 Seconds)
Confirm No Compressor Currents
Within 0 - 30 Seconds
Satisfied Setpoint
Open EXV
Open EXV
(0-20 Seconds)
De-Energize Primary Oil
Line Solenoid Valve
Continue to Energize Unload
Solenoid for 60 Mins
Energize Oil Heater
Shutting Down
Close EXV
Close EXV
(20 Seconds)
Pre-Position EXV
to 38% Open for
Next Start