Trane S Series - Normal Shutdown to Stopped

RLC-SVX09Q-EN
63
Normal Shutdown to Stopped
The following diagram shows the Transition from Running
through a Normal (friendly) Shutdown. The dashed lines on
the top attempt to show the final mode if stop is selected
via various inputs.
Running
Local Stop
Chiller Level Diagnostic – Normal Shutdown Latched
Chiller Level Diagnostic – Normal Shutdown Nonlatched
BAS Stop
External Auto-Stop
Stopped
or
Run Inhibit
Shutting Down
Energize Unload
Solenoid Both
Compressors
Shutting Down
De-Energize both
Compressors
Brief Run-Unload, both Compressors
(5 Seconds)
De-Energize Condenser
Water Pump Relay
Both Circuit’s EXVs to
50% for off cycle
Leave Both Cprsr’s
Unload Solenoids
Energized for 60 mins
Energize all Oil Heaters
Time out Evap Pump Off Delay
(adj 0-30 minutes)
De-Energize Evaporator
Water Pump Relay
DeEnergize Step
Load Solenoid
Both Compressors
1 sec
Recalibrate EXV if 24 hrs
since last recalibration
De-Energize Oil Return
Fill and Draing Solenoids
of Both Circuits*
Confirm No Compressor Currents
8 Seconds after compressor is de-energized
*
Oil Return Fill Solenoid Valve is
installed only for gas pump oil
return system.
Start-Up and Shutdown