Installation and Maintenance Manual

RLC-SVX09H-EN 179
Unit Shutdown
Normal Shutdown to Stopped
The Normal Shutdown diagram shows theTransition from
Running through a Normal (friendly) Shutdown.The
Dashed lines on the top attempt to show the final mode if
you enter the stop via various inputs.
Figure 81. RTWD Normal shutdown
RTWD Sequence of Operation: Normal Shutdown to Stopped or Run Inhibit
Running
Local Stop Chiller Level Diagnostic – Normal Shutdown Latched Chiller Level Diagnostic – Normal Shutdown Nonlatched Tracer 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