Trane RTAF-SVX001K-EN - Ice Making Operation Sequences

Start-Up and Shutdown
70 RTAF-SVX001K-EN
Ice Making (Running to Ice Making to Running)
The figure below shows the transition from normal
cooling to Ice making, back to normal cooling.
Figure 48. Sequence of events: ice making (running to ice making to running)
Running
Ice Making Command:
1. Tracer
2. External
3. Front Panel
Running
(Unitis Building Ice)
Ice Making Command
Withdrawn (prior to
ice complete)
Running
Stage and modulate all
compressors in
sequenceto full load
(if not already)
Start Compressors and
Circuits per Normal
Staging – See other
sequence diagrams
Run Inhibit
(Ice to Normal Transition)
Ice To Normal Transition Timer
(fixed 2 mins)
Run Unload,Close EXVs and
PerformOperationalPumpdown (if
reqd)then Shutoff Compressors,
EnergizeHeaters
Ignore Softloading and
SetCLS =100%
EnergizeIce Building
Relay
Enforce All Limits and
Running Mode Diagnostics
Evap Leaving
Water Temp Rises
Abovethe
DifferentialToStart
Maximum 1:10to fully
loaded
De-energize Heaters,
Control EXVs and Oil
Return Solenoids per
Normal Staging -See other
sequencediagrams
De-energize Heaters,
Control EXVs and Oil
Return Solenoids per
Normal Staging - See other
sequence diagrams
Running
Auto
Enforce All Limits and Running Mode Diagnostics
Control Circuit’s
Condenser Fans forDiff
Pressure
Control Circuit’s
Condenser Fans forDiff
Pressure
Turn off both Circuits’
Condenser Fans
ConfirmNo
CompressorCurrents
CloseEXVs or leave closed
for Circuits’ Off Cycle
De-Energize Oil Return
Drain and Fill Solenoids
Pre-position EXV,Prestart
Condenser Fans and
Energize Fill Solenoid
De-Energize Ice
Building Relay
Continue to Run Evap
Water Pump Throughout