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Ice Making (Running to Ice Making to
Running)
The following diagram shows the transition from normal
cooling to ice making, and back to normal cooling.
Figure 37. Sequence of events: ice making (running to ice making to running)
Ice Making Command:
1. Tracer
2. External
3. Front Panel
Running
Running
(Unit is Building Ice)
Maximum 1:10 to fully
loaded
Stage and modulate all
compressors in
sequence to full load
(if not already)
Ignore Softloading and
Set DLS = 200
Energize Ice Building
Relay
De-energize Heaters and
Control EXVs per Normal
Staging - See other
sequence diagrams
Control Circuit's
Condenser Fans for Diff
Pressure
Enforce All Limits and
Running Mode Diagnostics
AC-SVX003A-EN
Ice Making Command
Withdrawn (prior to
ice complete)
Run Inhibit
(Ice to Normal Transition)
Ice To Normal Transition Timer
(fixed 2 mins)
Run Unload, Close EXVs and
Perform Operational Pumpdown (if
reqd) then Shutoff Compressors,
Energize Heaters
Compressor Currents
%*
Close EXVs or leave closed
for Circuits' Off Cycle
Turn off both Circuits'
Condenser Fans
De-Energize Ice
Building Relay
Continue to Run Evap
Water Pump Throughout
Evap Leaving
Water Temp Rises
Above the
Differential To Start
Auto
Confirm No
Control Circuit's
Condenser Fans for Diff
Pressure
Enforce All Limits and Running Mode Diagnostics
Start-up and Shutdown
Running
Pre-position EXV, Prestart
Condenser Fans
Start Compressors and
Circuits per Normal
Staging – See other
sequence diagrams
De-energize Oil Heaters
and Control EXVs per
Normal Staging - See other
sequence diagrams
*
If Ice Building Demand Limit Enable =
Disabled (Default)
Running
91
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