Table of Contents
Advertisement
Start-Up and Shutdown
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 12. 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 CLS =100%
Energize Ice Building
Relay
De-energize Heaters,
Control EXVs and Oil
Return Solenoids per
Normal Staging - See other
sequence diagrams
Control Circuit's
Condenser Fans for Diff
Pressure
Enforce All Limits and
Running Mode Diagnostics
22
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Withdrawn (prior to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
Confirm No
Compressor Currents
Close EXVs or leave closed
for Circuits' Off Cycle
De-Energize Oil Return
Drain and Fill Solenoids
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
Running
Pre-position EXV, Prestart
Condenser Fans and
Energize Fill Solenoid
Start Compressors and
Circuits per Normal
Staging – See other
sequence diagrams
Control Circuit's
Condenser Fans for Diff
Pressure
De-energize Heaters,
Control EXVs and Oil
Return Solenoids per
Normal Staging - See other
sequence diagrams
Enforce All Limits and Running Mode Diagnostics
Running
RTAF-SVX002D-EN
Advertisement
Table of Contents
