Start-up and Shut-dow n
CVHH-SVX001A-EN
79
Figure 46.
Sequence of operation: ice building: running to ice building
Ice Making Command:
1. Front Panel
2. Tracer
3. External Input
Evap Leaving
Water Temp Rises
Above the Diff To
Stop
Ice Making
Command
Withdrawn
Running
Running
Running
(Ice Building)
Running (Ice to Normal
Transition)
Running
Ice to Normal Transition Timer
(0–10 min)
Head Relief Request Relay
Delay (1–60 min)
Head Relief Request Relay
Delay (1–60 min)
Open IGV at Max Rate/
Max AFD Frequency
Ignore Softloading and
Set CLS=100%
Energize Ice Building
Relay
Close IGV/Min AFD
Frequency
De-Energize Ice Building
Relay
Modulate IGV/AFD
for LWT control
De-Energize Head Relief
Request Relay
Energize Head Relief
Request Relay
Enforce All Limits and Running Mode Diagnostics
Figure 47.
Sequence of operation: ice building: stopped to ice to ice building complete
Ice Making Command:
1. Front Panel
2. Tracer
3. External Input
Evap Entering
Water Temp Falls
Below the Ice
Termination
Setpoint
Auto
Run Inhibit
(Ice Building
Complete)
Starting
Compressor
Running
(Ice Building)
Preparing to
Shut Down
Shutting
Down
Run
Inhibit
Open IGV at Max Rate/
Max AFD Frequency
Close IGV
(0–50 sec)
Postlube
(3 min)
Heat Relief Request Relay
Delay (1–60 min)
Ignore Evap Pump
Off Delay Time
for Ice Building
Close IGV/Min AFD
Frequency
De-Energize Oil Pump
Open Oil Vent Line Valve
Hold position of Oil Vent Line Valve
De-Energize
Condenser
Water Pump Relay
De-Energize Evaporator
Water Pump Relay
De-Energize
Compressor
Confirm No Compressor Currents
Within 8 sec
Ignore Softloading and
Set CLS=100%
Energize Ice Building
Relay
Begin Oil Vent Line
Valve low limit venting
Enforce All Limits and Running Mode Diagnostics
De-Energize Ice
Building Relay
De-Energize Heat
Relief Request Relay
Energize Head Relief
Request Relay
Summary of Contents for CVHH
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