Trane CenTraVac CVHE - Page 81

CVHE-SVX005C-EN
81
Figure 58. Sequence of operation: ice building: running to ice making
Running
Ice Building
Command
Withdrawn
Running
Run
n
ing
(Ice Building)
Open IGV at Max Rate /
Max AFD Frequency
Running
Modulate IGV/AFD
for LWT control
Close IGV /Min AFD
Frequency
Enforce All Limits and Running Mode Diagnostics
Ice Building Command:
1. Front Panel
2. Tracer
3. External Input
Energize Ice Building
Relay
Ignore Softloading and
Set CLS = 100%
Energize Head Relief
Request Relay
Running (Ice to Normal
Transition)
Evap Leaving
Water Temp Rises
Above the Diff To
Stop
De-Energize Ice Building
Relay
De-Energize Head Relief
Request Relay
Ice to Normal Transition Timer
(0-10 Minutes)
Head Relief Request Relay
Delay (1 to 60 Mins)
Head Relief Request Relay
Delay (1 to 60 Mins)
Start-Up and Shutdown