Trane Optimus RTHD - Ice Building Sequence (Running to Running)

64
RTHD-SVX01L-EN
Ice Building (Running to Ice Building to
Running)
This diagram show the transition from normal cooling to ice
building, back to normal cooling
Figure 36. Sequence of events: ice building (running to ice building to running)
Runn
ing
Ice Building Command
1. Tracer
2. External
3. Front Panel
Running
(Unit is Building Ice)
Ice Building
Command
Withdrawn
Running
Running
Open Slide Valve at
Maximum Rate
Modulate Slide Valve
for LWT Control
De-Energize Head
Relief Request Relay
Running
(Ice to Normal Transition)
Ice To Normal Transition Timer
( 0 to 10 Mins)
Close Slide Valve
Ignore Softloading and
Set CLS = 100%
Energize Ice Building
Relay
Enforce All Limits and Running Mode Diagnostics
Energize Head Relief
Request Relay
Head Relief Request Relay
Delay ( 1 to 60 Mins)
De-Energize Head
Relief Request Relay
Evap Leaving
Water Temp Rises
Above the
Differential To Stop
Start-Up and Shutdown