Trane Optimus RTHD - Ice Building Sequence (Auto to Complete)

RTHD-SVX01L-EN
65
Ice Building (Auto to Ice Building to Ice
Building Complete)
This diagram shows the transition from auto to ice building,
to ice building complete
Figure 37. Sequence of events: ice building (auto to ice building to ice building complete)
Auto
Evap Entering Water
Temp Falls Below the
Ice Termination Setpoint
Run Inhibit
(Ice
Building
Complete)
Running
(Unit is Building Ice)
Open Slide Valve at
Maximum Rate
Close Slide Valve
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%
De-Energize Ice
Building Relay
De-Energize Head
Relief Request Relay
Close Slide Valve
(40 Seconds)
Starting
Cprsr
Energize Head Relief
Request Relay
Head Relief Request Relay
Delay (1 to 60 Mins)
Shutting Down
De-Energize
Compressor
De-Energize Primary Oil
Line Solenoid Valve
De-Energize Condenser
Water Pump Relay
Confirm No Compressor Currents
Within 8 Seconds
Energize Oil Heater
Open EXV then
Close EX V
Open EXV
(0 to 20 Sec)
Shutting
Down
Shutting
Down
Close EX V
(20 Sec)
Start-Up and Shutdown