Trane Optimus RTHD - No Load Start Sequence; Operating Limit Conditions

Start-Up and Shutdown
66 RTHD-SVX01K-EN
Ice Building (Auto to Ice Building to Ice Building Complete)
This diagram shows the transition from auto to ice building, to ice building complete
No Load Start
This diagram shows a pre-start sequence with the Start Sequence Type set to 'No Load'.
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 EXV
Open EXV
(0 to 20 Sec)
Shutting
Down
Shutting
Down
Close EXV
(20 Sec)
Figure 38. Sequence of events: no load start
Enforce Restart
Inhibit Timer
(0 to 30 mins)
Confirm Condenser
Water Flow
(6 Second Filter)
S
topped
Or
Run
Inhibit
Removal of all of the following:
Auto
Evap Leaving Water
Temp Above the Diff to
Stop
Waiting
to Start
Starting
Compressor
Energize Evaporator
Water Pump Relay
Energize Condenser
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 minutes
seconds (6 Sec Filter)
Confirm Condenser Water
Flow Within 20 minutes
(6 Sec Filter)
Pre-Position EXV
Waiting
to Start
Oil Heater always energized
when compressor is de-
energized
Confirm Evaporator
Water Flow
(6 Second Filter)
Energize Unload
Solenoid
Confirm Presence of Oil
With Optical Oil Sensor
(0 to 2 mins)
Waiting
to Start
Condenser
Water Pump
Pre-Run
Waiting
to Start
Enforce 'Cond
Pmp Strt Delay'
(0 to 300 Sec)
(0 to 30 mins)
Enforce 'Cprsr
Strt Delay'
(0 to 300 Sec)
Waiting
to Start
External Stop
Local Stop
Tracer/BAS Stop