Complete); No Load Start - Trane Optimus RTHD Installation, Operation And Maintenance Manual

Start-Up and Shutdown
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)
Ice Building Command
1. Front Panel
2. Tracer
3. External Input
Starting
Auto

No Load Start

This diagram shows a pre-start sequence with the Start Sequence Type set to 'No Load'.
Figure 38. Sequence of events: no load start
Removal of all of the following:
External Stop
Local Stop
Tracer/BAS Stop
Stopped
Or
Auto
Run
Inhibit
Confirm Evaporator
Water Flow
(6 Second Filter)
Energize Evaporator
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 minutes
seconds (6 Sec Filter)
Oil Heater always energized
when compressor is de-
energized
66
Running
Cprsr
(Unit is Building Ice)
Open Slide Valve at
Maximum Rate
Ignore Softloading and
Set CLS = 100%
Energize Ice Building
Relay
Head Relief Request Relay
Delay (1 to 60 Mins)
Enforce All Limits and Running Mode Diagnostics
Evap Leaving Water
Temp Above the Diff to
Stop
Waiting Waiting
to Start to Start
Enforce Restart
Confirm Condenser
Inhibit Timer
Water Flow
(0 to 30 mins)
(6 Second Filter)
Enforce 'Cond
Pmp Strt Delay'
(0 to 300 Sec)
Energize Condenser
Water Pump Relay
Confirm Condenser Water
Flow Within 20 minutes
(6 Sec Filter)
Evap Entering Water
Temp Falls Below the
Ice Termination Setpoint
Shutting
Shutting Down
Down
Close Slide Valve Open EXV
(40 Seconds) (0 to 20 Sec)
De-Energize Condenser
Close Slide Valve
Water Pump Relay
De-Energize Primary Oil
De-Energize Ice
Line Solenoid Valve
Building Relay
De-Energize Head
Energize Oil Heater
Relief Request Relay
Energize Head Relief Open EXV then
Request Relay Close EX V
De-Energize
Compressor
Waiting Waiting
to Start to Start
Condenser Enforce 'Cprsr
Water Pump Strt Delay'
Pre-Run (0 to 300 Sec)
(0 to 30 mins)
Run Inhibit
Shutting
(Ice
Down Building

Complete)

Close EX V
(20 Sec)
Confirm No Compressor Currents
Within 8 Seconds
Starting
Waiting
Compressor
to Start
Confirm Presence of Oil
With Optical Oil Sensor
(0 to 2 mins)
Energize Unload
Solenoid
Pre-Position EXV
RTHD-SVX01K-EN