Trane Optimus RTHD - Starting Sequence: AFD; Typical Running Sequence

Start-Up and Shutdown
RTHD-SVX01K-EN 59
Power Up to Starting
The Power up to starting diagram shows the timing from
a power up event to energizing the compressor. The
shortest allowable time would be under the following
conditions:
• No motor restart inhibit
• Evaporator and Condenser Water flowing
• Power up Start Delay setpoint set to 0 minutes
• Adjustable Stop to Start Timer set to 5 seconds
• Need to cool
The above conditions would allow for a minimum power
up to starting compressor time of 95 seconds.
Figure 27. Sequence of events: power up to starting
Enforce Restart
Inhibit Timer
(0 to 30 mins)
Confirm Condenser
Water Flow
Starting
Compressor
Energize Evaporator
Water Pump Relay
Energize Condenser
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 minutes
(6 Sec Filter)
Confirm Condenser Water
Flow Within 20 minutes
(6 Sec Filter)
Pre-Position EXV
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
Condenser
Water Pump
Pre-Run
Enforce 'Cond Pmp
Strt Delay'
(0 to 300 Sec)
(0 to 30 mins)
Enforce 'Cprsr
Strt Delay'
(0 to 300 Sec) (0 to 2 mins)(6 Second Filter)
Symbio™ 800
Boot Time
(15 Sec)
Enforce Power Up
Start Delay Timer
(0 to 30 mins)
Overdrive EXV Open
Call for
Cooling
Last Mode
was Auto
Power
Applied
Power
Up
Auto
Waiting to
Start
Waiting to
Start
Waiting to
Start
Waiting to
Start
Waiting to
Start