Power Up To Starting - Trane Optimus RTHD Installation, Operation And Maintenance Manual

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
Figure 27. Sequence of events: power up to starting
Last Mode
was Auto
Power Power
Applied Up
Confirm Evaporator
Symbio™ 800
Boot Time
(15 Sec)
(6 Second Filter)
Enforce Power Up
Start Delay Timer
RTHD-SVX01K-EN
Call for
Cooling
Waiting to
Auto
Start
Enforce Restart
Confirm Condenser
Water Flow Inhibit Timer
(0 to 30 mins)
Enforce 'Cond Pmp (6 Second Filter)
Strt Delay'
(0 to 300 Sec)
(0 to 30 mins)
Energize Evaporator
Water Pump Relay
Confirm Evaporator Water
Flow Within 20 minutes
(6 Sec Filter)
Oil Heater always energized
when compressor is de-energized
Overdrive EXV Open
• 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.
Waiting to
Waiting to
Waiting to
Start Start
Condenser
Enforce 'Cprsr
Water Pump
Water Flow Strt Delay'
Pre-Run
(0 to 30 mins) (0 to 300 Sec)
Energize Condenser
Water Pump Relay
Confirm Condenser Water
Flow Within 20 minutes
(6 Sec Filter)
Start-Up and Shutdown
Waiting to
Start
Start
Confirm Presence of
Oil With Optical Oil
Sensor
(0 to 2 mins)
Energize Unload
Solenoid
Pre-Position EXV
Starting
Compressor
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