Trane Agility HDWA - Start-up Sequence: Stopped to Compressor Start

52
HDWA-SVX001D-EN
Stopped to Starting
The stopped to starting diagram shows the timing from
a stopped mode to energizing the compressor. The
shortest allowable time would be under the following
conditions:
• All temperatures below their starting limits
• Evaporator and condenser water flowing
• Power up start delay timer has expired
• Adjustable stop to start timer has expired
• Need to cool
The above conditions would allow the compressor to
start in 45 seconds.
Figure 36. Sequence of events: stopped to starting
Auto Waiting to Start Waiting to Start Starting Starting
Stopped
or
Run
Inhibit
Chiller Mode
Set to Auto
Need to Cool
(Satisfied Differential to Start)
MBC Clearance Check and
Levitate Bearings (~10 Seconds)
Confirm Condenser Water Flow
(6 Second Filter)
AFD Parking
(~8 Seconds)
Restart Inhibit Temperature Checks:
• Motor Winding Temp <90% of the
Motor Winding Temp Cutout
• AFD Heatsink Temp <90% of the
AFD Heatsink Temp Cutout
• MFC PCB Temp <90% of the PCB
Temp Cutout
• MBC Bearing Temps <90% of
Cutout
Confirm Evaporator
Water Flow
(6 Second Filter)
Energize Evaporator
Water Pump Relay
Confirm Evaporator
Water Flow in 20 Minutes
(6 Second Filter)
Levitate Bearings
Energize Condenser
Water Pump Relay
Confirm Cond Water
Flow in 20 Minutes
(6 Second Filter)
Evaporator EXV
Pre-position
MBC Cooling
Valve Closed
Economizer Valve
Closed
Drive Cooling
Valve Closed
Motor Cooling
Valve Closed
MBC Clearance Check
(if MBC Clearance Check =
Enabled)
IGV Closed
(Except for Rapid Restart)
SSttaarrtt--uupp aanndd SShhuutt--ddoowwnn