HDWA-SVX002C-EN
55
Stopped to Starting — Heating Mode
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 heat
The above conditions would allow the compressor to start
in 45 seconds.
Figure 38. Sequence of events: stopped to starting — heating mode
Stopped
or
Run
Inhibit
Chiller Mode
Set to Auto
Auto
Waiting to Start
Start
Compressor
Energize Condenser
Water Pump Relay
Energize Evaporator
Water Pump Relay
Confirm Condenser Water
Flow in 20 minutes
(6 Sec Filter)
Confirm Evaporator
Water Flow in 20 mins
(6 Sec Filter)
Waiting to Start
Confirm Evaporator Water Flow
(6 sec Filter)
Confirm Cond Water Flow
(6 Sec Filter)
Temperature checks:
Motor Winding Temp < 90% of the Motor
Winding Temp Cutout
AFD Heatsink Temp < 90% of the AFD Heatsink
Temp Cutout
MBC PCB Temp < 90% of the PCB Temp Cutout
MBC Bearing Temps < 90% of Cutout
Levitate Bearings
MBC Valve Closed
Economizer Valve
Closed
Drive Cooling Valve
Closed
Motor Cooling
Valve Closed
Evaporator EXV
Pre-position
Need to Heat
(Satisfied Diff to Start)
Starting
Levitate Bearings
MBC Clearance Check
(if MBC Clearance Check =Enabled)
Start-up and Shutdown
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