Shutdown - Carrier 19DV Series Installation, Operation And Maintenance Instructions

1: purge drain, 2: Cooler, 3: Pumpout drain, 4: High side float chamber, 5: sight glass, 6: strainer, 7: 3-way
actuated valve, 8: strainer, 9: pump, 10: 2-way actuated valve, 11: refrigerant filter, 12: bearing filter, 13: pumpout
drain.
Fig 37 – Lube control assembly schematic

4.3 Shutdown

The unit can be stopped locally using the HMI by pressing the green Start/Stop icon. The Unit Start/Stop screen is
displayed. Press Confirm Stop (see Fig. 38).
Fig. 38 — Confirm Stop
Chiller shutdown begins if any of the following occurs:
• Local OFF button is pressed
• A recycle condition is present
• The time schedule has gone into unoccupied mode when in Network or Local Schedule control mode
• The chiller protective limit has been reached and chiller is in alarm
• The start/stop status (CHIL_S_S) is overridden to stop from the network when in Network mode.
If the chiller is normally shut down from running; soft stop shutdown will be performed. The soft stop feature closes
the guide vanes of the compressor automatically if a non-alarm stop signal occurs before the compressor motor is
de-energized.
Any time the compressor is directed to stop (except in the cases of a fault shutdown), the guide vanes are directed
to close and VFD is directed to minimum speed for variable speed compressor, and the compressor shuts off
when any of the following is true:
• PERCENT LOAD CURRENT (%) drops below the SOFT STOP AMPS THRESHOLD
• ACTUAL GUIDE VANE OPENING drops below 4%
66