Carrier AquaEdge 19XR - Start-Up Procedures; Start-Up;Shutdown; Recycle Sequence; Local Start;Stop Control

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START-UP/SHUTDOWN/
RECYCLE SEQUENCE
Local Start/Stop Control
Local start-up (or manual start-up) is initiated by pressing the
gray Start/Stop icon on the HMI interface. See Fig. 14. Note the
display may change based on product type and options selected.
Fig. 14 — Chiller Start/Stop Icon
This initiates the PIC 6 starting sequence by displaying the list of
operating modes. Press Local On to initiate start-up. See Fig. 15.
Fig. 15 — Local On
NOTE: Prior to start-up, the start-to-start timer and the stop-to-
start timer must have elapsed and all alarms must be cleared
(see Troubleshooting Guide section on page 51).
When start-up is initiated, the status screen displays start-up prog-
ress and the Start/Stop icon blinks green. Once local start-up
begins, the PIC 6 control system performs a series of pre-start tests
to verify that all pre-start alerts and safeties are within acceptable
limits. Table 2 shows appropriate Prestart Alerts/Alarms condi-
tions. If a test is not successful, the start-up is delayed or aborted.
If the tests are successful, the start-up will be in progress and the
COMPRESSOR RUN STATUS shall be “Startup.” The control
shall then energize the chilled water/brine pump relay.
Five seconds later, the condenser pump relay energizes. Thirty
seconds later the PIC 6 control system monitors the chilled water
and condenser water flow devices and waits until the WATER
FLOW VERIFY TIME (operator-configured, default 5 minutes)
expires to confirm flow. After flow is verified, the chilled water
temperature is compared to CONTROL POINT plus 1/2
CHILLED WATER DEADBAND. If the temperature is less than
or equal to this value, the PIC 6 control system turns off the con-
denser pump relay and goes into a Recycle mode.
If the water/brine temperature is high enough, the start-up se-
quence continues and checks the guide vane position. If the
guide vanes are more than 4% open, the start-up waits until the
PIC 6 control system closes the vanes. If the vanes are closed
and the oil pump pressure is less than 6 psi (41.4 kPa), the oil
pump relay energizes. The PIC 6 control system then waits until
the oil pressure (OIL PRESS VERIFY TIME, operator-config-
ured, default of 40 seconds) reaches 18 psi (124 kPa) which indi-
cates satisfactorily oil pump pressure to continue start-up. After
oil pressure is verified, the PIC control system waits 40 seconds,
and the compressor start relay energizes to start the compressor.
Compressor ontime and service ontime timers start, and the
compressor STARTS IN 12 HOURS counter and the number of
starts over a 12-hour period counter advance by one.
Failure to verify any of the requirements up to this point will result
in the PIC 6 control system aborting the start and displaying the
applicable pre-start alert alarm state number near the bottom of the
home screen on the HMI panel. A prestart failure does not ad-
vance the STARTS IN 12 HOURS counter. Any failure after the
start command relay has energized results in a safety shutdown,
advances the starts in 12 hours counter by one, and displays the
applicable shutdown status on the display.
For normal start-up the minimum time to complete the entire
prestart sequence is approximately 185 seconds. See Fig. 16
for normal start-up timing sequence. See Table 2 for a list of
prestart checks.
Table 2 — Prestart Checks
* If Prestart Check Condition is True, then resulting State is as indicated in the
State Number column.
†
See the Controls Operation and Troubleshooting guide for alarm and alert codes.
** Refrig trip point = 33°F (0.6°C) (water) and configurable for brine application.
PRESTART CHECK CONDITION*
STATE
NUMBER
†
STARTS IN 12 HOURS 8 (not counting recycle restarts or auto
restarts after power failure)
Alert – 100
OIL SUMP TEMP 140°F (60°C) and
OIL SUMP TEMP EVAP_SAT + 50°F (27.8°C)
Alert – 101
COND PRESSURE COND PRESS OVERRIDE – 20 psi Alert – 102
#RECYCLE RESTARTS LAST 4 HOURS > 5 Alert – 103
COMP BEARING TEMPS  COMP BEARING ALERT– 10°F (5.6°C) Alarm – 230
COMP MOTOR WINDING TEMP  MOTOR TEMP OVERRIDE –
10°F (5.6°C)
Alarm – 231
COMP DISCHARGE TEMPERATURE COMP DISCHARGE
ALERT– 10°F (5.6°C)
Alarm – 232
EVAP REFRIG LIQUID TEMP OR EVAP_SAT
< EV
AP REFRIG TRIPPOINT + EVAP OVERRIDE DELTA T
Al
arm – 233
AVERAGE LINE VOLTAGE UNDERVOLTAGE THRESHOLD Alarm – 234
AVERAGE LINE VOLTAGE OVERVOLTAGE
THRESHOLD
Alarm – 235
CHECK FOR GUIDE VANE CALIBRATION Alarm – 236