Start-Up/Shutdown/Recycle; Sequence; Local Start-Up - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

START-UP/SHUTDOWN/
RECYCLE SEQUENCE (Fig. 27)
Local start-up (or a manual start-up) is
Local Start-Up —
initiated by pressing the LOCAL
ICVC screen. Local start-up can proceed when the chiller
schedule indicates that the CURRENT TIME and CURRENT
DATE have been established as a run time and date, and after
the internal timers have expired. The timers include a
15-minute start-to-start timer and a 1-minute stop-to-start tim-
er, which together serve to prevent excessive cycling and abuse
of the motor. The value of these timers is displayed as START
INHIBIT TIMER and can be viewed on the MAINSTAT and
DEFAULT screens. Both timers must expire before the chiller
will start. If the timers have not expired, the RUN STATUS
parameter on the MAINSTAT screen will read TIMEOUT.
NOTE: The time schedule is said to be "occupied" if the
OCCUPIED ? parameter on the MAINSTAT screen is set to
YES. For more information on occupancy schedules, see the
sections on Time Schedule Operation (page 24), Occupancy
Schedule (page 39), and To Prevent Accidental Start-Up
(page 70), and Fig. 19.
If the OCCUPIED ? parameter on the MAINSTAT screen
is set to NO, the chiller can be forced to start as follows. From
the default ICVC screen, press the
softkeys. Scroll to highlight MAINSTAT. Press the
softkey. Scroll to highlight CHILLER START/STOP. Press the
softkey to override the schedule and start the chiller.
START
NOTE: The chiller will continue to run until this forced start is
released, regardless of the programmed schedule. To release
the forced start, highlight CHILLER START/STOP from the
MAINSTAT screen and press the
action returns the chiller to the start and stop times established
by the schedule.
The chiller may also be started by overriding the time sched-
ule. From the default screen, press the
softkeys. Scroll down and select the current
SCHEDULE
schedule. Select OVERRIDE, and set the desired override time.
Another condition for start-up must be met for chillers that
have the REMOTE CONTACTS OPTION on the EQUIP-
MENT SERVICE screen set to ENABLE. For these chillers,
the REMOTE START CONTACT parameter on the MAIN-
STAT screen must be CLOSED. From the ICVC default
QUANTITY CHECKED
STARTS IN 12 HOURS
COMP THRUST BRG TEMP
COMP MOTOR WINDING TEMP
COMP DISCHARGE TEMP
EVAPORATOR REFRIG TEMP
OIL SUMP TEMP
CONDENSER PRESSURE
PERCENT LINE VOLTAGE
PERCENT LINE VOLTAGE
ACTUAL GUIDE VANE POS
RECTIFIER TEMPERATURE
INVERTER TEMPERATURE
menu softkey on the default
and
MENU STATUS
SELECT
softkey. This
RELEASE
and
MENU
Table 9 — Prestart Checks
REQUIREMENT
< 8 (not counting recycle restarts or auto restarts after power failure)
ALERT is cleared once RESET is pressed.
< [COMP THRUST BRG ALERT] –10° F (5.6° C)
< [COMP MOTOR TEMP OVERRIDE] –10° F (5.6° C)
< [COMP DISCHARGE ALERT] –10° F (5.6° C)
< [EVAP REFRIG TRIPPOINT] + [REFRIG OVERRIDE DELTA T]
< 150° F (65.5° C) or <[EVAPORATOR REFRIG TEMP] + 50° F (27.8° C)
< [COND PRESS OVERRIDE] –20 PSI (138 kPa) and
< 145 psi (1000 kPa)
< [Undervoltage Threshold]
> [Overvoltage Threshold]
Controls test guide vane calibration must be performed
< RECTIFIER TEMP OVERRIDE – 20° F (11.1° C)
< INVERTER TEMP OVERRIDE – 20° F (11.1° C)
screen, press the
MENU
highlight MAINSTAT and press the
down the MAINSTAT screen to highlight REMOTE START
CONTACT and press the
softkey. To end the override, select REMOTE
CLOSE
CONTACTS INPUT and press the
Once local start-up begins, the PIC III performs a series of
pre-start tests to verify that all pre-start alerts and safeties are
within the limits shown in Table 7. The RUN STATUS parame-
ter on the MAINSTAT screen line now reads PRESTART. If a
test is not successful, the start-up is delayed or aborted. If the
tests are successful, the CHILLED WATER PUMP relay ener-
gizes, and the RUN STATUS line now reads STARTUP. See
Table 9.
Five seconds later, the CONDENSER WATER PUMP relay
energizes. Thirty seconds later, the PIC III 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 / CHILLED WATER DEADBAND. If the temperature is
2
less than or equal to this value, the PIC III turns off
the CONDENSER WATER PUMP relay and goes into a
RECYCLE mode.
NOTE: The 19XRV units are not available with factory-
installed chilled water or condenser water flow devices (avail-
able as an accessory for use with the CCM control board).
If the water/brine temperature is high enough, the start-up
sequence continues and checks the guide vane position. If the
guide vanes are more than 4% open, the start-up is delayed
until the PIC III closes the vanes. If the vanes are closed and
the oil pump pressure is less than 4 psi (28 kPa), the oil pump
relay energizes. The PIC III then waits until the oil pressure
(OIL PRESS VERIFY TIME, operator-configured, default of
40 seconds) reaches a maximum of 18 psi (124 kPa). After oil
pressure is verified, the PIC III waits 40 seconds, and the VFD
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 III aborting the start and displaying the appli-
cable pre-start mode of failure on the ICVC default screen. A
pre-start failure does not advance the STARTS IN 12 HOURS
counter. Any failure after the VFD has energized results in a
safety shutdown, advances the starts in 12 hours counter by
one, and displays the applicable shutdown status on the ICVC
display. The minimum time to complete the entire prestart
sequence is approximately 185 seconds.
53
and softkeys. Scroll to
STATUS
softkey. Scroll
SELECT
softkey. Then, press the
SELECT
softkey.
RELEASE
ALERT STATE IF FALSE
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