Start-Up/Shutdown/Recycle; Sequence; Local Start-Up; Controls - Carrier 23xl Start-Up, Operation And Maintenance Instructions Manual

days of the week field signifies that the period is applicable to a
holiday. (See Fig. 22.)
The broadcast function must be activated for the holidays
configured on the HOLIDEF screen to work properly. Access
the BRODEF screen from the EQUIPMENT CONFIGURA-
TION table and select ENABLE to activate function. Note that
when the chiller is connected to a CCN Network, only one
chiller or CCN device can be configured as the broadcast de-
vice. The controller that is configured as the broadcaster is the
device responsible for transmitting holiday, time, and daylight-
savings dates throughout the network.
To access the BRODEF screen, see the SERVICE menu
structure, Fig. 21.
To view or change the holiday periods for up to 18 different
holidays, perform the following operation:
1. At the Menu screen, press
Service menu.
2. If not logged on, follow the instructions for ATTACH
TO NETWORK DEVICE or To Log Out. Once logged
on, press until Equipment Configuration is
NEXT
highlighted.
3. Once Equipment Configuration is highlighted, press
to access.
SELECT
4. Press until HOLIDAYS is highlighted. This is
NEXT
the Holiday Definition table.
5. Press to enter the Data Table Select
SELECT
screen.This screen lists 18 holiday tables.
6. Press to highlight the holiday table that is to
NEXT
be viewed or changed. Each table is one holiday
period, starting on a specific date, and lasting up to 99
days.
7. Press to access the holiday table. The Con-
SELECT
figuration Select table now shows the holiday start
month and day, and how many days the holiday period
will last.
8. Press or
NEXT PREVIOUS
day, or duration.
9. Press to modify the month, day, or duration.
SELECT
10. Press or
INCREASE
lected value.
11. Press to save the changes.
ENTER
12. Press to return to the previous menu.
EXIT
23XL
Fig. 28 — Example of Holiday Period Screen
to access the
SERVICE
to highlight the month,
to change these
DECREASE
START-UP/SHUTDOWN/
RECYCLE SEQUENCE (Fig. 29)
Local Start-Up —
initiated by pressing the
CVC screen. Local start-up can proceed when the chiller
schedule indicates that the current time and date have been
established as a run time and date, and after the internal
15-minute start-to-start and the 1-minute stop-to-start inhibit
timers have expired. These timers are represented in the START
INHIBIT TIMER and can be viewed on the MAINSTAT screen
and DEFAULT screen. The timer must expire before the chiller
will start. If the timers have not expired the RUN STATUS pa-
rameter on the MAINSTAT screen now reads 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 37), and To Prevent Accidental Start-Up
(page 66), and Fig. 22.
If the OCCUPIED ? parameter on the MAINSTAT screen
is set to NO, the chiller can be forced to start as follows. From
the default CVC 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
schedule. 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 CONTACTS INPUT parameter on the MAIN-
STAT screen must be CLOSED. From the CVC default screen,
press the and
MENU
light MAINSTAT and press the
down the STATUS01 screen to highlight REMOTE CON-
TACTS INPUT and press the
the CLOSE softkey. To end the override, select REMOTE
CONTACTS INPUT and press the
Once local start-up begins, the PIC II performs a series of
pre-start tests to verify that all pre-start alerts and safeties are
within the limits shown in Table 4. 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/brine pump relay ener-
gizes, and the MAINSTAT screen line now reads STARTUP.
Five seconds later, the condenser pump relay energizes.
Thirty seconds later the PIC II 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 II turns off the condenser
pump relay and goes into a RECYCLE mode.
47
Local start-up (or a manual start-up) is
menu softkey on the default
LOCAL
and
MENU STATUS
SELECT
RELEASE softkey. This
MENU
softkeys. Scroll to high-
STATUS
SELECT softkey. Scroll
softkey. Then, press
SELECT
softkey.
RELEASE
and