Carrier 23XL - START-UP;SHUTDOWN; RECYCLE SEQUENCE (Fig. 29); Local Start-Up

47
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 to access the
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
highlighted.
3. Once Equipment Configuration is highlighted, press
to access.
4. Press until HOLIDAYS is highlighted. This is
the Holiday Definition table.
5. Press to enter the Data Table Select
screen.This screen lists 18 holiday tables.
6. Press to highlight the holiday table that is to
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-
figuration Select table now shows the holiday start
month and day, and how many days the holiday period
will last.
8. Press or to highlight the month,
day, or duration.
9. Press to modify the month, day, or duration.
10. Press or to change these
lected value.
11. Press to save the changes.
12. Press to return to the previous menu.
START-UP/SHUTDOWN/
RECYCLE SEQUENCE (Fig. 29)
Local Start-Up —
Local start-up (or a manual start-up) is
initiated by pressing the menu softkey on the default
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 and
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.
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 softkey. This
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 and
softkeys. Scroll down and select the current
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 softkeys. Scroll to high-
light MAINSTAT and press the softkey. Scroll
down the STATUS01 screen to highlight
REMOTE CON-
TACTS INPUT
and press the softkey. Then, press
the softkey. To end the override, select
REMOTE
CONTACTS INPUT
and press the softkey.
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.
SERVICE
NEXT
SELECT
NEXT
SELECT
NEXT
SELECT
NEXT PREVIOUS
SELECT
INCREASE DECREASE
ENTER
EXIT
LOCAL
MENU STATUS
SELECT
START
RELEASE
MENU
SCHEDULE
MENU STATUS
SELECT
SELECT
CLOSE
RELEASE
23XL
Fig. 28 — Example of Holiday Period Screen