Carrier XRV Especificaciones descargar pdf (Pagina 57)

7. Press to access the holiday table. The Config-

uration 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 the

selected value.

11. Press to save the changes.

12. Press to return to the previous menu.

DAYLIGHT SAVING TIME CONFIGURATION — The

BRODEF table also defines Daylight Saving Time (DST)

changes. This feature is by default enabled, and the settings

should be reviewed and adjusted if desired. The following

line-item entries are configurable for both DST “Start” and

“Stop,” and they are defined in Table 8.

To disable the Daylight Savings Time function simply enter

0 minutes for “Start Advance” and “Stop Back.”

Table 8 — Daylight Saving Time Values

START-UP/SHUTDOWN/

RECYCLE SEQUENCE (Fig. 27)

Local Start-Up —

Local start-up (or a manual start-up) is

initiated by pressing the menu softkey on the default

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 25), Occupancy

Schedule (page 42), and To Prevent Accidental Start-Up

(page 78), and Fig. 18.

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 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 sched-

ule. 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 START CONTACT parameter on the MAIN-

STAT screen must be CLOSED. From the ICVC default

screen, press the and softkeys. Scroll to

highlight MAINSTAT and press the softkey. Scroll

down the MAINSTAT screen to highlight REMOTE START

CONTACT 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 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

CHILLED WATER DEADBAND. If the temperature is

less than or equal to this value, the PIC III turns off

the CONDENSER WATER PUMP relay and goes into a

RECYCLE mode.

ITEM DEFINITION

Month

1 = January, 2 = February, …,

12 = December.

Day of Week 1 = Monday,…, 7 = Sunday

Week

1 = first occurrence of selected Day of

Week in the selected month, 2 = second

occurrence of the selected Day, etc. This

is not necessarily what one would con-

clude from looking at a standard calendar.

For example, April 7, 2011, is Day 4 Week

1, but April 8, 2011, is Day 5 Week 2.

Time

Time of day in 24-hour format when the

time advance or set back will occur.

Advance/Back

“Advance” occurs first in the year, setting

the time ahead by the specified number of

minutes on the selected date. “Back” sets

the time back by the specified amount

(later in the year).

SELECT

INCREASE

DECREASE

ENTER

EXIT

Fig. 26 — Example of Holiday Period Screen

a19-1624

LOCAL

STATUS

SELECT

START

RELEASE

SCHEDULE

STATUS

SELECT

RELEASE

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 189 190

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