Specifications

ManualsBrandsCarrier ManualsWater DispenserEVERGREEN 23XRV

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.

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 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

parameter 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 21), Occupancy

Schedule (page 35), and To Prevent Accidental Start-Up

(page 65), and Fig. 20.

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 soft-

keys. Scroll to highlight MAINSTAT. Press the

softkey. Highlight and select 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 and select 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. Scroll down and select OVERRIDE, and set the

desired override time period.

Another condition for start-up must be met for chillers that

have the REMOTE CONTACTS OPTION on the EQUIP-

MENT SERVICE, OPTIONS screen set to ENABLE. For

these chillers, the REMOTE START CONTACT parameter on

the MAINSTAT screen must be CLOSED. From the ICVC

default screen, press the and softkeys.

Scroll to high-light MAINSTAT and press the soft-

key. Scroll down the MAINSTAT screen to highlight

REMOTE START CONTACT and press the soft-

key. Press the softkey to initiate the override. To end

the override, select REMOTE START CONTACT 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 5. 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. Failure

to verify any of the requirements up to this point will result in

the PIC III aborting the start and displaying the applicable

pre-start alert on the ICVC default screen. A pre-start alert does

not advance the starts in 12 hours counter. If the tests are

successful, the chilled liquid pump relay energizes, and the

MAINSTAT screen line now reads STARTUP.

Five seconds later, the condenser pump relay energizes.

Thirty seconds later the PIC III monitors the chilled liquid and

condenser liquid flow devices and waits until the LIQUID

FLOW VERIFY TIME (operator-configured, default 5 minutes)

expires to confirm flow. After flow is verified, the chilled

liquid temperature is compared to CONTROL POINT plus

CHILLED LIQUID DEADBAND. If the temperature is less

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

pump relay and goes into a RECYCLE mode.

NOTE: The 23XRV chillers are not available with factory-

installed external chilled liquid flow or condenser liquid

flow devices. These are available as an accessory for use

with the CCM control board.

If the liquid temperature is high enough to require cooling,

the start-up sequence continues. Tower fan control is enabled

and the oil pump starts. Oil pressure is verified between 45 sec-

onds and 5 minutes. The VFD is set to START following oil

pressure verification and the controls verify that no faults exist.

Proper compressor rotation is verified by monitoring the

discharge pressure.

The control center monitors load current to verify that the

compressor is running then steps the compressor up to target

speed. The start-to-start timer and Service On time timers are

activated when compressor operation is confirmed.

The controls will abort the start and display the applicable

pre-start alert on the ICVC if any of the conditions above are

not verified. Any fault after the startup process is complete

results in a safety shutdown, advancing the STARTS IN

12 HOURS counter by one, and display of the applicable shut-

down status on the ICVC display.

Compressor ontime and service ontime timers start, and the

compressor STARTS IN 12 HOURS counter in the MAIN-

STAT screen and the TOTAL COMPRESSOR STARTS coun-

ter advance by one.

SELECT

INCREASE

DECREASE

ENTER

EXIT

23XRPIC3

Fig. 26 — Example of Holiday Period Screen

a23-1612

LOCAL

STATUS

SELECT

START

RELEASE

SCHEDULE

STATUS

SELECT

RELEASE