Carrier 23XL Dokumentacja Pobierz pdf (Strona 37)

4. Press NEXT until Holidef is highlighted. This is

the Holiday Deﬁnition table.

5. Press SELECT to enter the Data Table Select screen.

This screen lists 18 holiday tables.

6. Press NEXT to highlight the holiday table that you

wish to view or change. Each table is one holiday pe-

riod, starting on a speciﬁc date, and lasting up to

99 days.

7. Press SELECT 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 NEXT or PREVIOUS to highlight the month,

day, or duration.

9. Press SELECT to modify the month, day, or

duration.

10. Press INCREASE or DECREASE to change the se-

lected value.

11. Press ENTER to save the changes.

12. Press EXIT to return to the previous menu.

START-UP/SHUTDOWN/

RECYCLE SEQUENCE (Fig. 28)

Local Start-Up —

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

is initiated by pressing the LOCAL

menu softkey which is

on the LID default screen. Local start-up can proceed when

Time Schedule 01 is in OCCUPIED mode, and after the in-

ternal 15-minute start-to-start and the 1-minute stop-to-start

timer on PSIO Software Version 13 and higher have ex-

pired. PSIO Software Version 12 and lower has a 3-minute

stop-to-start timer.

The chiller start/stop status point on the Status01 table may

be overridden to start, regardless of the time schedule, in

order to locally start the unit. Also, the remote contacts may

be enabled through the LID and closed to initiate a start-up.

Whenever the chiller is in LOCAL control mode, the PIC

will wait for Time Schedule 01 to become occupied, and the

remote contacts to close, if enabled. The PIC will then per-

form a series of pre-start checks to verify that all

pre-start alerts and safeties are within the limits shown

in Table 4. The run status line on the LID now reads

‘‘Starting.’’ If the checks are successful, the chilled water/

brine pump relay will be energized. Five seconds later, the

condenser pump relay is energized. One minute later the PIC

monitors the chilled water and condenser ﬂow switches. The

PIC waits up to the WATER FLOW VERIFY TIME (operator

conﬁgured, default 5 minutes) to conﬁrm ﬂow. After ﬂow is

veriﬁed, the CHILLED WATER/BRINE temperature is com-

pared to CONTROL POINT plus DEADBAND. If the tem-

perature is less than or equal to the CONTROL POINT plus

DEADBAND, the PIC will turn off the condenser pump and

go into the RECYCLE mode. If the water/brine temperature

is high enough, the start-up sequence continues to check the

slide valve decrease timer. If the slide valve has been un-

loading for at least 3 minutes since the last machine shut-

down, then the refrigerant type is veriﬁed. The compressor

start relay (1CR) is energized to start the compressor 10 sec-

onds later.

Failure to verify any of the requirements up to this point

will result in the PIC aborting the start and displaying the

applicable pre-start mode of failure on the LID default screen.

A pre-start failure does not advance the starts in 12 hours

counter. Any failure after the 1CR relay has energized re-

sults in a safety shutdown, advances the starts in 12 hours

counter by one, and displays the applicable shutdown status

on the LID display.

Fig. 27 — Example of Holiday Period Screen

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 103 104

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