Start-Up/Shutdown/Recycle; Sequence; Local Start-Up; Controls - Carrier 19XL Start-Up, Operation And Maintenance Instructions Manual

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
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.
Fig. 23 — Example of Holiday Period Screen
to highlight the
39

START-UP/SHUTDOWN/RECYCLE

SEQUENCE (Fig. 24)
Local Start-Up —
Local start-up (or a manual start-up)
is initiated by pressing the LOCAL menu softkey which is
on the default LID 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 3-minute stop-to-start
inhibit timers have expired (on PSIO software Version 08
and lower or a 1-minute stop-to-start timer on PSIO Soft-
ware Version 09 and higher).
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 3.
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. Thirty seconds later the PIC monitors the chilled
water and condenser water flow switches, and waits until the
WATER FLOW VERIFY TIME (operator configured, default
5 minutes) to confirm flow. After flow is verified, the chilled
water/brine temperature is compared to CONTROL POINT
plus DEADBAND. If the temperature is less than or equal to
this value, the PIC will turn off the condenser pump relay
A — START INITIATED — Prestart checks made; evaporator
pump started
B — Condenser water pump started (5 seconds after A)
C — Water flows verified (30 seconds to 5 minutes maximum
after B). Chilled water temperatures checked against con-
trol point. Guide vanes checked for closure. Oil pump started;
tower fan control enabled.
D — Oil pressure verified (30 seconds minimum, 300 seconds
maximum after C)
E — Compressor motor starts, compressor ontime and serv-
ice ontime start, 15-minute inhibit timer starts (10 seconds
after D), total compressor starts advances by one, number
of starts over a 12-hour period advances by one
F — SHUTDOWN INITIATED — Compressor motor stops, com-
pressor ontime and service ontime stops, 3-minute inhibit
timer starts on PSIO Software Version 08 and lower and
1-minute inhibit timer starts for PSIO Software Version 09
and higher.
G — Oil pump and evaporator pumps deenergized (60 seconds
after F). Condenser pump and tower fan control may con-
tinue to operate if condenser pressure is high. Evaporator
pump may continue if in RECYCLE mode.
O/A — Restart permitted (both inhibit timers expired) (minimum of
15 minutes after E; [minimum of 3 minutes after F on PSIO
Software Version 08 and lower] [minimum of 1 minute after
F on PSIO Software Version 09 and higher]
Fig. 24 — Control Sequence