Start-Up/Shutdown/Recycle Sequence; Local Start-Up - Carrier 17 Start Up & Operation Manual

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
month, day, or duration.
9. Press SELECT
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.
EF, EX, FA CHLR HOLDY01S CONFIGURATION SELECT
Fig. 24 — Example of Holiday Period Screen
START-UP/SHUTDOWN/
RECYCLE SEQUENCE (Fig. 25)
→
Local 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 timer and the stop-to-start in-
hibit timer have expired.
PREVIOUS to highlight the
to modify the month, day, or
Local start-up (or a manual start-up)
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
and go into a RECYCLE mode. If the water/brine tempera-
ture is high enough, the start-up sequence continues on to
check the guide vane position. If the guide vanes are more
than 6% open, the start-up waits until the PIC closes the vanes.
If the vanes are closed, and the oil pump pressure is less
than 4 psid (28 kPad), the oil pump relay will then be en-
ergized. The PIC then waits until the OIL PRESS (Pressure)
VERIFY TIME (operator configured, default 15 seconds) for
oil pressure to reach 18 psid (124 kPad). After oil pressure
is verified, the PIC waits 15 seconds, and then the compres-
sor start relay (1CR) is energized to start the compressor.
Compressor ontime and service ontime timers start. Com-
pressor starts counter and number of starts over a 12-hour
period counter advance by one.
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) total compressor starts counter ad-
vances by one, number of starts over a 12-hour period ad-
vances by one.
E — Compressor motor starts, compressor ontime and service
ontime start, 15-minute inhibit timer starts (10 seconds af-
ter D)
F — SHUTDOWN INITIATED — Compressor motor stops, com-
pressor ontime and service ontime stops, stop-to-start in-
hibit timer starts.
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).
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Fig. 25 — Control Sequence
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