Chiller Start-Up Sequence; Startup - Carrier AquaEdge 19XR Controls Operation And Troubleshooting

Table 11 — Compressor Run Status
STATUS STATUS
NO. NAME
0 OFF STATSTOP is STOP, no alarm.
1 CTLTEST Controls Test is active.
2 PUMPDOWN Pumpdown is active.
3 LOCKOUT Lockout is active.
Recycle shutdown completed on low
4 RECYCLE load in effect until the need for cooling
resumes; non-fault condition.
Shutdown completed due to alarm fault
5 TRIPOUT
condition.
The controller is delaying the start
6 TIMEOUT sequence until the Start to Start or Stop
to Start timers have elapsed.
The chiller is in the process of system
7 PRESTART checking before energizing the compres-
sor motor.
8

STARTUP

Normal start-up in progress.
9 AUTORST Auto Restart in progress.
Ramp loading in progress. The chiller
has started and is gradually increasing
10 RAMPING
its load to control electrical demand
charges.
The chiller has completed ramp loading
11 RUNNING following start-up. Normal running mode,
no override or demand limit.
12 OVERRIDE Running with Override active.
Running with Demand Limit active. The
chiller is prevented from loading further
13 DEMAND because it has reached an AVERAGE
LOAD CURRENT limit or a MOTOR
KILOWATTS limit.
14 SHUTDOWN Compressor shutdown in progress.
15 FREECOOL Free Cooling in Progress
Condenser Flush in Progress (Note:
16 CONDFLSH
Available for "Marine Option" only).

Chiller Start-Up Sequence

PRE-START CHECK — Once start-up begins, the controller
performs a series of pre-start tests to verify that all pre-start
alerts and safeties are within limits. Progress is shown on the
Startup Sequence screen (see Fig. 30). This screen can be ac-
cessed by touching the mode title (top blue bar) of the home
screen. Table 12 lists pre-start alert and alarm conditions.
Fig. 30 — Start-Up Sequence Screen
DESCRIPTION
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Table 12 — Pre-Start Alerts and Alarms
PRE-START ALERT
CONDITION
STARTS IN 12 HOURS >= 8
OIL SUMP TEMP <= 140 F (60 C) AND OIL
SUMP TEMP <= EVAP_SAT + 50 F (27.8 C)
CONDENSER PRESSURE >=
COND PRESS OVERRIDE – 20 psi
Number of recycle restart in the last 4 hours is
greater than 5
COMP BEARING TEMP >= COMP BEARING
ALERT– 10 F (5.5 C)
COMP MOTOR WINDING TEMP >= MOTOR
TEMP OVERRIDE – 10 F (5.5 C)
COMP DISCHARGE TEMP >= COMP DIS-
CHARGE ALERT– 10 F (5.5 C)
EVAP_SAT < Evap trip point* +
EVAP OVERRIDE DELTA T
or
EVAP REFRIG LIQUID TEMP < Evap trip
point* + EVAP OVERRIDE DELTA T
ACTUAL LINE VOLTAGE <=
UNDERVOLTAGE THRESHOLD
(n/a for UM VFDs)
ACTUAL LINE VOLTAGE >=
OVERVOLTAGE THRESHOLD
(n/a for UM VFDs)
Guide vane 1 has not been calibrated success-
fully
*Evap trip point = 33 F (0.6 C) (water) or EVAP REFRIG TRIPPOINT
(brine).
The compressor RUN STATUS parameter on the default
screen line now reads PRESTART. If a test is not successful,
the start-up is delayed or aborted. If all tests are successful, the
chilled water pump relay energizes, and the main screen line
now reads STARTUP.
START-UP — One second after the successful pre-start
check, the chilled water and condenser water pump relays are
energized.
Five seconds later, the control monitors the chilled water
and condenser water flow devices and waits until the WATER
FLOW VERIFY TIME (service-configured, default 5 minutes)
expires to confirm water flow.
After water flow is verified, the water temperature is com-
pared to CONTROL POINT +
BAND. If the temperature is less than or equal to this value, the
control turns off the condenser pump relay and goes into RE-
CYCLE mode.
If the RECYCLE condition is not satisfied, the start-up se-
quence continues and checks the guide vane position. For a sin-
gle-stage compressor (Comp [Single = 0, Dual = 1] = 0 in
FACTORY configuration), if the guide vanes are more than
"GUIDE VANE CLOSURE AT STARTUP (default 4%)" %
open, the start-up waits until the controller closes the vanes.
For a dual-stage compressor (Comp [Single = 0, Dual = 1] = 1
in FACTORY configuration), the guide vanes are opened to the
initial position specified with GV1 Closure at Startup in the
Option Configuration menu.
If an EC/HGBP or economizer damper valve is equipped
and enabled, the control checks that the position of these valves
is fully closed.
If the vanes and valves position are verified and the oil
pump pressure difference is less than 6 psi (41.4 kPa), the oil
pump relay is energized.
The control then waits until the oil pressure difference (OIL
PRESS VERIFY TIME, operator-configured, default 40 sec-
onds) reaches a maximum of 18 psi (124 kPa). After oil pres-
sure is verified, the control waits 40 seconds for oil prelube, and
the compressor start relay energizes to start the compressor.
ALARM
STATE
OR
NO.
ALERT
100 Alert
101 Alert
102 Alert
103 Alert
230 Alarm
231 Alarm
232 Alarm
233 Alarm
234 Alarm
235 Alarm
236 Alarm
/ CHILLED WATER DEAD-
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