Carrier AquaEdge 19MV, Start-Up, Operation And Maintenance Instructions Manual

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vanes are more than 4% open, the start-up waits until the PIC6
control system closes the vanes.
Compressor ontime and service ontime timers start, and the com-
pressor STARTS IN 12 HOURS counter and the number of starts
over a 12-hour period counter advance by one.
Failure to verify any of the requirements up to this point will re-
sult in the PIC6 control system aborting the start and displaying
the applicable prestart alert alarm state number near the bottom
of the home screen on the HMI panel. A prestart failure does not
advance the STARTS IN 12 HOURS counter. Any failure after
the 1CR/Start relay has energized results in a safety shutdown,
advances the starts in 12 hours counter by one, and displays the
applicable shutdown status on the display.
The minimum time to complete the entire prestart sequence is ap-
proximately 185 seconds. See Fig. 11 for normal start-up timing
sequence. See Table 2 for a list of prestart checks.
Table 2 — Prestart Checks
* If Prestart Check Condition is True, then resulting State is as indicated in the State Number column.
† See the Controls Operation and Troubleshooting guide for alarm and alert codes.
** Refrig trip = 33°F (0.6°C) (water) or and configurable for (brine) applications.
Fig. 11 — Control Timing Sequence for Normal Start-Up
PRESTART CHECK CONDITION* STATE NUMBER†
STARTS IN 12 HOURS

8 (not counting recycle restarts or auto restarts after power failure) and Frequent Start
Option is not enabled. If Frequent Restart Option is enabled then STARTS IN 12 HOURS

24
Alert 100
COND PRESSURE

COND PRESS OVERRIDE Alert 102
# Recycle restarts in the last 4 hours > 5 if Frequent Start Option is not Enabled.

RECYCLE RESTARTS LAST 1 HOURS > 4 if Frequent Start Option is Enabled.
Alert 103
MBC ALERT Alert 106
MBC NOT READY TO LEVITATE Alert 115
COMP MOTOR WINDING TEMP

COMP MOTOR WINDING

– 10°F (5.6°C) Alarm 231
COMP DISCHARGE TEMPERATURE

COMP DISCHARGE ALERT

– 10°F (5.6°C) Alarm 232
EVAP_SAT < refrig trip** + EVAP OVERRIDE DELTA T
Alarm 233
EVAP REFRIG LIQUID TEMP < refrig trip** + EVAP OVERRIDE DELTA T
AVERAGE LINE VOLTAGE

UNDERVOLTAGE THRESHOLD Alarm 234
AVERAGE LINE VOLTAGE

OVERVOLTAGE THRESHOLD Alarm 235
GUIDE VANE 1 CALIBRATION NOT COMPLETED Alarm 236
GUIDE VANE 2 CALIBRATION NOT COMPLETED Alarm 238
EXCSV (EXPANSION CONTROL SYSTEM VALVE) CALIBRATION NOT COMPLETED Alarm 242
POWER PANEL OVER TEMPERATURE Alarm 243
MBC UNABLE TO LEVITATE Alarm 456
A
START INITIATED: prestart checks are made; evaporator pump
started.*
B Condenser water pump started (1 second after A).
C
Water flows verified (5 seconds to 5 minutes maximum after B).
Chilled water temperatures checked against control point. Guide
vanes checked for closure. Tower fan control enabled.
D
Ref pressure verified (15 seconds minimum, 300 seconds maxi-
mum after C). Levitate rotor shaft and check 10s later that MBC
indicates levitation successful.
E
Compressor motor starts; compressor on-time and service on-time
start, 15-minute inhibit timer starts (10 seconds after D), total com-
pressor starts advances by one, and the number of starts over a
12-hour period advances by one.
F
Shutdown initiated; Compressor motor stops; compressor on-time
and service on-time stop, and 2-minute inhibit timer starts.
G
De-levitate rotor shaft and evaporator pumps de-energized
(120 seconds after F). Condenser pump and tower fan control may
continue 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 2 minutes after F).
* Auto Restart After Power Failure Timing sequence will be faster.
MACHINE SAFETIES
EVAPORATOR PUMP
CONDENSER
WATER PUMP
WATER FLOW, CHILLED WATER
TEMP, GUIDE VANES, REF PUMP,
TOWER FAN CONTROL
LEVITATE ROTOR SHAFT
COMPRESSOR,
COMPRESSOR ONTIME,
SERVICE ONTIME
15-MINUTE
START-TO-START
2-MINUTE
STOP-TO-START