Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual page 14

STARTS IN 12 HOURS 8 (not counting recycle restarts or auto restarts after power failure)
COND PRESSURE COND PRESS OVERRIDE – 20 psi
#RECYCLE RESTARTS LAST 4 HOURS > 5
COMP BEARING TEMP >= COMP BEARING ALERT– 10°F (5.6°C)
COMP MOTOR WINDING TEMP COMP MOTOR WINDING– 10°F (5.6°C)
COMP DISCHARGE TEMPERATURE COMP DISCHARGE ALERT– 10°F (5.6°C)
EVAP_SAT <Evap trip point** + EVAP OVERRIDE DELTA T
EVAP REFRIG LIQUID TEMP <Evap trip point** + EVAP OVERRIDE DELTA T
AVERAGE LINE VOLTAGE UNDERVOLTAGE THRESHOLD
AVERAGE LINE VOLTAGE OVERVOLTAGE THRESHOLD
CHECK FOR GUIDE VANE 1 CALIBRATION
CHECK FOR GUIDE VANE 2 CALIBRATION
* If Prestart Check Condition is True, then resulting State is as indi-
cated in the State Number column.
† See the Controls Operation and Troubleshooting guide for alarm
and alert codes.
MACHINE SAFETIES
EVAPORATOR PUMP
CONDENSER
WATER PUMP
WATER FLOW, CHILLED WATER
TEMP, GUIDE VANES, REF PUMP,
TOWER FAN CONTROL
REF PUMP
COMPRESSOR,
COMPRESSOR ONTIME,
SERVICE ONTIME
15-MINUTE
START-TO-START
2-MINUTE
STOP-TO-START
3-WAY
ACTUATED
VALVE
Table 2 — Prestart Checks
PRESTART CHECK CONDITION*
Fig. 12 — Control Timing Sequence for Normal Start-Up
PURGE DRAIN
STRAINER SIGHT GLASS
STRAINER
2-WAY
ACTUATED VALVE
PUMP
Fig. 13 — Lube Assembly Schematic
††
††
** Evap trip point = 33°F (0.6°C) (water) or EVAP REFRIG TRIP-
POINT (brine).
†† Condition ignored for Eaton/Rockwell VFDs.
START INITIATED: prestart checks are made; evaporator
A
pump started.*
B Condenser water pump started (5 seconds after A).
Water flows verified (30 seconds to 5 minutes maximum
after B). Chilled water temperatures checked against control
C
point. Guide vanes checked for closure. Refrigerant pump
started; tower fan control enabled.
Ref pressure verified (15 seconds minimum, 300 seconds
D
maximum after C).
Compressor motor starts; compressor on-time and service
on-time start, 15-minute inhibit timer starts (10 seconds after
E
D), total compressor starts advances by one, and the num-
ber of starts over a 12-hour period advances by one.
SHUTDOWN INITIATED; Compressor motor stops; com-
F pressor on-time and service on-time stop, and 2-minute
inhibit timer starts.
Refrigerant pump and evaporator pumps de-energized
(120 seconds after F).Condenser pump and tower fan con-
G
trol may continue to operate if condenser pressure is high.
Evaporator pump may continue if in RECYCLE mode.
Restart permitted (both inhibit timers expired: minimum of
O/A
15 minutes after E; minimum of 2 minutes after F).
*
Auto Restart After Power Failure Timing sequence will be faster.
COOLER
REFRIGERANT FILTER
14
STATE NUMBER
Alert – 100
Alert – 102
Alert – 103
Alarm – 230
Alarm – 231
Alarm – 232
Alarm – 233
Alarm – 233
Alarm – 234
Alarm – 235
Alarm – 236
Alarm – 238
HS FLOAT CHAMBER
BEARING
SUPPLY
BEARING FILTER
PUMPOUT
DRAIN
†