14
Fig. 12 — Control Timing Sequence for Normal Start-Up
Fig. 13 — Lube Assembly Schematic
Table 2 — Prestart Checks
* 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.
** Evap trip point = 33°F (0.6°C) (water) or EVAP REFRIG TRIP-
POINT (brine).
††Condition ignored for Eaton/Rockwell VFDs.
A
START INITIATED: prestart checks are made; cooler 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 control
point. Guide vanes checked for closure. Refrigerant pump
started; tower fan control enabled.
D
Ref pressure verified (15 seconds minimum, 300 seconds
maximum after C).
E
Compressor motor starts; compressor on-time and service
on-time start, 15-minute inhibit timer starts (10 seconds after
D), total compressor starts advances by one, and the num-
ber of starts over a 12-hour period advances by one.
F
SHUTDOWN INITIATED; Compressor motor stops; com-
pressor on-time and service on-time stop, and 2-minute
inhibit timer starts.
G
Refrigerant pump and cooler pumps de-energized (120 sec-
onds after F).Condenser pump and tower fan control may
continue to operate if condenser pressure is high. Cooler
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
REF PUMP
COMPRESSOR,
COMPRESSOR ONTIME,
SERVICE ONTIME
15-MINUTE
START-TO-START
2-MINUTE
STOP-TO-STA R T
PRESTART CHECK CONDITION* STATE NUMBER
†
STARTS IN 12 HOURS 8 (not counting recycle restarts or auto restarts after power failure) Alert – 100
COND PRESSURE COND PRESS OVERRIDE – 20 psi Alert – 102
#RECYCLE RESTARTS LAST 4 HOURS > 5 Alert – 103
COMP BEARING TEMP >= COMP BEARING ALERT– 10°F (5.6°C) Alarm – 230
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 <Evap trip point** + EVAP OVERRIDE DELTA T Alarm – 233
EVAP REFRIG LIQUID TEMP <Evap trip point** + EVAP OVERRIDE DELTA T Alarm – 233
AVERAGE LINE VOLTAGE UNDERVOLTAGE THRESHOLD
††
Alarm – 234
AVERAGE LINE VOLTAGE OVERVOLTAGE THRESHOLD
††
Alarm – 235
CHECK FOR GUIDE VANE 1 CALIBRATION Alarm – 236
CHECK FOR GUIDE VANE 2 CALIBRATION Alarm – 238
PUMP
REFRIGERANT FILTER
PURGE DRAIN
COOLER
SIGHT GLASSSTRAINER
STRAINER
PUMPOUT
DRAIN
BEARING FILTER
BEARING
SUPPLY
HS FLOAT CHAMBER
2-WAY
ACTUATED VALVE
3-WAY
ACTUATED
VALVE
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