Specifications

88
Table 15 — ICVC Primary and Secondary Messages and
Custom Alarm/Alert Messages with Troubleshooting Guides (cont)
*[LIMIT] is shown on the ICVC as the temperature, pressure, voltage, etc., set point predefined or selected by the operator as an
override, alert, or alarm condition. [VALUE] is the actual pressure, temperature, voltage, etc., at which the control tripped.
I. CHILLER PROTECTIVE LIMIT FAULTS (cont)
STATE
PRIMARY
MESSAGE
SECONDARY
MESSAGE
ALARM MESSAGE
PRIMARY CAUSE
ADDITIONAL
CAUSE/REMEDY
228 PROTECTIVE LIMIT
LOW OIL
PRESSURE
228->Low Operating Oil Pressure
[VALUE]: Check Oil Pump
and Filter
Check oil level in Oil Sump sight glasses.
Check OIL SUMP PRESSURE and OIL
PRESSURE LEAVING FILTER transducer
wiring and voltage drop.
See Table 5.
Check power supply to pump and pump operation.
Look for oil flow through vaporizer drain
sight glass when chiller is running.
Check for partially closed isolation valves.
Check oil filter.
Check for foaming oil at start-up in oil sump.
Check OIL PRESSURE DELTA P transducer
calibration in COMPRESS screen.
Check vaporizer and oil sump heaters and
contactors.
229 PROTECTIVE LIMIT
LOW CHILLED
LIQUID FLOW
229->Low Chilled Liquid Flow;
Check Switch/Delta P
Config & Calibration
Perform Pump Control Test in CONTROLS
TEST screen.
Check EVAP REFRIG LIQUID TEMP and
LEAVING CHILLER LIQUID sensor
accuracy and wiring.
See Table 5.
Check chilled liquid valves, pumps, and strainers.
Check EVAP REFRIG TRIPPOINT, EVAP
APPROACH ALERT, and EVAP FLOW DELTA P
CUTOUT, and LIQUID FLOW VERIFY TIME
settings.
Check optional liquid flow switches or liquid
delta P transducer calibration.
230 PROTECTIVE LIMIT
LOW CONDENSER
LIQUID FLOW
230->Low Condenser Liquid
Flow; Check Switch/Delta P
Config & Calibration
Perform Pump Control Test in CONTROLS
TEST screen.
See Table 5.
Check CONDENSER PRESSURE and LEAVING
COND LIQUID sensors accuracy and wiring.
Check condenser liquid valves, pumps,
and strainers.
Check COND APPROACH ALERT, COND
PRESS OVERRIDE, LIQUID FLOW VERIFY TIME,
and COND FLOW DELTA P CUTOUT settings.
Check optional liquid flow switches or liquid
delta P transducer calibration.
231 PROTECTIVE LIMIT
HIGH DISCHARGE
TEMP
231->Comp Discharge Temp
[VALUE] Exceeded Limit of
[LIMIT]*
Check discharge isolation valve position.
See Table 5.
Check COMP DISCHARGE TEMP sensor
resistance or voltage drop.
Check for proper COMP DISCHARGE TEMP
sensor wiring.
Check for proper condenser flow and temperature.
Check for fouled tubes, plugged liquid strainers
or noncondensables in the system.
232 PROTECTIVE LIMIT
LOW REFRIGERANT
TEMP
232->Evaporator Refrig Temp
[VALUE] exceeded limit of
[LIMIT]*.
Alarm declared when chiller is running,
see Table 5.
Check Cooler Refrig Liquid Line Isolation
Valve Position.
Check for proper refrigerant charge.
Check Condenser Float Valve operation,
check if CHILLED LIQUID APPROACH
decreases when CONDENSER PRESSURE
increases.
Check EVAP APPROACH ALERT setting.
Check for proper fluid flow and temperature
against chiller design conditions.
233 PROTECTIVE LIMIT
HIGH MOTOR
TEMPERATURE
233->Comp Motor Winding Temp
VALUE] exceeded limit of
[LIMIT]*.
Check COMP MOTOR WINDING TEMP
sensor wiring and accuracy.
See Table 5.
Check motor cooling line for proper operation,
restrictions, and isolation valve position.
Check motor cooling filter/drier and look for
refrigerant flow through motor cooling sight
glass.
Check for excessive starts within a
short time span.
The high motor temperature switch in the windings
or the motor temperature sensor circuit is open if
COMP MOTOR WINDING TEMP = 245 F(118 C).