Specifications

106
Table 17 — ICVC Primary and Secondary Messages and
Custom Alarm/Alert Messages with Troubleshooting Guides (cont)
I. CHILLER PROTECTIVE LIMIT FAULTS (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. "Exceeded Limit" in Alarm or Alert messages may mean the value is above or
below a threshold
.
ICVC
FAULT
STATE
PRIMARY MESSAGE SECONDARY MESSAGE PRIMARY CAUSE
ADDITIONAL
CAUSE/REMEDY
227 PROTECTIVE LIMIT
OIL PRESS SENSOR FAULT 227->Oil Pump Delta P [VALUE]
exceeded limit of [LIMIT]*
OIL PUMP DELTA P > 4 PSI when oil pump is off.
Select OIL PUMP DELTA P in the COMPRESS
screen to calibrate pressure transducers. Check
Oil Sump Pressure and Oil Pump Discharge Pres-
sure transducer wiring leading to CCM J3-1
through J3-6. Confirm that 5.0 V reference voltage
is available between CCM J3-1 and J3-2 and CCM
J3-4 and J3-6. Check power supply to oil pump.
Check oil pump operation and isolation valves.
228 PROTECTIVE LIMIT
LOW OIL PRESSURE 228->Oil Pump Delta P [VALUE]
exceeded limit of [LIMIT]*
Check oil level sight glasses on compressor base.
Check for partially closed oil filter and oil reclaim
isolation valves. Select OIL PUMP DELTA P in the
COMPRESS screen to calibrate pressure trans-
ducers. Check Oil Sump Pressure and Oil Pump
Discharge Pressure transducer wiring leading to
CCM J3-1 through J3-6. Confirm that 5.0 V refer-
ence voltage is available between CCM J3-1 and
J3-2 and CCM J3-4 and J3-6. Check power supply
to oil pump fuses, 2C contactor, and oil pump.
Check oil pump operation in CONTROLS TEST
screen. Check oil filter. Check for foaming oil at
start-up. Check oil pressure regulator valve.
229 PROTECTIVE LIMIT
LOW CHILLED WATER FLOW 229->Low Chilled Water Flow; Check
Delta P Config and Calibration
Perform Chilled Water pump test in CONTROLS
TEST screen. Check EVAP REFRIG LIQUID
TEMP and LEAVING CHILLED WATER tempera-
ture sensor accuracy and wiring to CCM. Check
chilled water valves, pumps, and strainers. Check
EVAP REFRIG TRIPPOINT, EVAP APPROACH
ALERT, EVAP FLOW DELTA P CUTOUT, and
WATER FLOW VERIFY TIME settings. Check load
resistors, optional water flow switches or water
flow delta P transducer calibration and wiring to
CCM J3-13 through J3-18. Check for 5.0 V refer-
ence voltage between CCM J3-13 and J3-15 and
J3-16 and J3-18. Activate Pumpdown Mode in
CONTROLS TEST screen before removing refrig-
erant charge.
230 PROTECTIVE LIMIT
LOW CONDENSER WATER
FLOW
230->Low Condenser Water Flow;
Check Delta P Config and Calibration
Perform Condenser Water pump test in CON-
TROLS TEST screen. Check CONDENSER
PRESSURE transducer and LEAVING CON-
DENSER WATER temperature sensor accuracy
and wiring.
Check condenser water valves and strainers.
Check COND PRESS OVERRIDE, COND
APPROACH ALERT, COND FLOW DELTA P CUT-
OUT, and WATER FLOW VERIFY TIME settings.
Check for CONDENSER PRESSURE > 165 PSIG.
Check load resistors, optional water flow switches
or water flow delta P transducer calibration and
wiring to CCM terminals J3-19 to J3-24. Check for
5.0 V reference voltage between CCM J3-19 and
J3-21 and J3-22 and J3-24.
231 PROTECTIVE LIMIT
HIGH DISCHARGE TEMP 231->Comp Discharge Temp [VALUE]
exceeded Limit of [LIMIT]*
Check for closed compressor discharge isolation
valve. Check if chiller was operating in surge con-
ditions. Check COMP DISCHARGE TEMP sen-
sor resistance or voltage drop.
Check for proper wiring to CCM J4-17 and J4-18.
Check for proper condenser flow and temperature.
Check for proper inlet guide vane and optional dif-
fuser actuator operation. Check for COMP DIS-
CHARGE TEMP > 220 deg F. Check for fouled
tubes, plugged water strainers, or noncondensi-
bles in the condenser.
232 PROTECTIVE LIMIT
LOW REFRIGERANT TEMP 232->Evaporator Refrig Temp [VALUE]
exceeded limit of [LIMIT]*.
Check for proper refrigerant charge.
Check float valve operation. Check for closed con-
denser liquid line isolation valve. If problem occurs
at high load, check for low condenser pressure
which causes inadequate refrigerant flow through
condenser flasc orifices. Check for proper chilled
water flow and temperature. Confirm that con-
denser water enters bottom row of condenser
tubes first, reversed condenser water flow may
cause refrigerant to stack in the condenser. Check
EVAPORATOR PRESSURE transducer and EVAP
REFRIG LIQUID TEMP and LEAVING CHILLED
WATER sensors. Check for division plate gasket
bypass. Check for fouled tubes. Check pressure
transducer and temperature sensor wiring to the
CCM.