Specifications

108
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 mes-
sages may mean the value is above or below a threshold.
ICVC
FAULT
STATE
PRIMARY MESSAGE SECONDARY MESSAGE PRIMARY CAUSE
ADDITIONAL
CAUSE/REMEDY
240 PROTECTIVE LIMIT
LOW DISCHARGE SUPERHEAT 240->Check for Oil in Refrigerant or
Overcharge of Refrigerant.
Check ACTUAL SUPERHEAT and SUPERHEAT
REQUIRED in OVERRIDE screen. Check the oil
level in the compressor oil sump. Excessive oil in
the evaporator may cause foaming and cause car-
ryover into the compressor. The refrigerant level in
the evaporator may be too low resulting in ineffec-
tive oil reclaim at low loads. If the chiller is over-
charged, the oil reclaim may be recovering below
the oil rich mixture on the top of the cooler refriger-
ant level. Excessive refrigerant charge may cause
liquid carry over into compressor. Look for oil and
refrigerant mixture flowing through both oil reclaim
sight glasses. If the refrigerant charge is correct,
inadequate oil reclaim may be caused by plugged
oil reclaim eductors, plugged strainers, or closed
isolation valves on the oil reclaim lines. Confirm
that the oil reclaim eductors are installed correctly.
Check calibration of EVAPORATOR PRESSURE
and CONDENSER PRESSURE transducers.
Check calibration and wiring of COMP DIS-
CHARGE TEMP sensor to CCM J4-17 and J4-18.
241
LOSS OF
COMMUNICATION
WITH STARTER MODULE 241->Loss of Communication With
Starter.
SIO communications between the CCM and ISM
have been lost for an excessive time period. Check
wiring from ISM terminal J7 to CCM terminal J7.
Check power and communication status LEDs on
ISM.
242
LOSS OF
COMMUNICATION
WITH CCM MODULE 242->Loss of Communication With
CCM.
SIO communications between the ICVC and CCM
have been lost for an excessive time period. Check
wiring from CCM terminal J6 to ICVC terminal J7.
Check power and communication status LEDs on
CCM. Confirm that all CCM SW1 switches are in
the "Off" position.
243
POTENTIAL FREEZE-
UP
EVAP PRESS/TEMP TOO LOW 243->Evaporator Refrig Temp [VALUE]
exceeded limit of [LIMIT]*.
Check CALC EVAP SAT TEMP, EVAP REFRIG
LIQUID TEMP, and EVAP REFRIG TRIPPOINT.
Check for proper refrigerant charge.
Check float valve operation. Confirm that optional
refrigerant liquid line isolation valve is open.
Check for proper Chilled Water flow and tempera-
ture. Confirm that condenser 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 sen-
sor. Check for evaporator waterbox division plate
gasket bypass. Check for fouled tubes.
244
POTENTIAL FREEZE-
UP
COND PRESS/TEMP TOO LOW 244->Condenser Refrig Temp [VALUE]
exceeded limit of [LIMIT]*.
Chiller is in Pumpdown/Lockout and the CON-
DENSER REFRIG TEMP is less than the CON-
DENSER FREEZE POINT. Check CONDENSER
FREEZE POINT in SETUP1 screen. Condenser
water too cold or chiller shut down with brine below
32 deg F in cooler so equalization temperature in
chiller approached 32 def F. Check CONDENSER
PRESSURE transducer and wiring to CCM J2-4
through J2-6. Check Condenser Water Tempera-
ture sensors and wiring to CCM J4. Check refriger-
ant charge.
245 PROTECTIVE LIMIT
HIGH VFD SPEED 245->Actual VFD Speed exceeded limit
of Target VFD Speed + 10%.
ACTUAL VFD SPEED in COMPRESS screen has
exceeded TARGET VFD SPEED by more than
10%. Check calibration of 0 - 5 volt VFD speed
feedback signal to ISM J6-1 and J6-2.
246 PROTECTIVE LIMIT
INVALID DIFFUSER CONFIG 246->Diffuser Control Invalid Configura-
tion: Check SETUP2 Entries
Check 23%, 50%, and 75% Guide Vane and Dif-
fuser Load Point entries in SETUP2 screen
against Diffuser Schedule Settings Label on the
back of the Control Panel cover.
247 PROTECTIVE LIMIT
DIFFUSER POSITION FAULT 247->Diffuser Position Fault: Check
Guide Vane and Diffuser Actuators
Confirm that DIFFUSER OPTION in SETUP 2
screen has not been Enabled if compressor does
not have a split ring diffuser. May indicate rotating
stall condition. Check DIFFUSER CONTROL
Schedule in SETUP2 screen. Check DIFFUSER
PRESSURE rotating stall transducer wiring to
CCM J3-10, J3-11 and J3-12. Confirm that 4.3
kilohm load resistor is installed between CCM J3-7
and J3-8. Confirm that DIFFUSER PRESSURE
transducer is secured to the threaded fitting on the
compressor housing. Check for proper operation
of diffuser and inlet guide vane actuators including
inlet guide vane calibration. Check wiring between
CCM J4-9 and J4-10 and the guide vane position
feedback potentiometer. Check diffuser and guide
vane actuator couplings for rotational slip. Check
for electrical noise in CCM Diffuser Pressure wir-
ing. Install noise suppressor in parallel with Motor
Temperature sensor on CCM J4-23 and J4-24. Do
not continue to operate compressor except for
diagnostic purposes.