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Table 5 — ICVC Alarm Codes (cont)
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.
ICVC FAULT
STATE
PRIMARY
MESSAGE
SECONDARY
MESSAGE
PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
233 PROTECTIVE LIMIT HIGH MOTOR
TEMPERATURE
233Comp Motor Winding
Temp [VALUE] exceeded
limit of [LIMIT]*.
Check motor sensors wiring and accuracy.
Check motor cooling line and spray nozzle for
proper operation, or restrictions.
Check for excessive starts within a short time
span.
234 PROTECTIVE LIMIT HIGH BEARING
TEMPERATURE
234Comp Thrust Brg Temp
[VALUE] exceeded limit of
[LIMIT]*.
Check oil heater for proper operation.
Check for low oil level, partially closed oil supply
valves, or clogged oil filter.
Check oil cooler refrigerant thermal expansion
valves.
Confirm that TXV (thermostatic expansion valve)
bulb is secured in place and insulated.
Check for sensor wiring and accuracy.
This fault can result from extended operation at low
load with low water flow to the evaporator or
condenser.
235 PROTECTIVE LIMIT HIGH CONDENSER
PRESSURE
235Condenser Pressure
[VALUE] exceeded limit of
[LIMIT]*.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check transducer wiring and accuracy.
236 PROTECTIVE LIMIT COMPRESS SURGE/
LOW SPEED
236Compressor Surge:
Check condenser water temp
and flow.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check surge prevention parameters in OPTIONS
screen. Increase VFD Increase Step in SETUP2.
Check VFD Minimum Speed in SETUP2 screen.
237 PROTECTIVE LIMIT SPARE SAFETY
DEVICE
237Spare Safety Device. Spare safety input has tripped or factory installed
jumper is not present on Terminal Block 4 terminals
17 and 20 in the VFD enclosure.
238 PROTECTIVE LIMIT EXCESSIVE COMPR
SURGE
238Compressor Surge:
Check condenser water temp
and flow.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check surge prevention parameters in OPTIONS
screen.
Check cooling tower control settings and perfor-
mance to design/selection temperatures across the
entire operating range of the chiller.
Check cooler approach and water flow.
239 PROTECTIVE LIMIT TRANSDUCER
VOLTAGE FAULT
239Transducer Voltage Ref
[VALUE] exceeded limit of
[LIMIT]*.
Check that CCM transducer voltage reference is
between 4.5 v and 5.5 v.
Check that pressure transducers are not shorted to
ground. This fault is normally declared the first time
an ICVC is powered up if it was downloaded with
software when it was not connected to a CCM.
Call Carrier Service.
240 PROTECTIVE LIMIT LOW DISCHARGE
SUPERHEAT
240Check for Oil in Or
Overcharge of Refrigerant.
Check for oil loss or excessive refrigerant. If oil level
is low, refrigerant charge may be too low resulting in
ineffective oil reclaim. Excessive refrigerant charge
may cause liquid carryover into compressor.
Check calibration of evaporator pressure and con-
denser pressure sensors.
Check calibration of compressor discharge temper-
ature sensor.
241 PROTECTIVE LIMIT RECTIFIER
OVERCURRENT
241Rectifier Overcurrent
Fault: Check VFD Status.
Check for high water temperatures or changes in
water flow rates.
242 LOSS OF
COMMUNICATION
WITH CCM MODULE 242Loss of Communica-
tion With CCM, Check
Comm. Connectors.
Check wiring and control power to CCM.
Confirm that all CCM SW1 switches are in the
“OFF” position.
243 POTENTIAL
FREEZE-UP
EVAP PRESS/TEMP
TOO LOW
243Evaporator Refrig
Temp [VALUE] exceeded
limit of [LIMIT]*.
Check for proper refrigerant charge.
Check float valve operation.
Check for proper fluid flow and temperature.
Confirm that condenser water enters bottom row
of condenser tubes first.
Check Evaporator Refrigerant Temperature
sensor.
Check for division plate gasket bypass.
Check for fouled tubes.
244 POTENTIAL
FREEZE-UP
COND PRESS/TEMP
TOO LOW
244Condenser Refrig
Temp [VALUE] exceeded
limit of [LIMIT]*.
Condenser water too cold or chiller shut down with
brine below 32 F in cooler so equalization tempera-
ture in chiller approached 32 F.
Check condenser pressure transducer.
Check refrigerant charge.