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