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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| ||||
220 | PROTECTIVE LIMIT | GROUND FAULT | 220→Ground Fault Trip; | Check for condensation on motor terminals. | |
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| Check Motor and Current | Check motor power leads for phase to phase or | |
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| Sensors. | phase to ground shorts. Disconnect motor from | |
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| VFD and megger motor. | |
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|
| Call Carrier Service. | |
221 | PROTECTIVE LIMIT | UNUSED | 221→UNUSED |
| |
222 | PROTECTIVE LIMIT | LINE FREQUENCY TRIP | 222→Line Frequency — | If operating from a generator, check generator | |
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|
| [VALUE] exceeded limit of | size and speed. | |
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|
| [LIMIT]; Check Power Supply. | Check utility power supply. | |
223 | LOSS OF | WITH VFD GATEWAY | 223→Loss of SIO Comm with | Check VFD communication wiring and | |
| COMMUNICATION | MODULE | VFD Gateway: Check VFG | connectors on VFD Gateway and DPI board. | |
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|
| Module and Power. | Check for compatibility between ICVC and | |
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|
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| Gateway software. | |
224 | PROTECTIVE LIMIT | VFD COMMUNICATIONS | 224→Loss of DPI Comm with | Check VFD communication wiring and | |
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| FAULT | VFD Gateway: Check VFG to | connectors. | |
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| VFD Comm. | Check status lights on DPI Communications | |
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|
|
| Interface Board. | |
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|
|
| Call Carrier Service. | |
225 | PROTECTIVE LIMIT | MOTOR CURRENT | 225→Motor Current Imbal- | Check Motor Current % Imbalance in | |
|
| IMBALANCE | ance: Check VFD Fault | VFD_CONF screen. | |
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|
| History for Values. |
| |
226 | PROTECTIVE LIMIT | LINE PHASE REVERSAL | 226→Line Phase Reversal: | Reverse connections of any two line conductors | |
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|
| Check Line Phases. | to circuit breaker. | |
227 | PROTECTIVE LIMIT | OIL PRESS SENSOR | 227→Oil Pressure Delta P | Check transducer wiring and accuracy. | |
|
| FAULT | [VALUE] (Pump Off): Check | Check power supply to pump. | |
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| Pump/Transducers. | Check pump operation. | |
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| Check transducer calibration. | |
228 | PROTECTIVE LIMIT | LOW OIL PRESSURE | 228→Low Operating Oil | Check transducer wiring and accuracy. | |
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| Pressure [VALUE]: Check Oil | Check power supply to pump. | |
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| Pump and Filter. | Check pump operation. | |
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| Check oil level. | |
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| Check for partially closed service valves. | |
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|
| Check oil filters. | |
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|
| Check for foaming oil at | |
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|
| Check transducer calibration. | |
229 | PROTECTIVE LIMIT | LOW CHILLED WATER | 229→Low Chilled Water Flow; | Perform pump control test. | |
|
| FLOW | Check Switch/Delta P Config | Check optional transducer calibration and | |
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| & Calibration. | wiring. | |
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| Check Evaporator Refrigerant Temperature | |
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|
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| sensor. | |
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| Check chilled water valves. | |
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|
| Check for evaporator saturation temperature | |
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| < 34 F if not in Pumpdown Lockout mode. Place | |
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| unit in Pumpdown mode before removing | |
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| charge. | |
230 | PROTECTIVE LIMIT | LOW CONDENSER | 230→Low Condenser Water | Perform pump control test. | |
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| WATER FLOW | Flow; Check Switch/Delta P | Check optional transducer calibration and | |
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|
| Config & Calibration. | wiring. | |
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|
|
| Check condenser water valves. | |
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|
| Check for COND PRESS OVERRIDE + 5 psig. | |
231 | PROTECTIVE LIMIT | HIGH DISCHARGE TEMP | 231→Comp Discharge Temp | Check for closed compressor discharge isola- | |
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|
| [VALUE] Exceeded Limit of | tion valve. | |
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|
| [LIMIT]*. | Check if chiller was operating in surge. | |
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| Check sensor resistance or voltage drop. | |
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| Check for proper wiring. | |
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| Check for proper condenser flow and | |
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| temperature. | |
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| Check compressor discharge isolation valve. | |
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| Check for proper inlet guide vane and optional | |
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| diffuser actuator operation. | |
232 | PROTECTIVE LIMIT | LOW REFRIGERANT | 232→Evaporator Refrig Temp | Check for proper refrigerant charge. | |
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| TEMP | [VALUE] exceeded limit of | Check float valve operation. | |
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|
| [LIMIT]*. | Check for closed condenser liquid line isolation | |
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| valve. If problem occurs at high load, check for | |
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| low condenser pressure which causes inade- | |
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| quate flasc orifice differential pressure. | |
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| Check for proper water 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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|
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| Check for division plate gasket bypass. | |
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| Check for fouled tubes. |
*[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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