YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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SECTION 9 - MAINTENANCE TABLE 13 - TROUBLESHOOTING GUIDE (CONT'D) 134 PROBLEM POSSIBLE CAUSE ACTION SYSTEM FAULT: HIGH DISCHARGE PRESSURE SYSTEM FAULT: HIGH DISCHARGE TEMPERATURE SYSTEM FAULT: HIGH MOTOR TEMPERATURE SYSTEM FAULT: LOW SUCTION PRESSURE SYSTEM FAULT: DISCHARGE PRESSURE LIMITING Coils dirty. Check and clean coils. Coils are damaged. Comb out fins. Fans NOT operating. Check fan fuses. Check fan rotation. Check fan motor/blade. FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 System is overcharged. Remove charge and check subcooling. Discharge Temperature Sensor is defective. Check Sensor. Condenser Fans NOT operating or are running backwards. Check Fans. Coils dirty. Check and clean Coils. High Superheat. High Motor temperature input from one of the sensors. Measure Superheat with gauges and thermocouple. Determine cause. Low charge. Check subcooling. Refrigerant charge low. Check subcooling. Excess charge in system, High discharge pressure. Check subcooling. High Superheat. Drain/Feed Valves NOT controlling. Isolate cause. Motor Sensor reading incorrectly. Program panel to ignore a single sensor. Economizer Solenoid energized at low speeds. Valve is leaking through. Transducer reads incorrectly. Check transducer against a gauge. Suction Temp. Sensor reads incorrectly. Check sensor against a thermocouple. Low flow. Check flow. Condenser Drain (Flash Tank Feed) Valve NOT operating. Condenser or Drain (Flash Tank Feed) Valve defective. Check Feed and Drain Valve operation. Check superheat. Check Feed and Drain Valve operation. Check superheat. Discharge Transducer is defective. Check transducer against a gauge. Ambient Temp. very high. Normal operation. Fans NOT operating. Check fan operation. Remote or local discharge pressure load limiting is programmed. NOTE: Always remove power to the chiller and assure the DC Bus voltage has bled off. Normal operation. JOHNSON CONTROLS
FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 TABLE 13 - TROUBLESHOOTING GUIDE (CONT'D) PROBLEM POSSIBLE CAUSE ACTION SYSTEM STATUS: MOTOR CURRENT LIMITING VSD FAULT: HIGH BASEPLATE TEMPERATURE VSD FAULT: LOW DC BUS VOLTAGE A high motor current anticipatory control has activated current limiting Coolant level low. Add coolant. SECTION 9 - MAINTENANCE Ambient temperature is high, normal response from controller Remote or panel limiting is in effect, Normal response. Excess charge in system, adjust charge. Condenser coils dirty, Clean condenser. Fans NOT operating. Check fans. Glycol Pump is defective. Replace Glycol Pump. VSD Board is defective Replace VSD Logic Board. IBGT Module is defective. Check defective IGBT Module. SCR / Diode Module is defective. Check SCR / Diode Module. SCR Trigger Board is defective. Check SCR Trigger Board. NOTE: Always remove power to the chiller and assure the DC Bus voltage has bled off. JOHNSON CONTROLS 135 9
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AIR-COOLED SCREW LIQUID CHILLERS IN
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FORM 201.28-NM1.1 ISSUE DATE: 8/29/
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FORM 201.28-NM1.1 SECTION 5 - TECHN
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FORM 201.28-NM1.1 SECTION 5 - TECHN
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YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls

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