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

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SECTION 9 - MAINTENANCE 132 PROCEDURE WEEKLY QUARTERLY Check Oil Level in Oil Separator Sight Glass. Check <strong>Liquid</strong> Line Sight Glass/ Moisture Indicator. Check refrigerant level in the Evaporator Sight Glass while running full load for 10 to 15 minutes. Record System Operating Temperatures & Pressures. Check Condenser Coils for dirt / debris and clean as necessary. Check Programmable Operating Setpoints and Safety Cutouts. Assure they are correct for the application. Check Compressor and Evaporator Heater operation. Check for dirt in the Panel. Check Door Gasket sealing integrity. X X X X SEMI- ANNUALLY **Leak check the Chiller. X **Sample Compressor Oil, check for Acid, and replace if necessary. **Disconnect Power Source and Lock Out. Check tightness of Power Wiring connections. Check Glycol concentration on Low Temp. or other applications where freezing may be a problem. MAINTENANCE REQUIREMENTS FOR <strong>YVAA</strong> CHILLERS X X X X ANNUALLY EVERY 5 YEARS VSD Glycol Change. X X X X FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 EVERY * HOURS * Reserved for customer use for any special site requirements. ** This procedure must be performed at the specific time by an industry certified technician who has been trained and qualified to work on this type of equipment. A record of this procedure be successfully carried out should be maintained on file by the equipment owner should proof of adequate maintenance be required at a later date for warranty purposes. JOHNSON CONTROLS
FORM 201.28-NM1.1 ISSUE DATE: 8/29/2012 TABLE 13 - TROUBLESHOOTING GUIDE PROBLEM POSSIBLE CAUSE ACTION NO DISPLAY ON CON- TROL PANEL. UNIT WILL NOT RUN. LINE FUSE BLOWS. CHILLER FAULT: LOW AMBIENT TEMPERATURE CHILLER FAULT: HIGH AMBIENT TEMPERATURE CHILLER FAULT: LOW LEAVING CHILLED LIQUID SYSTEM FAULT: CONTROL VOLTAGE SYSTEM FAULT: HIGH OIL TEMPERATURE Supply to the Panel is missing. Line Fuse is blown. Check Fuses. SECTION 9 - MAINTENANCE High Voltage to the Chiller is missing. Check 1FU, 2FU, 4FU, 5FU 17FU, or 19FU. Check 2T or 10T Transformer. Chiller Control Board is defective. Replace Chiller Control Board. Display Board defective. Replace Display Board. SCR Diode Module is defective. Check SCR/Diode Module. IBGT Module is defective. Check IBGT Module. VSD Logic Board is defective. Replace VSD Logic Board. SCR Trigger Board is defective. Replace SCR Trigger Board. Ambient temperature is lower than the programmed operating limit. Ambient Sensor is defective. Ambient Temperature is above the maximum operating limit. Ambient Sensor is defective. Leaving chilled liquid temperature drops faster than the unit can unload. Chilled Water Sensor is defective. System Fuse is blown. Oil Temperature Sensor is defective. Condenser Fans NOT operating or running backwards. Check the programmed cutout and determine if it is programmed correctly. Check the panel against the thermometer reading of ambient temperature. Check outside air temperature. Check the Panel Display against Thermometer reading of Ambient Temperature at the sensor. Check for restricted flow. Check for rapid flow changes. Water loop is too small. Flow is below minimum for chiller. Check Sensor against Temp. Gauge in water line. Check Sensor for intermittent operation. Check Wiring for shorts or opens. Check respective system Fuse 20FU or 21FU. Check Sensor with infrared to determine if reading is reasonable. Check Fans. Coils dirty. Check and clean Coils. NOTE: Always remove power to the chiller and assure the DC Bus voltage has bled off. JOHNSON CONTROLS 133 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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