| Document type | Installation Guide |
|---|---|
| Document number | 150.72-ICOM8 |
| Equipment | YLAA Scroll Chiller |
| Brand | YORK |
| File size | 9.3 MB |
Fault codes in this document
YorkTalk 2 Fault Codes (may not be available on all models)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 0 | No Fault Code | 117 | ||
| 1 | VAC Undervoltage | 117 | ||
| 2 | Low Ambient Temperature | 117 | ||
| 3 | High Ambient Temperature | 117 | ||
| 4 | Low Leaving Chilled Liquid Temperature | 117 | ||
| 5 | High Discharge Pressure | 117 | ||
| 6 | High Differential Oil Pressure | 117 | ||
| 7 | Low Suction Pressure | 117 | ||
| 8 | High Motor Current | 117 | ||
| 9 | LLSV Not On | 117 | ||
| 10 | Low Battery Warning | 117 | ||
| 11 | High Oil Temperature | 117 | ||
| 12 | High Discharge Temperature | 117 | ||
| 13 | Improper Phase Rotation | 117 | ||
| 14 | Low Motor Current / MP / HPCO | 117 | ||
| 15 | Motor Current Inpomabalanced | 117 | ||
| 16 | Low Differntail Oil Pressure | 117 | ||
| 17 | Grpound Fault | 117 | ||
| 18 | MP / HPCO Fault | 117 | ||
| 19 | Low Evaporator Temperature | 117 | ||
| 20 | Incorrect Refrigernat Programmed | 117 | ||
| 21 | Power Failure, Manual Reset Required | 117 | ||
| 22 | Unit Motor Current | 117 | ||
| 23 | Low Superheat | 117 | ||
| 24 | Sensor Fault | 117 | ||
| 25 | Discharge Inhibit | 117 | ||
| 26 | MP/HPCO Inhibit | 117 | ||
| 27 | Pump Trip | 117 | ||
| 28 | Pump Fail Make Flow | 117 | ||
| 29 | High Ambient Temperature | 117 |
Troubleshooting
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| NO DISPLAY ON PANEL. UNIT WILL NOT OPERATE | 1. No 220VAC to 24VAC Transformer. 2. No 24VAC to Microboard. 3. Control Transformer defective, no 24VAC output. 4. Short in wire to temp. sensors or pressure transducers. 5. Defective IPU II & I/O Board or the Display Board. | 1a. Check wiring and fuse 1FU. 1b. Check wiring emergency stop contacts 5 to L of XTBC2 Terminal Block. 1c. Replace Control Transformer. 2. Check wiring Control Transformer to Microboard. 3. Replace Control Transformer. 4. Unplug connections at IPU II & I/O Board to isolate. 5. Replace IPU II & I/O Board or the Display Board. Contact Johnson Controls Service before replacing circuit Boards! | 138 | |
| FLOW SWITCH/REM STOP NO RUN PERMISSIVE | 1. No chilled liquid flow. 2. Flow switch improperly installed. 3. Defective flow switch. 4. Remote cycling device open. | 1. Check chilled liquid flow. 2. Check that the flow switch is installed according to manufacturer’s instructions. 3. Replace flow switch. 4. Check cycling devices connected to terminals 13 and 14 of the XTBC1 Terminal Block. | 138 | |
| LOW SUCTION PRESSURE FAULT | 1. Improper suction pressure cutouts adjustments. 2. Low refrigerant charge. 3. Fouled filter dryer. 4. TXV defective. 5. Reduced flow of chilled liquid through the cooler. 6. Defective suction pressure transducer/low pressure switch or wiring. 7. LLSV defective | 1. Adjust per recommended settings. 2. Repair leak if necessary and add refrigerant. 3. Change dryer/core. 4. Replace TXV. 5. Check GPM (See Operational Limitations on page 35). Check operation of pump, clean pump strainer, purge chilled liquid system of air. 6. Replace transducer/low pressure switch or faulty switch or wiring. Refer to SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. 7. Replace LLSV | 138 | |
| HIGH DISCHARGE PRESSURE FAULT | 1. Condenser fans not operating or operating backwards. 2. Too much refrigerant. 3. Air in refrigerant system. 4. Defective discharge pressure transducer. | 1. Check fan motor, and contactors. Assure fan blows air upward. 2. Remove refrigerant. 3. Evacuate and recharge system. 4. Replace discharge pressure transducer. Refer to SECTION 9 – SERVICE AND TROUBLESHOOTING for pressure/voltage formula. | 138 | |
| LOW LIQUID TEMP FAULT | 1. Improperly adjusted leaving chilled liquid temp. cutout (glycol only). 2. Micro panel setpoint/range values improperly programmed. 3. Chilled liquid flow too low. 4. Defective LWT or RWT sensor (assure the sensor is properly installed in the bottom of the well with a generous amount of heat conductive compound). | 1. Re-program the leaving chilled liquid temp. cutout. 2. Re-adjust setpoint/range. 3. Increase chilled liquid flow. Refer to Operational Limitations on page 35). 4. Compare sensor against a known good Temperature sensing device. Refer to Table 26 on page 134 | 139 | |
| MP / HPCO FAULT | 1. Compressor internal motor protector (MP) open. 2. External overload tripped. 3. HPCO switch open. 4. Defective HPCO switch. 5. Defective CR relay. | 1. Verify refrigerant charge is not low. Verify superheat setting of 5.6°C to 8.3°C (10°F to 15°F). Verify correct compressor rotation. Verify compressor is not overloaded. 2. Determine cause and reset. 3. See High Press. Disch. Fault. 4. Replace HPCO switch. 5. Replace relay. | 139 | |
| COMPRESSOR(S) WON’T START | 1. Demand not great enough. 2. Defective water temperature sensor. 3. Contactor/Overload failure. 4. Compressor failure. | 1. No problem. Consult Installation Manual to aid in understanding compressor operation and capacity control. 2. Compare the display with a thermometer. Should be within plus or minus 2 degrees. Refer to Table 26 on page 134 for RWT/LWT temp./voltage table. 3. Replace defective part. 4. Diagnose cause of failure and replace. | 139 | |
| LACK OF COOLING EFFECT | 1. Fouled evaporator surface. Low suction pressure will be observed. 2. Improper flow through the evaporator. 3. Low refrigerant charge. Low suction pressure will be observed. | 1. Contact the local Johnson Controls service representative. 2. Reduce flow to within chiller design specs. See Operational Limitations on page 35). 3. Check subcooling and add charge as needed. | 139 |
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