Johnson Controls YEWS200

Questions and Answers

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Elizabeth KennedyAug 14, 2025
Why is my Johnson Controls Chiller experiencing high discharge pressure?
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  Daniel JacksonAug 14, 2025
  High discharge pressure in your Johnson Controls Chiller can occur due to several reasons. The cooling water temperature might be too high, requiring you to reduce the condenser water inlet temperature by checking the cooling tower and water circulation. The condenser tubes could be dirty or scaled, so cleaning them and checking water conditioning is recommended. Insufficient condenser water flow could also be the cause; increase the quantity of water through the condenser to the proper value. Other potential issues include a faulty compressor discharge valve (check the valve), a faulty discharge pressure sensor (replace the sensor), or air in the condenser (purge the unit).
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Mrs. Lisa AguilarAug 21, 2025
What causes Johnson Controls YEWS200 Chiller to have high discharge temperature?
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  patrickmccormickAug 21, 2025
  High discharge temperature in your Johnson Controls Chiller can be attributed to a few key factors. The cooling water temperature may be too high; in this case, reduce the condenser water inlet temperature by checking the cooling tower and water circulation. Another cause could be dirty or scaled condenser tubes, which would need to be cleaned. Finally, insufficient load for system capacity may be the issue, so increase the compressor minimum operation current set.
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Daniel BrownAug 25, 2025
What to do if Johnson Controls YEWS200 motor over current?
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  Meghan GonzalezAug 26, 2025
  If your Johnson Controls Chiller's motor is experiencing over current, it could be due to the compressor load increasing too rapidly. Try adjusting the compressor loading time setting. Alternatively, the “CUR.OFFSET” value might be incorrect; adjust the current offset to the proper value.
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Clifford MorrisonAug 28, 2025
Why does Johnson Controls YEWS200 show oil level switch trip?
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  Patricia MartinezAug 28, 2025
  An oil level switch trip in your Johnson Controls Chiller can occur for several reasons. The system might be overcharged with refrigerant; recover refrigerant to achieve the correct discharge superheat and subcooling. A faulty oil level switch could be the culprit, requiring replacement. Similarly, a faulty oil heater should be replaced. If the oil filter (outside the compressor) is clogged, clean it. The compressor not starting from minimum load can also cause this issue; check the compressor slide valve and slide valve solenoid valve, and set the compressor unloading time to the proper value. Finally, insufficient load for system capacity may be the cause, so increase the compressor minimum operation current set.
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Sarah WelchAug 31, 2025
What causes insufficient oil supply pressure in Johnson Controls YEWS200 Chiller?
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  William WrightAug 31, 2025
  Insufficient oil supply pressure in your Johnson Controls Chiller can be caused by a cooling water temperature that is too low; increase the condenser water temperature. Alternatively, a faulty oil pressure or evaporation pressure sensor could be the issue, so change the pressure sensor.
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francisortizSep 3, 2025
What causes low chilled water temperature in Johnson Controls Chiller?
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  Tammy KimSep 3, 2025
  Low chilled water temperature in your Johnson Controls Chiller can occur if the slide valve fails to unload; check the compressor slide valve and slide valve solenoid valve, and set the compressor unloading time to the correct value. Also, the “LOW LELT” value might be incorrect; adjust the water temperature set value.
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Kelly RobertsonSep 7, 2025
What to do if the difference of discharge pressure and oil pressure is too high in Johnson Controls YEWS200?
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  Mercedes GrossSep 7, 2025
  If the difference between discharge pressure and oil pressure is too high in your Johnson Controls Chiller, it could be due to a clogged oil filter (inside the compressor); change the oil filter. Another potential cause is a faulty discharge pressure or oil pressure sensor, so change the pressure sensor.
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Amy SalasSep 10, 2025
How to fix low discharge superheat in Johnson Controls Chiller?
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  Sarah WeissSep 10, 2025
  Low discharge superheat in your Johnson Controls Chiller can be caused by a few things. It could be that the system is overcharged with refrigerant, in which case you should adjust the charge. Another cause might be refrigerant saturated with oil; perform oil recovery and check oil levels. Finally, the system might be overcharged with oil, so adjust the oil charge.
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Mikayla NelsonNov 17, 2025
What to do if Johnson Controls Chiller shows low suction pressure?
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  Derrick McgeeNov 17, 2025
  Low suction pressure in your Johnson Controls Chiller can stem from several issues. It could be due to a faulty pressure sensor, which would require you to change the pressure sensor. A faulty chilled water temperature sensor could also be the problem, so replace it. Check for dirty or scaled evaporator tubes and clean them, ensuring proper water conditioning. Insufficient evaporator water flow can also cause this; increase the water flow through the evaporator to the correct level. Additionally, verify that the “LOW LELT” or "LEP SHUN DOWN" settings are correct and reset them if needed. Other potential causes include the compressor not starting from minimum load or a slide valve malfunction, both requiring inspection of the compressor slide valve and slide valve solenoid valve. A slide va...