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My compressor runs but the chilled water is not cooling and the discharge pressure is low – why?

April 26, 2017chilled compressor cooling Discharge low pressure water

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My compressor runs but the chilled water is not cooling and the discharge pressure is low – why?

1 Answer

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Inability to control at temperature with a low discharge pressure is a sign of a low refrigerant charge. Typically the problem is that the condenser is working well, but there is not enough refrigerant volume to feed to the evaporator. Thus, the suction pressure can be a little high even though the discharge pressure stays low. The refrigerant is lost due to a leak. Depending on the severity, the TCU can run for quite some time before shutting down. Evenutally, the low pressure switch trips on low suction pressure. The TCU can be restarted after the leak is repaired and the unit recharged.