Trane TRG-TRC011-EN manual Maintenance Considerations

Page 53

period four

Maintenance Considerations

notes

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◆Check level of liquid refrigerant in purge condensing unit

◆Check vacuum pump oil

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◆Inspect purge condensing coil and clean as necessary

◆Change vacuum pump oil as needed

Figure 57

Most purges are fully automatic and generally require less maintenance than previous-generation manually operated purges. Purge-related maintenance procedures are simple.

νWeekly: With the purge unit operating, check the purge tank condensing activity by observing the liquid refrigerant level in the sump sight glass and checking the vacuum pump oil.

νSemiannually: Inspect the air-cooled condensing-unit coil and clean as needed. A fouled coil will reduce purge efficiency and capacity. Change the vacuum pump oil as needed.

As mentioned in Period Three, the purge can be used to indicate an air leak or depletion of the corrosion inhibitor. Leaks can be detected early by comparing pump-out activity over the last 24 hours to the 30-day average. The hermetic integrity of the absorption chiller is critical to its operation. Any leaks should be addressed immediately.

48	TRG-TRC011-EN

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Contents Air Conditioning Clinic Absorption Water Chillers Absorption Water Chillers Preface Contents TRG-TRC004-EN Introduction TRG-TRC011-EN Period one Absorption Refrigeration CyclePeriod one Reject heat Heat energy Absorption System Fluids High affinity for water refrigerant Components of the Absorption Cycle Conditions Steam or Hot waterrefrigerant vapor Generator Condenser Refrigerant then flows into the evaporator pan Absorber spray pump Solution Heat Exchanger Dilute Generator pump Equilibrium Chart Heat Solution temperature Period two Absorption Chiller TypesSingle-Effect Chiller Absorber Evaporator spray pump Spray pump Generator pump Double-Effect Chiller Vapor Low Temperature condenser Cooling Generator Water Evaporator Absorber Low-temperature generator pump Generator pump Absorption Chiller Types Direct-Fired Chiller Evaporator High-temperature high-temperature Generatorgenerator pump Chiller/Heater Absorption Chiller Types Changeover Absorption Chiller Types Period three Capacity ControlPeriod three Energy valve Generator Crystallization 10C 37.8C Capacity Control Capacity Control Capacity Control Heat exchanger bypass Evaporator pan Purge System Isolation valve Period four Maintenance ConsiderationsPeriod four Maintenance Considerations Test run with alternate fuel, if dual-fuel burner Maintenance Considerations Maintenance Considerations Corrosion inhibitor and performance additive recommendations Period five Application ConsiderationsCooling-Water Temperature Limitations Combination Chiller Plants 58F Special Considerations for Direct-Fired Chillers Application Considerations Equipment Rating Standards Period six ReviewPeriod six Review Review Review Questions for Period QuizQuiz TRG-TRC011-EN Answers Glossary Glossary Glossary Trane Company