Trane TRG-TRC011-EN manual Period four

Page 52

period four

Maintenance Considerations

notes

condenser inlet and outlet temperatures; and purge operation. Logs are a

valuable tool for determining the onset of system problems.

 

This data may be obtained either manually or in conjunction with a building

 

automation system. The chiller controller should be capable of providing this

 

information quickly and easily. An automated control system is an efficient way

 

to identify operating changes and schedule maintenance before they become a

 

problem.

▲

◆Pump teardown and inspection every 5 to 10 years

◆Controls: no maintenance or calibration required

◆Visually inspect overall unit

◆Inspect safety controls and electrical components

Figure 56

Absorption chillers typically include the following mechanical components: pump(s) to circulate refrigerant and absorbent solution, a purge to remove noncondensables from the chiller, a burner (if directly-fired), and a steam or hot water control valve (if indirectly-fired).

Chiller manufacturers use different types of pumps. Some use a single pump, while others use individual pumps. Some use hermetic pumps that are cooled and lubricated by the pumped solution, and others use pumps with open motors that require an external shaft seal. The pumps should be disassembled and inspected at routine intervals. Be sure to consult the manufacturer for specific recommendations.

With the advent of microprocessor-based controls, the control panel and auxiliary controllers require no recalibration or maintenance. Remotely- mounted electronic sensors send information to the chiller controller, which can be connected to a building automation system to communicate information and allow system-level optimization. These systems can notify the operator with an alarm or diagnostic message when a problem occurs.

As for any mechanical equipment, a daily visual inspection of the chiller is recommended to look for condensation, loosened electrical or control wiring, or signs of corrosion. Special attention should be given to safety controls and electrical components.

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Contents Air Conditioning Clinic Absorption Water Chillers Absorption Water Chillers Preface Contents TRG-TRC004-EN Introduction TRG-TRC011-EN Absorption Refrigeration Cycle Period onePeriod 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 Absorption Chiller Types Period twoSingle-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 Capacity Control Period threePeriod three Energy valve Generator Crystallization 10C 37.8C Capacity Control Capacity Control Capacity Control Heat exchanger bypass Evaporator pan Purge System Isolation valve Maintenance Considerations Period fourPeriod four Maintenance Considerations Test run with alternate fuel, if dual-fuel burner Maintenance Considerations Maintenance Considerations Corrosion inhibitor and performance additive recommendations Application Considerations Period fiveCooling-Water Temperature Limitations Combination Chiller Plants 58F Special Considerations for Direct-Fired Chillers Application Considerations Equipment Rating Standards Review Period sixPeriod six Review Review Review Quiz Questions for PeriodQuiz TRG-TRC011-EN Answers Glossary Glossary Glossary Trane Company
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