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1、Service Alert RTHD and RTAC Control Operation Setup and Troubleshooting for RTAC and RTHD Units with Tracer CH530 Controls The purpose of this bulletin is to provide control operation and general troubleshooting information on the RTAC Air Cooled Chillers and RTHD Water Cooled Chillers with the CH53
2、0 controls It is recommended that the service technician be familiar with the CH530 operation prior to servicing the microprocessor This bulletin is intended to serve as a supplement to the RTAC and RTHD IOMs the installation operation and maintenance manuel Subjects covered in this bulletin are int
3、ended to provide more comprehensive information for the RTAC and RTHD units Diagnostic Troubleshooting Repair November 2005RLC SVD05A EN Warnings and Cautions 2005 American Standard Inc All rights reservedRLC SVD05A EN Important Read This First This manual is intended for experienced service personn
4、el familiar with the proper use of electrical diagnostic instruments and all personal safety procedures when working on live electrical circuits This Manual is not intended for individuals who have not been properly trained in handling live electrical circuits Important Environmental Concerns Scient
5、ific research has shown that certain man made chemicals can affect the earth s naturally occurring stratospheric ozone layer when released to the atmosphere In particular several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine Fluorine and Carbon CF
6、Cs and those containing Hydrogen Chlorine Fluorine and Carbon HCFCs Not all refrigerants containing these compounds have the same potential impact to the environment Trane advocates the responsible handling of all refrigerants including industry replacements for CFCs such as HCFCs and HFCs Responsib
7、le Refrigerant Practices Trane believes that responsible refrigerant practices are important to the environment our customers and the air conditioning industry All technicians who handle refrigerants must be certified The Federal Clean Air Act Section 608 sets forth the requirements for handling rec
8、laiming recovering and recycling of certain refrigerants and the equipment that is used in these service procedures In addition some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants Know the applicable laws and follow t
9、hem WARNING Contains Refrigerant System contains oil and refrigerant under high pressure Recover refrigerant to relieve pressure before opening the system See unit nameplate for refrigerant type Do not use non approved refrigerants refrigerant substitutes or refrigerant additives Failure to follow p
10、roper procedures or the use of non approved refrigerants refrigerant substitutes or refrigerant additives could result in death or serious injury or equipment damage NOTICE Warnings and Cautions appear at appropriate sections throughout this literature Read these carefully WARNING Indicates a potent
11、ially hazardous situation which if not avoided could result in death or serious injury CAUTION Indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices CAUTION Indicates a situation that may result i
12、n equipment or property damage only accidents RLC SVD05A EN3 CH530 Overview 5 Main Processor 5 Starter Module 5 Power Supply Module 5 LLIDs Low Level Intelligent Devices 5 IPC Overview and Troubleshooting 7 Installing a LLID 8 Bus connection crimping procedure 8 Procedure for installing caps 10 Trou
13、bleshooting problems with multiple LLIDS 11 Power Supply 14 Troubleshooting 14 Temperature Sensor 16 Sensor Checkout Procedure 16 Is the sensor bound and communicating 16 Is the sensor reading accurately 17 Pressure Transducers 18 Transducer Checkout Procedure 18 Is the transducer bound and communic
14、ating 18 Is the transducer reading accurately 19 Variable Speed Fan Control RTAC Only 20 Startup and Operation 20 Inverter Fault Input 22 Troubleshooting the Inverter 22 Current Transformers 26 CT and Starter Compressor Current Input Checkout Procedure 27 Over Under Voltage 30 RTAC Chillers 30 Check
15、 out procedure for RTAC 30 Under Over Voltage Transformer Checkout 30 RTHD Chillers 31 Check out procedure for RTHD 31 Potential Transformer 31 Starter Module 33 Starter 34 X Line 34 Y Delta 34 YDelta Starter Sequence 36 Solid State RTHD Only 43 Compressor Capacity RTHD 44 Checkout Procedure for the
16、 Load Unload Outputs 44 Checkout procedure for the Slide Valve and Load Unload Solenoids 45 Load 47 Unload 47 Compressor Capacity RTAC 48 Checkout Procedure for the Female Step Load Outputs 49 Checkout Procedure for the Step Load Solenoids Valve and Piston 49 Checkout Procedure for the Male Load Unload Outputs 49 Checkout procedure for the Slide Valve and Load Unload Solenoids 50 Contents 4RLC SVD05A EN Contents Setup 50 Load 52 Unload 52 Electronic Expansion Valve 54 EXV Checkout Procedure 54 I
