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Operation
Maintenance
Duplex CDHF, CDHG
™
Water Cooled CenTraVac
With CH530
X39640670030 CDHF-SVU01C-EN
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Warnings and Cautions death, while cautions are designed to Warnings and Cautions alert personnel to conditions that Notice that warnings and cautions could result in equipment damage. appear at appropriate intervals throughout this manual. Warnings Your personal safety and the proper are provided to alert installing operation of this machine depend contractors to potential hazards that upon the strict observance of these could result in personal injury or precautions. NOTICE: Warnings and Cauti
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Contents Warnings and Cautions 2 General Information 4 Unit Control Panel (UCP) 28 Operator Interface 30 Chilled Water Setpoint 38 Inter Processor Communication (IPC) 51 Control System Components 52 Controls Sequence of Operation 67 Machine Protection and Adaptive Control 72 Unit Startup 89 Unit Shutdown 91 Periodic Maintenance 92 Oil Maintenance 95 Maintenance 97 Forms 104 CDHF-SVU01C-EN 3
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General Information 3. Product Coding Block Unit Nameplate Literature change The CDHF and CDHG models are Applicable to CDHF, CDHG The unit nameplate is located on the defined and built using the product About this manual left side of the unit control panel. definition and selection (PDS) Operation and maintenance The following information is system. This system describes the information for models CDHF, CDHG provided on the unit nameplate. product offerings in terms of a are covered in this man
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General Information th Model Number - An example of a 26 3 = Condenser Tube Bundle Size M = 716 KW typical duplex centrifugal chiller 1 = 2100 nominal ton condenser N = 799 KW model number is: 2 = 2300 nominal ton condenser P = 892 KW 3 = 2500 nominal ton condenser R = 403 KW CDHF2100AA0BC2552613C0B203B0 S = 453 KW 4 = 1610 nominal ton condenser B20KJAC1GW40C111340A010 T = 512 KW 5 = 1760 nominal ton condenser Digit: Description U = 301 KW 6 = 1900 nominal ton condenser st nd ® V = 337 KW th 1
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General Information th 40 C = Control: Condenser V = 1890 Refrigerant Pressure; W = 2060 0 = None, C = with X = 1475 Z = 560 - 3 stage 935 - 2 stage st 41 1 = Control: Extended Operation; Y = 500 - 3 stage 835 - 2 stage 0 = None 1 = 630 - 3 stage 2245 - 2 stage 1 = Extended operation 2 = 800 - 3 stage 2345 - 2 stage nd 42 1 = Chilled Water Reset - 3 = 900 - 3 stage 2450 - 2 stage Outdoor Air Temperature Sensor 4 = 1000 - 3 stage 2560 - 2 stage 0 = None, 5 = 1120 - 3 stage 2675 - 2 stage 1 = Chi
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General Information HVAC = Heating, Ventilating, and Air Control Optional Packages Commonly Used Acronyms Conditioning For convenience, a number of OPST Operating Status Control acronyms are used throughout this IE = Internally-Enhanced Tubes GBAS Generic Building Automation manual. These acronyms are listed IPC = Interprocessor Communication Interface alphabetically below, along with the “translation” of each: LBU = La Crosse Business Unit EXOP Extended Operation AFD = Adaptive Frequency Drive
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General Information Compressors and Motor 1 (Left Overview hand), and 2 (Right hand) CDHF - CDHG Economizers 1(LH), and 2 (RH), See Figure 1 for General Unit Purge 1(LH), and 2 (RH), components. Each Chiller unit is Oil Tank/ Refrig. Pump 1 (LH), and 2 composed of the following (RH), components as viewed when facing Control Panel 1 (LH), and 2 (RH) the control panel front side: And when specified Unit mounted Common Evaporator and Common Starters 1 (LH) and 2 (RH) (not Condenser sh
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General Information Figure 2. General Duplex unit components (2 stage compressor) CDHF-SVU01C-EN 9
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General Information Here, the refrigerant gas is again Compressor 1 or 2 (2 Stage) Cooling Cycle compressed, and then discharged Compressed gas from the first-stage Duplex Chillers have two refrigerant through the third-stage variable guide impeller is discharged through the circuits that operate as their own second-stage variable guide vanes vanes and into the third stage independent circuits. These circuits impeller. and into the second-stage impeller. are discussed as individual chiller Here,
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General Information Figure 3. Pressure enthalpy curve (3 stage compressor) Figure 4. 2-stage economizer (3 stage compressor) CDHF-SVU01C-EN 11
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General Information Figure 5. Pressure enthalpy curve (2 stage compressor) Figure 6. Single stage economizer (2 stage compressor) CDHF-SVU01C-EN 12
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General Information ™ ™ DynaView Human Interface TechView Chiller Service Tool Overview — For the operator — For the service technician or Controls Operator Interface Day-to-day operational information is advanced operator Information is tailored to operators, All chiller status, machine presented at the panel. Up to seven service technicians and owners. configuration settings, customizable lines of data (English or SI units) are limits, and up to 60 active or historic When operating a chiller,
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General Information The large timeline cylinder indicates CTV Duplex Sequence Of Operation Power Up Diagram: the upper level operating mode, as it This section will provide basic The Power up chart shows the would be viewed on DynaView. Text information on chiller operation for respective DynaView screens during common events. With in Parentheses indicates sub-mode a power up of the main processor. microelectronic controls, ladder text as viewed on DynaView. Text This process takes from 30 to 50
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General Information Figure 8. CDHE/F/G sequence of operation: auto to running Figure 9. CDHE, CDHF, and CDHG sequence of operation: running This diagram shows the sequence of operations for a start of the first compressor on a duplex chiller. The ‘First’ compressor will be determined by the type of duplex start selected. Staging Second Compressor On: This diagram shows the sequence of operations where the ‘First’ compressor is all ready running, and the ‘second’ compressor is staged on. The ‘Fir
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General Information Staging Second Compressor Off: This diagram shows the sequence of operations where there is no longer a need to run the ‘Second’ compressor, so it is staged off. The ‘First’ and ‘Second’ compressor will be determined by the type of duplex start selected Figure 10. CDHE/F/G sequence of operation: staging second compressor off Satisfied Setpoint: This diagram shows the sequence of operations where the setpoint has been satisfied, and the last compressor is staged off. Figure 11
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General Information Duplex Compressor Sequencing Fixed Sequence – Compressor 1/ adjustable (via service tool) (default = Four methods (Two fixed sequence Compressor 2 (Default mode) 30%, range from 0 to 50%). methods, a balanced start and hour’s If the chiller is in the Auto mode and Compressor 2 will be shut down and method, and a no staging method) all interlocks have been satisfied, compressor 1 will run until water are provided for order of a compressor 1 will be started based temperature dr
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General Information Fixed Sequence – Compressor 2 / starts. Both compressors will run If chilled water reset is used, the Compressor 1 until chiller average capacity drops upstream compressor usually will be If the chiller is in the Auto mode and below Stage off Load point for 30 the most efficient compressor to operate at part load. If the leaving all interlocks have been satisfied, seconds. The stage off load point is water temperature is reset and the compressor 2 will be started based also a
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General Information Sequencing - Balanced Starts and restart inhibit) or a circuit diagnostic, Hours then the other compressor will be When desired to balance the wear started. The second compressor will between the compressors. This stage on when chiller capacity method will extend the time between exceeds the Stage on Load point for maintenance on the lead compressor. 30 seconds. When chiller capacity When balanced starts and hours is falls below Stage off Load point for selected, the compress
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General Information Simultaneous Compressor Start/ If the chiller is in the Auto mode and Stop all interlocks have been satisfied, Both compressors will start in close compressor 1 will be started based succession to minimize the time it on the leaving water temperature takes for the chiller to reach full load. rising above the “Differential to Start” Some process applications need the setting. When compressor 1 is at chiller to start and generate capacity speed, compressor 2 will start. Both as
