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IOM 1281-2 • CENTRIFUGAL WATER CHILLERS 2 

www.DaikinApplied.com

Table of Contents

Manufactured in an ISO 9001 & ISO 14001 certified facility

©2023 Daikin Applied, Minneapolis, MN. All rights reserved throughout the world.This document contains the most current product information as 

of this printing. Daikin Applied Americas Inc. has the right to change the information, design, and construction of the product represented within the 

document without prior notice. For the most up-to-date product information, please go to www.DaikinApplied.com. 

™® MicroTech, SiteLine, and Daikin Applied are trademarks or registered trademarks of Daikin Applied Americas Inc. The following are trademarks 

or registered trademarks of their respective companies: BACnet from American Society of Heating, Refrigerating and Air-Conditioning Engineers, 

Inc.; Echelon, LonWorks, LonMark, and LonTalk from Echelon Corporation; Modbus from Schneider Electric; and Windows from Microsoft 

Corporation.

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Hazard Identification Information

. . . . . . . . . . . . . . . 5

General Description . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Receiving and Handling . . . . . . . . . . . . . . . . . . . . . . 7
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operating Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Field Insulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Water Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Water Quality Guidelines . . . . . . . . . . . . . . . . . . . . 10
Vessel Drains at Startup  . . . . . . . . . . . . . . . . . . . . 11
Flow Switches  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Variable Fluid Flow Rates  . . . . . . . . . . . . . . . . . . . 11
System Water Volume  . . . . . . . . . . . . . . . . . . . . . . 11
System Pumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Condenser Water Temperature Control . . . . . . . . . 11
Cooling Tower Control  . . . . . . . . . . . . . . . . . . . . . . 12
Water Side Economizer Cycle Operation. . . . . . . . 12
Relief Valves  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Oil Coolers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Oil Heater. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Field Wiring  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Building Automation Systems (BAS)  . . . . . . . . . . . 19
Use with On-Site Generators . . . . . . . . . . . . . . . . . 19
Field Wiring, Controls & Starters  . . . . . . . . . . . . . . 20

Retrofit Knockdown

  . . . . . . . . . . . . . . . . . . . . . . . . 25

Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Dual/Multi-Chiller Operation. . . . . . . . . . . . . . . . . . 33
Ice Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . 34
Operator Responsibilities. . . . . . . . . . . . . . . . . . . . 34
Operator Schools . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Unit Enabling/Disabling  . . . . . . . . . . . . . . . . . . . . . 34
Human Machine Interface (HMI)  . . . . . . . . . . . . . . 35
Tower Control Settings  . . . . . . . . . . . . . . . . . . . . . 50
Alarms  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Controller Inputs and Outputs  . . . . . . . . . . . . . . . . 61

Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . 63

         

Содержание WDC

Страница 1: ...Operation and Maintenance Manual Centrifugal Chillers Model WDC WCC A Vintage 600 to 2700 Tons 2100 to 9500 kW R 134a or R 513A Refrigerant 60 50 Hz IOM 1281 2 Group Chiller Part Number IOM1281 2 Dat...

Страница 2: ...orks LonMark and LonTalk from Echelon Corporation Modbus from Schneider Electric and Windows from Microsoft Corporation Table of Contents Introduction 5 Hazard Identification Information 5 General Des...

Страница 3: ...cal Code and local codes See Note 4 Condenser pump starting relay CP1 2 installed and wired See Note 3 Miscellaneous Yes No N A Initials Oil cooled water piping complete Units with water cooled oil co...

Страница 4: ......

Страница 5: ...ay be present in this Daikin Applied product POE oil if ever in contact with PVC CPVC will coat the inside wall of PVC CPVC pipe causing environmental stress fractures Although there is no PVC CPVC pi...

Страница 6: ...efrigerant The controls are pre wired adjusted and tested Only normal field connections such as piping electrical and interlocks etc are required thereby simplifying installation and increasing reliab...

Страница 7: ...damage to the control panels and refrigerant piping See the certified dimension drawings included in the job submittal for the weights and center of gravity of the unit If the drawings are not availab...

Страница 8: ...ove the top of the chiller The U S National Electric Code NEC or local codes can require more clearance in and around electrical components and must be checked for compliance Mounting The unit must be...

Страница 9: ...See Note3 111 43 9 Oil Cooler Entering Fluid 35 1 7 80 26 7 35 1 7 80 26 7 Equipment Room Air 40 4 4 104 40 40 4 4 104 40 NOTES 1 Contact a Daikin Applied representative for performance at specific o...

Страница 10: ...o allow vessel isolation The chiller must be capable of draining the water from the evaporator or condenser without draining the complete system Piping must be supported to eliminate weight and strain...

Страница 11: ...of the compressors or loss of control In air conditioning systems the potential for short cycling usually exists when the building load falls below the minimum chiller plant capacity or on close coup...

Страница 12: ...enser control method is to use a modulating two way control valve located on the outlet connection of the condenser The valve will be nearly closed at startup to restrict water flow which keeps genera...

Страница 13: ...must remain closed until startup by the factory service technician Remove plastic shipping plugs if installed from the inside of the valves prior to making pipe connections Whenever vent piping is ins...

Страница 14: ...re drop across the evaporator is less than the oil cooler the oil cooler must be piped across the chilled water pump provided that its pressure drop is sufficient The water flow through the oil cooler...

Страница 15: ...FUGAL WATER CHILLERS Oil Heater The oil sump is equipped with an immersion heater that is installed in a tube so that it can be removed without disturbing the oil Figure 9 Oil Cooler Water Connection...

Страница 16: ...M 1281 2 CENTRIFUGAL WATER CHILLERS 16 www DaikinApplied com Installation Figure 11 Oil Cooler Piping Across Chilled Water Pump Models 079 126 Figure 12 Oil Cooler Piping With City Water Models 079 12...

Страница 17: ...G WATER TEMPERATURE P104 CONDENSER ENTERING WATER TEMPERATURE P104 CONDENSER LEAVING WATER TEMPERATURE P104 LIQUID LINE TEMPERATURE CHECK VALVE CONDENSER EVAPORATOR SHUTOFF VALVE ELECTRONIC EXPANSION...

Страница 18: ...hnician Serious damage can result if the compressor starts in the wrong direction and would not be covered by product warranty The compressor is covered under UL 984 by which its terminal box is deter...

Страница 19: ...rs strictly conform to the interoperability guidelines of the LonMark Interoperability Association and BACnet International They have received LonMark certification with optional LonWorks communicatio...

Страница 20: ...and 21 and remove wire jumper 6 Evaporator and condenser flow switches are required Thermal dispersion flow switches are installed and wired from the factory as standard 7 Customer supplied 24 to 230...

Страница 21: ...Installation www DaikinApplied com 21 IOM 1281 2 CENTRIFUGAL WATER CHILLERS Figure 16 Field Wiring Schematic...

Страница 22: ...IOM 1281 2 CENTRIFUGAL WATER CHILLERS 22 www DaikinApplied com Installation Figure 17 Compressor Control Box...

Страница 23: ...Installation www DaikinApplied com 23 IOM 1281 2 CENTRIFUGAL WATER CHILLERS Figure 18 Unit Control Box...

Страница 24: ...d not yet installed keep it pumped down as shipped from the factory and close all refrigerant valves 5 Keep oil sump valves closed to avoid refrigerant migration to the oil sump Over a long term the r...

Страница 25: ...letely assembled with the full refrigerant charge which must be recovered before breaking any refrigerant connection The refrigerant charge must be removed from the unit if the vessels are to be separ...

Страница 26: ...them Refrigerant will not be shipped with the chiller and must be procured by others Compressor s and vessels receive an inert gas holding charge that must be released prior to attempting to open any...

Страница 27: ...olling dollies supporting the full length of the compressor may also be used Note component weights and dimensions are listed in Table 7 and Table 8 Figure 21 Vessel Stack Lifting Rigging Setup Figure...

Страница 28: ...places to prevent damage 7 Remove oiler cooler lines providing block off caps at the the compressor gear housing connections see Figure 25 Blockoffs will also be needed at the evaporator and condenser...

Страница 29: ...t Leave the mounting bolts loose until the suction and discharge lines are in place and aligned Before tightening the couplings position the suction and discharge piping so that the compressor can be...

Страница 30: ...IOM 1281 2 CENTRIFUGAL WATER CHILLERS 30 www DaikinApplied com Installation Figure 27 Liquid Line Assembly Figure 28 Oil Sump Oil Cooler Assembly...

Страница 31: ...FROM TERMINAL BLOCK LOCATED IN THE COMPRESSOR TERMINAL BOX IF STARTER IS FREESTANDING OR FIELD MOUNTED CLFS FLOW SWITCHES ELFS COMPRESSOR CONTROL BOX CS4 OIL SUMP TEMP CS5 CMPR SUCTION TEMP CS7 CMPR...

Страница 32: ...l r oc UNIT BOX CABLES DID DESCRIPTION US2 EVAP ENTERING WATER TEMP US3 COND ENTERING WATER TEMP US4 COND LEAVING WATER TEMP USS LIQUID LINE TEMP US9 OPT HEAT RECOVERY ENTERING TEMP US10 OPT HEAT RECO...

Страница 33: ...chilled water sensors must be moved far enough downstream from the last chiller to insure reading a thoroughly mixed water temperature Passing through one or two elbows will usually suffice Series chi...

Страница 34: ...Interface HMI switches or BAS interface which ever is selected A method of migration freeze protection needs to be in place when the chiller terminates ice mode This is usually sensed by the liquid l...

Страница 35: ...ed at the lower right hand edge of the display panel Screen control buttons are located to either side of it and elicit on screen prompts when pressed The HMI is equipped with a screen saver a blank b...

Страница 36: ...ICE and HEAT For example Cool Ice w Glycol is an available mode setpoint but the chiller can only be in either COOL or ICE mode at any given time Compressor Status shown for each unit compressor 1 onl...

Страница 37: ...re 35 to Figure 37 Figure 35 Mechanical Switch Source Figure 36 Digital Remote Switch Source Figure 37 BAS Network Source III Additional Home View Trend Data Graphs Entering and leaving evaporator wat...

Страница 38: ...IOM 1281 2 CENTRIFUGAL WATER CHILLERS 38 www DaikinApplied com Operation Figure 39 Unit Detail View Screen...

Страница 39: ...plied com 39 IOM 1281 2 CENTRIFUGAL WATER CHILLERS Figure 40 Evaporator Information Figure 41 Compressor Details NOTE Chiller data will populate in the Power box if the Full Metering capability has be...

Страница 40: ...igure 42 To open the vanes loading compressor solenoid SA is de energized and SB is energized allowing oil flow from port SA to one side of the piston other side drains through port SB To close the va...

Страница 41: ...flow and keeps the chiller from short cycling under light load conditions while also reducing surge potential on heat recovery units The factory default setpoint for bringing on hot gas bypass is 20 o...

Страница 42: ...IOM 1281 2 CENTRIFUGAL WATER CHILLERS 42 www DaikinApplied com Operation Figure 43 Typical Oil Flow Diagram Models WDC...

Страница 43: ...Operation www DaikinApplied com 43 IOM 1281 2 CENTRIFUGAL WATER CHILLERS Figure 44 Condenser Information Figure 45 Expansion Valve Information...

Страница 44: ...c 2 MODES selects various unit parameters such as liquid injection timers pump staging control source unit mode etc 3 MOTOR selects power related setpoints such as amp limits 4 TOWER selects the metho...

Страница 45: ...r decrease the value displayed Some setpoints are selectable text menus rather than numeric values Select the desired option using the drop down menu that appears on that particular setpoint Toggle be...

Страница 46: ...or leaving water temperature in Cool with Glycol or Cool ICE mode When running in the ICE portion of the mode the temperatures limit to the lower range of 15 35 F Leaving Water Temp Ice 25 0 F 15 0 to...

Страница 47: ...w Glycol Cool Ice w Glycol Ice Only w Glycol Cool Heat Heat Only M See Water Setpoints Table 12 for control temperature targets for each mode No of Compressors 2 1 to 2 T Models will be set to 2 as a...

Страница 48: ...ease is inhibited Min Leaving Water Temp Rate 0 2 F min 0 1 to 5 0 F min M Sets value below which an additional compressor can stage on Demand Limit Enable OFF ON OFF M ON Limits RLA to a value set by...

Страница 49: ...D stage or valve SP VFD stage VFD Stage Up 80 0 to 100 T Valve position above which the fans can stage up Tower Valve Fan VFD Strategy Valve Stage VFD speed above which the fans can stage up Tower Val...

Страница 50: ...n page 49 Setpoint for Cooling Tower Control on the TOWER Setpoint Screen sets the type of control NONE is selected as default Choose TEMPERATURE for entering condenser water control or LIFT to define...

Страница 51: ...Valve Control Error Gain The default is 20 5 Set the Valve Control Slope Gain The default is 1 F If LIFT was selected for Cooling Tower Control set the Valve Target Lift default is 30 psi This setpoi...

Страница 52: ...olled See Figure 59 and Figure 60 To set up in HMI The following settings are used for the Tower Fan Staging Only mode 1 Select TEMP if Cooling Tower Control is based on condenser EWT or LIFT if based...

Страница 53: ...FD speed reaches the maximum value that was set In addition Figure 62 shows that the default temperature at which the valve opens completely is 65 F This temperature is the Valve SP also called Valve...

Страница 54: ...d may need to be lowered if glycol is added to the system Similarly changing setpoint below 30 psi default requires glycol to be added to the system otherwise there is a risk of freezing the evaporato...

Страница 55: ...sec 10 to 240 sec T Unload Timer 60 sec 5 to 300 sec T Postlube Timer 30 sec 10 to 240 sec T Figure 66 Settings View Interface Table 18 Unit Interface Settings Description Default Range PW Comments B...

Страница 56: ...ory reference the Alarms section Alarms The Alarm information Figure 68 and Figure 69 is accessed by touching the ALARM icon at the bottom of the HMI and then the Active or History tabs at the top of...

Страница 57: ...by being indicated in Red on the HMI and will prevent the chiller from running until manually cleared at the HMI or via the BAS Critical Alarms that require external intervention Communication and Se...

Страница 58: ...Copy Service Trends is only available with the technician level password Copy Customer Trends is available for all password levels 5 Repeat this process for each desired day of history Each day must b...

Страница 59: ...N or UNLOAD Rapid Stop Manual Low Oil Pressure Start Compressor State START for 30 sec Rapid Stop No Start Manual Evaporator Water Flow Loss Evaporator Flow DI No Flow for Evap Flow Loss Delay SP OR N...

Страница 60: ...Unload setpoint Unload Auto Evaporator Freeze Protect Evap Sat Refr Temp Evaporator Freeze SP Start evaporator pump and oil pump While unit is not running Auto Condenser Freeze Protect Cond Sat Refr T...

Страница 61: ...NTC Thermistor 10k 25 C 40 to 125 C Leaving Heat Recovery Temperature Chiller NTC Thermistor 10k 25 C 40 to 125 C NOTE 1 Sensor Range in Table 21 indicates the range of the input NOT the operating ran...

Страница 62: ...tor 10k 25 C 40 to 125 C Table 26 Compressor Controller Digital Inputs Description Signal States Open Closed Compressor Switch Manual Off 0 to 24 VAC Stop Auto Mech High Pressure 0 to 24 VAC High Pres...

Страница 63: ...oil analysis at initial startup to provide a benchmark from which to compare future tests The local service office can recommend suitable facilities for performing these tests Oil Analysis on page 66...

Страница 64: ...de to operate and their operating points checked A control can shift its operating point as it ages and this must be detected so the controls can be adjusted or replaced Pump interlocks and flow switc...

Страница 65: ...heaters and allow 24 hours for heater to remove refrigerant from the oil before starting 2 Check and tighten all electrical connections 3 Replace the drain plug in the cooling tower pump if it was re...

Страница 66: ...o a saturated pressure above freezing 4 With a system gas pressure higher than the equivalent of a freezing temperature invert the charging cylinder and elevate the drum above the condenser With the d...

Страница 67: ...oisture introduced by the addition of either contaminated oil or refrigerant or improperly handled oil Liquid R 134a has the ability to retain up to 1400 ppm of water in solution at 100 degrees F With...

Страница 68: ...plier Figure 70 Thermal Dispersion Flow Switch and Adapter Mounting Figure 71 highlights the position of the electrical connector and indentation mark on flow switch It is required that the flow switc...

Страница 69: ...at the velocities indicated below GPM adjustment per or key input Default 20 cm sec 30 cm sec 50 cm sec 75 cm sec 100 cm sec 150 cm sec 200 cm sec 250 cm sec 300 cm sec 2 2 06 6 86 10 3 17 2 25 7 34 3...

Страница 70: ...or buttons 3 When power is initially applied to the flow switch all green LEDs light and go out step by step During this time the output is closed The unit is in the operating mode 4 When making manu...

Страница 71: ...rt of standard initial warranty service 5 Oil filter change and compressor teardown and inspection should be done based on the results of the annual oil test performed by a company specializing in thi...

Страница 72: ......

Страница 73: ...above such free labor does not include diagnostic visits inspections travel time and related expenses or unusual access time or costs required by product location 2 Refrigerants fluids oils and expen...

Страница 74: ...is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local Daikin Applied representative for warranty details To find your local Daikin Applied...

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