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Daikin McQuay AGZ-D, Operating And Maintenance Manual, Page: 79 / 82

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Daikin McQuay AGZ-D Operating And Maintenance Manual Download Page 79

Summary of Contents for McQuay AGZ-D

Page 1: ...Maintenance Manual OMM 1087 Group Chiller Part Number OMM 1087 Effective October 2011 Supercedes October 2010 Air Cooled Scroll Compressor Chiller AGZ D 25 to 190 Tons 50 60 Hertz R 410A Software Vers...

Page 2: ...r 44 Navigating 45 Menus 47 Optional Low Ambient Fan VFD 60 VFD Interface HMI 61 Recommended Periodic Inspection 65 Optional BAS Interface 65 Startup 66 Operation 68 Unit Maintenance 72 Planned Mainte...

Page 3: ...otection automatic compressor lead lag to alternate the compressor starting sequence and sequenced starting of compressors The electrical control center includes all equipment protection and operating...

Page 4: ...water flow through the evaporator as the load changes McQuay chillers are designed for this duty provided that the rate of change in water flow is slow and the minimum and maximum flow rates for the v...

Page 5: ...lycol from the freezing point tables below It is recommended that a minimum of 25 solution by weight be used for protection against corrosion or that additional compatible inhibitors be added Concentr...

Page 6: ...an sea level refer to Table 6 and Table 7 Evaporator Temperature Drop Factors Performance tables are based on a 10 F 5 C temperature drop through the evaporator Adjustment factors for applications wit...

Page 7: ...8 1 009 0 995 1 007 0 982 1 003 0 959 0 996 12 6 7 1 007 1 011 1 004 1 010 0 991 1 006 0 967 0 998 14 7 7 1 014 1 014 1 011 1 013 0 998 1 009 0 974 1 001 2000 feet 16 8 9 1 022 1 016 1 018 1 014 1 005...

Page 8: ...014 0 879 0 995 6000 feet 16 8 9 1 006 1 031 0 992 1 027 0 952 1 016 0 882 0 996 6 3 3 0 979 1 034 0 966 1 031 0 927 1 019 0 859 1 000 8 4 4 0 984 1 036 0 971 1 032 0 932 1 021 0 863 1 002 10 5 6 0 9...

Page 9: ...ze 15 F to 60 F 9 4 C to 15 6 C Chilled water Delta T range 6 degrees F to 16 degrees F 3 3 degrees C to 8 9 degrees C Part load minimum flow for variable flow systems varies with unit size see Table...

Page 10: ...e for curve cross reference See following page for curve cross reference and min max flow rates AGZ Water Pressure Drop A B B C C D D E E F F G G H H I I J J K K L L M M N N O O P P Q Q R R S S T T U...

Page 11: ...5 3 134 6 12 5 8 5 37 3 215 4 30 5 13 6 91 0 H 065D 87 2 4 5 5 5 13 4 139 4 11 0 8 8 32 8 223 1 26 9 14 1 80 1 I 070D 96 2 5 4 6 1 16 2 153 8 13 3 9 7 39 6 246 1 32 5 15 5 96 8 J 075D 109 7 5 3 6 9 15...

Page 12: ...12 AGZ 025D through 190D OMM 1087 Figure 2 Typical Field Control Wiring...

Page 13: ...lection 22 Unit States 22 Start Delays 23 Evaporator Pump Control 24 Leaving Water Temperature LWT Reset Target 25 Unit Capacity Control 26 Unit Capacity Overrides 27 Circuit Control Functions 29 Circ...

Page 14: ...memory and can be easily displayed in plain English for operator review The MicroTech III chiller controller will also retain and display the date time the fault occurred In addition to displaying al...

Page 15: ...t Enable X7 Circuit 1 MHP Switch Fault No fault X8 Circuit 1 Motor Protection Fault No fault DI1 Circuit 1 or Unit PVM GFP Fault No fault Digital Outputs Description Output Off Output On DO1 Compresso...

Page 16: ...M1 EXV Stepper Coil 1 M2 M2 EXV Stepper Coil 2 Sensor Information Temperature All temperature sensors will be McQuay part number 1934146 Pressure Pressure inputs will be read using 0 to 5 volt ratiom...

Page 17: ...mit Enable Off Off On Network Capacity Limit 100 0 to 100 LWT Reset Enable Off Off On Configuration Power Input Single Point Single Point Multi Point Evap Control 1 Only 1 Only 2 Only Auto 1 Primary 2...

Page 18: ...42 to 170 PSI Condenser Condenser Target 100 37 78 C 100 F 32 22 to 37 78 C 90 to 100 F Condenser Target 67 32 22 C 90 F 32 22 to 37 78 C 90 to 100 F Condenser Target 50 29 44 C 85 F 29 44 to 32 22 C...

Page 19: ...ent Lockout Fan VFD Range no for all circuits 1 7 to 15 6 C 35 1 to 60 1 F yes on any circuit 23 3 to 15 6 C 9 9 to 60 1 F Special Set Point Operations The following setpoints are not changeable unles...

Page 20: ...oller setpoints may be changed If the operator attempts to edit a setpoint for which the necessary password level is not active no action will be taken Once a password has been entered it remains vali...

Page 21: ...ture LWT target Control Band LWT target 3 9 C If the unit is configured for use with glycol the compressor staging temperatures are calculated as shown below Stage Up Temperature LWT target Control Ba...

Page 22: ...s is to avoid changing modes of operation inadvertently while the chiller is running Unit Mode is set according to the following table Control Source Set Point Mode Input BAS Request Available Modes S...

Page 23: ...void tripping a false alarm Ice Mode Start Delay An adjustable start to start ice delay timer will limit the frequency with which the chiller may start in Ice mode The timer starts when the first comp...

Page 24: ...nit State Auto max pulldown rate has been met or exceeded 16 Auto Unit Cap Limit Unit State Auto unit capacity limit has been met or exceeded 17 Auto High Ambient Limit 18 Config Changed Reboot Requir...

Page 25: ...greater than the recirculate timeout set point and there is no flow then the primary pump will shut off and the standby pump will start When the evaporator is in the run state if flow is lost for mor...

Page 26: ...bed Compressor Staging in Cool Mode The first compressor on the unit should be started when evaporator LWT is higher than the Startup Temperature Additional compressors can be started when Evaporator...

Page 27: ...t to start if starts are equal the one with the least run hours will be next to start if run hours are equal the lowest numbered one will be next to start Next to Stop If both circuits have an equal n...

Page 28: ...66 7 Limit 50 3 50 Limit 33 3 2 33 3 Limit 1 Maximum LWT Pulldown Rate The maximum rate at which the leaving water temperature can drop shall be limited by the Maximum Pulldown Rate set point only whe...

Page 29: ...w Evaporator Pressure Unload set point The equation is as follows Pumpdown pressure Low Evap Pressure Unload set point 103KPA 15 PSI Circuit Control Logic Circuit Enabling A circuit should be enabled...

Page 30: ...te Pumpdown Circuit switch is open Circuit mode is disable Circuit Pumpdown alarm is active T4 Pumpdown to Off Any of the following are required Evaporator Pressure Pumpdown Pressure Value Unit State...

Page 31: ...the third failed Low Ambient Start attempt the Restart Alarm is triggered and the circuit will not attempt to restart until the Restart alarm has been cleared The restart counter should be reset when...

Page 32: ...cled the cycle timers should not be active These timers may be cleared via a setting on the human machine interface HMI Condenser Fan Control Condenser fan control should stage fans as needed any time...

Page 33: ...ne through four should use their respective dead bands Stages five through seven should all use Stage Down Dead Band 4 When the saturated condenser refrigerant temperature is below the target the acti...

Page 34: ...l and tube type evaporator When staging down a compressor the maximum position is reduced by 10 for one minute to prevent liquid from getting to compressors After this initial one minute delay the val...

Page 35: ...rms are classified in the following sections per the Global Chiller Protocol Standard using the Fault Problem Warning scheme When any Unit Fault Alarm is active the alarm digital output should be turn...

Page 36: ...en Action Taken Normal stop all circuits Reset This alarm can be cleared manually via the keypad or BAS command but only if the sensor is back in range Outdoor Air Temperature Sensor Fault Trigger Sen...

Page 37: ...oller and the extension module is working for 5 seconds or Expansion Valve Type Thermal Unit Problem Alarms Low Ambient Lockout Trigger The OAT drops below the low ambient lockout set point AND the OA...

Page 38: ...eset is enabled For this alarm out of range is considered to be a signal less than 3mA or more than 21mA Action Taken Cannot use LWT reset function Reset Auto clear when LWT reset is disabled or LWT r...

Page 39: ...e evaporator pressure sensor fault is active Action Taken Rapid stop circuit Reset This alarm can be cleared manually via the keypad if the evaporator pressure is above 137 9 KPA 20 PSI High Condenser...

Page 40: ...alarm can be cleared manually via the keypad or BAS command but only if the sensor is back in range Suction Temperature Sensor Fault Trigger Sensor shorted or open and Expansion Valve Type Electronic...

Page 41: ...f the circuit is no longer in the run state High Condenser Pressure Unload Trigger This event is triggered if all of the following are true circuit state Run more than one compressor is running on the...

Page 42: ...orator Pressure Unload set point for a time greater than half of the current freezestat time circuit is not currently in a low OAT start it has been at least 30 seconds since a compressor has started...

Page 43: ...ents which includes the date and time each occurred Clearing Alarms Active alarms can be cleared through the keypad display or a BAS network Alarms are automatically cleared when controller power is c...

Page 44: ...ns a menu title a parameter such as a value or a setpoint or a link which will have an arrow in the right of the line to a further menu The first line visible on each display includes the menu title a...

Page 45: ...hich can also be accessed by pressing the Menu Button The navigating wheel is the only navigating device necessary although the MENU ALARM and BACK buttons can provide shortcuts as explained later Pas...

Page 46: ...return to the navigation mode A parameter with an R is read only it is giving a value or description of a condition An R W indicates a read and or write opportunity a value can be read or changed pro...

Page 47: ...reen s from which you can navigate to it is also shown on the same row as the screen identifier Example Enter Password in screen U 2 is linked from Screen U 1 For most circuit or compressor level para...

Page 48: ...R U 17 LON Setup R U 18 BACnet IP Setup R U 19 BACnet MSTP Setup R U 20 Modbus Setup R U 21 AWM Setup R U 22 Configuration U 23 Ctrlr IP Setup R U 24 Design Conditions R U 25 Alarm Limits R U 26 Calib...

Page 49: ...d Operator Links to screen Alarm Active U 30 Alarm Log U 31 Unit Status Settings U 33 Circuit 1 Status Settings Cx 2 Circuit 2 Status Settings Cx 2 Scheduled Maintenance U 8 U 10 From Screen U 1 Manua...

Page 50: ...R R OBH GUID R R Screen U 13 From Screen U 4 Status Settings No password Operator Links to screen Unit Status R Next Compressor On R Next Compressor Off R Chiller Enable R Control Source R Chiller Ena...

Page 51: ...lta T R Active Set Point R Start Up Temperature R Shut Down Temperature R Stage Up Temperature R Stage Down Temperature R Pulldown Rate Outside Air Temperature R Cool LWT Setpoint 1 R W Cool LWT Setpo...

Page 52: ...k R Actual Gateway R Given IP Address R W Given Mask R W Given Gateway R W Unit Support R W NC Dev 1 R W NC Dev 2 R W BACnet BSP R Screen U 20 From Screen U 4 U 11 BACnet MSTP Setup No password Operat...

Page 53: ...sword Operator Links to screen Apply Changes Number Of Compressors Expansion Valve Type Number Of Fans Fan VFD Enable Power Configuration Comm Module 1 Type Comm Module 2 Type Comm Module 3 Type Scree...

Page 54: ...ssure Shutdown Setpoint Low Ambient Lockout Setpoint Low Ambient Start Time Evaporator Water Freeze Evaporator Flow Proof Evap Recirculate Timeout Screen U 27 From Screen U 4 U 11 Calibrate Sensors No...

Page 55: ...rcuit 2 R U 38 Screen U 33 From Screen U 9 Unit Status Settings No password Operator Links to screen Actual Time Actual Date Unit Status Unit Mode Unit Capacity Evap Leaving Water Temp Evap Entering W...

Page 56: ...een Day Selection R W Count R Last Occurrence R Screen U 37 From Screen U 32 Circuit 1 Event Log No password Operator Links to screen Event Selection R W Day Selection R W Count R Last Occurrence R Sc...

Page 57: ...essor Start Last Compressor Stop Compressor 3 4 Run Hours Number Of Starts Last Compressor Start Last Compressor Stop Compressor 5 6 Run Hours Number Of Starts Last Compressor Start Last Compressor St...

Page 58: ...Compressor 5 6 Output State Liquid Line Solenoid Output State Hot Gas Bypass Output State Fan Output 1 State Fan Output 2 State Fan Output 3 State Fan Output 4 State Fan Output 5 State Fan VFD Speed S...

Page 59: ...VFD Min Speed Cond Target 100 Cond Target 67 Cond Target 50 Cond Target 33 Screen Cx 7 From Screen Cx 1 EXV No password Operator Links to screen EXV State Suction Superheat Superheat Target EXV Contro...

Page 60: ...tput to the Motor WARNING Avoid swapping any 2 of the 3 motor lead connections which will cause reversal of the motor direction In applications where reversed rotation could cause equipment damage or...

Page 61: ...button will return to the Frequency Reference display 3 Moves the cursor to the right Resets the drive to clear a fault situation 4 RUN Key Starts the drive in LOCAL mode 5 Up Arrow Key Scrolls up to...

Page 62: ...onInputs of the drive OP Displayed when the frequency reference is assigned to an Option Unit of the drive 6 FrequencyRefe rence Assignment 1 RP Displayed when the frequency reference is assigned to t...

Page 63: ...n the operator is selected for Run command and frequency reference control REMOTE During run During deceleration to stop When a Run command is input and frequency reference is 0 Hz While the drive was...

Page 64: ...outputs do not operate Operation Errors The drive will not operate the motor until the error has been reset Correct the settings that caused the operation error to clear the error Tuning errors occur...

Page 65: ...ays for excessive noise Check for over or undervoltage Relays and Contactors Inspect for signs of overheating such as melted or cracked insulation Replace damaged parts Optional BAS Interface The AGZ...

Page 66: ...control band before the MicroTech III controller will stage on cooling 4 Set the Evap Delta T and the Start Delta T as a starting point 5 Put both pumpdown switches PS1 and PS2 to the ON position 6 Pu...

Page 67: ...acing the chiller into service Pre Startup Refrigerant Piping Checkout 1 Check all exposed brazed joints for evidence of leaks Joints may have been damaged during shipping or when the unit was install...

Page 68: ...porlan HGBE 8 75 150 1 1 8 ODF on AGZ 070 to 190 They are factory set to begin opening at 100 psig R 410A and can be changed by changing the pressure setting The adjustment range is 75 to 150 psig To...

Page 69: ...full load indicates a shortage of refrigerant a plugged filter drier or a restriction in the liquid line However it is not unusual to see bubbles in the sight glass during changing load conditions Re...

Page 70: ...h 180C The evaporator is direct expansion shell and tube type with water flowing in the baffled shell side and refrigerant flowing through the tubes Two independent refrigerant circuits within the eva...

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Page 72: ...e caution when applying such cleaners as they can contain potentially harmful chemicals Care should be taken not to damage the fins during cleaning The coils should be thoroughly rinsed to remove any...

Page 73: ...r changed or verify moisture content by performing an acid test on the compressor oil Planned Maintenance Schedule OPERATION WEEKLY MONTHLY Note 1 ANNUAL Note 2 General Complete unit log and review No...

Page 74: ...410A is rose light maroon Must be DOT approved R 410A with 400 psig rating Open cylinders slowly Avoid rough handling of cylinders and secure as appropriate Cap when not in use Do not overfill recover...

Page 75: ...frostbite Ball valve type recommended Charge to 80 85 of normal charge before starting the compressors Charging procedure The units are factory charged with R 410A Use the following procedure if rech...

Page 76: ...rsonnel familiar with equipment operation maintenance correct servicing procedures and the safety hazards inherent in this work Causes for repeated tripping of equipment protection controls must be in...

Page 77: ...re is no power to the coil The solenoid coil can be removed from the valve body without opening the refrigerant piping after pumpdown For personal safety shut off and lock out the unit power The coil...

Page 78: ...recirculation 6 Clean coil 7 Correct 1 Refrigerant flood back 1 Correct 2 Wind blowing into coil at low ambient 2 Shield coil from direct wind Wind guards are available 3 Faulty condenser temperature...

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Page 80: ...unded wiring in motor 2 Replace compressor motor Motor Overload Relays or Circuit Breakers Open 3 Loose power wiring or burnt contactors 4 High condenser temperature 5 Power line fault causing unbalan...

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Page 82: ...lick on training or call 540 248 9646 and ask for the Training Department Warranty All McQuay equipment is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty...

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