manualshive.com logo in svg

Daikin 025D, Operating & Maintenance Manual

Share
Download
Daikin 025D Operating & Maintenance Manual Download Page 71

OMM 1166-1 

AGZ 025D through 190D 

71

 

about  12  hours  to  allow  the  system  to  reach  equilibrium  before  deciding  if  the  system  requires  a 
change of drier cores. 

Bubbles in the sight glass at constant 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. 

Refrigerant Charging 

Liquid line subcooling at the liquid shut-off valve should be between 15 and 20 degrees F at full load.  
If the unit is at steady full load operation and bubbles are visible in the sight glass, then check liquid 
subcooling. 

Thermostatic Expansion Valve 

The expansion valve performs one specific function.  It keeps the evaporator supplied with the proper 
amount of refrigerant to satisfy the load conditions. 

NOTE

:  Before  adjusting  superheat,  check  that  unit  charge  is  correct  and  liquid  line  sight  glass  is  full 

with no bubbles and that the circuit is operating under stable, full load conditions. 

The suction superheat for the suction leaving the evaporator is set at the factory for 8 to 12 degrees F 
at  full  load.    To  have  full  rated  unit  performance,  the  superheat  must  be  about  8  degrees  F  at  95°F 
outdoor ambient temperature. 

Crankcase Heaters 

The  scroll  compressors  are  equipped  with  externally  mounted  band  heaters  located  at  the  oil  sump 
level.  The function of the heater is to keep the temperature in the crankcase high enough to prevent 
refrigerant from migrating to the crankcase and condensing in the oil during off-cycle. 

Power must be supplied to the heaters 8 hours before starting the compressors. 

Evaporator 

Models AGZ 025D through 130D 

The  evaporator  is  a  compact,  high  efficiency, dual circuit, brazed, plate-to-plate type heat exchanger 
consisting of parallel stainless steel plates. 

The  evaporator  is  protected  with  an  electric  resistance  heater  and  insulated  with  3/4"  (19mm)  thick 
closed-cell  polyurethane  insulation.    This  combination  provides  freeze  protection  down  to  -20°F  (-
29°C) ambient air temperature.   

The  water  side  working  pressure  is  363  psig  (2503  kPa).    Evaporators  are  designed  and  constructed 
according to, and listed by, Underwriters Laboratories (UL). 

NOTE

: This product is equipped with a copper-brazed series 304 stainless steel plate evaporator.  The 

water or other fluid used in these evaporators must be clean and non-corrosive to the materials used in 
the evaporator. The use of non-compatible fluids can void the equipment warranty. If the compatibility 
of  the  fluid  with  the  evaporator  is  in  question,  a  professional  water  quality  consultant  should 
administer the proper testing and evaluate compatibility. 

 

Models AGZ 140D through 180D 

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  evaporator 
serve the unit's dual refrigerant circuits.   

The  evaporator  is  wrapped  with  an  electric  resistance  heater  cable  and  insulated  with  3/4"  (19mm) 
thick  vinyl  nitrate  polymer  sheet  insulation,  protecting  against  water  freeze-up  at  ambient  air 
temperatures  to  -20°F  (-29°C).   An  ambient  air  thermostat  controls  the  heater  cable.   The  fitted  and 
glued-in-place insulation has a K factor of 0.28 Btu in/hr ft

2

 

F at 75°F. 

Summary of Contents for 025D

Page 1: ...nance Manual OMM 1166 1 Group Chiller Part No OMM1166 1 Effective March 2014 Air Cooled Scroll Compressor Chiller AGZ025D AGZ190D Rev 0A 25 to 190 Tons 50 60 Hertz R 410A Software Version 251699201 2014 Daikin Applied ...

Page 2: ... Bypass Solenoid Valve 35 Capacity Overrides Limits of Operation 35 Alarms 35 Unit Fault Alarms 35 Unit Problem Alarms 37 Unit Warning Alarms 38 Circuit Fault Alarms 38 Circuit Events 40 Circuit Warning Alarms 41 Events 41 Unit Events 42 Circuit Events 42 Clearing AlarmsError Bookmark not defined Using the Controller 44 Navigating 45 Menus 47 Optional Low Ambient Fan VFD 60 VFD Interface HMI 61 Re...

Page 3: ...ures include compressor crankcase heaters an evaporator heater for chilled water freeze protection 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 controls necessary for dependable automatic operation This manual covers units with Software Version 25169920...

Page 4: ...olves changing the water flow through the evaporator as the load changes Daikin Applied 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 vessel are not exceeded The recommended maximum change in water flow is 10 percent of the change per minute When units are operated with flow rates less than nominal see Tabl...

Page 5: ... glycol 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 Concentrations above 35 do not provide any additional burst protection and should be carefully considered before using Table 1 Flow Tons Delta T Relationship Glycol Flow gpm Factor Correction Flow T Delta g...

Page 6: ...than 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 with temperature ranges from 6 F to 16 F 3 3 C to 8 9 C are in Table 6 and Table 7 Temperature drops outside this 6 F to 16 F 3 3 C to 8 9 C range can affect the control system s capability to maintain...

Page 7: ... 10 5 6 0 998 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 16 8 9 1 022 1 016 1 018 1 014 1 005 1 010 0 981 1 003 4000 feet 6 3 3 0 973 1 011 0 970 1 010 0 957 1 006 0 935 0 998 8 4 4 0 984 1 014 0 980 1 013 0 968 1 009 0 945 1 001 10 5 6 0 995 1 019 0 991 1 017 0 979 1 013 0 955 1 005 12 6 7...

Page 8: ... 025 0 949 1 014 0 879 0 995 16 8 9 1 006 1 031 0 992 1 027 0 952 1 016 0 882 0 996 8000 feet 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 0 990 1 037 0 976 1 033 0 937 1 022 0 868 1 002 12 6 7 0 993 1 039 0 980 1 035 0 941 1 024 0 871 1 004 14 7 7 0 998 1 041 0 985 1 037 0 945 1 026 0 875 1 006 16 8 9 1 003 1 041 0 990 1 038 0 ...

Page 9: ...per controller operation The software setting of Variable Evap Flow equals YES or NO is located just below the Full Cap D T setting screen The Full Cap D T setting will continue to allow settings from 6 to 16 F Delta T for full load operation Constant Chilled Water Flow Systems The minimum allowable flow is determined by the chiller model Operating with flows below these values can cause unstable ...

Page 10: ...ed for each unit Occasionally the same evaporator is used on multiple units resulting in overlapping lines The nominal and maximum flow and pressure drop are the same for a given unit size regardless of having fixed or variable flow The curves are based on water use only Use glycol adjustment factors located in the catalog Performance Section as required Figure 1 Evaporator Pressure Drops See foll...

Page 11: ... 3 15 3 134 6 12 5 8 5 37 3 224 3 33 0 14 2 98 6 065D I 55 8 1 9 3 5 5 8 87 1 4 5 5 5 13 4 139 4 11 0 8 8 32 8 232 3 29 0 14 7 86 7 070D J 61 5 2 3 3 9 7 0 96 1 5 4 6 1 16 3 153 8 13 3 9 7 39 7 256 3 35 1 16 2 104 9 075D J 70 2 2 3 4 4 6 8 109 6 5 3 6 9 15 8 175 4 12 9 11 1 38 5 292 3 34 0 18 4 101 6 080D L 77 8 2 2 4 9 6 7 121 6 5 2 7 7 15 6 194 6 12 8 12 3 38 2 324 3 33 8 20 5 101 0 090D M 85 6 ...

Page 12: ...12 AGZ 025D through 190D OMM 1166 1 Figure 2 Typical Field Control Wiring ...

Page 13: ...Selection 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 Circuit Control Logic 29 Pumpdown Procedure 31 Compressor Control 31 Condenser Fan Control 32 EXV Control 34 Liquid Line Solenoid 35 Hot Gas Bypass Solenoid 35 Alarms 35 Events 41 Clearing Alarms 43 Usi...

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 alarm diagnostics the MicroTech III chiller controller also provides the operator with a warning of limit pre alarm conditions Controller Inputs and Outputs Main Controller Table 9 Analog Inputs Descript...

Page 15: ...uit 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 Compressor 1 Compressor Off Compressor On DO2 Compressor 3 Compressor Off Compressor On DO3 Compressor 5 Compressor Off Compressor On DO4 Evaporator Water Pump 2 Pump Off Pump On DO5 Circuit 1 Hot Gas Bypass...

Page 16: ...r Coil 1 M2 M2 EXV Stepper Coil 2 Sensor Information Temperature All temperature sensors will be Daikin Applied part number 1934146 Pressure Pressure inputs will be read using 0 to 5 volt ratiometric sensors Nominal voltage range will be 0 5 to 4 5 volts Pressure on the low side will be measured using Daikin Applied part number 331764501 Pressure on the high side will be measured using Daikin Appl...

Page 17: ... 0 2 to 4 9 F min Nominal Evap Delta T 5 6 C 10 1 F 3 3 to 8 9 C 5 9 to 16 F Demand Limit 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 Primary Number of Compressors 4 4 6 Expansion Valve Type Thermal Thermal Electronic Fan VFD enable No No Yes Numb...

Page 18: ...ol Auto Auto manual EXV position See Special Setpoints page 19 0 to 100 Suction SH Target 5 56 C 10 F 4 44 to 6 67 C 8 to 12 F Max Evap Pressure 1076 KPA 156 1 PSI 979 to 1172 KPA 142 to 170 PSI Condenser Condenser Target 100 37 8 C 100 F 32 22 to 48 9 C 90 to 120 F Condenser Target 67 32 2 C 90 F 32 22 to 48 9 C 90 to 120 F Condenser Target 50 32 2 C 90 F 29 44 to 43 3 C 85 to 110 F Condenser Tar...

Page 19: ...porator Pressure Hold and Unload Available Mode Selection Range Without Glycol 669 to 793 KPA 97 to 115 PSI With Glycol 407 to 793 KPA 59 to 115 PSI Special Set Point Operations The following setpoints are not changeable unless the unit switch is off Available Modes Number of Compressors Expansion Valve Type Number of Fans Fan VFD Enable The Circuit Mode setpoints should not be changeable unless t...

Page 20: ...troller 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 valid for 10 minutes after the last key press on the unit controller Unit Functions Definitions The calculations in this section are used in unit level and circuit control logic LWT Slope LWT slope is c...

Page 21: ...rature 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 Band 2 Stage Down Temperature LWT target Control Band 2 The Start up and Shutdown temperatures are referenced from the Control Band Start Up Temperature Stage Up Temperature Start Up Delta set point S...

Page 22: ... 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 Set Point Unit Mode Cool Cool Cool w Glycol Cool Local Off Cool Ice w Glycol Cool Local On Cool Ice w Glycol Ice Network Cool Cool Ice w Glycol Cool Network Ice Cool Ice w Glycol Ice Ice w Glycol Ice Test Test Glyc...

Page 23: ... avoid 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 compressor starts while the unit is in ice mode While this timer is active the chiller cannot restart in Ice mode The time delay is adjustable via the Ice Time Delay set point The ice delay timer may be...

Page 24: ...to 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 Required A configuration change requiring a reboot has occurred but controller has not been rebooted yet Evaporator Pump Control For control of the evaporator pumps three evaporator pump control states should be used O...

Page 25: ...me 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 more than half of the flow proof set point value the primary pump will shut off and the standby pump will start Once the standby pump is started the flow loss alarm logic will apply if flow cannot be e...

Page 26: ... performed as described in this section All unit capacity limits described in following sections must be applied as described 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 LWT is higher than the Stage Up Temperature and the Stage Up Delay is not acti...

Page 27: ...f compressors running the next compressor to start will be on the circuit with the least compressors running if it has at least one compressor available to start Within that circuit the available compressor with the least starts will be next 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 ...

Page 28: ...t 75 3 75 Limit 50 2 50 Limit 1 Six compressors Network Limit Stage Limit Limit 100 6 100 Limit 83 3 5 83 3 Limit 66 7 4 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 when the unit mode is Cool If the rate exceeds this set point no more compressors ...

Page 29: ...Low 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 to start if the following conditions are true Circuit switch is closed No circuit alarms are active Circuit Mode set point is set to Enable At least one compressor is enabled to start according to e...

Page 30: ...s commanded to stop Unit State 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 Off Circuit Rapid Stop alarm is active T5 Run to Off Any of the following are required Unit State Off Circuit Rapid Stop alarm is active A low ambient start attempt failed ...

Page 31: ...shutdown Multiple Low Ambient Start attempts are allowed On 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 either a startup is successful the Low OAT Restart alarm is triggered or the unit time clock shows that a new day has started Circuit Status...

Page 32: ...cling of power to the chiller This means that if power is cycled 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 compressors are running on the circuit All running fans should turn off when the circuit goes to the off state Fan Staging Fan staging shal...

Page 33: ... one 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 active deadband a stage down error is accumulated Stage Down Error Step Target Stage Down dead band Saturated Condenser Temperature The Stage Down Error Step is added to Stage Down Accumulator once ever...

Page 34: ...ell 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 valve s maximum is allowed to return to its normal value at a rate of 0 1 every six seconds This offset to the maximum position should not occur if the stage down is due to a low pressure unload In add...

Page 35: ...larms 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 turned on If no Unit Fault Alarm is active but any Circuit Fault Alarm is active the alarm digital output should alternate five seconds on and five seconds off continuously All alarms appear in the acti...

Page 36: ... conditions no longer exist Evaporator LWT Sensor Fault Trigger Sensor shorted or open 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 Sensor shorted or open Action Taken Normal stop of all circuits Reset This alarm can be cleared manually via the keypad...

Page 37: ...he keypad or BAS command when communication between main controller and the extension module is working for 5 seconds or Expansion Valve Type Thermal Unit Problem Alarms Low Ambient Lockout No longer an alarm from version 251699201 on Trigger The OAT drops below the low ambient lockout set point AND the OAT sensor fault is not active Action Taken Normal shutdown of all circuits Reset The lockout s...

Page 38: ... reset 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 reset input back in range for 5 seconds Evaporator EWT Sensor Fault Trigger Sensor shorted or open Action Taken None Reset Auto clear when the sensor is back in range Circuit Fault Alarms PVM GFP Fau...

Page 39: ...the 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 Pressure Trigger Condenser Pressure High Condenser Pressure set point Action Taken Rapid stop circuit Reset This alarm can be cleared manually via the controller keypad Mechanical High Pressure Swi...

Page 40: ...is 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 Action Taken Normal shutdown of circuit Reset This alarm can be cleared manually via the keypad or BAS command but only if the sensor is back in range Circuit Events Low Evaporator Pressure Hold Tr...

Page 41: ... if 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 circuit condenser pressure High Condenser Pressure Unload set point Action Taken Stage off one compressor on the circuit every 10 seconds while condenser pressure is higher than the unload set poin...

Page 42: ...aporator 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 on the circuit On units equipped with 6 compressors electronic expansion valves and 10 or more fans when each compressors starts there should be a 2 minute window during which the evaporator pressur...

Page 43: ...rm log 3 Event Log An Event Log similar to the Alarm Log stores the last 50 event occurrences Each Event Log entry includes an event description and a time and date stamp for the event occurrence plus the count of the event occurrences on the current day and for each of the last seven days Events do not appear in the Active Alarm list Clearing Alarms Active alarms can be cleared through the keypad...

Page 44: ...ains 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 and the line number to which the cursor is currently pointing in the above case 3 Temperature The left most position of the title line includes an up arrow to indicate there are lines parameters abov...

Page 45: ...ch 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 Passwords Enter passwords from the Main Menu Enter Password links to the Entry screen which is an editable screen So pressing the wheel goes to the edit mode where the password 5321 can be entered The firs...

Page 46: ...g the wheel again cause the new value to be saved and the keypad display to leave the edit mode and 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 providing the proper password has been entered Example 1 Check Status for example is the unit being cont...

Page 47: ...screen the linked screen is indicated in the rightmost column Example the Enter Password screen links to screen U 2 For each screen the screen 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 parameters there is a link to a screen that shows the values for a...

Page 48: ...13 Set Up R U 14 Temperatures R U 15 Date Time Schedules R U 16 Power Conservation 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 Calibrate Sensors U 27 Settings Change History U 28 Menu Password R U 29 Screen U 5 From Screen U 1 View Set Circuit No pa...

Page 49: ...Service Support Reference R R Screen U 9 From Screen U 1 Review Operation No password 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 Manual Control No password Operator Links to screen Unit U 34 Circuit 1 Cx 3 Circuit 2 Cx 3 Screen U 11 From Screen U 1 C...

Page 50: ...rsion R R Application Version R R HMI GUID 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 Enable Setpoint Network R Chiller Mode Setpoint Network R Cool Setpoint Network R Capacity Limit Setpoint Network R Stage Up Delay Remaining R Stage Down Delay ...

Page 51: ...Delta 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 Setpoint 2 R W Ice LWT Setpoint R W Screen U 16 From Screen U 4 U 11 Date Time Schedules No password Operator Links to screen Actual Time R W Actual Date R W UTC Difference R W DLS Enable R W DLS Start M...

Page 52: ...ask 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 Operator Links to screen Apply Changes R W Name R W Dev Instance R W MSTP Address R W Baud Rate R W Max Master R W Max Info Frm R W Unit Support R W Term Resistor R W NC Dev 1 R W NC Dev 2 R W BACnet BSP ...

Page 53: ...assword 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 Screen U 24 From Screen U 4 U 11 Ctrlr IP Setup No password Operator Links to screen Apply Changes R W DHCP R W Actual IP Address R Actual Mask R Actual Gateway R Given IP Address R W Given Mask R W Give...

Page 54: ...Setpoint High Pressure Shutdown 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 password Operator Links to screen Evap Leaving Water Temp Evap LWT Offset Evap Entering Water Temp Evap EWT Offset Outside Air Temp OAT Offset Screen U 28 From Screen U 4 Settings Change History No password Oper...

Page 55: ...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 Water Temp Active Set Point Pulldown Rate Outside Air Temperature Screen U 34 From Screen U 10 U 11 Unit Manual Control No password Operator Links to screen Test Unit Alarm Out Test Evap Pump 1 Out Test Evap P...

Page 56: ...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 Screen U 38 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 Screen Cx 1 From Screen U 5 View Set Cirx No password Operator Links t...

Page 57: ...ompressor 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 Stop Condenser Number of Fans Running Stage Up Error Stage Down Error Condenser Target VFD Target VFD Speed EXV EXV State EXV Position Superheat Target Suction Superheat EXV Control Mode Screen Cx 3 From Screen U 10 U 11...

Page 58: ...or 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 Screen Cx 4 From Screen Cx 1 Data No password Operator Links to screen Evaporator Pressure Condenser Pressure Saturated Evap Temperature Saturated Cond Temperature Suction Temperature Suction Superheat Evapora...

Page 59: ...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 Control Mode EXV Position Evaporator Pressure Max Evaporator Pressure Screen Cx 8 From Screen Cx 1 U 35 Calibrate Sensors No password Operator Links to screen Evaporator Pressure Evap Pressure Offset Condenser Pres...

Page 60: ... 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 personnel injury be sure to verify direction of rotation before attempting full speed operation For safety to personnel the motor chassis ground must be connected to the ground connection at the bottom of th...

Page 61: ...s 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 display the next item select parameter numbers and increment setting values 6 Down Arrow Key Scrolls down to display the next item select parameter numbers and increment setting values 7 STOP Key St...

Page 62: ...d to the MEMOBUS Modbus CommunicationInputs of the drive OP Displayed when the frequency reference is assigned to an Option Unit of the drive RP Displayed when the frequency reference is assigned to the Pulse Train Input of the drive 7 LO RE Display 2 RSEQ Displayed when the run command is supplied from a remote source LSEQ Displayed when the run command is supplied from the operator keypad RREF D...

Page 63: ...han 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 set to LOCAL a Run command was entered to the input terminals then the drive was switched to REMOTE A Run command was entered via the input terminals while the drive was not in the Drive Mode Durin...

Page 64: ...ti function contact outputs do not operate 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 Tuning errors occur while performing Auto Tuning When the drive detects a tuning error The digital operator displays text indicating the specific error Multi function contact outputs do not operate Motor...

Page 65: ...ontactors and relays for excessive noise Check for over or undervoltage Inspect for signs of overheating such as melted or cracked insulation Replace damaged parts Optional BAS Interface The AGZ chiller controller is configured for stand alone operation or integration with BAS through an optional communication module The following installation manuals for optional BAS interface modules are shipped...

Page 66: ...ontrol 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 Put system switch S1 to ON position Switch Switch Position ON OFF PS1 PS2 Pumpdown Switches Circuits will operate in the normal automatic mode Circuit will go through the normal pumpdown cycle and shut o...

Page 67: ...all water strainers before placing 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 installed 2 Check that all refrigerant valves are either opened or closed as required for proper operation of the chiller 3 A thorough leak test must be done using an approved el...

Page 68: ... air handler load Note The hot gas bypass valve cannot generate a 100 false load The pressure regulating valves are a Sporlan HGBE 8 75 150 7 8 ODF on models AGZ 025 to 065 and Sporlan 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 raise the pressure set...

Page 69: ...green Warning LED one time indicating the module has not communicated with the master controller for longer than 5 minutes Code 2 Reserved For Future Use Code 3 Short Cycling The module will flash the green Warning LED three times indicating the compressor has short cycled more than 48 times in 24 hours Code 4 Open Shorted Scroll Thermistor The module will flash the green Warning LED four times in...

Page 70: ...NOTE If a compressor with CoreSense Communications fails in the field the CoreSense module should remain with the failed compressor so the manufacturer s technicians can download the CoreSense data to assist with determining the root cause of compressor failure Filter Driers Each refrigerant circuit is furnished with a full flow filter drier AGZ 030D 100D or a replaceable core type filter drier AG...

Page 71: ...ff cycle Power must be supplied to the heaters 8 hours before starting the compressors Evaporator Models AGZ 025D through 130D The evaporator is a compact high efficiency dual circuit brazed plate to plate type heat exchanger consisting of parallel stainless steel plates The evaporator is protected with an electric resistance heater and insulated with 3 4 19mm thick closed cell polyurethane insula...

Page 72: ...48 kPa Each evaporator is designed constructed inspected and stamped according to the requirements of the ASME Boiler and Pressure Vessel Code Double thickness insulation is available as an option Phase Voltage Monitor Optional Factory settings are as follows Trip Delay Time 2 seconds Voltage Setting set at nameplate voltage Restart Delay Time 60 seconds ...

Page 73: ...covery can be required strictly following Clean Air Act regulations governing refrigerant discharge to the atmosphere The Schrader purge valve is located on the vertical coil headers on both sides of the unit at the end opposite the control box Decorative panels cover the condenser coils and must be removed for servicing Recover with the unit off after a shutdown of 15 minutes or longer to allow a...

Page 74: ...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 Note 3 X Visually inspect unit for loose or damaged components X Inspect thermal insulation for integrity X Clean and paint as required X Electrical Check terminals for tightness tighten as necessary X ...

Page 75: ...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 recovery cylinders or overcharge units Check gauge calibration before every use and manifold set for leaks regularly Be aware of pneumatic and possible hydrostatic pressure potentials Never pressurize systems with oxygen or ref air mix R 410A R 407C R 13...

Page 76: ...n with approximately 15 of the coil tubes located in a subcooler section of the coil to achieve liquid cooling to within 5 F 3 C of the outdoor air temperature when all condenser fans are operating Once the subcooler is filled extra charge will not lower the liquid temperature and does not help system capacity or efficiency If a unit is low on refrigerant you must first determine the cause before ...

Page 77: ...elief is 600 650 psid Brazed connections only No StayBrite or solder connections solder should never be used with any refrigerant K or L type refrigeration tubing only Use nitrogen purge Higher R 410A pressures and smaller molecule size make workmanship more critical R 410A must be charged from cylinder as a liquid unless entire cylinder is used Use a Refrigerant flow restrictor if charging liquid...

Page 78: ... in the event of a power failure do not normally require any maintenance The solenoids can however require replacement of the solenoid coil or of the entire valve assembly The solenoid coil can be checked to see that the stem is magnetized when energized by touching a screwdriver to the top of the stem If there is no magnetization either the coil is bad or there is no power to the coil The solenoi...

Page 79: ...r recirculation 6 Clean coil 7 Correct Low Discharge Pressure 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 regulation 3 Check condenser control operation 4 Insufficient refrigerant in system 5 Low suction pressure 4 Check for leaks Repair and add charge 5 See corrective steps for L...

Page 80: ... superheat 3 Crankcase heater burnout 3 Replace crankcase heater Motor Overload Relays or Circuit Breakers Open 1 Low voltage during high load conditions 1 Check supply voltage for excessive line drop 2 Defective or grounded wiring in motor 2 Replace compressor motor 3 Loose power wiring or burnt contactors 4 High condenser temperature 5 Power line fault causing unbalanced voltage 3 Check all conn...

Page 81: ......

Page 82: ......

Page 83: ......

Page 84: ...ikin Applied equipment is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local Daikin Applied sales representative for warranty details To find your local Daikin Applied representative go to www DaikinApplied com Aftermarket Services To find your local parts office visit www DaikinApplied com or call 800 37PARTS 800 377 2787 To find your ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands