Daikin EWWQ-AJYNN Service Manual Download Page 57

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ESIE07-05

Functional Control

Part 2 – Functional Description

2–51

Compressors
unload and
shutdown
management (4
compressors)

16a (T in unload
band)

Fixed at 75%

Unload up to 50%

Start

16b (T out unload
band)

Fixed at 75%

Start

Fixed at 75%

Fixed at 75% or
50%

Load up to 50%

18 (if lag 2 at 50%)

Fixed at 75%

Load up to 75%

Fixed at 50%

Fixed at 75%

Load up to 75%

Load up to 100%

Fix a/Fixed at 75%

Fixed at 100%

Fixed at 75%

Fixed at 100%

Load up to 100%

Fixed at 75%

Fixed at 100%

Load up to 100%

Fixed at 100%

Step n.

Leader Comp.

Lag 1 Comp.

Lag 2 Comp.

Lag 3 Comp.

Step n.

Leader Comp.

Lag 1 Comp.

Lag 2 Comp.

Lag 3 Comp.

100%

Fixed at 100%

Unload up to 75%

Fixed at 100%

Unload up to 75%

Fixed at 75%

Fixed at 100%

Unload up to 75%

Fixed at 75%

Unload up to 75%

Fixed at 75%

Unload up to 50%

Fixed at 75%

Unload up to 50%

Fixed at 50%

Fixed at 75%

Fixed at 50%

Unload up to 25%

If T is approaching SetP – Waiting

8a (T in load band)

Fixed at 75%

Load up to 75%

Stop

8b (T not in load
band)

Fixed at 75%

Fixed at 50%

Stop

9 (if lag 2 at 75%)

Fixed at 75%

Off

Fixed at 75%

Unload up to 50%

Fixed at 50%

Off

Fixed at 75%

Fixed at 50%

Fixed at 25%

Off

If T is approaching SetP – Waiting

13a (T in load
band)

Fixed at 75%

Load up to 75%

Stop

Off

13b (T not in load
band)

Fixed at 75%

Fixed at 50%

Stop

Off

14 (lag 1 at 75%)

Fixed at 75%

Unload up to 50%

Off

Unload up to 50%

Fixed at 50%

Off

Fixed at 50%

Unload up to 25%

Off

If T is approaching SetP – Waiting

ESIE07-05.book Page 51 Friday, December 21, 2007 3:21 PM

Summary of Contents for EWWQ-AJYNN

Page 1: ...ESIE07 05 Service Manual EWWQ AJYNN Water cooled screw chillers ESIE07 05 book Page 1 Friday December 21 2007 3 21 PM...

Page 2: ...draft Not all information on this chiller is already present in this service manual However together with the installation operation manual and the databook this manual should provide you with enough...

Page 3: ...ESIE07 05 book Page 2 Friday December 21 2007 3 21 PM...

Page 4: ...nloading the unit to be sure that it agrees with the power supply available Physical damage to unit after acceptance is not Daikin s responsibility Responsibilities Daikin declines all present and fut...

Page 5: ...StarGateTM Frame 4 single screw compressors They are manufactured by Daikin to satisfy the requirements of the consultants and the end user Daikin EWWQ_AJYNN units are designed to minimise energy cos...

Page 6: ...ectricity supply No operation on electrical components is allowed without using insulated platforms no water or moisture should be present All the operation on refrigerant circuit and pressurised comp...

Page 7: ...to avoid straining the piping and transmitting vibration and noise Compressor condensation Condensation occurs on the compressor surface when the temperature of the compressor surface is lower than th...

Page 8: ...w 4 C leaving evaporator fluid temperature The maximum allowable water temperature to the cooler in a non operating cycle is 40 C The non operating leaving condenser water temperature maximum is 46 C...

Page 9: ...em the system should be thoroughly flushed prior to unit installation and then regular chilled water analysis and chemical water treatment is recommended immediately at equipment start up 10 In the ev...

Page 10: ...ith gasket for an easy and quick water connection Hour run meter Digital compressors hour run meter General fault contactor Contactor for the alarm warning Brine double set point version Dual leaving...

Page 11: ...power factor correction OPPF Installed on the electrical control panel to ensure it conforms to the plant rules DAIKIN advises maximum 0 9 Suction line shut off valve OP12 Suction shut off valve insta...

Page 12: ...round information for troubleshooting An extensive overview of the functioning of the controller is also given in this part Knowledge of the controller is essential to gather information prior to serv...

Page 13: ...ESIE07 05 2 2 Part 2 Functional Description 3 1 2 5 ESIE07 05 book Page 2 Friday December 21 2007 3 21 PM...

Page 14: ...roller and the software Understanding these functions is vital when diagnosing a malfunction which is related to system architecture or software Overview This chapter contains the following topics Top...

Page 15: ...on the unit and will take corrective action if the chiller is operating of it s normal design conditions If a fault condition develops the controller will shut the system down and activate an alarm o...

Page 16: ...t any problem also with high temperature evaporator water SoftLoad feature reduces electrical consumption and peak demand charges during loop pulldown Unit Limiting feature allows to limit electrical...

Page 17: ...This chapter contains the following topics Topic See page 1 4 1 Control Panel 2 7 1 4 2 Main Board 2 8 1 4 3 EEXV Valve Driver 2 10 1 4 4 Meaning of the Driver EEXV Status LEDs 2 12 1 4 5 Addressing o...

Page 18: ...he Control Panel is constituted by the backlight display 4 line by 20 character and by the 15 key keypad In this chapter we will described this functions Frontal and back view Backlight Display Keys T...

Page 19: ...Vac 4 Universal analog inputs NTC 0 1V 0 10V 0 20mA 4 20mA 5 Passive analog inputs NTC PT1000 On off 6 Analog outputs 0 10V 7 24Vac Vdc Digital inputs 8 230Vac or 24Vac Vdc Digital inputs 9 Synoptic t...

Page 20: ...ESIE07 05 The Digital Controller Part 2 Functional Description 2 9 3 2 4 5 1 pLAN addressing microswitches ON OFF R G V ESIE07 05 book Page 9 Friday December 21 2007 3 21 PM...

Page 21: ...oduction The valve drivers contain the software for the control of the electronic expansion valve and are connected to the battery group which provide to close valve in case of power failure Driver In...

Page 22: ...ESIE07 05 The Digital Controller Part 2 Functional Description 2 11 3 2 4 5 1 Battery assembly Battery charger Chargeable Battery 10 Amp Fuse ESIE07 05 book Page 11 Friday December 21 2007 3 21 PM...

Page 23: ...he LED s will identify the alarm as shown below In case more than one alarm is present the alarm with the highest priority will be visualized Highest priority is level 7 Alarms that stop the system PR...

Page 24: ...pecified in the table below pLAN component Microswitches 1 2 3 4 5 6 Local DISPLAY OFF OFF OFF OFF ON OFF Remote DISPLAY if available ON OFF OFF OFF ON OFF COMP BOARD 1 ON OFF OFF OFF OFF OFF COMP BOA...

Page 25: ...to the operational conditions of the unit and to the functions of program The information requested are shown on the backlight Display 4 lines for 20 characters Control panel Keypad keys and their fun...

Page 26: ...ons It allows to visualize the main menu It allows the passage from one board to the other visualizing parameters of corresponding compressors It allows the changeover between chiller to heat pump onl...

Page 27: ...mains valid for 10 minutes since last access It enables the set values Category Description Keys Password Main Unit operating parameters view only NO User User parameter setting 0003 Setting Setpoint...

Page 28: ...wing topics Topic See page 1 5 1 Main Menu 2 23 1 5 2 User Menu 2 26 1 5 3 Setting Menu 2 30 1 5 4 Input Output Menu I O Menu 2 31 1 5 5 Manufacturer Menu 2 33 1 5 6 Maintenance Menu 2 38 1 5 7 Servic...

Page 29: ...mm unit Off by remote communication supervisor or BMS Off Time Schedule unit Off by time schedule Off Loc Remote Sw unit Off through switch Off Keypad unit Off through keypad key on off Off Amb LockOu...

Page 30: ...ter Temperatures LVG Rec xxx C Possible status Off Alarm Compressor OFF for alarm Off Switch Compressor OFF by local switch Off Ready Compressor OFF ready to start Oil Heating Compressor waiting for o...

Page 31: ...unctional Description 2 25 3 2 4 5 1 Compressor status This screen shows the Compressor status off standby load download Staging Staging Staging Compressor UP Down Fixed Off or or or or ESIE07 05 book...

Page 32: ...porator leaving water 4 0 10 0 C Cooling setpoint 4 20mA Override Limits if enabled for condenser outlet water only in heat pump or pursuit mode 40 0 50 0 C Return Temperature evaporator leaving water...

Page 33: ...Max Time N 50 20 min Limits for high chilled water start Evaporator leaving temperature Max Unit Load 25 70 C Item description Default U m Neutral Regul Max Pull Down Rate band band C C xx x xx x C mi...

Page 34: ...t Remote on off Supervisory Remote On Off Autorestart after power failure enabling Item description Default U m En Ambient N Y Lockout Unit Limiting NONE Superv Demand Currnent Limit Demand Limit Time...

Page 35: ...g time for sunday 18 days for forced off Insert another password Item description Default U m Switch Off unit on External Alarm Y N Enable Time Scheduling Y N Start Stop Mon Fri Sat Sun xx xx xx xx xx...

Page 36: ...the Cooling Setpoint C Active setpoint These screens show the Active setpoint if the DOUBLE SETPOINT function is enabled or RESET SETPOINT or AMBIENT COMPENSATION Cooling setpoint Heating setpoint C...

Page 37: ...e Inlet and outlet water temp ambient temperature Compressor discharge temperature and load This screen shows the Compressor discharge temperature and load Condensing and oil pressure This screen show...

Page 38: ...ad Status This screen shows Modem Status Controller Bios and Boot version and date SoftLoad Status EXV Firmware version This screen shows the EXV Firmware version Bios Version xxx x xx xx xx xxx x xx...

Page 39: ...s or value Overview Unit Configuration 00 Air cooled Chiller 01 Water Water Heat Pump 02 Water Water Pursuit Chiller 03 Water cooled Chiller Probe enable Master Board B1 B2 B4 B6 B7 B8 Probe enable Sl...

Page 40: ...180 s Interstage Timer Double load unload pulse for compressor load under 210 sec 35 Compressor unloading pulse time PULSE TIME 0 3 s MIN PULSE PERIOD 1 s MAX PULSE PERIOD 10 s Compressors config 1 N...

Page 41: ...bar Low pressure stage down 1 2 bar Antifreeze prevent Setpoint Diff 3 5 C 1 0 C Condensation enable mode NONE Enable oil temperature control Y Compressor Loading Min pulse period Max pulse period Pul...

Page 42: ...pressure alarm setpoint SETPOINT 01 0 bar DIFFERENTIAL 00 5 bar Delay low pressure alarm STARTUP DELAY 120 s OPERATING DELAY 60 s Ratio alarm setpoint Min Load Max Load 1 4 1 8 Delay pressure Ratio a...

Page 43: ...IAL 10 0 C Evaporator heater SETPOINT 3 0 C DIFFERENTIAL 1 0 C Supervisor configuration PROTOCOL CAREL COMMUNICATION SPEED 19200 IDENTIFICATION NUMBER 001 Default parameter NO Modem connection passwor...

Page 44: ...or starts These screens show the Workingtime and number of compressor starts This screens show the PID control status only master These screens show the PID control status only master Hour counter Pum...

Page 45: ...ction of compressor starts Correction of evaporator pump condenser pump and run hours These screens show the Correction of evaporator pump condenser pump and run hours EXV Driver State Batt Resist Bat...

Page 46: ...mpressor This screen shows the Time download compressor Minimum evaporator T This screen shows the Minimum evaporator T DT to reload compressor This screen shows the T to reload compressor Comp Min lo...

Page 47: ...listed below Compressor control and compressor load in manual mode This screen shows the Compressor control OFF AUTO MANUAL and compressor load in manual mode Alarms reset This screen shows the Alarm...

Page 48: ...stops the buzzer while pressing it thrice removes the alarm Remark Sometimes when an alarm occurs another spurious alarm of star delta transition failure also occurs In this case solve the spurious al...

Page 49: ...e enter key when an alarm description is displayed shows the operating conditions at the time the alarm occurred temperatures pressures expansion valve status and compressor load Screens DD MM YY Phas...

Page 50: ...essure pressure switch 1 Circuit 1 man no AL13 High pressure pressure switch 2 Circuit 2 man no AL14 Oil differential pressure switch 1 Circuit 1 man selectable AL15 Oil differential pressure switch 2...

Page 51: ...p man AL68 Driver1 wait for valve reopening man AL69 Driver1 wait for battery recharge man AL70 Driver1 wait for eeprom restart man Code Alarm description Compressor off Fan off Pump off System off Re...

Page 52: ...The Digital Controller ESIE07 05 2 46 Part 2 Functional Description 3 1 2 4 5 ESIE07 05 book Page 46 Friday December 21 2007 3 21 PM...

Page 53: ...point Reset of the Chilled Water 2 54 2 5 Return Water Reset 2 56 2 6 Freeze up Control 2 57 2 7 Enable Soft Load 2 59 2 8 Unit Load Limiting 2 60 2 9 Start Up With High Evaporator Water Temperature 2...

Page 54: ...ay Off Loc Rem Sw will appear If the switch is in Loc position the unit is on unless there are other shutdown conditions If the switch is in the Rem position the digital contact control allows the sta...

Page 55: ...STANDBY PID requires UNLOAD Compressor stop required No new compressor required Compressors loading No compressor stop required Compressors Unloading Compressor complete unloading max 30 s Expansion...

Page 56: ...rstage time 5 If T is approaching SetP Waiting 6a T in unload band Unload up to 50 Start Off Off 6b T not in unload band Fixed at 75 Start Off Off 6 Fixed at 75 or 50 Load up to 50 Off Off 7 If leader...

Page 57: ...1 Fixed at 100 Fixed at 100 Fixed at 100 Unload up to 75 2 Fixed at 100 Fixed at 100 Unload up to 75 Fixed at 75 3 Fixed at 100 Unload up to 75 Fixed at 75 Fixed at 75 4 Unload up to 75 Fixed at 75 F...

Page 58: ...ad band Fixed at 50 Stop Off Off 19 Unload up to 25 Off Off Off 20 If T is approaching SetP Waiting 21 If SetP T Shutdown DT Cooling or T SetP Shutdown DT Heating Waiting 22 Stop Off Off Off 23 Off Of...

Page 59: ...ading band 4a No Unit will add next compressor 25 capacity and keep the leader compressor at 75 Leader comp 75 Next comp 25 4b Yes Unit will first unload leader compressor to 50 when this is done the...

Page 60: ...en the temperatures of evaporator outgoing water are inferior to 4 C the introduction of the correct quantity of Anti freeze in the hydraulic system is required External signal The setpoint override a...

Page 61: ...05 Functional Control Part 2 Functional Description 2 55 3 2 4 5 1 Lvg Water Temp Setpoint Reset 4 20mA chLWT Setpoint Override Limits Setp Diff 03 0 C ESIE07 05 book Page 55 Friday December 21 2007 3...

Page 62: ...ng water setpoint is never set to a value greater than the return water setpoint and is never set to a value less than the actual leaving chilled water setpoint Function description Remark When the un...

Page 63: ...reeze protection is activated and the unit will shutdown When the temperature rises above the Anti freeze setpoint diff 3 C it is possible to reset the Anti freeze alarm Remark In case of 2 evaporator...

Page 64: ...e Prevention Setpoint Outlet Temp Time possible for the compressor to upload possible to reset Anti freeze Alarm Freeze up prevention load down Anti freeze Alarm shutdown Anti Freeze Alarm Setpoint Di...

Page 65: ...nit load to a predetermined value Max stage for a set period Max time This function finds wide application where the water temperature is high at the start up but without having a consistent thermal l...

Page 66: ...Demand Limit requires a 40mA 20mA external signal connections 37 and 38 on M3 The unit max load decreases from 100 to 0 as the input increases from 4mA to 20mA The second way called Current Limit need...

Page 67: ...ture is below the set value default 25 C This function helps the start up of the unit when the water temperature is very high 35 C 40 C avoiding dangerous overheating of the motor and disagreeable int...

Page 68: ...the unit is switched on the pump will run for 30 seconds before the chiller compressors can start During this 30 seconds pump lead time you also need a closed flow switch for 20 seconds Pump lag time...

Page 69: ...art after a power failure When the Auto restart is enabled the unit will automatically restart after the power failure When the Auto restart is disabled the unit will not automatically restart after t...

Page 70: ...he oil temperature PT1000 del temp is higher than 85 C default the liquid injection will be activated When the oil temperature decreases to 75 C the liquid injection will be disabled Liq Inj OFF Liq I...

Page 71: ...on description Because the unit stops with a pump down it will restart with a pre purge opening closing of the expansion valve At start up the valve will open up to 50 and close to the evaporator with...

Page 72: ...n This controller screen will allow you to modify the number of compressors and evaporators on the unit The selection of the compressors and evaporators has to be done according to the unit Compressor...

Page 73: ...r sequence will be done by the controller depending on the running hours Manual The selection of the compressor sequence is fixed according to the entered sequence When manual is selected the followin...

Page 74: ...2 4 5 Function description Comp 1 ON Min time comp ON Min time comp OFF Min time between same comp start Comp 1 OFF Comp 1 ON Comp 1 OFF Comp 1 ON Min time between diff comp starts Comp 1 OFF Comp 2 O...

Page 75: ...ure alarm Function description Hold capacity area if the HP is above the P hold cond setpoint default 17 5 bar the compressor will hold the same capacity no load up possible Load down area if the HP i...

Page 76: ...scription hold capacity area if the LP is below the P hold evap setpoint default 1 9 bar the compressor will hold same capacity no load up possible load down area if the LP is below the P down evap se...

Page 77: ...the sliding vane is done by oil pressure The controller will decide to feed or to drain oil from the capacity control piston compartment in order to load or download When the unload valve B is energiz...

Page 78: ...d with a frequency related to the set point distance upload download pulses Fixed Variable Compressor Unloading Pulse Time Min Pulse Period Max Pulse Period 00 3 s 01 s 90 s Compressor Loading Pulse T...

Page 79: ...erently whenever the water temperature changes If the derivative time is increased the control will be more sensitive to temperature changes For example the derivative time can be increased when a chi...

Page 80: ...thermostat the pump down procedure will be executed Function description Pump down procedure request to shut down compressor close electronic expansion valve stop compressor or when one of the two con...

Page 81: ...above the HP setpoint the unit will go into HP alarm When the high pressure alarm is activated and the HP sinks below HP setpoint diff it is possible to reset the transducer high pressure alarm When t...

Page 82: ...hen the low pressure alarm is activated and the LP rises above the LP setpoint diff it will be possible to reset the transducer low pressure alarm When the low pressure sinks below the low pressure sw...

Page 83: ...t start up the unit has a delay of 120 seconds before the unit can trip on LP alarm low pressure bypass timer run delay When the unit is in operation the low pressure can be below the LP alarm setpoin...

Page 84: ...arm When the unit is at 25 capacity the unit will go into alarm when the pressure ratio is below 1 4 for a specified time When the unit is at 100 capacity the unit will go into alarm when the pressure...

Page 85: ...the setpoint for a specified time before the unit will trip on pressure ratio alarm 2 22 3 High Oil DP Alarm Function description When the pressure drop across the oil filter becomes too big higher th...

Page 86: ...Functional Control ESIE07 05 2 80 Part 2 Functional Description 3 1 2 4 5 ESIE07 05 book Page 80 Friday December 21 2007 3 21 PM...

Page 87: ...urthermore the general procedures for refrigeration circuit repair and for electrical circuit repair are explained Remark Not all repair procedures are described Some procedures are considered common...

Page 88: ...ESIE07 05 3 2 Part 3 Troubleshooting 3 1 3 5 ESIE07 05 book Page 2 Friday December 21 2007 3 21 PM...

Page 89: ...This Chapter Overview This chapter contains the following topics Topic See page 1 2 Copy from the Software Key to pCO 3 4 1 3 Copy from pCO to the Software Key 3 5 1 4 Installation of Winload32 on the...

Page 90: ...ously the buttons UP an DOWN then supply power to the pCO2 Check the LED on the key is on red color Wait until the request of copying appears on the LCD display then release the buttons and confirm by...

Page 91: ...ying appears on the LCD display then release the buttons and confirm by pressing ENTER If the application includes a password to protect the software use the UP and DOWN buttons on the terminal to ent...

Page 92: ...PC and Programming a Controller Step Action 1 2 Create 2 folders 1 Carel to place progam winload in this folder 2 Carel_upload to place software program files in this folder 1 2 1 Go to the Daikin Ex...

Page 93: ...05 Procedure for Software Upload Download Part 3 Troubleshooting 3 7 3 3 4 5 1 3 4 Step Action Select Chiller PCO page 1 Go to the WinLoad32 program page ESIE07 05 book Page 7 Friday December 21 2007...

Page 94: ...Step Action 1 Click on winload32 to download the file 2 file download screen will appear 3 Click on save Download the file to your hard disk 1 Browse to the place were you want to save the file Examp...

Page 95: ...Troubleshooting 3 9 3 3 4 5 1 7 8 Step Action The file Winload32 v3 30 is now saved on the hard disk of your PC 1 Double click on the file Winzip will open 1 Select winload32 exe 2 Press on extract 1...

Page 96: ...Action 1 Browse to the Carel folder 2 Press Extract 1 Do the same see previous screens for the Carel drivers 2 Save the carel drivers in the Carel folder on your PC 3 Follow the PDF instruction file...

Page 97: ...oubleshooting 3 11 3 3 4 5 1 11 12 Step Action 1 Go back to the PCO software download page on the extranet 2 Click on the model name Select save to download the file to your PC Click to download the f...

Page 98: ...ion 1 Open the saved zip file 2 Select the file for the unit capacity 3 Press extract 4 Choose a location where you want to save the file example C drive 5 Click extract The file is now save on the ha...

Page 99: ...lect the files If you have a 2Mb controller you can upload all languages iup files If you have a 1Mb controller only 2 languages can be uploaded only extract 2 languages iup files to the upload folder...

Page 100: ...placed into this only program files If you copy the files from a CD to this folder then the property of this files is read only disable read only Select all files Right click and select properties Dis...

Page 101: ...3 4 5 1 19 20 Step Action 1 Go to the shortcut shortcut to winload32 2 Select properties 1 2 1 Go to target and type C Carel WinLoad32 exe C carel_upload EASY_BOOT don t forget the place spaces 2 Pres...

Page 102: ...Open Winload32 1 2 1 Go to the tab Application 2 Open the Carel_upload folder to activate 3 If OK you will see the files that are in the Carel_upload folder 5 Enter same address as on the pCO2 contro...

Page 103: ...tab Bios 2 Open the Carel_upload folder to activate 3 If OK you will see the BIOS file that is in the Carel_upload folder 1 2 3 1 Go to the tab Boot 2 Open the Carel_upload folder to activate 3 If OK...

Page 104: ...tab Public Variables 2 Open the Carel_upload folder to activate 1 2 1 Go to the tab LogProject 2 Open the Carel_upload folder to activate This is the folder where you can find the program report to ch...

Page 105: ...s now waiting for the controller 3 When you see this screen you can now put power supply to the controller 4 The program will now upload all files automatically into the controller 1 Program is busy t...

Page 106: ...or Software Upload Download ESIE07 05 3 20 Part 3 Troubleshooting 3 1 3 4 5 29 Step Action Please check that you have 4 times UPLOAD COMPLETED SUCCESSFULLY ESIE07 05 book Page 20 Friday December 21 20...

Page 107: ...y on page 3 5 Fig 1 Set the key selector on from key to pCO2 Insert the key in the corresponding pin connector as shown see Copy from pCO to the Software Key on page 3 5 Fig 2 Prepare the connection f...

Page 108: ...Procedure for Software Upload Download ESIE07 05 3 22 Part 3 Troubleshooting 3 1 3 4 5 ESIE07 05 book Page 22 Friday December 21 2007 3 21 PM...

Page 109: ...3 Troubleshooting 3 23 3 3 4 5 1 Part 3 2 pLAN Setting 2 1 What Is in This Chapter Overview This chapter contains the following topics Topic See page 2 2 pLAN Setting 3 24 ESIE07 05 book Page 23 Frid...

Page 110: ...second terminal remote terminal change the line Trm2 None into Tmr2 17 sh To enable the new configuration put the pointer on No using the ENTER button and change it into Yes using the UP and DOWN butt...

Page 111: ...rvice engineering This part contains a systematic approach on test run checks and test values which guarantees a high quality installation and operation of the units What is in this part This part con...

Page 112: ...ESIE07 05 4 2 Part 4 Commissioning and Test Run 3 1 4 5 ESIE07 05 book Page 2 Friday December 21 2007 3 21 PM...

Page 113: ...nce should be set up for operation at maximum capacity or to avoid damage The following chapters explain how to or when to maintain the units What is in this part This part contains the following chap...

Page 114: ...ESIE07 05 5 2 Part 5 Maintenance 3 1 5 ESIE07 05 book Page 2 Friday December 21 2007 3 21 PM...

Page 115: ...n Avoid high gas concentrations While the heavy concentration of the refrigerant gas will remain on the floor level good ventilation is a must Avoid all contact with open fires or hot surfaces By high...

Page 116: ...d upper parts of the screw rotor at the same time thus cancelling the radial loads Also both ends of the screw rotor are subjected to suction pressure only which cancels the axial loads and eliminates...

Page 117: ...for operation When three phase power has been applied the output relay should close and the run light should come on If the output relay does not close perform the following tests 1 Check the voltage...

Page 118: ...e heater before doing any servicing inside Prior to attempting any service on the control centre it is advisable to study the wiring diagram so that you understand the operation system of the water ch...

Page 119: ...id line manual shutoff valve to remove non condensables that may have entered during filter replacement Open the suction line valve A leak check is recommended before returning the unit to operation E...

Page 120: ...established the oil differential pressure switch is brought into the safety trip circuit Oil is now being supplied to the compressor under the action of the system pressure differential monitored by...

Page 121: ...eading and recording of supply voltage x 4 Reading and recording of current intensity x 5 Check refrigerant charge and possible moisture in the circuit refrigerant through the liquid sight glass x 6 C...

Page 122: ...ccant in both the liquid and suction lines Excessive refrigerant losses can also leak oil from the system Check the separator oil level during operation and ensure that oil is visible in the top sight...

Page 123: ...intenance 6 19 3 5 1 6 Part 6 2 Appendix B 2 1 What Is in This Chapter Overview This chapter covers the following topics Topic See page 2 2 General Chiller Start up Guide 5 20 ESIE07 05 book Page 19 F...

Page 124: ...tioning of the Carel controller Make any required changes to default settings Make a written record of all set up parameters Using calibrated gauges and thermometer check the calibration of all pressu...

Page 125: ...terminals and correctly glanded in the electrical panel entry plate Opening the power and control sections of the panel make a visual inspection for damage or omissions Check the tightness of all acc...

Page 126: ...sion valve operation condenser water temperature control plus any other optional devices Check the operation of all safety devices either by adjusting the operating conditions to cause an alarm or by...

Page 127: ...iguration at compressor stop k 2 74 return water reset k 2 56 setpoint reset of the chilled water k 2 54 start up with high evaporator water temperature k 2 61 thermostat control k 2 49 unit load limi...

Page 128: ...ecifications EWWQ AJYNN k 1 6 evaporator pressure drop EWWQ AJYNN k 5 9 F fouling and correction factors condenser k 1 8 evaporator k 1 8 functional diagram refrigeration circuit EWWQ AJYYNN k 1 20 G...

Page 129: ...reatment k i v K keypad functions k 2 19 keys k 2 19 M maintenance preventive maintenance schedule k 5 9 system maintenance k 5 6 N nomenclature k i x O oil management safeties high oil DP alarm k 2 7...

Page 130: ...r different distances k 5 5 EWWQ AJYNN k 5 4 standard accessories k i viii standard controls k 5 5 standard ratings EWWQ AJYNN k 5 6 EWWQ AJYNN k 5 7 EWWQ AJYNN k 5 8 system maintenance compressor mai...

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