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The Digital Controller

ESIE07-05

2–34

Part 2 – Functional Description

3

1

2

4

5

Compressor configuration

■

N. OF COMPRESSOR: 1/2/3/4 

■

N. OF EVAPORATORS (if compressor number >2)

■

Max number of pulses to load 
compressor

■

Max number of pulses to unload 
compressor

15

15

Min. Time between same 
compressor start

600 s

Min. Time between different 
compressor start

120 s

Min. Time compressor On

120 s

Min. Time compressor Off

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. of compressors

Number of pulses

to load comp.

Number of pulses

to unload comp.

015

015

Min T between same

comp. starts

comp. starts

Min T between diff.

600

120

s

s

Min Time compressor

ON

OFF

Min Time compressor

120

180

s

s

Interstage time

Double pulse under

210

035

s

%

Compressor Unloading

Min pulse period

Max pulse period

Pulse time

00.3

01

010

s

s

s

ESIE07-05.book  Page 34  Friday, December 21, 2007  3:21 PM

Содержание EWWQ-AJYNN

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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