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EWWQ090G ÷  EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G   ÷ EWLQ720L   - R410A - Condenser less
EWHQ100G  ÷ EWHQ400G  - R410A - Heat pump scroll chillers
EWAQ-

- R410A - Air-cooled scroll chillers

EWAQ-

- R410A - Air-cooled scroll chillers

EWYQ-

- R410A - Air-cooled scroll heat pumps

Air and Water cooled scroll chillers & heat pump

Operation

Manual

EWWQ - EWLQ - EWHQ
EWAQ - EWYQ

Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN

Operation Manual

9

again. The alarm must be reset on the switch itself and on the Unit Controller. The triggering
pressure value cannot be changed.



Relief Safety Valve

If the pressure becomes too high in the refrigerant circuit, the relief valve will open to limit the
maximum pressure. If this happens switch off immediately the machine and contact your local
service organization.

1.4 Available sensors

1.4.1 Pressure transducers

Two electronic sensors are used to measure the evaporating and condensing pressure of each
circuit. The range of each sensor is clearly indicated on the sensor casing.

1.4.2 Temperature sensors

The evaporator and condenser water sensors are installed in the entering and leaving side.
Additionally each circuit installs a suction temperature sensor to monitor and control the
superheated refrigerant temperatures.

1.4.3 Thermistors

Each compressor is equipped with PTC thermistors which are immersed into motor windings for
motor protection. Thermistors trip to a high value in case the motor temperature reaches a
hazardous temperature.

1.5 Available Controls

In the following the different functions will be distinguished between Water Cooled (W/C) and Air
Cooled (A/C) units and Cooling Only (C/O) and Heat Pumps (H/P). If not specified one specific
function can apply to any W/C unit independently from being a C/O or H/P unit.

1.5.1 Evaporator - Condenser pumps

The controller can regulate one or two evaporator pumps and takes care of automatic change-over
between pumps. It’s also possible to prioritize the pumps and temporarily disable one of the twos.

The controller can also regulate an unique condenser water pump (W/C units only).

1.5.2 Compressors

The controller can regulate two or four compressors installed on one or two independent refrigerant
circuit. All the safeties of each compressor will be managed by the controller

.

1.5.3 Expansion Valve

The controller can regulate an electronic expansion valve per each refrigerant circuit to guarantee
the best operation for the refrigerant circuit.

1.5.4 Four Way Valve

The controller can command a four way valve per each refrigerant circuit where required. The
valve is used to reverse the unit mode from Cool to Heat.

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Содержание EWWQ-G

Страница 1: ... cooled scroll chillers EWLQ G Condenser less EWHQ G Heat pump Air cooled ranges EWAQ G EWAQ G EWYQ G heat pump Refrigerant R410A D EOMHW00107 15EN Operation manual Rev 00 Date Supersedes Air and water cooled scroll chillers heat pump ...

Страница 2: ... safety devices 7 1 3 2 Circuit safety devices 7 1 3 3 Component safety devices 7 1 4 Available sensors 9 1 4 1 Pressure transducers 9 1 4 2 Temperature sensors 9 1 4 3 Thermistors 9 1 5 Available Controls 9 1 5 1 Evaporator Condenser pumps 9 1 5 2 Compressors 9 1 5 3 Expansion Valve 9 1 5 4 Four Way Valve 9 1 6 Abbreviations used 10 1 7 Customer Terminal Block Connections 10 1 7 1 Connections des...

Страница 3: ...Update procedure 22 3 8 Optional Remote User Interface 24 3 9 Embedded Web Interface 26 4 Menu Structure 28 4 1 Main Menu 28 4 2 View Set Unit 29 4 2 1 Thermostat Ctrl 29 4 2 2 Network Ctrl 29 4 2 3 Unit Cond Ctrl W C only 29 4 2 4 Pumps 30 4 2 5 Master Slave 30 4 2 6 Date Time 32 4 2 7 Power Conservation 32 4 2 8 Controller IP setup 32 4 3 View Set Circuit 33 4 3 1 Settings 33 4 4 Tmp Setpoints 3...

Страница 4: ...trol Settings 43 5 1 5 Alarm Settings 45 5 1 6 Pumps 46 5 1 7 Power Conservation 46 5 2 Unit Circuit Start up 49 5 2 1 Prepare the unit to start 49 5 2 2 Preparing circuits to start 51 5 3 Circuit Capacity Control 52 5 3 1 Low Evaporating Pressure 52 5 3 2 High Condensing Pressure 53 5 4 Mode Change Over H P only 53 5 5 Backup Heaters A C only 53 5 6 Condensation Control W C only 54 5 6 1 Pressure...

Страница 5: ...ooled scroll heat pumps Air and Water cooled scroll chillers heat pump Operation Manual EWWQ EWLQ EWHQ EWAQ EWYQ Air or Water cooled scroll chiller heat pump D EOMHW00107 15EN Operation Manual 5 6 Alarms 65 6 1 1 Unit Warning Alarms 65 6 1 2 Unit Pumpdown Stop Alarms 67 6 1 3 Unit Rapid Stop Alarms 69 6 1 4 Master Slave Alarm 72 6 1 5 Circuit Warning Alarms 74 6 1 6 Circuit Pumpdown Stop Alarms 75...

Страница 6: ... components and accompanying parts supplied separately must be read understood and followed Apply all standard safety codes and practices Wear safety glasses and gloves Use the proper tools to move heavy objects Move units carefully and set them down gently 1 2 Avoid electrocution Only personnel qualified in accordance with IEC International Electrotechnical Commission recommendations may be permi...

Страница 7: ... motors to stop but does not switch off power to the unit Do not service or operate on the unit without having switched off the main switch 1 3 2 Circuit safety devices Safety of this level of severity will shut down the circuit they protect The remaining circuits will keep running 1 3 3 Component safety devices Safety of this level of severity will shut down a component against abnormal running c...

Страница 8: ...atically activated when the water temperature entering or leaving at the evaporator drops below the antifreeze limit In freeze condition if the unit is in standby the evaporator pump will be activated to prevent freezing of the evaporator If the freeze condition will activate when the unit is running all the unit will shut down in alarm while the pump will keep running Alarm will automatically cle...

Страница 9: ...d control the superheated refrigerant temperatures 1 4 3 Thermistors Each compressor is equipped with PTC thermistors which are immersed into motor windings for motor protection Thermistors trip to a high value in case the motor temperature reaches a hazardous temperature 1 5 Available Controls In the following the different functions will be distinguished between Water Cooled W C and Air Cooled A...

Страница 10: ...Water Temperature CEWT Condenser Entering Water Temperature 1 7 Customer Terminal Block Connections 1 7 1 Connections description and purpouse The contacts below are available at the user s terminal block referred as MC24 or MC230 in the wiring diagram The following table summarizes the connections at the user s terminal block Description Terminals Notes Evaporator Flow Switch mandatory 724 708 Fo...

Страница 11: ...or to start up the unit 1 7 1 2 Double setpoint This contact can be used to switch between two different LWT setpoints and depending on the application between different modes of operation Ice operation must be selected in case of ice storage application In this case the UC will run the chiller in on off mode switching all the chiller off as soon as the setpoint is reached In this case the unit wi...

Страница 12: ...eat pump scroll chillers EWAQ G 075 R410A Air cooled scroll chillers EWAQ R410A Air cooled scroll chillers EWYQ R410A Air cooled scroll heat pumps Air and Water cooled scroll chillers heat pump Operation Manual Operation Manual 12 EWWQ EWLQ EWHQ EWAQ EWYQ Air or Water cooled scroll chiller heat pump D EOMHW00107 15EN ...

Страница 13: ...e UC to ensure their safe operation UC also gives access to a Test routine covering all inputs and outputs The controller can work in accordance with three independent modes Local mode the machine is controlled by commands from the user interface Remote mode the machine is controlled by remote contacts volt free contacts Network mode the machine is controlled by commands from a BAS system In this ...

Страница 14: ... configured for 2 circuits Option Module POL965 00 MCQ 18 Used when options required All boards are supplied from a common 24 Vac sourced directly from the unit Extension boards can be directly powered by the Unit Controller All boards can be also supplied by a 24Vdc source These are the limits for the two different power supplies available AC 24V 20 frequency 45 65Hz DC 24V 10 Maintain the correc...

Страница 15: ...0 MCQ Optional Modbus POL902 00 MCQ Optional BACnet MSTP POL904 00 MCQ Optional Separate documents contains all the information about the different protocols supported and how to setup a proper communication with a BMS 2 4 1 Modbus Module installation In case of Modbus connection with a BMS the corresponding module has to be installed on the unit It has to be connected to the Unit Controller as in...

Страница 16: ...with a set of extension modules that implement additional features All boards communicate via an internal peripheral bus with the UC The UC continuously manages the information received from the various pressure and temperature probes installed on the unit The UC incorporates a program that controls the unit Two different types of UC HMI are available as standard HMI 1 Inbuilt HMI A C units This H...

Страница 17: ...n the unit read the following recommendations When all the operations and all the settings have been carried out close all the switchbox panels The switchbox panels can only be opened by trained personnel When the UC requires to be accessed frequently the installation of a remote interface is strongly recommended Compressor are protected from freezing by electrical heaters These heaters are suppli...

Страница 18: ...ump to a different page In this case the HMI will jump to the Enter Password page E n t e r P a s s w o r d 2 2 E n t e r P W 3 3 Passwords The HMI structure is based on access levels that means that each password will disclose all the settings and parameters allowed to that password level Basic information about the status including the active alarm list active setpoint and controlled water tempe...

Страница 19: ...In the new page rotate the wheel or use button 4 5 to highlight the Network Ctrl and press the wheel or the button 6 again to jump to the next menu where it is possible read the actual Control Source Example 2 Change a Set point the chilled water set point for example This parameter is designated as Cool LWT Set point 1 and is a unit set parameter From the Main Menu select Active Setpt The arrow i...

Страница 20: ...een Application BSP update or inizialization Contact Service Extension modules BSP LED BSP LED Mode Solid Green BSP running Solid Red Hardware Error Flashing Red BSP Error Flashing Red Green BSP upgrade mode BUS LED BUS LED Mode Solid Green Communication running I O working Solid Yellow Communication running but parameter from the application wrong or missing or uncorrect factory calibration Solid...

Страница 21: ...ing Solid Yellow Startup or one configured channel not communicating to the Master Solid Red All configured Communications down Means no communication to the Master The timeout can be configured In case that the timeout is zero the timeout is disabled 3 6 Controller maintenance The UC requires to maintain the installed battery Battery model is BR2032 and it is produced by many different vendors On...

Страница 22: ... any update process can be started Supported SD types are SD standard High speed SD SDHC The following SD cards have also been tested and found operational 1 GByte SD V1 0 Inmac 2 GByte SD V2 0 SpeedClass 2 SanDisk 4 GByte SDHC V2 0 SpeedClass 6 Hama High Speed Pro 4 GByte SDHC V2 0 SpeedClass 4 SanDisk Ultra II 8 GByte micro SDHC SpeedClass 4 Kingston In case an update is received all the files i...

Страница 23: ...Restore menu for details Remove power to the controller using the Q12 switch and insert the SD card in its slot as shown in the picture with the contact strips looking toward you Once this is done insert the pin in the reset hole gently push the service microswitch and keep it pressed until the update process is initiated Service microswitch is an electronic component An excessive pressure on the ...

Страница 24: ...l blink green during the boot up and then it will remain solid green to indicate normal operations It s now possible to restore the previous settings if available and restart the unit 3 8 Optional Remote User Interface As an option an external Remote HMI can be connected on the UC The Remote HMI offers the same features as the inbuilt display plus the alarm indication done with a light emitting di...

Страница 25: ...ess the wheel to access it The remote will automatically show the units attached to it no initial entry is required Long press of the ESC button will show the list of the connected controllers Use the weel to select the desired controller The Remote HMI can be extended up to 700m using the process bus connection available on the UC With a daisy chain connection as below a single HMI can be connect...

Страница 26: ...nterface The unit controller an embedded web interface that can be used to monitor the unit when connected to a local network It is possible to configure the IP addressing of the controller as a fixed IP of DHCP depending on the network configuration With a common web browser a PC can connect with the unit controller entering the IP address of the controller or the host name both visible in the Ab...

Страница 27: ...d follows the same rules in terms of access levels and structure In addition it allows to trend log a maximum of 5 different quantities It s required to click on the value of the quantity to monitor and the following additional screen will become visible More than one page can be opened at the same time This can allow to monitor more trends of different tabs Depending on the web browser and its ve...

Страница 28: ...All Cir Disabled Off Unit Alarm Off Keypad Disable Off BAS Disable Off Unit Loc Rem Sw Off Test Mode Auto Wait For Load Auto Evap Recirc A C only Auto Water Recirc W C only Auto Wait For Flow Auto Pumpdn Auto Max Pull Limited Auto Unit Cap Limit Off Cfg Chg Rst Ctrlr Status of the Unit Active Setpt 7 0 C Active setpoint and link to the Setpoint page see section 4 3 1 5 for more details Evap LWT 27...

Страница 29: ...ect the active setpoint for unit stage up and down Max Pulldn 1 7 C min 0 1 2 7 C min Max pull down rate of controlled water temperature Max PullUp 1 7 C min 0 1 2 7 C min Max pull up rate of controlled water temperature Stg Up Delay 2min 0 8min Compressor start inter stage delay Stg Dn Delay 30sec 20 60sec Compressor stop inter stage delay Strt Strt Dly 10min 10 60min Compressor Start to Start de...

Страница 30: ...n For more details refer to section 5 10 Setpoint Sub Menu Default Range Description Standby Chiller Submenu Standby Chiller Options Submenu Options Thermostat Ctrl Submenu Thermostat Ctrl Data Submenu Data Timers Submenu Timers Disconnect Unit No No Yes Parameter to disconnect the unit by the Master Slave network When this parameter is set to Yes the unit follows all local settings 4 2 5 1 Standb...

Страница 31: ...ystem Setpoint Sub Menu Default Range Description Start Up DT 2 7 C 0 0 5 0 C Offset respect the active setpoint for the unit startup Start Up DT 1 5 C 0 0 5 0 C Offset respect the active setpoint for the unit shutdown Threshold 60 30 100 Threshold of load that have to reach all units running before allow the startup of a new chiller Stage Up Time 5min 0min 20min Minimum time between the start of ...

Страница 32: ...ock settings are maintained thanks to a battery mounted on the controller Make sure that the battery is replaced regularly each 2 years see section 3 6 4 2 7 Power Conservation This page resumes all the settings that allows chiller capacity limitations For more details about these parameters and the functions LWT Reset and Demand Limit refer to section 5 1 7 Setpoint Sub Menu Default Range Descrip...

Страница 33: ...tion Circuit 1 Menu for Circuit 1 Circuit 2 Menu for Circuit 2 if present The submenus accessed for each circuit are identical but the content of each of them reflects the status of the corresponding circuit In the following the submenus will be explained only once If only one circuit is available the item Circuit 2 in the above table will be hidden and not accessible Setpoint Sub Menu Default Ran...

Страница 34: ...st stop Run Hours 0h Running hours of compressor No Of Starts 0 Number of compressor starts The compressors enable page allows to enable or disable each compressor of the unit Setpoint Sub Menu Default Range Description Comp 1 Auto Off Auto Enabling of the compressor Comp 2 Auto Off Auto Enabling of the compressor if available Comp 3 Auto Off Auto Enabling of the compressor Comp 4 Auto Off Auto En...

Страница 35: ... the defrost procedure refer to section 5 8 Setpoint Sub Menu Default Range Description Man Defrost Off Off On Closed Pressure Superheat Defrost Cnt 0 Counter of defrost cycles Defrost State W W Pr1 4W1 Df Pr2 4W2 WuH Defrost execution phase Cond Pr Lim 2960kPa 2200 3100kPa Condensing pressure limit to finish the defrost Time to Defrost 20s 0 310s Delay before the defrost is started when the defro...

Страница 36: ...rs for each compressor When the cycle timers are active any new start of a compressor is inhibited Setpoint Sub Menu Default Range Description Comp 1 0s Comp 2 0s Comp 3 0s Comp 4 0s Clear Cycle Tmrs Off Off On Clear Cycle Timers Stg Up Dly Rem Stg Dn Dly Rem Clr Stg Delays Off Off On Clear Stages Delays Ice Cycle Dly Rem Clear Ice Dly Off Off On Cleat Ice Delay 4 8 Alarms This link jumps to the A...

Страница 37: ...ongs to Master Slave network M S Nom Of Unit 2 2 3 4 Indicate the number of chiller belonging to Master Slave network This parameter have to be set only in the chiller Master in all Slave units it can be let at default value as ignored M S Sns Type NTC10K NTC10K PT1000 Define the sensor type used to measure the common leaving water temperature This parameter have to be set only in the chiller Mast...

Страница 38: ...ge Description Evap LWT 7 0 C Evaporator LWT current reading includes the offset Evp LWT Offset 0 0 C 5 0 5 0 C Evaporator LWT calibration Evap EWT 12 0 C Evaporator EWT current reading includes the offset Evp EWT Offset 0 0 C 5 0 5 0 C Evaporator EWT calibration Cond LWT 35 C Condenser LWT current reading includes the offset W C only Cond Lwt Offset 0 0 C 5 0 5 0 C Condenser LWT calibration W C o...

Страница 39: ... Evaporator Pump 2 relay Cnd Pmp1 Outpt Off Off On Status of the Condenser Pump 1 relay Cnd Pmp2 Outpt Off Off On Status of the Condenser Pump 2 relay Evap EWT Res 0Ohm 340 300kOhm Resistance of the Evap EWT sensor Evap LWT Res 0Ohm 340 300kOhm Resistance of the Evap LWT sensor Cond EWT Res 0Ohm 340 300kOhm Resistance of the Cond LWT sensor Cond LWT Res 0Ohm 340 300kOhm Resistance of the Cond LWT ...

Страница 40: ...al unit settings This feature can be useful when a software upgrade is needed or to keep a copy of the actual settings for future usages like a controller replacement In case of backup part of the settings like number of starts and running hours may not be restored Backups may be done periodically to save a more recent status of the settings This page has all the setpoints to command a save and or...

Страница 41: ... Default Range Description Model Code name G O This field could contain the unit order number OVyy zzzzz Unit S N Unit serial number Enter Data This field should contain the unit serial number CH yyLxxxxx BSP Ver Firmware version App Ver Software version HMI GUID Unique Identification of the HMI software HEX number for HMI GUID OBH GUID Unique Identification of the OBH software HEX number for OBH ...

Страница 42: ...tioning which is activated through the Cool Heat switch on the electric box Switch COOL The chiller will work in cooling mode with the Cool LWT 1 as the Active Setpoint Switch HEAT The chiller will work in heat pump mode with the Heat LWT 1 as the Active Setpoint Heat Cool w Glycol Set in case a dual cool heat mode is required This setting implies an operation with double functioning which is acti...

Страница 43: ...4 Thermostat Control Settings Thermostat control settings allow to set up the response to temperature variations and the precision of the thermostat control Default settings are valid for most applications however site specific conditions may require adjustments in order to have a smooth and precise temperature control or a quicker response of the unit The parameters mentioned below can be set fro...

Страница 44: ...or can start only if since its previous stop the Stop to Start Delay has expired The unit capacity remains constant if the controlled temperature is within the interval Setpoint Stage Up DT Setpoint Stage Down DT The following table summarize the conditions for compressors start and shut down explained above Cool Mode Heat Mode First Compressor Start Controlled Temperature Setpoint Start Up DT Con...

Страница 45: ...re of the unit It is generally recommended to set to a value whose saturated temperature is 8 to 10 C below the minimum active setpoint This will allow a safe operation and a proper control of compressor suction superheat Low Press Unload Set lower than the hold threshold enough to allow a suction pressure recovery from fast transients without unloading the compressor A 20 kPa differential is gene...

Страница 46: ...o Enabled and there are compressors available to run The pumps connected to the source water circuit water circuit connected with the cooling tower water well etc are started only when at least one of the compressor is started When the unit is configured as Heat Pump with water inversion the controller inverts the functioning of the pumps This means that the pump managed for the load water circuit...

Страница 47: ...mit Displays active demand limit 5 1 7 2 LWT Reset The LWT Reset function applies a variable offset to the base temperature setpoint selected through the interface from the menu Temperature Setpoints 4 3 1 5 If the unit works in Chiller mode the offset has a positive value so the new setpoint will be greater than the base setpoint If the unit works in Heat pump mode the offset has a negative value...

Страница 48: ... If the unit works in heat pump mode with water inversion the correction depends on the condenser entering return water temperature W C only When the evaporator condenser ΔT becomes lower than the SRΔT value an offset to the LWT setpoint is increasingly applied up to the MR value when the ΔT is equal to zero The Return Reset may affect negatively the chiller operation when operated with variable f...

Страница 49: ...g 5 2 Unit Circuit Start up In this section starting and stopping sequence of the unit will be described All HMI status will be briefly described to allow a better understanding of what is going on into the chiller control 5 2 1 Prepare the unit to start In order to let the unit start all the enable signals has to be changed to enable The list of enabling signals are Local Remote Enable signals En...

Страница 50: ...led by keypad or can be all in alarms Check the individual circuit status for further details Unit Alarm A unit alarm is active Check the alarm list to see what is the active alarm inhibiting the unit to start and check if the alarm can be cleared Refer to the Troubleshooting section before proceeding Keypad Disable The Unit has been disabled by keypad Check with your local maintenance if it can b...

Страница 51: ...e status of the circuit is indicated in the View Set Circuit Circuit x The possible status will be described in the following table Overall Status Status Description Off Ready Circuit is off waiting for a stage up signal from thermostat control Cycle Timer Circuit is off waiting for the compressor cycle timer to expire All Comp Disable Circuit is off as all compressors are disable Keypad Disable C...

Страница 52: ... with the following flowchart 5 3 Circuit Capacity Control Once a Circuit is started capacity will be adjusted according to thermostat control requirements However there are some limitations which override the capacity control in order to prevent the chiller from abnormal running conditions These preventions are summarized below Low Evaporating Pressure High Condensing Pressure 5 3 1 Low Evaporati...

Страница 53: ... shut down in order to recover the normal operating conditions This condition is indicated on the controller display in the circuit status as Run Cond Press High The status is automatically cleared when the condensing pressure falls below the High Pressure Hold limit by 862 kPa If the condensing pressure rises above the Hi Press Stop limit the related circuit is immediately stopped and an High Pre...

Страница 54: ...tion must be active The Backup Heater is then deactivated if any of the following is TRUE the Leaving Water Temperature rises above the Heat Setpoint the Unit Mode is different from Heat A Capacity Limitation become active 5 6 Condensation Control W C only The UC provides the possibility to choose between three different types of condensing control 1 Pressure 2 Cond In 3 Cond Out Depending on the ...

Страница 55: ...uarantee the best operation at any ambient condition both in cool and heat mode In cooling mode the fan speed is controlled with a PID regulator in order to maintain the condenser pressure at a stable value Depending on the ambient temperature fans may not be able to maintain the condenser pressure at the setpoint even while running at the full speed Maximum fan speed can be lower than 100 this ma...

Страница 56: ...de The transition from Superheat Control to Pressure Control may happen only if the evaporating pressure increases above the Maximum Operating Pressure MOP limit Evap Press Max Op Press Whenever the circuit is running the EXV position is limited between 2 or 98 position Any time the circuit is in the Off or starts the shutdown procedure the EXV shall be in the closed position In this case addition...

Страница 57: ...rost will be performed in a sequence of 7 steps Nr Phase Description 1 W Wait for the defrost interstage timer to expire 2 Pr1 Preparation to 4 Way Valve change over to Cool Mode 3 4W1 4 Way Valve change over to Cool Mode execution 4 Df Defrost 5 Pr2 Preparation to 4 Way Valve change over to Heat Mode 6 4W2 4 Way Valve change over to Heat Mode execution 7 WuH Heating Warm Up back to normal operati...

Страница 58: ...very chiller of the Master Slave network is equipped with a pump The pump can be installed directly on the unit or in the pipe of the single chiller and it avoids the water flow in the evaporator if the chiller is in off state Every pump will be commanded only by the chiller to which is connected Plant 3 Double Chiller Pump Third plant type is an extension of the previous plant As standard every c...

Страница 59: ... section are reported all electrical connections necessary for the correct operation of the Master Slave function All schemes present in this section provide only a principle diagram of the electrical connection 5 10 2 1 Process Bus The following diagram shows how have to be connected the chillers between them to establish the Master Slave Network Starting from first chiller connect in parallel al...

Страница 60: ...he plant type where the Master Slave function is used 1 Single Common Pump In the plant type Single Common Pump where a unique pump provides all water flow all enable pump contacts of each chiller have to be connected in parallel so that it is possible to provide a unique enabling contact for the common pump The pump contact of each chiller is available on the customer terminal block Evaporator Pu...

Страница 61: ...1 7 for the enumeration of the terminals 5 10 3 Master Slave Operation 5 10 3 1 Master Slave configuration The basic configuration of the Master Slave function requires the set of three parameters available in the unit configuration menu 4 9 1 Setpoint Sub Menu Default Range Description M S Address Standalone Standalone Master Slave 1 Slave 2 Slave 3 Define if the chiller works as standalone or if...

Страница 62: ...e that allows to disable the Master Disable the Master unit means that it will not use for the thermoregulation but it will continue to acquire the common leaving water temperature and it will continue to send the activation command to the slave units 5 10 3 3 System setpoint Temperature control in the MS is performed on the base of the common evaporator leaving water temperature respect the targe...

Страница 63: ...iority 2nd Lowest number of starts Lowest load 3rd Lowest running hours Highest running hours 4th Lowest address Highest number of starts 5th Lowest address First condition is related to the priority defined for each chiller The priority default values are all 1 i e all unit have the same priority A value of 1 indicates highest priority a value of 4 indicates lowest priority The priority values ca...

Страница 64: ... according to the following sequences network with one slave Master Slave 1 Master network with tow slaves Master Slave 1 Slave 2 Master network with three slaves Master Slave 1 Slave 2 Slave 3 Master Step 3 Interval time for rotation of the Standby Chiller Define the interval time for rotation of the Standby Chiller make sense only if the parameter Standby Chiller is set as Auto Setpoint Sub Menu...

Страница 65: ...larms are activated when the system or sub system can perform a normal shutdown in spite of the abnormal running conditions Rapid stop alarms are activated when the abnormal running conditions require an immediate stop of the whole system or sub system to prevent potential damages The UC displays the active alarms in a dedicated page and keep an history of the last 50 entries divided between alarm...

Страница 66: ...moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list DemandLimitAlm String in the alarm log DemandLimitAlm String in the alarm snapshot DemandLimit Alm Demand Limit input signal is out of the admissible range that is 3 21 mA Check the electrical connection of the demand limit signal Check the device that produces the demand limit signal 6 1 1 4 He...

Страница 67: ...mptom Cause Solution Unit status is Off All circuits are stopped with a normal shutdown procedure Bell icon is moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list UnitOff EvpEntWTempSen String in the alarm log UnitOff EvpEntWTempSen String in the alarm snapshot UnitOff EvapEntWTemp Sen Sensor is broken Check for sensor integrity Check correct sen...

Страница 68: ...f an acceptable range Symptom Cause Solution Unit status is Off All circuits are stopped with a normal shutdown procedure Bell icon is moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list UnitOff CndLvgWTempSen String in the alarm log UnitOff CndLvgWTempSen String in the alarm snapshot UnitOff CndLvgWTemp Sen Sensor is broken Check for sensor inte...

Страница 69: ...eplace the module Check if power supply is ok but LEDs are both off In this case replace the module refers to either driver 1 or driver 2 6 1 3 2 Options controller communication fail alarm This alarm is generated in case of communication problems with the module for optional functions POL965 with address 18 This alarm can occurs only if the at least one of the optional functions is enabled PVM Ex...

Страница 70: ... or because of certain working condition i e high values of OAT In these cases the issue can be related with the sizing of power cables There is a short circuit on the unit Check for correct electrical isolation condition of each unit s circuit with a Megger tester 6 1 3 4 Evaporator Flow Loss alarm This alarm is generated in case of flow loss on the evaporator This alarm protect the evaporator ag...

Страница 71: ...ing in the alarm snapshot UnitOff EvpFreeze Alm Water flow too low Increase the water flow Inlet temperature to the evaporator is too low Increase the inlet water temperature Flow switch is not working or no water flow Check the flow switch and the water pump Refrigerant temperature become too low 0 6 C Check the water flow and filter No good heat exchange conditions into the evaporator Sensors te...

Страница 72: ...ed to measure the common leaving water temperature is broken or not connected to the chiller defined master Symptom Cause Solution Every unit in the Master Slave Network works in local mode Bell icon is moving on master controller s display Led on the button 2 of the master External HMI is blinking String in the alarm list Common LWTSen String in the alarm log Common LWTSen String in the alarm sna...

Страница 73: ...ot start Bell icon is moving on Master controller s display Led on the button 2 of the Master External HMI is blinking String in the alarm list Slave X Missing String in the alarm log Slave X Missing String in the alarm snapshot Slave X Missing There is more than one unit configured with the same address and consequently the address in alarm is not configured Check all address assigned to each uni...

Страница 74: ...alarm is generated to indicate that the circuit hadn t been able to remove all the refrigerant from the evaporator Symptom Cause Solution Circuit status is Off Led on the button 2 of External HMI is blinking String in the alarm list Cx FailedPumpdownAlm String in the alarm log Cx FailedPumpdownAlm String in the alarm snapshot Cx FailedPumpdown Alm EEXV is not closing completely therefore there s s...

Страница 75: ...or on refrigerant circuit pipe Check for absence of water or humidity on sensor electrical contacts Check for correct plug in of the electrical connectors Check for correct sensors wiring also according with electrical scheme 6 1 6 2 Discharge Temperature Sensor fault A C only This alarm is generated to indicate that the sensor is not reading properly Symptom Cause Solution Circuit status is Off T...

Страница 76: ...t status is Off The compressor does not load anymore or even unload circuit is stopped immediately Bell icon is moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list Cx Off EvapPressLo String in the alarm log Cx Off EvapPressLo String in the alarm snapshot Cx Off EvapPress Lo Refrigerant charge is low Check sight glass on liquid line to see if ther...

Страница 77: ... if the value is in line with kg indication on unit label Condensing pressure transducer could not operate properly Check for proper operation of the high pressure sensor Fans do not operate properly A C only Check Fans operation Check that all the fans can run freely and at the proper speed Check the phase cut device 6 1 7 4 Low Delta Pressure Alarm A C only This alarm is generated if the pressur...

Страница 78: ...the electronic expansion valve Blocked valve can to impede the correct refrigerant flow Compressor 1 2 Soft Starter Failure Check Alarm code on the Soft Starter and refer to the related documentation to fix the alarm Check the size of the Soft Starter compared with the associated compressor maximum current 6 1 7 6 Start Fail Alarm This alarm can occurs only if the condenser less unit type is confi...

Страница 79: ...1 7 8 No Pressure Change At Start alarm This alarm indicates that the compressor is not able to start or it is not able to create a minimum variation of the evaporating or condensing pressures after start Symptom Cause Solution Circuit status is Off The circuit is stopped Bell icon is moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list Cx Off NoP...

Страница 80: ...e transducer is not operating properly Symptom Cause Solution Circuit status is Off The circuit is stopped Bell icon is moving on controller s display Led on the button 2 of External HMI is blinking String in the alarm list CxOff CndPressSen String in the alarm log CxOff CndPressSen String in the alarm snapshot Cx Off CondPress Sen Sensor is broken Check for sensor integrity Check correct sensors ...

Страница 81: ...illers EWAQ R410A Air cooled scroll chillers EWAQ R410A Air cooled scroll chillers EWYQ R410A Air cooled scroll heat pumps Air and Water cooled scroll chillers heat pump Operation Manual EWWQ EWLQ EWHQ EWAQ EWYQ Air or Water cooled scroll chiller heat pump D EOMHW00107 15EN Operation Manual 81 This page has been left intentionally free ...

Страница 82: ...acy reliability or fitness for particular purpose of its content and the products and services presented therein Specifications are subject to change without prior notice Daikin Europe N V explicitly rejects any liability for any direct or indirect damage in the broadest sense arising from or related to the use and or interpretation of this publication All content is copyrighted by Daikin Europe N...

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