Daikin EWYD4Z Operation manuals

Multipurpose Units

EWYD 4Z MultiPurpose Units

D-EOMZC00204-18_01EN Operation Manual

1/48

REV

Date

May 2018

Supersedes

D-EOMZC00204-18_00EN

EWYD4Z - Multipurpose Unit

D-EOMZC00204-18_01EN

OPERATING MANUAL

Multipurpose Units

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EWYD 4Z MultiPurpose Units

TABLE OF CONTENTS

1 SAFETY CONSIDERATIONS ....................................................................................................................................... 4

1.1 General ..................................................................................................................................................................................... 4

1.2 Avoid electrocution.................................................................................................................................................................... 4

1.3 Safety Devices .......................................................................................................................................................................... 4

2 GENERAL DESCRIPTION ............................................................................................................................................ 5

2.1 Basic Information ...................................................................................................................................................................... 5

2.2 Abbreviations used ................................................................................................................................................................... 5

2.3 Controller Operating Limits ....................................................................................................................................................... 5

2.4 Controller Architecture .............................................................................................................................................................. 5

2.5 Communication Modules........................................................................................................................................................... 6

3 USING THE CONTROLLER ......................................................................................................................................... 7

3.1 General Recommendation ........................................................................................................................................................ 7

3.2 Navigating ................................................................................................................................................................................. 7

3.3 Passwords ................................................................................................................................................................................ 8

3.4 Editing ...................................................................................................................................................................................... 8

3.5 Basic Control System Diagnostic .............................................................................................................................................. 8

3.6 Controller maintenance ............................................................................................................................................................. 9

3.7 Optional Remote User Interface ................................................................................................................................................ 9

3.8 Embedded Web Interface ....................................................................................................................................................... 10

4 WORKING WITH THIS UNIT ...................................................................................................................................... 12

4.1 Unit Setup ............................................................................................................................................................................... 12

4.1.1 Control Source .............................................................................................................................................................. 12

4.1.2 Operating Mode ............................................................................................................................................................. 12

4.1.3 Temperature Settings .................................................................................................................................................... 12

4.1.4 Pumps settings .............................................................................................................................................................. 13

4.1.5 Alarm Settings ................................................................................................................................ ............................... 13

4.1.6 Power Conservation ...................................................................................................................................................... 13

4.1.6.1 Demand Limit ..................................................................................................................................... 13

4.1.6.2 Current Limit (Optional) ...................................................................................................................... 14

4.1.6.3 Setpoint Reset .................................................................................................................................... 14

4.1.6.4 Setpoint Reset by OAT Reset ............................................................................................................ 14

4.1.6.5 Setpoint Reset by External 4-20 mA Signal ....................................................................................... 15

4.1.6.6 Setpoint Reset by Evaporator Return Temperature ........................................................................... 15

4.1.7 Date/Time ...................................................................................................................................................................... 15

4.1.7.1 Date,Time and UTC Settings ............................................................................................................. 15

4.1.7.2 Quiet Mode Scheduling ...................................................................................................................... 15

4.1.8 Scheduler ...................................................................................................................................................................... 15

4.2 Unit/Circuit Start-up................................................................................................................................................................. 15

4.2.1 Prepare the unit to start ................................................................................................................................................. 16

4.2.1.1 Unit Enable ......................................................................................................................................... 16

4.2.2 Unit Status ..................................................................................................................................................................... 16

4.2.3 Circuits Enable .............................................................................................................................................................. 17

4.2.4 Circuit Status ................................................................................................................................ ................................. 17

4.2.5 Circuit Preventions ........................................................................................................................................................ 18

4.2.5.1 High Water Temperature Limit ........................................................................................................... 18

4.2.5.2 Low Evaporating Pressure ................................................................................................................. 18

4.2.5.3 High Condensing Pressure ................................................................................................................ 18

4.2.5.4 High Vfd Current ................................................................................................................................ 19

4.2.5.5 High Discharge Temperature ............................................................................................................. 19

5 TROUBLESHOOTING ................................................................................................................................................ 20

5.1 Unit Alerts ................................ ................................................................................................................................ ............... 20

5.1.1 Bad Current Limit Input .................................................................................................................................................. 20

5.1.2 Bad Demand Limit Input ................................................................................................................................................ 20

5.1.3 Bad Leaving Water Temperature Reset Input ................................................................................................................ 21

5.1.4 Condenser Pump #1 Failure .......................................................................................................................................... 21

5.1.5 Condenser Pump #2 Failure .......................................................................................................................................... 21

5.1.6 Energy Meter Communication Fail ................................................................................................................................. 21

5.1.7 Evaporator Pump #1 Failure .......................................................................................................................................... 22

5.1.8 Evaporator Pump #2 Failure .......................................................................................................................................... 22

5.1.9 External Event ............................................................................................................................................................... 22

5.1.10 Fan Alarm Module Communication Fail ......................................................................................................................... 23

5.1.11 Heat Recovery Entering Water Temperature sensor fault .............................................................................................. 23

5.1.12 Heat Recovery Leaving Water Temperature sensor fault ............................................................................................... 23

5.1.13 Heat Recovery Water Temperatures inverted ................................................................................................................ 24

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5.1.14 Rapid Recovery Module Communication Fail ................................................................................................................ 24

5.1.15 Switch Box Temperature sensor fault ............................................................................................................................ 24

5.2 Unit Pumpdown Stop Alarms .................................................................................................................................................. 25

5.2.1 Condenser Entering Water Temperature (EWT) sensor fault ......................................................................................... 25

5.2.2 Condenser Leaving Water Temperature (LWT) sensor fault .......................................................................................... 25

5.2.3 Evaporator Entering Water Temperature (EWT) sensor fault ......................................................................................... 25

5.2.4 Evaporator Water Temperatures inverted ...................................................................................................................... 26

5.2.5 Outside Air Temperature (OAT) Lockout ................................................................................................ ........................ 26

5.2.6 Outside Air Temperature sensor fault alarm................................................................................................ ................... 26

5.3 Unit Rapid Stop Alarms ........................................................................................................................................................... 26

5.3.1 Condenser Water Freeze alarm ..................................................................................................................................... 26

5.3.2 Condenser Water Flow Loss alarm ................................................................................................................................ 27

5.3.3 Emergency Stop ............................................................................................................................................................ 27

5.3.4 Evaporator Flow Loss alarm ......................................................................................................................................... 27

5.3.5 Evaporator Leaving Water Temperature (LWT) sensor fault .......................................................................................... 28

5.3.6 Evaporator Water Freeze alarm ..................................................................................................................................... 28

5.3.7 External alarm ............................................................................................................................................................... 28

5.3.8 Gas Leakage Alarm ....................................................................................................................................................... 29

5.3.9 Heat Recovery Water Freeze Protect alarm ................................................................................................................... 29

5.3.10 OptionCtrlrCommFail ..................................................................................................................................................... 29

5.3.11 Power Fault ................................................................................................................................................................... 29

5.3.12 PVM alarm .................................................................................................................................................................... 30

5.4 Circuit Alerts ........................................................................................................................................................................... 30

5.4.1 Economizer Pressure Sensor fault ................................................................................................................................. 30

5.4.2 Economizer Temperature Sensor fault ........................................................................................................................... 31

5.4.3 Failed Pumpdown .......................................................................................................................................................... 31

5.4.4 Fan Fault ....................................................................................................................................................................... 32

5.4.5 Gas Leakage Sensor fault ............................................................................................................................................. 32

5.4.6 CxCmp1 MaintCode01 .................................................................................................................................................. 32

5.4.7 CxCmp1 MaintCode02 .................................................................................................................................................. 32

5.4.8 Power Loss.................................................................................................................................................................... 33

5.5 Circuit Pumpdown Stop Alarms ............................................................................................................................................... 33

5.5.1 Discharge Temperature Sensor fault ............................................................................................................................. 33

5.5.2 Gas Leakage fault ......................................................................................................................................................... 33

5.5.3 High Compressor Vfd Temperature fault ................................................................................................ ........................ 34

5.5.4 Liquid Temperature Sensor fault .................................................................................................................................... 34

5.5.5 Low Compressor Vfd Temperature fault ........................................................................................................................ 34

5.5.6 Low Oil Level fault ......................................................................................................................................................... 35

5.5.7 Low Discharge Superheat fault ...................................................................................................................................... 35

5.5.8 Oil Pressure Sensor fault ............................................................................................................................................... 35

5.5.9 Suction Temperature Sensor fault ................................................................................................................................. 36

5.6 Circuit Rapid Stop Alarms ....................................................................................................................................................... 36

5.6.1 Compressor Extension Communication Error ................................................................................................................ 36

5.6.2 EXV Driver Extension Communication Error .................................................................................................................. 36

5.6.3 Compressor VFD Fault .................................................................................................................................................. 37

5.6.4 Compressor VFD OverTemp ......................................................................................................................................... 37

5.6.5 Condensing Pressure sensor fault ................................................................................................................................. 37

5.6.6 Economizer EXV Driver Error ........................................................................................................................................ 38

5.6.7 Economizer EXV Motor Not Connected ......................................................................................................................... 38

5.6.8 Evaporating Pressure sensor fault ................................................................................................................................. 38

5.6.9 EXV Driver Error ............................................................................................................................................................ 39

5.6.10 EXV Motor Not Connected (TZ B, MP) .......................................................................................................................... 39

5.6.11 Fail Start Low Pressure ................................................................................................................................................. 39

5.6.12 Fan VFD Over Current................................................................................................................................................... 39

5.6.13 High Discharge Temperature Alarm ............................................................................................................................... 40

5.6.14 High Motor Current Alarm .............................................................................................................................................. 40

5.6.15 High Motor Temperature Alarm ..................................................................................................................................... 41

5.6.16 High Oil Pressure Differential Alarm .............................................................................................................................. 41

5.6.17 High Pressure alarm ...................................................................................................................................................... 41

5.6.18 Low Pressure alarm ....................................................................................................................................................... 42

5.6.19 Low Pressure Ratio Alarm ............................................................................................................................................. 42

5.6.20 Maximum Number of Restart Alarm ............................................................................................................................... 43

5.6.21 Mechanical High Pressure Alarm ................................................................................................................................... 43

5.6.22 Mechanical Low Pressure Alarm.................................................................................................................................... 44

5.6.23 No Pressure At Start Alarm............................................................................................................................................ 44

5.6.24 No Pressure Change At Start Alarm .............................................................................................................................. 44

5.6.25 Overvoltage Alarm ......................................................................................................................................................... 45

5.6.26 Undervoltage Alarm ....................................................................................................................................................... 45

5.6.27 VFD Communication Failure .......................................................................................................................................... 46

6 OPTIONS .................................................................................................................................................................... 47

6.1 Energy Meter including Current Limit (Optional) ...................................................................................................................... 47

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RISK OF ELECTROCUTION: Even when the main circuit breaker or isolator is switched off, certain circuits may still be energized, since they may be connected to a separate power source.

RISK OF BURNS: Electrical currents cause components to get hot either temporarily or permanently. Handle power cable, electrical cables and conduits, terminal box covers and motor frames with great care.

ATTENTION: In accordance with the operating conditions the fans can be cleaned periodically. A fan can start at any time, even if the unit has been shut down.

The emergency stop causes all 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.

Do not operate on a faulty fan before the main switch has been shut off. Overtemperature protection is autoreset, therefore a fan may restart automatically if temperature conditions allow it.

Direct intervention on the power supply can cause electrocution, burns or even death. This action must be performed only by trained persons.

1 SAFETY CONSIDERATIONS

1.1 General

Installation, start-up and servicing of equipment can be hazardous if certain factors particular to the installation are not considered: operating pressures, presence of electrical components and voltages and the installation site (elevated plinths and built-up up structures). Only properly qualified installation engineers and highly qualified installers and technicians, fully trained for the product, are authorized to install and start-up the equipment safely.

During all servicing operations, all instructions and recommendations, which appear in the installation and service instructions for the product, as well as on tags and labels fixed to the equipment and 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 permitted access to electrical components. It is particularly recommended that all sources of electricity to the unit be shut off before any work is begun. Shut off main power supply at the main circuit breaker or isolator.

IMPORTANT: This equipment uses and emits electromagnetic signals. Tests have shown that the equipment conforms to all applicable codes with respect to electromagnetic compatibility.

1.3 Safety Devices

Each unit is equipped with safety devices of three different kinds:

 Emergency Stop  Overcurrent/Overload Protections  Overtemperature Protections  Phase reversal, under/over voltage, ground fault protections  Phase reversal, under/over voltage, ground fault protections  Freezing protection  High Pressure Protection  Low Pressure Protection  Mechanical High Pressure Switch  Relief Safety Valve  Inverter fault auto diagnostic

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A/C

Air Cooled

CEWT

Condenser Entering Water Temperature

CLWT

Condenser Leaving Water Temperature

Condensing Pressure

CSRT

Condensing Saturated Refrigerant Temperature

DSH

Discharge Superheat

Discharge Temperature

E/M

Energy Meter Module

EEWT

Evaporator Entering Water Temperature

ELWT

Evaporator Leaving Water Temperature

Evaporating Pressure

ESRT

Evaporating Saturated Refrigerant Temperature

EXV

Electronic Expansion Valve

HMI

Human Machine Interface

MOP

Maximum operating pressure

SSH

Suction SuperHeat

Suction Temperature

Unit controller (Microtech III)

W/C

Water Cooled

2 GENERAL DESCRIPTION

2.1 Basic Information

Microtech® III is a system for controlling single or dual-circuit air/water-cooled liquid chillers. Microtech® III controls compressor start-up necessary to maintain the desired heat exchanger leaving water temperature. In each unit mode it controls the operation of the condensers to maintain the proper condensation process in each circuit.

Safety devices are constantly monitored by Microtech® III to ensure their safe operation. Microtech® III also gives access to a Test routine covering all inputs and outputs. All Microtech® III controls can work in accordance with three independent modes:

 Local mode: the unit is controlled by commands from the user interface.  Remote mode: the unit is controlled by remote contacts (volt-free contacts).  Network mode: the unit is controlled by commands from a BAS system. In this case, a data communication cable

is used to connect the unit to the BAS.

When the Microtech® III system operates autonomously (Local or Remote mode) it retains all of its own control capabilities but does not offer any of the features of the Network mode. In this case monitoring of the unit operational data is still allowed.

2.2 Abbreviations used

In this manual, the refrigeration circuits are called circuit #1 and circuit #2. The compressor in circuit #1 is labelled Cmp1. The other in circuit #2 is labelled Cmp2. The following abbreviations are used:

2.3 Controller Operating Limits

Operation (IEC 721-3-3):

 Temperature -40...+70 °C  Restriction LCD -20… +60 °C  Restriction Process-Bus -25….+70 °C  Humidity < 90 % r.h (no condensation)  Air pressure min. 700 hPa, corresponding to max. 3,000 m above sea level

Transport (IEC 721-3-2):

 Temperature -40...+70 °C  Humidity < 95 % r.h (no condensation)  Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level.

2.4 Controller Architecture

The overall controller architecture is the following:

 One MicroTech III main controller  I/O extensions as needed depending on the configuration of the unit  Communications interface(s) as selected  Peripheral Bus is used to connect I/O extensions to the main controller.

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CAUTION: Maintain the correct polarity when connecting the power supply to the boards, otherwise the peripheral bus communication will not operate and the boards may be damaged.

Module

Siemens Part Number

Usage

BacNet/IP

POL908.00/MCQ

Optional

Lon

POL906.00/MCQ

Optional

Modbus

POL902.00/MCQ

Optional

BACnet/MSTP

POL904.00/MCQ

Optional

All boards are supplied from a common 24 Vac source. Extension boards can be directly powered by the Unit Controller. All boards can be also supplied by a 24Vdc source.

2.5 Communication Modules

Any of the following modules can be connected directly to the left side of the main controller to allow a BAS or other remote interface to function. Up to three can be connected to the controller at a time. The controller should automatically detect and configure itself for new modules after booting up. Removing modules from the unit will require manually changing the configuration.

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

Alarm status (from any page it links with the page with alarm list, alarm log and alarm snapshot if available)



Back to Main Page



Back to the previous level (it can be the Main Page)

M a i n M e n u 1 /

E n t e r P a s s w o r d



U n i t S t a t u s = O f f : U n i t S W

A c t i v e S e t p t = 7 . 0 °

M a i n M e n u 1 /  E n t e r P a s s w o r d



U n i t S t a t u s =

O f f : U n i t S W A c t i v e S e t p t = 7 . 0 °

3 USING THE CONTROLLER

The control system consists of a unit controller (UC) equipped with a set of extension modules that implement additional features. All boards communicate via an internal peripheral bus with the UC. The Microtech III continuously manages the information received from the various pressure and temperature probes installed on the compressors and communicated to the unit .The UC incorporates a program that controls the unit.

The standard HMI consists of an inbuilt display (A) with 3 buttons (B) and a push’n’roll control (C).

The keypad/display (A) consists of a 5-line by 22 character display. The function of the three buttons (B) is described below:

The push’n’roll command (C) is used to scroll between the different menu pages, settings and data available on the HMI

for the active password level. Rotating the wheel allows to navigate between lines on a screen (page) and to increase and decrease changeable values when editing. Pushing the wheel acts as an Enter Button and will jump from a link to the next set of parameters.

3.1 General Recommendation

Before switching on 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  Evaporator, compressors and related inverters are protected from freezing by electrical heaters. These heaters

are supplied through unit main supply and temperature controlled by thermostat or by the unit controller. Also the LCD display of the unit controller may be damaged by extremely low temperatures. For this reason, it is strongly recommended to never power off the unit during winter, especially in cold climates.

3.2 Navigating

When power is applied to the control circuit, the controller screen will be active and display the Home screen, which can also be accessed by pressing the Menu Button. The navigating wheel is the only navigating device necessary, although the MENU, ALARM, and BACK buttons can provide shortcuts as explained previously.

An example of the HMI screens is shown in the following picture.

A bell ringing in the top right corner will indicate an active alarm. If the bell doesn’t move it means that the alarm has been acknowledged but not cleared because the alarm condition hasn’t been removed. A LED will also indicate where the alarm

is located between the unit or circuits.

The active item is highlighted in contrast, in this example the item highlighted in Main Menu is a link to another page. By pressing the push’n’roll, the HMI will jump to a different page. In this case the HMI will jump to the Enter Password page.

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E n t e r P a s s w o r d 2 /

E n t e r P W * * *

USER

5321

MAINTENANCE

2526

E n t e r P a s s w o r d 2 /

E n t e r P W 5 * *

BSP LED

Mode

Solid Green

Application running

Solid Yellow

Application loaded but not running (*) or BSP Upgrade mode active

Solid Red

Hardware Error (*)

Flashing Green

BSP startup phase. The controller needs time for starting.

Flashing Yellow

Application not loaded (*)

Flashing Yellow/Red

Fail safe mode (in case that the BSP upgrade was interrupted)

Flashing Red

BSP Error (software error*)

Flashing Red/Green

Application/BSP update or inizialization

BSP LED

Mode

BUS LED

Mode

Solid Green

BSP running

Solid Green

Communication running, I/O working

Solid Red

Hardware Error (*)

Solid Red

Communication down (*)

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 informations about the status including the active alarm list, active setpoint and controlled water temperature can be accessed without the need to enter the password. The user UC handles two level of passwords:

The following information will cover all data and settings accessible with the maintenance password. User

password will disclose a subset of the settings explained in chapter Errore. L'origine riferimento non è stata trovata.. In the Enter Password screen, the line with the password field will be highlighted to indicate that the field on the right can

be changed. This represents a setpoint for the controller. Pressing the push’n’roll the individual field will be highlighted to allow an easy introduction of the numeric password. By changing all fields, the 4 digits password will be entered and, if correct, the additional settings available with that password level will be disclosed.

The password will time out after 10 minutes and is cancelled if a new password is entered or the control powers down. Entering an invalid password has the same effect as continuing without a password.

Once a valid password has been entered, the controller allows further changes and access without requiring the user to enter a password until either the password timer expires or a different password is entered. The default value for this password timer is 10 minutes. It is changeable from 3 to 30 minutes via the Timer Settings menu in the Extended Menus.

3.4 Editing

The Editing Mode is entered by pressing the navigation wheel while the cursor is pointing to a line containing an editable field. Once in the edit mode pressing the wheel again causes the editable field to be highlighted. Turning the wheel clockwise while the editable field is highlighted causes the value to be increased. Turning the wheel counter-clockwise while the editable field is highlighted causes the value to be decreased. The faster the wheel is turned, the faster the value is increased or decreased. Pressing the wheel again cause the new value to be saved and the keypad/display to leave the edit mode and return to the navigation mode.

A parameter with an “R” is read only; it is giving a value or description of a condition. An “R/W indicates a read and/or write opportunity; a value can be read or changed (providing the proper password has been entered).

3.5 Basic Control System Diagnostic

MicroTech III controller, extension modules and communication modules are equipped with two status LED (BSP and BUS) to indicate the operational status of the devices. The BUS LED indicates the status of the communication with the controller. The meaning of the two status LED is indicated below.

Main Controller (UC)

(*) Contact Service.

Extension modules

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Flashing Red

BSP Error (*)

Solid Yellow

Communication running but parameter from the application wrong or missing, or uncorrect factory calibration

Flashing Red/Green

BSP upgrade mode

BSP LED

Mode

Solid Green

BPS running, communication with controller

Solid Yellow

BSP running, no communication with controller (*)

Solid Red

Hardware Error (*)

Flashing Red

BSP Error (*)

Flashing Red/Green

Application/BSP update

BUS LED

LON

Bacnet MSTP

Bacnet IP

Modbus

Solid Green

Ready for Communication. (All Parameter loaded, Neuron configured). Doesn't indicate a communication with other devices.

Ready for Communication. The BACnet Server is started. It doesn't indicate an active communication

All Communication running

Solid Yellow

Startup

Startup. The LED stays yellow until the module receives a IP Address, therefore a link must be established.

Startup, or one configured channel not communicating to the Master

Solid Red

No Communication to Neuron (internal error, could be solved by downloading a new LON application)

BACnet Server down. Automatically a restart after 3 seconds are initiated.

BACnet Server down. Automatic restart after 3 seconds is initiated.

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.

Flashing Yellow

Communication not possible to the Neuron. The Neuron must be configured and set online over the LON Tool.

Communication modules

BSP LED (same for all modules)

(*) Contact Service.

BUS LED

3.6 Controller maintenance

The controller requires to maintain the installed battery. Every two years it’s required to replace the battery. Battery model is: BR2032 and it is produced by many different vendors.

To replace the battery remove the plastic cover of the controller display using a screw driver as shown in the following pictures:

Be careful to avoid damages to the plastic cover. The new battery shall be placed in the proper battery holder which is highlighted in the picture, respecting the polarities indicated into the holder itself.

3.7 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 diode located below the bell button.

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



MicroTech® III

The Remote can be ordered with the unit and shipped loose as a field installed option. It can also be ordered

any time after chiller shipment and mounted and wired on the job as explained on the following page. The remote panel is powered from the unit and no additional power supply is required.

All viewing and setpoint adjustments available on the unit controller are available on the remote panel. Navigation is identical to the unit controller as described in this manual.

The initial screen when the remote is turned on shows the units connected to it. Highlight the desired unit and press the wheel to access it. The remote will automatically show the units attached to it, no initial entry is required.

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 connected to up to 8 units. Refer to the specific HMI manual for details.

3.8 Embedded Web Interface

The MicroTech III controller has 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 MicroTech III 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 “About Chiller” page accessible without entering a password.

When connected, it will be required to enter a user name and a password. Enter the following credential to get access to the web interface:

User Name: ADMIN Password: SBTAdmin!

The Main Menu page will be displayed. The page is a copy of the onboard HMI and follows the same rules in terms of access levels and structure.

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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:

Depending on the web browser and its version the trend log feature may not be visible. It’s required a web browser supporting HTML 5 like for example:

 Microsoft Internet Explorer v.11,  Google Chrome v.37,  Mozilla Firefox v.32.

These software are only an example of the browser supported and the versions indicated have to be intended as minimum versions.

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Local

Unit is enabled by local switches placed into the switchbox, chiller mode (cool, cool w/glycol, ice), LWT setpoint and capacity limit are determined by local settings in the HMI.

Network

Unit is enable by a remote switch, chiller mode, LWT setpoint and capacity limit are determined by an external BMS. This function requires: Remote enable connection to a BMS (unit on/off switch must be in remote) Communication module and its connection to a BMS.

Mode

Description

Cool

Set if only chilled water temperature up to 4°C is required. No glycol is generally needed in the water circuit, unless ambient temperature may reach low values.

Cool w/Glycol

Set if only chilled water temperature below 4°C is required. This operation requires proper glycol/water mixture in the evaporator water circuit.

Cool/Ice w/Glycol

Set in case only a dual cool/ice mode is required. This setting implies an operation with double setpoint which is activated through a customer supplied switch, according to the following logic: Switch OFF: The chiller will work in cooling mode with the Cool LWT 1 being as the Active Setpoint. Switch ON: The chiller will work in ice mode with the Ice LWT as the Active Setpoint.

Ice w/Glycol

Set if only ice storage is required. The application requires the compressors to operate at full load until the ice bank is completed, and then to stop for at least 12 hours. In this mode the compressor(s) will not operate at part load, but will work only in on/off mode.

MultiPurpose

Set in case a contemporary cool/heat mode is required. This setting implies an operation with double functioning,

 with the Cool LWT 1 as the cooling Active Setpoint and  with the Heat LWT 1 as the heating Active Setpoint.

MultiPurpose w/Glycol

Set in case a contemporary cool/heat mode is required. This setting implies an operation with double functioning,

 with the Cool LWT 1 as the cooling Active Setpoint and  with the Heat LWT 1 as the heating Active Setpoint.

MultiPurpose/Ice w/Glycol

Set in case a contemporary cool/heat mode is required. This setting implies an operation with double functioning,

 with the Ice LWT as the cooling Active Setpoint and  with the Heat LWT 1 as the heating Active Setpoint.

Test

Enables the Manual Control of the unit. The manual test feature helps in debugging and checking the operational status of sensors and actuators. This feature is accessible only with the maintenance password in the main menu. To activate the test feature is required to disable the Unit from the Q0 switch and change the available mode to Test (see section 4.2.1).

4 WORKING WITH THIS UNIT

This section contains a guide on how to deal with the everyday usage of the unit. Next sections describe how to perform routine tasks on the unit, such as:

 Unit Setup  Unit/Circuit start-up  Alarm handling  BMS Control  Battery replacement

4.1 Unit Setup

Before starting up the unit, some basic settings need to be set by the customer according to the application.

 Control Source  Available Modes  Temperature Settings  Alarm Settings  Pump Settings  Power Conservation  Date/Time  Scheduler

4.1.1 Control Source

This function allows to select which source should be used for unit control. The following sources are available:

4.1.2 Operating Mode

The following operating modes can be selected through the Available modes setpoint.

4.1.3 Temperature Settings

Setpoint range is limited according to the selected operating mode. The controller includes:

 two set points in cooling mode (either standard cool or cool w/glycol)  two set points in heating mode  one set point in ice mode

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Operating Mode

Double Setpoint Input

Scheduler

LWT Setpoint

Default

Range

Cool OFF

Off, On Setpoint 1

Cool LWT 1

7.0°C

4.0°C  15.0°C

On Setpoint 2

Cool LWT 2

7.0°C

4.0°C  15.0°C

Ice

N/A

Ice LWT

-4.0°C

-8.0°C  4.0°C

Heat OFF

Off, On Setpoint 1

Heat LWT 1

45.0°C

30.0°C  60.0°C(*)

On Setpoint 2

Heat LWT 2

45.0°C

30.0°C  60.0°C(*)

#1 Only

Set to this in case of single pump or twin pump with only #1 operational (f.e. in case of maintenance on #2)

#2 Only

Set to this in case of twin pump with only #2 operational (f.e. in case of maintenance on #1)

Auto

Set for automatic pump start management. At each chiller start, the pump with the least number of hours will be activated.

#1 Primary

Set to this in case of twin pump with #1 running and #2 as a backup

#2 Primary

Set to this in case of twin pump with #2 running and #1 as a backup

Parameter

Description

Low Press Hold

Set the minimum refrigerant pressure 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 generally appropriate for most applications.

Evap Water Frz

Stops the unit in case the leaving temperature falls below a given threshold. To allow a safe operation of the chiller, this setting must be adequate to the minimum temperature allowed by the mixture water/glycol present in the evaporator water circuit.

Cond Water Frz

When glycol is used in the plant, always disconnect antifreeze electric heater.

The above setpoints are activated according to Operating mode, Double Setpoint or Scheduler selection. If the Time Scheduler is enabled the Double Setpoint input state will be ignored by the controller.

The table below lists the LWT Setpoint being activated according to the operation mode, the double setpoint switch status and the scheduler state. The table also reports the defaults and the range allowed for each setpoint.

(*) 30.0°C  65.0 for HT unit type

The LWT setpoint can be overridden in case the setpoint reset or the quiet mode are activated.

4.1.4 Pumps settings

The UC can manages one or two water pumps for both evaporator and, for W/C units, condenser. Number of pumps and their priority can be set from the HMI. The following options are available to control the pump(s):

4.1.5 Alarm Settings

If glycol is present in the water circuits, factory defaults values for the Alarm Limits listed below must be adjusted:

4.1.6 Power Conservation

4.1.6.1 Demand Limit

Demand limit function allows the unit to be limited to a specified maximum load. Capacity limit level is defined with an external 4-20 mA signal and linear relationship. 4 mA indicate maximum capacity available whereas 20 mA indicates minimum capacity available.

With demand limit function is not possible shutdown the unit but only unload it until minimum admissible capacity. Demand limit related setpoints available through this menu are listed in the table below.

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EWYD 4Z MultiPurpose Units

Parameter

Description

Unit Capacity

Displays current unit capacity

Demand Limit En

Enables demand limit

Demand Limit

Displays active demand limit

Parameter

Description

Setpoint Reset

Set the Setpoint Reset mode (None, 4-20 mA, Return, OAT)

Max Reset

Max Setpoint Reset (valid for all active modes)

Start Reset DT

Used on Setpoint Reset by Evaporator DT

Max Reset OAT

See Setpoint Reset by OAT Reset

Strt Reset OAT

See Setpoint Reset by OAT Reset

Capacity Limit

[%]

Minimum Capacity

Maximum

Capacity

Demand Limit

[mA]

Current

Limit [A]

Current Limit

Setpoint

4.1.6.2 Current Limit (Optional)

Current limit function allows to control unit power consumption taking current drawn below a specific limit. Starting from the Current Limit Setpoint defined through the HMI or BAS communication, user can decrease the real limit using an external 4-20mA signal as indicate in the graph below. With 20 mA real current limit is set to Current Limit Setpoint, whereas with 4 mA signal the unit is unloaded until minimum capacity.

Flexible

Current

4.1.6.3 Setpoint Reset

The setpoint reset function overrides the water temperature setpoints selected through the interface, when certain circumstances occur. This feature helps in reducing energy consumption optimizing comfort as well. Three different control strategies can be selected:

 Setpoint Reset by Outside Air Temperature (OAT)  Setpoint Reset by an external signal (4-20mA)  Setpoint Reset by Evaporator ΔT (Return)

The following setpoints are available through this menu:

4.1.6.4 Setpoint Reset by OAT Reset

The active setpoint is calculated applying a correction which is a function of ambient temperature (OAT). As temperature drops below the Start Reset OAT (SROAT), Cool LWT setpoint is gradually increased until OAT reaches the Max Reset OAT value (MROAT). Beyond this value, the Cool LWT setpoint is increased by the Max Reset (MR) value. As temperature grow over the Start Reset OAT (SROAT), Heat LWT setpoint is gradually reduced until OAT reaches the Max Reset OAT value (MROAT). Above this value, the Heat LWT setpoint is decreased by the Max Reset (MR) value.

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The Return Reset may affect negatively the chiller operation when operated with variable flow. Avoid to use this strategy in case of inverter water flow control.

The Quiet Mode may affect negatively chiller efficiency due to the increased condenser setpoint

Parameter

Default

Range

Quiet Mode

Disable

Disable, Enable

QM Start Hr (QMS)

21h

0…24h

QM Start Min

0min

0...60min

QM End Hr (QME)

0…24h

QM End Min

0min

0…60min

QM Cond Offset (CO)

5°C

0…10°C

Parameter

Description

Off

Unit Off

On Setpoint 1

Unit On and Cool LWT 1 is the active setpoint

On Setpoint 2

Unit On and Cool LWT 2 is the active setpoint

QME

Evap T

LWT SP

LWT SP + MR

QMS

time

CP SP

CP SP + CO

Cond Press

4.1.6.5 Setpoint Reset by External 4-20 mA Signal

The active setpoint is calculated applying a correction based on an external 4-20mA signal. 4 mA corresponds to 0°C correction, while 20 mA corresponds to a correction of the active setpoints as set in Max Reset (MR).

4.1.6.6 Setpoint Reset by Evaporator Return Temperature

The active cooling setpoint is calculated applying a correction that depends on the evaporator entering (return) water temperature. The active heating setpoint is calculated applying a correction that depends on the condenser entering (return) water temperature.

4.1.7 Date/Time

4.1.7.1 Date,Time and UTC Settings

Date, time and UTC settings are available in the HMI.

4.1.7.2 Quiet Mode Scheduling

The Quiet Mode can be used to reduce chiller noise in certain hours of the day when noise reduction is more important than cooling operation, like for example in night time. When Quiet Mode is activated, the LWT setpoint is increased by the maximum setpoint reset (MR) described in the chapter “Setpoint Reset”, thus forcing a capacity limitation to the unit without

losing control on chilled water temperature. Also, condenser temperature target is increased by a value set in “QM Cond

Offset”. In this way condenser fans are forced to reduce speed without losing control on condensation. Quiet mode is timer

enabled.

4.1.8 Scheduler

Unit On/Off can be managed automatically through the function Time Scheduler enabled when the parameter Unit Enable is set to Scheduler Errore. L'origine riferimento non è stata trovata.. For each day of the week user can define six time slots and choose for each time slot one of following mode:

4.2 Unit/Circuit Start-up

In this section, starting and stopping sequence of the unit will be described. status will be briefly described to allow a better understanding of what is going on into the chiller control.

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