Daikin EWWQ380B-SS User manual

Water-cooled screw chillers
EWWQ380B-SS~EWWQC20B-SS
EWWQ420B-XS~EWWQC21B-XS
50Hz –Refrigerant: R-410A
Original Instructions
Installation, Operation and Maintenance Manual
D–EIMWC00508-16EN

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Contents
General information………………………………………………………………………………………………………………….4
Warnings for the operator................................................................................................................................................... 4
Assistance.......................................................................................................................................................................... 4
Spare parts.........................................................................................................................................................................4
Receiving the machine....................................................................................................................................................... 4
Checks................................................................................................................................................................................5
Purpose of this manual.......................................................................................................................................................5
Important information on the refrigerant used ....................................................................................................................5
Operating limits ................................................................................................................................................................... 6
Storing ................................................................................................................................................................................ 6
Operation............................................................................................................................................................................ 6
Mechanical Installation....................................................................................................................................................... 7
Shipping..............................................................................................................................................................................7
Responsibility .....................................................................................................................................................................7
Safety..................................................................................................................................................................................7
Moving and lifting................................................................................................................................................................ 7
Positioning and assembly................................................................................................................................................... 9
Minimum space requirements ............................................................................................................................................ 9
Ventilation...........................................................................................................................................................................9
Sound protection ................................................................................................................................................................9
Water piping........................................................................................................................................................................9
Water treatment................................................................................................................................................................ 11
Evaporator and exchangers anti-freeze protection ..........................................................................................................11
Installing the flow switch...................................................................................................................................................11
Electrical Installation ........................................................................................................................................................ 13
General specifications...................................................................................................................................................... 13
Electrical components ...................................................................................................................................................... 14
Electrical wiring.................................................................................................................................................................14
Electrical heaters.............................................................................................................................................................. 14
Water pump control.......................................................................................................................................................... 14
Unit On/Off remote control –Electrical wiring .................................................................................................................. 14
Double Setpoint –Electrical wiring................................................................................................................................... 14
External water Setpoint reset –Electrical wiring (Optional)............................................................................................. 15
Unit limitation –Electrical wiring (Optional)...................................................................................................................... 15
Operation............................................................................................................................................................................ 17
Operator’s responsibilities ................................................................................................................................................ 17
Description of the machine............................................................................................................................................... 17
Description of the refrigeration cycle ................................................................................................................................ 17
Description of the refrigeration cycle with partial heat recovery.......................................................................................22
Controlling the partial recovery circuit and installation recommendations ....................................................................... 22
Compression process....................................................................................................................................................... 23
Pre-startup checks............................................................................................................................................................ 27
General............................................................................................................................................................................. 27
Units with external water pump ........................................................................................................................................28
Electrical power supply.....................................................................................................................................................28
Unbalance in power supply voltage.................................................................................................................................. 28
Electrical heaters power supply........................................................................................................................................28
Emergency Stop............................................................................................................................................................... 28
Startup procedure ............................................................................................................................................................. 29
Turning on the machine.................................................................................................................................................... 29
Seasonal shutdown..........................................................................................................................................................30
Starting up after seasonal shutdown................................................................................................................................ 30
System maintenance......................................................................................................................................................... 31
General............................................................................................................................................................................. 31
Compressor maintenance ................................................................................................................................................ 31
Lubrication........................................................................................................................................................................31
Replacement of filter dryer ............................................................................................................................................... 33
Procedure to replace the filter dryer cartridge.................................................................................................................. 34
Replacement of filter dryer ............................................................................................................................................... 34
Procedure to replace the filter dryer cartridge.................................................................................................................. 34
Rplacement of the oil filter................................................................................................................................................ 35
Fr3200 compressor............................................................................................................................................... 35
FR4 compressor ...................................................................................................................................................36
Fr4200 compressor............................................................................................................................................... 36
Refrigerant charge............................................................................................................................................................ 37
Procedure to replenish refrigerant....................................................................................................................................38
Standard Checks ............................................................................................................................................................... 39
Temperature and pressure sensors .................................................................................................................................39
Test sheet........................................................................................................................................................................... 40
Water side measurements................................................................................................................................................40

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Refrigerant side measurements .......................................................................................................................................40
Electrical measurements.................................................................................................................................................. 40
Service and limited warranty............................................................................................................................................ 41
Obligatory routine checks and starting up apparatuses under pressure ................................................................... 42
Important information regarding the refrigerant used .................................................................................................. 42
List of tables
Table 1 –Acceptable water quality limits............................................................................................................................ 11
Table 2 - Typical operating conditions with compressors at 100%..................................................................................... 29
Table 3 –Routine maintenance programme.......................................................................................................................33
List of Figures
Fig. 1 - Lifting the unit………………………………………………………………………………………………………………….8
Fig. 2–Minimum clearance requirements for machine maintenance…………………………………………………………….9
Fig. 3 –Water piping connection for heat recovery exchangers………………………………………………………………..10
Fig. 4 - Adjusting the safety flow switch ..............................................................................................................................12
Fig. 5 –User connection to the interface terminal board .................................................................................................... 15
Fig. 6 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS DUAL Fr4 unit .................................................................18
Fig. 7 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS Mono Fr4 unit.................................................................. 19
Fig. 8 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS DUAL 3200 unit............................................................... 20
Fig. 9 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS Mono 3200 unit ............................................................... 21
Fig. 10 - Picture of Fr4100 compressor...............................................................................................................................23
Fig. 11 –Picture of Fr3200 compressor.............................................................................................................................. 23
Fig. 12 - Compression process ...........................................................................................................................................24
Fig. 13- Refrigeration capacity control mechanism of compressor Fr3200 –Fr4...............................................................25
Fig. 14 - Capacity control mechanism.................................................................................................................................26
Fig. 15 - Installation of control devices for Fr4 compressor ................................................................................................32
Fig. 16 - Installation of control devices for Fr3200 compressor ..........................................................................................32

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General information
IMPORTANT
The units described in the present manual represent a valuable investment. Maximum care should be taken to
ensure correct installation and appropriate working conditions of the units.
Installation and maintenance must be performed by qualified and specifically trained personnel only.
Correct maintenance of the unit is indispensable for its safety and reliability. Manufacturer’s service centres are the
only having adequate technical skill for maintenance.
CAUTION
This manual provides information about the features and procedures for the complete series.
All units are delivered from factory as complete sets which include wiring diagrams and dimensional drawings with
size, weight and features of each model.
WIRING DIAGRAMS AND DIMENSIONAL DRAWINGS MUST BE CONSIDERED ESSENTIAL DOCUMENTS OF
THIS MANUAL
In case of any discrepancy between this manual and the two aforesaid documents, please refer to the wiring diagram
and dimensional drawings.
WARNING
Before starting the installation of the unit, please read this manual carefully. Starting up the unit is absolutely
forbidden if all instructions contained in this manual are not clear.
Warnings for the operator
READ THIS MAINTENANCE AND USE MANUAL BEFORE USING THE UNIT
THE OPERATOR MUST BE TRAINED AND INSTRUCTED ON HOW TO USE THE UNIT
THE OPERATOR MUST STRICTLY FOLLOW ALL INSTRUCTIONS, SAFETY REGULATIONS AND LIMITATIONS
REGARDING THE USE OF THE UNIT.
Key to symbols
Important note: failure to respect the instruction can damage the unit or compromise functioning
Note regarding safety in general or respect of laws and regulations
Note concerning electrical safety
Safe use and maintenance of the unit, as explained in this Maintenance and Use Manual, is fundamental to prevent any accidents
occurring to operators during both operation and maintenance as well as during repair work.
Therefore, it is highly recommended that this document be read carefully, complied with and stored safely.
Assistance
Should additional maintenance be required, it is advisable to consult authorised staff before carrying out any repair work.
Spare parts
Spare parts to be used for maintenance of the unit must be original. Therefore, always consult the manufacturer.
Receiving the machine
The machine must be inspected for any possible damage immediately upon reaching its final place of installation. All components
described in the delivery note must be carefully inspected and checked; any damage must be reported to the carrier. Before
connecting the machine to earth, check that the model and power supply voltage shown on the nameplate are correct.
Responsibility for any damage after acceptance of the machine cannot be attributed to the manufacturer.

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Checks
To prevent the possibility of incomplete delivery (missing parts) or transportation damage, please perform the following checks
upon receipt of the machine:
a) Before accepting the machine, please verify every single component in the consignment. Check for any damage.
b) In the event that the machine has been damaged, do not remove the damaged material. A set of photographs are helpful
in ascertaining responsibility.
c) Immediately report the extent of the damage to the transportation company and request that they inspect the machine.
d) Immediately report the extent of the damage to the manufacturer representative, so that arrangements can be made for
the required repairs. In no case must the damage be repaired before the machine has been inspected by the
representative of the transportation company.
Purpose of this manual
The purpose of this manual is to allow the installer and the qualified operator to carry out all required operations in order to ensure
proper installation and maintenance of the machine, without any risk to people, animals and/or objects.
This manual is an important supporting document for qualified personnel but it is not intended to replace such personnel. All
activities must be carried out in compliance with local laws and regulations.
Important information on the refrigerant used
This product contains fluorate gases which have a greenhouse effect and which are covered by the Kyoto protocol. Do not
release such gases into the atmosphere.
Type of refrigerant: R410A
GWP value(1) = 2087,5
The quantity of refrigerant used is indicated on the identity plate with the name of the unit.
Routine inspections may be necessary pursuant to local and/or European laws, to check on possible refrigerant leakage. For
more detailed information, contact your local dealer.
(1) GWP=Global warming potential
Description of the labels applied to the electrical panel
Single
Compressor unit
1–Lifting instructions
6–Gas type
2–Unit nameplate data
7–Hazardous Voltage warning
3–Non flammable gas symbol
8–Cable tightening warning
4–Manufacturer’s logo
9–Water circuit filling warning
5 –Emergency stop
10 –Electrical hazard symbol

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Two Compressors Unit
1–Unit nameplate data
6–Non flammable gas symbol
2–Lifting instructions
7–Manufacturer’s logo
3–Hazardous Voltage warning
8–Gas type
4–Cable tightening warning
9–Electrical hazard symbol
5 –Water circuit filling warning
10 –Emergency stop
Operating limits
Storing
The units of the series can be stored under the following environmental conditions:
Minimum ambient temperature : -20°C
Maximum ambient temperature : 41°C
Max. R.H. : 95% not condensing
ATTENTION
Storing below the minimum temperature mentioned above may cause damage to components such as the electronic
controller and its LCD display.
WARNING
Storing above the maximum temperature may cause opening of the safety valves on the compressor’s suction li ne.
ATTENTION
Storing in condensing atmosphere may damage the electronic components.
Operation
Operation is allowed within the limits mentioned in the following diagrams.
ATTENTION
Operation outside the mentioned limits may damage the unit.
In case of doubt contact the manufacturer.

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Mechanical Installation
Shipping
The stability of the machine during shipping must be ensured. If the machine is shipped with a wooden cross-plank on its base,
the cross-plank must be removed only after the final destination has been reached.
Responsibility
The manufacturer declines all responsibility, present and future, for any damage to persons, animals or property caused by
negligence of operators failing to follow the installation and maintenance instructions in this manual.
All safety equipment must be regularly and periodically checked in accordance with this manual and with local laws and
regulations regarding safety and environment protection.
Safety
The machine must be firmly secured to the ground.
It is essential to observe the following instructions:
- The machine can only be lifted using the lifting points on the base of the machine itself. These are the only points that can
support the entire weight of the unit.
- Do not allow unauthorised and/or unqualified personnel to access the machine.
- It is forbidden to access the electrical components without having opened the machine's general disconnecting switch and
switched off the power supply.
- It is forbidden to access the electrical components without using an insulating platform. Do not access the electrical components
if water and/or moisture are present.
- All operations on the refrigerant circuit and on components under pressure must be carried out by qualified personnel only.
- Replacement of a compressor or addition of lubricating oil must be carried out by qualified personnel only.
- Sharp edges can cause wounds. Avoid direct contact.
- Avoid introducing solid bodies into the water pipes while the machine is connected to the system.
- A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet.
- The machine is supplied with safety valves, that are installed on both the high and the low pressure sides of the refrigerant
circuit.
In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of the on-board
documentation delivered to the end user with this manual.
It is recommended to perform installation and maintenance with other people. In case of accidental injury or unease, it is
necessary to:
-keep calm
-press the alarm button if present in the installation site
-move the injured person in a warm place far from the unit and in rest position
-contact immediately emergency rescue personnel of the building or if the Health Emergency Service
-wait without leaving the injured person alone until the rescue operators come
-give all necessary information to the the rescue operators
WARNING
Before carrying out any operation on the machine, please read this instruction and operating manual carefully.
Installation and maintenance must be carried out only by qualified personnel that is familiar with the provisions of law
and local regulations and has been trained properly or has experience with this type of equipment.
WARNING
Avoid installing the machine in a place that could be dangerous during maintenance operations, such as (but not
only) platforms without parapets or railings or areas not complying with the clearance requirements.
Moving and lifting
Avoid bumping and/or jolting during unloading from the lorry and moving the machine. Do not push or pull the machine from any
part other than the base frame. Secure the machine inside the lorry to prevent it from moving and causing damage to the panels
and to the base frame. Do not allow any part of the machine to fall during transportation and/or unloading, as this could cause
serious damage.
All units of the series are supplied with four lifting points. Only these points may be used for lifting the unit, as shown in figure 1.

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Fig. 1 - Lifting the unit

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WARNING
Both the lifting ropes and the spacing bar and/or scales must be strong enough to support the machine safely.
Please check the unit’s weight on the machine’s nameplate.
The weights shown in the "Technical data" tables in the "General Information" chapter refer to standard units.
Some specific machines might have accessories that increase their overall weight (heat recovery, etc.)
WARNING
The machine must be lifted with the utmost attention and care. Avoid jolting when lifting and lift the machine very
slowly, keeping it perfectly level.
Positioning and assembly
All units are designed for installation indoors. The machine must be installed on a robust and perfectly level foundation; should the
machine be installed on balconies or roofs, it might be necessary to use weight distribution beams.
For installation on the ground, prepare a strong cement base that is at least 250 mm wider and longer than the machine. Also, this
base must be strong enough to support the weight of the machine as stated in the technical specifications.
If the machine is installed in places that are easily accessible to people and animals, it is advisable to install protection gratings for
the compressor section.
To ensure the best possible performance on the installation site, the following precautions and instructions must be followed:
Make sure to provide a strong and solid foundation to reduce noise and vibration as much as possible.
The water in the system must be particularly clean and all traces of oil or rust must be removed. A mechanical water filter
must be installed on the machine’s inlet piping.
Minimum space requirements
Every side of the machine must be accessible for all post-installation maintenance activities. Figure 2 shows the minimum space
necessary.
Fig. 2 –Minimum clearance requirements for machine maintenance
Ventilation
The temperature of the room where the unit is placed should be always maintained between 0°C and 40°C.
Sound protection
When sound levels require special control, great care must be exercised to isolate the machine from its base by appropriately
applying anti-vibration elements (supplied as an option). Flexible joints must be installed on the water connections, as well.
Water piping
Piping must be designed with the lowest number of elbows and the lowest number of vertical changes of direction. In this way,
installation costs are reduced considerably and system performance is improved.
The water system must have:

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1. Anti-vibration mountings in order to reduce transmission of vibrations to the underlying structure.
2. Isolating valves to isolate the machine from the water system during service.
3. Manual or automatic air venting device at the system’s highest point; drain device at the system’s lowest point. Neither
the evaporator nor the heat recovery device must be positioned at the system’s highest point.
4. A suitable device that can maintain the water system under pressure (expansion tank, etc.)
5. Water temperature and pressure indicators on the machine to assist the operator during service and maintenance.
6. A filter or device which can remove foreign particles from the water before it enters the pump (in order to prevent
cavitation, please consult the pump manufacturer for the recommended type of filter ). The use of a filter prolongs the life
of the pump and helps keep the water system in a better condition.
7. Another filter must be installed on the machine inlet water pipe, near the evaporator and heat recovery (if installed). The
filter prevents solid particles from entering the heat exchanger, as they could damage it or reduce its heat exchanging
capacity.
8. The heat recovery device must be emptied of water during the winter season, unless an ethylenic glycol mixture in
appropriate percentage is added to the water circuit.
9. If the machine is intended to replace of another, the entire water system must be emptied and cleaned before the new
unit is installed. Regular tests and proper chemical treatment of water are recommended before starting up the new
machine.
10. In the event that glycol is added to the water system as anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the machine’s performance will be lower and water pressure drops will be greater. All machine-
protection systems, such as anti-freeze, and low-pressure protection will need to be readjusted.
Before insulating water piping, check that there are no leaks.
Fig. 3 –Water piping connection for heat recovery exchangers

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ATTENTION
Install a mechanical filter on the inlet to each heat exchanger. Failure to install a mechanical filter allows solid
particles and/or welding slag to enter the exchanger. Installation of a filter with a mesh size not exceeding 0.5 mm in
diameter is advised.
The manufacturer cannot be held responsible for any damage to exchangers ensuing from the lack of a mechanical
filter.
Water treatment
Before putting the machine into operation, clean the water circuit. Dirt, scaling, corrosion residue and other foreign material can
accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure drops can increase as well, thus
reducing water flow. Proper water treatment therefore reduces the risk of corrosion, erosion, scaling, etc. The most appropriate
water treatment must be determined locally, according to the type of system and local characteristics of the process water.
The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by
improperly treated water.
Table 1 –Acceptable water quality limits
PH (25°C)
6.88.0
Total hardness (mg CaCO3/ l)
200
Electricity conductivity S/cm (25°C)
800
Iron (mg Fe / l)
1.0
Chloride ion (mg Cl - / l)
200
Sulphide ion (mg S2 - / l)
None
Sulphate ion (mg SO24- / l)
200
Ammonium ion (mg NH4+/ l)
1.0
Alkalinity (mg CaCO3 / l)
100
Silica (mg SiO2/ l)
50
Evaporator and exchangers anti-freeze protection
Two or more of below protection methods should be considered when designing the system as a whole:
1. Continuous water flow circulation inside piping and exchangers.
2. Addition of an appropriate amount of glycol inside the water circuit.
3. Additional heat insulation and heating of exposed piping.
4. Emptying and cleaning of the heat exchanger during the winter season.
It is the responsibility of the installer and/or local maintenance personnel to ensure that two or more of the described anti-freeze
methods are used. Make sure that appropriate anti-freeze protection is maintained at all times. Failure to follow the instructions
above could result in damage to some of the machine’s components. Damage caused by freezing is not covered by the warranty.
Installing the flow switch
To ensure sufficient water flow through the evaporator, it is essential that a flow switch be installed on the water circuit. The flow
switch can be installed either on the inlet or outlet water piping. The purpose of the flow switch is to stop the machine in the event
of interrupted water flow, thus protecting the evaporator from freezing.
A flow switch specifically gauged for this purpose, with identification code 131035072, is available as an option.
This paddle-type flow switch is suitable for heavy-duty outdoor applications (IP67) for pipe diameters in the range of 1" to 6".
The flow switch is provided with a clean contact which must be electrically connected to the terminals of the terminal board (check
the machine’s wiring diagram for further information).
For further information regarding device installation and settings, please read the instruction leaflet in the device box.

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Fig. 4 - Adjusting the safety flow switch
Refrigerating circuit safety valves
Each system comes with safety valves that are installed on each circuit, both on the evaporator and on the condenser.
The purpose of the valves is to release the refrigerant inside the refrigerant circuit in the event of certain malfunctions.
3” 83 mm
4” 107 mm
5” 134 mm
6” 162 mm
5 mm
For 3” - 6” piping
Use paddle b = 29 mm
Adjusting the flow switch’s
trigger sensitivity

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Electrical Installation
General specifications
CAUTION
All electrical connections to the machine must be carried out in compliance with laws and regulations in force.
All installation, operating and maintenance activities must be carried out by qualified personnel.
Please refer to the specific wiring diagram for the machine that you have purchased and which was sent with the unit.
Should the wiring diagram not appear on the machine or should it have been lost, please contact your dealer who will
provide for a copy to be forwarded.
CAUTION
Use copper conductors only. Use of conductors in any material other than copper could cause overheating or
corrosion at the connection points and damage the unit.
To avoid interference, all control wires must be installed separately from the power cables. Use separate electrical
conduits for this purpose.
CAUTION
Before servicing the machine in any way, open the general disconnecting switch on the machine’s main power supply.
When the machine is off but the disconnector switch is in the closed position, unused circuits are live, as well.
Never open the terminal board box of the compressors before having opened the unit’s general disconnecting switch.
CAUTION
Concurrence of single-phase and three-phase charges and unbalance between phases can cause leakages towards
ground of up to 150 mA during the normal operation of the units of the series.
If the unit includes devices that cause superior harmonics (such as VFD and phase cut), the leakage towards ground
could increase to very high values (about 2 Ampere).
The protections for the power supply system must be designed in accordance with the above mentioned values.

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Electrical components
All power and interface electrical connections are specified in the wiring diagram that is shipped with the machine.
The installer must supply the following components:
-Power supply wires (dedicated conduit)
-Interconnection and interface wires (dedicated conduit)
-Thermal-magnetic circuit breaker of suitable size (please see electrical data).
Electrical wiring
Power circuit:
Connect the electrical power supply cables to the terminals of the general circuit breaker on the machine’s
terminal board. The access panel must have a hole of appropriate diameter for the cable used and its cable
gland. A flexible conduit can also be used, containing the three power phases plus earth.
In any case, absolute protection against any water penetrating through the connection point must be ensured.
Control circuit:
Every machine of the series is supplied with an auxiliary 400/115V control circuit transformer. No additional
cable for the control system power supply is thus required.
Only if the optional separate accumulation tank is requested, the electrical anti-freeze resistance must have a
separate power supply.
Electrical heaters
Each circuit has an electrical heater installed in the compressor, whose purpose is to keep the oil warm thus preventing
the presence of liquid refrigerant mixed with the oil in the compressor. Obviously, the operation of the electrical heaters is
guaranteed only if there is a constant power supply. If it is not possible to keep the machine powered when inactive
during winter, apply at least two of the procedures described in the “Mechanical Installation” section under the “Anti -
freeze protection of evaporator and exchangers”.
If the plant uses pumps outside the machine (not supplied with the unit), the power line of each pump must be provided
with a magnetothermic switch and a control switch.
Water pump control
Connect the control contactor coil power supply to terminals 27 and 28 (pump #1) and 401 and 402 (pump 2) located on
terminal board M3, and install the contactor on a power supply having the same voltage as the pump contactor coil. The
terminals are connected to a clean microprocessor contact.
The microprocessor contact has the following commutation capacity:
Maximum voltage: 250 Vac
Maximum current: 2 A Resistive - 2 A Inductive
Reference standard: EN 60730-1
The wiring described above allows the microprocessor to manage the water pump automatically. It is good practice to
install a clean status contact pump’s thermal-magnetic circuit breaker and to connect it in series with the flow switch.
Alarm relays –Electrical wiring
The machine has a clean-contact digital output that changes state whenever an alarm occurs in one of the refrigerant
circuits. Connect this signal to an external visual, sound alarm or to the BMS in order to monitor its operation. See the
machine’s wiring diagram for wiring.
Unit On/Off remote control –Electrical wiring
The machine has a digital input that allows remote control. A startup timer, a circuit breaker or a BMS can be connected
to this input. Once the contact has been closed, the microprocessor launches the startup sequence by first turning on the
water pump and then the compressors. When the contact is opened the microprocessor launches the machine shutdown
sequence. The contact must be clean.
Double Setpoint –Electrical wiring
The Double Setpoint function allows to change over the unit setpoint between two predefined values in the unit controller.
An example of an application is ice production during the night and standard operation during the day. Connect a circuit
breaker or timer between terminals 5 and 21 of terminal board M3. The contact must be clean.

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External water Setpoint reset –Electrical wiring (Optional)
The machine’s local setpoint can be modified by means of an external analogue 4-20 mA signal. Once this function has
been enabled, the microprocessor allows to modify the setpoint from the set local value up to a differential of 3°C. 4 mA
corresponds to a 0°C differential, 20 mA corresponds to the setpoint plus the maximum differential.
The signal cable must be directly connected to terminals 35 and 36 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not to induce
interference with the electronic controller.
Unit limitation –Electrical wiring (Optional)
The machine’s microprocessor allows to limit the capacity by means of two separate criteria:
- >Load limitation: The load can be varied by means of a 4-20 mA external signal from a BMS.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
-Current limitation: The machine’s load can be varied by means of a 4-20 mA external signal from an external
device. In this case, current control limits must be set on the microprocessor so that the microprocessor
transmits the value of the measured current and limits it.
The signal cable must be directly connected to terminals 36 and 37 of the M3 terminal board.
The signal cable must be of the shielded type and must not be laid in the vicinity of the power cables, so as not
to induce interference with the electronic controller.
A digital input allows to enable the current limitation at the desired time. Connect the enabling switch or the
timer (clean contact) to terminals 5 and 9.
Attention: the two options cannot be enabled simultaneously. Setting one function excludes the other.
Fig. 5–User connection to the interface terminal board
LEGEND
1S Compressor Status 1 PS Power Supply
2S Compressor Status 2 Q10 Main Switch
Al Analog Inputs S.O. Setpoint Override
AO Analog Output TW1 Tower 1 Fan Step
C-3W Condenser 3-Way Valve TW2 Tower 2 Fan Step
C.L. Current Limit TW3 Tower 3 Fan Step
CFS Condensator Flow Switch TW4 Tower 4 Fan Step
CLE Current Limit Enable
CP-VFD Condenser Pump VFD
D.L. Demand Limit
DI Digital Inputs

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DO Digital Outputs
DPS Double Set Point
EF Esternal Fault
EFS Evaporator Flow Switch
EFS-1 Evaporator Flow Switch 1
EFS-2 Evaporator Flow Switch 2
GA General Alarm
KPC Condensator Water Pump
KPE-1 Evaporator Water Pump 1
KPE-2 Evaporator Water Pump 2

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Operation
Operator’s responsibilities
It is important that the operator is appropriately trained and becomes familiar with the system before operating the
machine. In addition to reading this manual, the operator must study the microprocessor operating manual and the wiring
diagram in order to understand start-up sequence, operation, shutdown sequence and operation of all the safety devices.
During the machine’s initial start-up phase, a technician authorized by the manufacturer is available to answer any
questions and to give instructions as to the correct operating procedures.
The operator is advised to keep a record of operating data for every installed machine. Another record should also be
kept of all the periodical maintenance and servicing activities.
If the operator notes abnormal or unusual operating conditions, he is advised to consult the technical service authorized
by the manufacturer.
Description of the machine
This machine, of the water condensation type, is made up of the following main components:
- Compressor: The single-screw compressor of the Fr 3200 or Fr4100 series is of the semi-hermetic
type and utilises gas from the evaporator to cool the motor and allow optimal operation
under any expected load conditions. The oil-injection lubrication system does not require
an oil pump as oil flow is ensured by the pressure difference between delivery and
suction. In addition to ensuring lubrication of ball bearings, oil injection dynamically seals
the screw, thus enabling the compression process.
- Evaporator: The direct-expansion shell and tube type evaporator is of ample size in order to ensure
optimum efficiency under all load conditions.
- Condenser: The shell and tube type condenser has external high efficiency micro fins (C4).
The liquid subcooled by the lower part of the tubes not only improves overall efficiency of
the machine but also compensates variations in heat load by adapting the refrigerant
load to all foreseen operating conditions.
- Expansion valve: The machine has a an electronic expansion valve, which is controlled by an electronic
device called a Driver that optimises its operation.
Description of the refrigeration cycle
The low-temperature refrigerant gas from the evaporator is drawn by the compressor through the electric motor, which is
cooled by the refrigerant. It is subsequently compressed and during this process the refrigerant mixes with the oil from
the oil separator.
The high-pressure oil-refrigerant mixture is introduced into the centrifuge-type high-efficiency oil separator, where the oil
is separated from the refrigerant. The oil accumulated on the bottom of the separator is forced by the pressure difference
back into the compressor while the oil-free refrigerant is sent to the condenser.
The refrigerant fluid is evenly distributed inside the condenser throughout the volume of the exchanger, and the gas in
contact with the tubes is cooled and successively starts to condense.
The condensed fluid at saturation temperature passes through the subcooling section where it looses even more heat,
increasing the efficiency of the cycle. The heat taken from the fluid during cooling, condensation and subcooling is
exchanged with that of the water passing inside the condenser tubes.
The subcooled fluid flows through the high-efficiency filter dryer and then reaches the expansion element (expansion
valve) through which a fall in pressure starts off the expansion process resulting in the vaporisation of part of the
refrigerant liquid.
The result at this point is a low-pressure and low-temperature liquid-gas mixture entering the evaporator, where it takes
the heat required for vaporisation.
When the refrigerant liquid-vapour is uniformly distributed in the direct expansion evaporator tubes, heat is exchanged
with the cooling water, thus reducing the temperature until complete evaporation, followed by superheating.
Once it has reached the superheated-vapour state, the refrigerant leaves the evaporator and is once again taken into the
compressor to repeat the cycle.

D –EIMWC00509-13EN - 18/48
WL1ST1
EVAPORATOR
WL2
ST2
EX8
ELECTRONIC
EXP. VALVE
EX8
ELECTRONIC
EXP. VALVE
EVAPORATOR
HEATER
WATER
INLET
WATER
OUTLET
Y5
Y6
Fig. 6- Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS DUAL Fr4 unit
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
F12-22 LP
F13-23 HP
LOW PRESSURE TRANSDUCER (0 ÷ 30 bar)
HIGH PRESSURE TRANSDUCER (0 ÷ 45 bar)
LEAVING WATER TEMPERATURE
ENTERING WATER TEMPERATURE
WH1-2
WOE
WL1-2
WIE
OIL TEMPERATURE
WD1-2
ST1-2 SUCTION TEMPERATURE

D–EIMWC00508-16EN - 19/48
Fig. 7 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS Mono Fr4 unit
WL1ST1
EVAPORATOR
EX8
ELECTRONIC
EXP. VALVE
WATER
INLET
WATER
OUTLET
Y5
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
F12-22 LP
F13-23 HP
LOW PRESSURE TRANSDUCER (0 ÷ 30 bar)
HIGH PRESSURE TRANSDUCER (0 ÷ 45 bar)
LEAVING WATER TEMPERATURE
ENTERING WATER TEMPERATURE
WH1-2
WOE
WL1-2
WIE
OIL TEMPERATURE
WD1-2
ST1-2 SUCTION TEMPERATURE

D–EIMWC00508-16EN - 20/48
Fig. 8 - Refrigeration cycle of the EWWQ B-SS / EWWQ B-XS DUAL 3200 unit
LOW PRESSURE SWITCH
HIGH PRESSURE SWITCH
F12-22 LP
F13-23 HP
LOW PRESSURE TRANSDUCER (0 ÷ 30 bar)
HIGH PRESSURE TRANSDUCER (0 ÷ 45 bar)
LEAVING WATER TEMPERATURE
ENTERING WATER TEMPERATURE
WH1-2
WOE
WL1-2
WIE
OIL TEMPERATURE
WD1-2
ST1-2 SUCTION TEMPERATURE