Daikin EWAT_B Series User manual

Original instructions
REV
00
Date
June 2018
Supersedes
/
Air-cooled refrigeration units with scroll compressors
EWAT_B
Cooling capacity from 76 to 701 kW
50Hz - Refrigerant: R32
Installation, Maintenance and Operation Manual
D-EIMAC01706-18EN

D-EIMAC01706-18EN- 2/32
Contents
1INTRODUCTION ..................................................................................................................................................3
General description...............................................................................................................................................3
Information on the refrigerant used.......................................................................................................................3
Usage ...................................................................................................................................................................4
Installation information..........................................................................................................................................4
1.4.1 Additional guidelines for using equipment with R32 installed outdoors ..................................................4
1.4.2 Additional guidelines for using equipment with R32 installed in engine rooms.......................................4
2INSTALLATION....................................................................................................................................................6
Storage.................................................................................................................................................................6
Safety....................................................................................................................................................................6
Receipt of the unit.................................................................................................................................................6
Handling and lifting ...............................................................................................................................................6
Positioning and assembly .....................................................................................................................................8
Minimum space requirements..............................................................................................................................9
Noise and sound protection ................................................................................................................................11
Water circuit for the connection of the unit..........................................................................................................12
2.8.1 Water piping .........................................................................................................................................12
2.8.2 Installing the flow switch.......................................................................................................................12
2.8.3 Heat recovery.......................................................................................................................................12
Water treatment..................................................................................................................................................14
Operation limits...................................................................................................................................................14
Operating stability and minimum water content in the system ............................................................................17
Anti-freeze protection for evaporator and recovery exchangers .........................................................................18
Electric connections............................................................................................................................................18
2.13.1 Cable requirements..........................................................................................................................19
2.13.2 Interconnection cables.....................................................................................................................19
Phase unbalance................................................................................................................................................19
3OPERATOR'S REPONSIBILITIES.....................................................................................................................20
4MAINTENANCE .................................................................................................................................................21
Pressure / temperature table ..............................................................................................................................22
Routine maintenance..........................................................................................................................................22
4.2.1 Microchannel Coil Maintenance............................................................................................................22
4.2.2 Electrical Installation.............................................................................................................................23
4.2.3 Service and limited warranty.................................................................................................................23
5CHECKS FOR THE FIRST START-UP..............................................................................................................29
6IMPORTANT INFORMATION ON THE REFRIGERANT USED........................................................................30
Factory and Field charged units instructions.......................................................................................................30
7PERIODIC CHECKS AND COMMISSIONING OF PRESSURE EQUIPMENT..................................................31
8DISMISSION AND DISPOSAL...........................................................................................................................31
9DURATION.........................................................................................................................................................31
LIST OF FIGURES
Fig. 1–Lifting instructions....................................................................................................................................................7
Fig. 2 - Unit levelling............................................................................................................................................................9
Fig. 3 - Minimum space requirements...............................................................................................................................10
Fig. 4 –Multiple Chiller Installation....................................................................................................................................11
Fig. 5 –Hydraulic diagram without pump(s) on board.......................................................................................................13
Fig. 6–Hydraulic diagram with pump(s) on board (opt. 78÷81).........................................................................................13
Fig. 7 - Hydraulic scheme with hydronic kit (opt.134÷137)................................................................................................13
Fig. 8 - Multi V-Silver Operational limits............................................................................................................................14
Fig. 9 - Multi V-Gold Operational limits..............................................................................................................................15
Fig. 10 - Single V-Silver Operational limits........................................................................................................................16
Fig. 11 - Single V-Gold Operational limits .........................................................................................................................16
Fig. 12 - Refrigerant circuit diagram (P & ID) single circuit unit.........................................................................................26
Fig. 13 - Refrigerant circuit diagram (P & ID) double circuit unit........................................................................................27
Fig. 14 - Description of labels applied on the electrical panel............................................................................................28
LIST OF TABLES
Table 1 - Acceptable water quality limits...........................................................................................................................14
Table 2 - Evaporator - Fouling factor................................................................................................................................17
Table 3 - Air heat exchanger - Altitude correction factor...................................................................................................17
Table 4 - Minimum percentage of glycol for the low air ambient temperature..................................................................17
Table 5 - Table 1 of EN60204-1 Point 5.2.........................................................................................................................19
Table 6 - Pressure / Temperature of the R32....................................................................................................................22
Table 7 –Standard Routine Maintenance Plan.................................................................................................................24
Table 8 –Routine Maintenance Plan for Critical Application and/or Highly Aggressive Environment................................25
Table 9 - Checks to be performed before starting the unit ................................................................................................29

D-EIMAC01706-18EN - 3/32
1 INTRODUCTION
This manual provides information on the standard functions and procedures of all units in the series and is an important
supporting document for qualified personnel, but can never replace it.
All units are delivered with wiring diagrams, certified drawings, nameplate; and DOC (Declaration Of Conformity);
these documents show all technical data for the unit you have bought. In case of any discrepancies between the contents
of the manual and the documentation provided with the unit, always rely on the unit because it is an integral part of this
manual.
Read this manual carefully before installing and starting up the unit.
Improper installation could result in electric shock, short-circuits, leaks, fire or other damage to the equipment or injure to
people.
The unit must be installed by professional operators / technicians in compliance with the laws in force in the country of
installation.
The start up of the unit must also be performed by authorized and trained personnel and all activities must be carried out
in compliance, in full compliance with local laws and regulations.
INSTALLATION AND START UP ARE ABOSOLUTELY FORBIDDEN IF ALL INSTRUCTIONS CONTAINED IN THIS
MANUAL ARE NOT CLEAR.
If you are unsure about assistance and for more information, contact an authorized representative of the manufacturer.
General description
The unit you bought is an “air cooled chiller”, a machine aimed to cool water (or water-glycol mixture) within the limits
described in the following manual. The operation of the unit is based oncompression, vapor condensation and subsequent
evaporation, according to the inverse Carnot cycle. The main components are:
- A scroll compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure;
- A condenser, where high pressure vapour condensate rejecting heat removed from the chilled water in the
atmosphere thanks to an air cooled heat exchanger;
- An expansion valve allowing to reduce the pressure of condensed liquid from condensation pressure to
evaporation pressure;
- An evaporator, where the low pressure liquid refrigerant evaporates to cool the water.
All units are fully assembled in the factory and tested before shipping. The EWAT_B range consists of models with a single
refrigerant circuit (from 76 to 350 kW) and models with a double refrigerant circuit (from 150 to 701 kW).
The machine uses R32 refrigerant fluid suitable for the entire field of application of the machine.
The controller is pre-wired, set up and tested at the factory. Only normal field connections such as piping, electrical
connections and pump interlocks are required, simplifying installation and increasing reliability. All safety and operation
control systems are installed at the factory in the control panel.
The instructions in this manual are applicable to all models in this series unless otherwise specified.
Information on the refrigerant used
This product contains R32 refrigerant that has a minimal environmental impact, thanks to its low value of Global Warming
Potential (GWP).
According to ISO 817, R32 refrigerant is classified as A2L, which is slightly flammable, since the flame propagation rate is
low, and non-toxic.
R32 refrigerant can burn slowly when all the following conditions are present:
The concentration is between the lower and upper flammability limit (LFL & UFL).
T Wind velocity<propagation of flame velocity
Energy of the ignition source>Minimum ignition energy
But pose no risk under the normal usage conditions for air-conditioning equipment and work environment.

D-EIMAC01706-18EN- 4/32
Physical characteristics of R32 refrigerant
Safety class (ISO 817)
A2L
PED Group
1
Practical limit (kg/m3)
0.061
ATEL/ ODL (kg/m3)
0.30
LFL (kg/m3) @ 60°C
0.307
Vapour density @25°C, 101.3 kPa (kg/m3)
2.13
Molecular mass
52.0
Boiling point (° C)
-52
GWP (100 yr ITH)
675
GWP (ARS 100 yr ITH)
677
Autoignition temperature (° C)
648
Usage
EWAT_B units are designed and built for cooling buildings or industrial processes. The first commissioning on the final
plant must be carried out by Daikin technicians, specifically trained for this purpose. Failure to follow this start-up procedure
affects the warranty of the supply.
The standard guarantee of this equipment covers parts with proven defects in materials or workmanship. Materials subject
to natural consumption are not covered by warranty.
Installation information
The chiller has to be installed in open air or machinery room (location classification III).
To ensure location classification III a mechanical vent on the secondary circuit(s) has to be installed.
Local building codes and safety standards shall be followed; in absence of local codes and standards refer to EN 378-
3:2016 as a guide.
In paragraph “Additional guidelines for safe use of R32” there are provided additional informations that should be added to
the requirements of safety standards and building codes.
Additional guidelines for safe use of R32 for equipment located in the open air
Refrigerating systems sited in the open air shall be positioned to avoid leaked refrigerant flowing into a building or otherwise
endangering people and property.
The refrigerant shall not be able to flow into any ventilation fresh air opening, doorway, trap door or similar opening in the
event of a leak. Where a shelter is provided for refrigerating equipment sited in the open air it shall have natural or forced
ventilation.
For refrigeration systems installed outside in a location where a release of refrigerant can stagnate e.g. below ground, then
the installation shall comply with the requirements for gas detection and ventilation of machinery rooms.
Additional guidelines for safe use of R32 for equipment located in a machinery room
When a machinery room is chosen for the location of the refrigerating equipment it shall be located in accordance with
local and national regulations. The following requirements (according to EN 378-3:2016) can be used for the assessment.
A risk analysis based on the safety principle for a refrigeration system (as determined by the manufacturer and
including the charge and safety classification of the used refrigerant) should be conducted to determine if it is
necessary to install the chiller in a separate refrigeration machinery room.
Machinery rooms should not be used as occupied spaces. The building owner or user shall ensure that access
is permitted only by qualified and trained personnel doing the necessary maintenance to the machinery room or
general plant.
Machinery rooms shall not be used for storage with the exception of tools, spare parts and compressor oil for the
installed equipment. Any refrigerants, or flammable or toxic materials shall be stored as required by national
regulations.
Open (naked) flames shall not be permitted in machinery rooms, except for welding, brazing or similar activity
and then only provided the refrigerant concentration is monitored and adequate ventilation is ensured. Such open
flames shall not be left unattended.
A remote switching (emergency type) for stopping the refrigerating system shall be provided outside the room
(near the door). A similar acting switch shall be located at a suitable location inside the room.
All piping and ducting passing throught floors, ceiling and walls of machinery room shall be sealed.
Hot surfaces shall not exceed a temperature of 80 % of the auto-ignition temperature (in °C) or 100 K less than
the auto-ignition temperature of the refrigerant, whichever is lower.
Refrigerant
Self-ignition temperature
Maximum surface temperature
R32
648 °C
548°C

D-EIMAC01706-18EN - 5/32
Machinery rooms shall have doors opening outward and sufficient in number to ensure freedom for persons to
escape in an emergency; the doors shall be tight fitting, self-closing and so designed that they can be opened
from inside (antipanic system).
Special machinery rooms where the refrigerant charge is above the practical limit for the volume of the room shall
have a door that either opens directly to the outside air or through a dedicated vestibule equipped with self-closing,
tight-fitting doors.
The ventilation of machinery rooms shall be sufficient both for normal operating conditions and emergencies.
Ventilation for normal operating conditions shall be in accordance with national regulations.
The emergency mechanical ventilation system shall be activated by a detector(s), located in the machinery room.
oThis ventilation system must be:
independent of any other ventilation system on the site.
provided with two independent emergency controls one located outside the machinery room,
and the other inside.
oThe emergency exhaust ventilation fan shall:
Be either in the air flow with the motor outside the airflow, or rated for hazardous areas
(according to the assessment).
Be located to avoid pressurization of the exhaust ductwork in the machinery room.
not cause sparks to occur if it contacts the duct material.
oAirflow of the emergency mechanical ventilation shall be at least:
  

where
V
is the air flow rate in m3/s;
m
is the mass of refrigerant charge, in kg, in the refrigerating system with the largest charge, any
part of which is located in the machinery room;
0.014
It is a conversion factor.
oMechanical ventilation shall be operated continuously or shall be switched on by the detector.
Detector shall automatically activate an alarm, start mechanical ventilation and stop the system when it triggers
The location of detectors shall be chosen in relation to the refrigerant and they shall be located where the
refrigerant from the leak will concentrate
The positioning of the detector shall be done with due consideration of local airflow patterns, accounting for
location sources of ventilation and louvers. Consideration shall also be given to the possibility of mechanical
damage or contamination.
At least one detector shall be installed in each machinery room or the occupied space being considered and/or
at the lowest underground room for refrigerants heavier than air and at the highest point for refrigerants lighter
than air.
Detectors shall be continuously monitored for functioning. In the case of a detector failure, the emergency
sequence should be activated as if refrigerant had been detected.
The pre-set value for the refrigerant detector at 30 °C or 0 °C, whichever is more critical, shall be set to 25 % of
the LFL. The detector shall continue to activate at higher concentrations.
Refrigerant
LFL
Threshold level
R32
0.307 kg/m3
0.7675 kg/m3
36000 ppm
All electrical equipment (not only the refrigerating system) shall be selected to be suitable for use in the zones
identified in the risk assessment. Electrical equipment shall be deemed to comply with the requirements if the
electrical supply is isolated when the refrigerant concentration reaches 25 % of the lower flammable limit or less.
Machinery rooms or special machinery rooms shall be clearly marked as such on the entrances to the room,
together with warning notices indicating that unauthorized persons shall not enter and that smoking, naked light
or flames are prohibited. The notices shall also state that, in the event of an emergency, only authorized persons
conversant with emergency procedures shall decide whether to enter the machinery room. Additionally, warning
notices shall be displayed prohibiting unauthorized operation of the system
The owner / operator shall keep an updated logbook of the refrigerating system.
The optional leak detector supplied by DAE with the chiller should be used exclusively to check
refrigerant leakage from the chiller itself

D-EIMAC01706-18EN- 6/32
2 INSTALLATION
Storage
In the event that it is necessary to store the unit before installation, it is necessary to observe some precautions:
- do not remove the protective plastic;
- protect the unit from dust, bad weather and any rodents;
- do not expose the unit to direct sunlight;
- do not use heat sources and / or open flames near the machine.
Although the unit is covered with a heat-shrink plastic sheet, it is not intended for long-term storage and must be removed
and replaced by tarpaulins or the like, more suitable for a longer period.
Environmental conditions must be within the following limits:
- Minimum ambient temperature : - 20 °C;
- Maximum ambient temperature : +40 °C;
- Maximum R.H. : 95% not condensing.
Storage at a temperature below the minimum can cause damage to the components, instead at a temperature above the
maximum causes the opening of the safety valves, with consequent loss of refrigerant. Storage in a humid atmosphere
may damage electrical components.
Safety
All EWAT_B machines are built in compliance with the main European Directives (Machinery Directive, Low Voltage
Directive, Electromagnetic Compatibility Directive, PED Pressure Equipment Directive); be sure to receive, together with
the documentation, also the Declaration of Conformity (DoC) of the product to the directives.
Before installation and commissioning of the machinery, the people involved in this activity must have acquired the
information necessary to perform these tasks, applying all the information gathered in this manual. In particular:
- the unit must be firmly anchored to the ground when it must not be moved;
- the unit can only be lifted using the lifting points marked in yellow fixed to its base;
- always protect operating personnel with personal protective equipment appropriate to the activities to be
performed. The individual devices commonly used are: helmet, glasses, gloves, headphones, safety shoes.
Further personal and collective protection devices must be adopted after having carried out an adequate analysis
of the specific risks in the relevant area, according to the activities to be carried out.
Receipt of the unit
Inspect the unit immediately after delivery. In particular, make sure that the machine is intact in all its parts and that there
are no deformations due to impacts. All components described in the delivery note must be inspected and checked. Should
any damage occur upon receipt of the machine, do not remove the damaged material and immediately make a written
complaint to the transport company, requesting the inspection of the unit; do not repair until inspection by the transport
company representative is carried out. Immediately report the damage to the manufacturer representative, a set of
photographs is helpful in recognizing responsibility.
The restitution of the machinery is intended as ex-factory Daikin Applied Europe S.p.A.
Daikin Applied Europe S.p.A. declines all responsibility for any damage that the machinery may suffer during transport to
the destination.
Use extreme caution when handling the unit to prevent damage to components.
Before installing the unit, check that the model and power supply voltage shown on the nameplate are correct.
Responsibility for any damage after acceptance of the unit cannot be attributed to the manufacturer.
Handling and lifting
Avoid bumping and/or jolting during loading/unloading unit from the truck and moving it. Do not push or pull the unit from
any part other than the base frame. Secure the unit inside the truck to prevent it from moving and causing damages. Do
not allow any part of the unit to fall during transportation or loading/unloading.
All units of the series are supplied with lifting points marked in yellow. Only these points may be used for lifting the unit, as
shown in the figure 2.
Use spacing bars to prevent damage to the condensation bank. Position these above the fan grills at a distance of at least
2.5 meters.
During the handling of the machine it is mandatory to provide all the devices necessary to guarantee personal safety.

D-EIMAC01706-18EN - 7/32
Unit with 4 lifting points
The drawing shows only the 6 fans version.
The lifting mode is the same regardless of the number of fans
Unit with 6 lifting points
The drawing shows only the 10 fans version.
The lifting mode is the same regardless of the number of fans.
Fig. 1–Lifting instructions

D-EIMAC01706-18EN- 8/32
Consult the dimensional drawing for the hydraulic and electrical connection of the units.
The overall dimensions of the machine, as well as the weights described in this manual, are purely
indicative.
The contractual dimensional drawing and the related electrical scheme are delivered to the customer
when ordering.
The equipment, ropes, lifting accessories and handling procedures must comply with local regulations and current
regulations.
Use only lifting hooks with locking device. The hooks must be securely fixed before handling.
The lifting ropes, hooks and spacing bars must be strong enough to support the unit safely. Please check the unit weight
on the unit nameplate.
The installer has the responsibility to ensure the selection and correct use of the lifting equipment. However, it is advisable
to use ropes with a minimum vertical capacity equal to the total weight of the machine.
The machine must be lifted with the utmost attention and care following lifting label instructions; lift the unit very slowly,
keeping it perfectly level.
Positioning and assembly
All units are designed for installation outdoors, either on balconies or on the ground, provided that the installation area is
free of obstacles that could reduce air flow to the condensers coil.
The unit must be installed on a robust and perfectly level foundation; should the unit be installed on balconies or roofs, it
might be necessary to use weight distribution beams.
For installation on the ground, a strong concrete base, at least 250 mm thickness and wider than the unit must be provided.
This base must be able to support the weight of the unit.
The unit must be installed above antivibrating mounts (AVM), rubber or spring types. The unit frame must be perfectly
levelled above the AVM.
Installation such as in the figure 3 must always be avoided. In case the AVM are not adjustable (spring type are normally
not adjustable) the flatness of the unit frame must be guaranteed by using metal plate spacers.
Before unit commissioning, the flatness must be verified by using a laser levelling device or other similar devices. The
flatness shall not be over 5 mm for units within 7 m length and 10 mm for units over 7 m.
If the unit is installed in places that are easily accessible to people and animals, it is advisable to install protection grids for
the condenser and compressor sections.
To ensure best performance on the installation site, the following precautions and instructions must be followed:
Avoid air flow recirculation;
Make sure that there are no obstacles to hamper air flow;
Make sure to provide a strong and solid foundation to reduce noise and vibrations;
Avoid installation in particularly dusty environments, in order to reduce soiling of condensers coils;
The water in the system must be particularly clean and all traces of oil and rust must be removed. A mechanical water
filter must be installed on the unit inlet piping;
avoid the refrigerant discharge from the safety valves at the installation site. If necessary, it is possible to connect them
with exhaust pipes whose cross-section and length must comply with national laws and European directives.

D-EIMAC01706-18EN - 9/32
Fig. 2 - Unit levelling
Minimum space requirements
It is fundamental to respect minimum distances on all units in order to ensure optimum ventilation to the condenser coils.
When deciding where to position the unit and to ensure a proper air flow, the following factors must be taken into
consideration:
avoid any warm air recirculation;
avoid insufficient air supply to the air-cooled condenser.
Both these conditions can cause an increase of condensing pressure, which leads to a reduction in energy efficiency and
refrigerating capacity.
Any side of the unit must be accessible for post-installation maintenance operations and vertical air discharge must not be
obstructed. Figure below shows the minimum space required.
Vertical air discharge must not be obstructed.
In case of two chillers installed in free field, minimum recommended distance between them is 3600 mm; in case of two
chillers in a row, minimum distance is 1500 mm. The pictures below show examples of recommended installations.
Should the unit be installed without observing the recommended minimum distances from walls and/or vertical obstacles,
there could be a combination of warm air recirculation and/or insufficient supply to the air-cooled condenser which could
cause a reduction of capacity and efficiency.
In any case, the microprocessor will allow the unit to adapt itself to new operating conditions and deliver the maximum
available capacity under any given circumstances, even if the lateral distance is lower than recommended, unless the
operating conditions should affect personnel safety or unit reliability.
Single V
Multi V
A
1100 mm
2200 mm
B
1100 mm
1500 mm

D-EIMAC01706-18EN- 10/32
If h<Hc→L≥ 3,0 m (multi V) / L≥ 1,8 m (single V); if h>Hc or L is lower then recommended contact your Daikin distributor
to evaluate the various possible arrangements.
Fig. 3 - Minimum space requirements
The minimum distances, reported above, ensure functionalityof the chiller in most applications. However, there are specific
situations which include multiple chiller installation; in this case the following recommendations are to be followed:
Multiple chiller installed side by side in a free field with dominant wind
Considering an installation in areas with a dominant wind from a specific direction (as shown in the following fig.):
Chiller N°1: is performing normally without any ambient over-temperature
Chiller N° 2: is working in a warmed ambient. The chiller is working with air recirculating from Chiller 1 and and
recirculation from itself.
Chiller N° 3: is working in an over-temperature ambient due to the recirculating air from the other two chillers.
In order to avoid the hot air recirculation due to dominant winds, the installation where all chillers are aligned to the dominant
wind is preferred (see figure below).
Multiple chiller installed side by side in a compound
In case of compounds with walls of the same height of the chillers or higher, the installation is not recommended. Chiller 2
and chiller 3 work with sensible higher temperature due to the enhanced recirculation. In this case special precautions
must be taken in to account according to the specific installation (eg: louvered walls, install the unit on base frame in order
to increase the height, ducts on the discharge of the fans, high lift fans, etc).
All the above cases are even more sensitive in case of design conditions close to the limits of the unit operating envelope.
NOTE: Daikin cannot be considered responsible in case of malfunctions generated by hot air recirculation or insufficient
airflow as result of improper installation if the above recommendations are ignored.

D-EIMAC01706-18EN - 11/32
Fig. 4 –Multiple Chiller Installation
Noise and sound protection
The unit is a source of noise mainly due to rotation of compressors and fans.
The noise level for each model size is listed in sales documentation.
If the unit is correctly installed, operated and maintained the noise emission level do not require any special protection
device to operate continuously close to the unit without any risk.
In cases where the installation is subject to compliance with special sound requirements, it may be necessary to use
additional noise attenuation devices, it is necessary to isolate the unit from its base with extreme care, correctly applying
the anti-vibration elements (supplied as optional). Flexible joints must be installed on the water connections, as well.

D-EIMAC01706-18EN- 12/32
Water circuit for the connection of the unit
2.8.1 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:
1. Anti-vibration mountings in order to reduce transmission of vibrations to the structures.
2. Isolating valves to isolate the unit from the water system during maintenance.
3. In order to protect the chiller, the flow switch must be protected against freezing by continuous monitoring of the water
flow in the evaporator. In most cases, on site, the flow switch is set to generate an alarm only when the water pump
turns off and the water flow drops to zero. It is recommended to adjust the flow switch in order to produce a "Water
Leakage Alarm" when the water flow reaches 50% ofthe nominal value; in this case the evaporatoris protected against
freezing and the flow switch can detect the clogging of the water filter.
4. Manual or automatic air venting device at the system highest point.; drain device at the system lowest point.
5. Neither the evaporator nor the heat recovery device must be positioned at the system’s highest point.
6. A suitable device that can maintain the water system under pressure (expansion tank, etc.).
7. Water temperature and pressure indicators to assist the operator during service and maintenance.
8. A filter or device that can remove particles from the fluid. The use of a filter extends the life of the evaporator and pump
and helps to keep the water system in a better condition. The water filter must be installed as close as possible to
the chiller, as in Figs. 6 and 7. If the water filter is installed in another part of the water system, the Installer has to
guarantee the cleaning of the water pipes between the water filter and the evaporator.
Recommended maximum opening for strainer mesh is:
0.87 mm (DX S&T)
1.0 mm (BPHE)
1.2 mm (Flooded)
9. Evaporator with an electrical resistance with a thermostat that ensures protection against water freezing at ambient
temperatures as low as -20°C.
All the other water piping/devices outside the unit must therefore be protected against freezing.
10.The heat recovery device must be emptied of water during the winter season, unless an ethylene glycol mixture in
appropriate percentage is added to the water circuit.
11.If case of unit substitution, 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 unit.
12.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 unit performance will be lower and water pressure drops will be greater. All unit-protection
systems, such as anti-freeze, and low-pressure protection will have to be readjusted.
13.Before insulating water piping,check that there are no leaks. The completehydraulic circuitmust be insulated to prevent
condensation and reduced refrigeration capacity. Protect the water pipes from frost during winter (using for example a
glycol solution or a heating cable).
14.Check that the water pressure does not exceed the design pressure of the water side heat exchangers. Install a safety
valve on the water pipe downstream of the evaporator.
2.8.2 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 unit
in the event of interrupted water flow, thus protecting the evaporator from freezing.
The manufacturer offers, as optional, a flow switch that has been selected for this purpose.
This paddle-type flow switch is suitable for heavy-duty outdoor applications (IP67) and pipe diameters in the range of 1” to
6”.
The flow switch is supplied with a clean contact that must be electrically connected to the terminals shown in the wiring
diagram.
The flow switch must be set up to intervene when the water flow of the evaporator is lower than the minimum flow declared
for the unit in question.
2.8.3 Heat recovery
Units may be optionally equipped with heat recovery system.
This system in made by a water cooled heat exchanger located on the compressors discharge pipe and a dedicated
management of condensing pressure.
To guarantee compressor operation within its envelope, units with heat recovery cannot operate with water temperature of
the heat recovery water lower than 20°C.
It is a responsibility of plant designer and chiller installer to guarantee the respect of this value (e.g. using recirculating
bypass valve).

D-EIMAC01706-18EN - 13/32
Fig. 5 –Hydraulic diagram without pump(s) on board (max. operating pressure 20 bar)
Fig. 6–Hydraulic diagram with pump(s) on board (opt. 78÷81) (max. operating pressure 6 bar)
Fig. 7 - Hydraulic scheme with hydronic kit (opt.134÷137) (max. operating pressure 6 bar)
Legend
BPHE
Plate heat exchanger
5
Pump (or pumps) in line
FS
Flow switch
6
Filling group
TT
Temperature probe
7
Safety valve (Pt= 6 bar)
2
Filter
8
Anti-vibration joint
3
Pressure Gauge
9
Electrical resistance
4
Shut-off valve

D-EIMAC01706-18EN- 14/32
Water treatment
Before putting the unit into operation, clean the water circuit.
The evaporator must not be exposed to flushing velocities or debris released during flushing. It is recommended that a
suitably sized bypass and valve arrangement is installed to allow flushing of the piping system. The bypass can be used
during maintenance to isolate the heat exchanger without disrupting flow to other units.
Any damage due to the presence of foreign bodies or debris in the evaporator will not be covered by warranty.
Dirt, scales, corrosion debris and other material can accumulate inside the heat exchanger and reduce its heat exchanging
capacity. Pressure drop 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 water characteristics.
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
Electrical conductivity [S/cm] (25°C)
800
Iron [mg Fe / l]
1.0
Chloride ion [mg Cl - / l]
200
Sulphide ion [mg S2 - / l]
0
Sulphate ion [mg SO24- / l]
200
Ammonium ion [mg NH4+/ l]
1.0
Alkalinity [mg CaCO3 / l]
100
Silica [mg SiO2/ l]
50
Operation limits
Operation out of the mentioned limits may damage the unit. In case of any doubt contact the manufacturer representative.
To ensure correct operation of the unit, the value of the water flow in the evaporator must be within the declared range for
that unit. A water flow rate much lower than the nominal value shown at the unit selection point can cause problems with
freezing, fouling and poorcontrol. A water flow much higher than the nominal valueshown at the unitselection point results
in an unacceptable loss of load and excessive erosion and vibration of the tubes which can cause them to break; refer to
the Chiller Selection Software (CSS) for the correct range of range of each unit.
Fig. 8 - Multi V-Silver Operational limits

D-EIMAC01706-18EN - 15/32
Fig. 9 - Multi V-Gold Operational limits
Amb T
Ambient air temperature
ELWT
Evaporator leaving water temperature
Ref 1
Operation with ELWT <4 ° C requires option 08 (brine) and glycol
Ref 2
Operation at ambient temperatures <10 ° C requires option 99 (fan speed modulation) or option 42 (Speedtroll)
Ref 3
Units with the "Reduced noise" configuration can increase the sound level in this area
Ref 4
Partial load operation; operation at full load may require option 142 (High ambient temperature kit)

D-EIMAC01706-18EN- 16/32
Fig. 10 - Single V-Silver Operational limits
Fig. 11 - Single V-Gold Operational limits
Amb T
Ambient air temperature
ELWT
Evaporator leaving water temperature
Ref 1
Operation with ELWT <4 ° C requires option 08 (brine) and glycol
Ref 2
Operation at ambient temperatures <10 ° C requires option 99 (fan speed modulation) or option 42 (Speedtroll)
Ref 3
Partial load operation; operation at full load may require option 142 (High ambient temperature kit)

D-EIMAC01706-18EN - 17/32
The charts shown above constitute a guideline on operating limits in the range.
Refer to the CSS selection software for the actual operating limits in the working conditions for each model.
Table 2 - Evaporator - Fouling factor
Legend:
A = Fouling factor (m2°C / kW)
B = Correction factor of the cooling capacity
C = Correction factor of the absorbed power
D = EER correction factor
Table 3 - Air heat exchanger - Altitude correction factor
Legend:
A = Altitude above sea level (m)
B = Barometric pressure (mbar)
C = Correction factor of the cooling capacity
D = Correction factor of the absorbed power
- The maximum operating altitude is 2000 m above sea level.
- Contact the factory if the unit is to be installed at altitudes between 1000 and 2000 m above sea level.
Table 4 - Minimum percentage of glycol for the low air ambient temperature
Legend:
AAT = Ambient air temperature (°C) (2)
A= Ethylene glycol (%) (1)
B= Propylene glycol (%) (1)
(1) Minimum percentage of glycol to prevent freezing of the water circuit at the indicated ambient air temperature
(2) Ambient air temperature that exceeds the operating limits of the unit.
Protection of the water circuit is necessary in the winter season, even with the unit not in operation.
Operating stability and minimum water content in the system
For the correct functioning of the machines it is important to guarantee a minimum water content inside the system, avoiding
an excessive number of compressor start-ups and stops. In fact, every time the compressor starts working, an excessive
amount of oil from the compressor enters the circulation in the refrigerant circuit and at the same time there is an increase
in the temperature of the compressor stator, generated by the inrush current of the starting. In order to avoid damage to
the compressors, the control system allows no more than 10 starts per hour. The plant where the unit is installed must
therefore ensure that the overall water content allows constant operation of the unit and consequently also greater
environmental comfort.
The minimum water content per unit can be calculated with a certain approximation using the following formula must be
calculated considering the following specifications:

D-EIMAC01706-18EN- 18/32
󰇟󰇠  
 󰇟󰇠
where:
M = minimum water content per unit, expressed in liters [l];
CC = cooling capacity (Cooling Capacity), expressed in kiloWatt [kW];
m = specific water content [l/kW].
Model
m
EWATxxxB-XXA1
5 l/kW
EWATxxxB-XXA2
2.5 l/kW
Note: The calculation formula described above takes into account several factors such as the compressor stop time and
the permissible temperature difference between turning off and restarting the last compressor. In this regard, the minimum
calculated water content refers to the operation of the machine in a normal air conditioning system. If greater stability of
operation is required, it is recommended to double the calculated water content. For the most accurate determination of
the amount of water, it is advisable to contact the system designer. In very simple systems, it may be necessary to insert
in the hydraulic circuit an inertial storage tank that allows to reach the minimum volume of water required. The insertion of
this component must guarantee the correct mixing of the water and therefore it is advisable to choose a tank that has inside
of the diaphragms dedicated for this purpose.
Anti-freeze protection for evaporator and recovery exchangers
All evaporators are supplied with a thermostatically controlled anti-freeze electrical resistance, which provides adequate
anti-freeze protection at temperatures as low as -20°C.
However, unless the heat exchangers are completely empty and cleaned with anti-freeze solution, additional methods
should also be used against freezing.
Two or more of below protection methods should be considered when designing the system as a whole:
Continuous water flow circulation inside piping and exchangers
Addition of an appropriate amount of glycol inside the water circuit
Additional heat insulation and heating of exposed piping
Emptying and cleaning of the heat exchanger during the winter season
It is the responsibility of the installer and/or of local maintenance personnel to ensure that described anti-freeze
methods are used. Make sure that appropriate anti-freeze protection is maintained at all times. Failing to follow the
instructions above could result in unit damage.
Damage caused by freezing is excluded from the warranty, therefore Daikin Applied Europe S.p.A
declines all responsibility
Electric connections
Provide an electrical circuit to connect the unit. It must be connected to the copper cables with an adequate section relative
to the plate absorption values and according to the current electrical standards.
Daikin Applied Europe S.p.A. declines all responsibility for an inadequate electrical connection.
The connections to the terminals must be made with copper terminals and cables, otherwise
overheating or corrosion may occur at the connection points with the risk of damaging the unit. The
electrical connection must be carried out by qualified personnel, in compliance with the laws in force.
There is a risk of electric shock.
The power supply to the unit must be set up in such a way that it can be switched on or off independently from that of other
system components and other equipment in general, by means of a general switch.
The electrical connection of the panel must be carried out maintaining the correct sequence of the phases. Refer to the
specific wiring diagram for the unit you have bought. Should the wiring diagram not be on the unit or should it have been
lost, please contact your manufacturer representative, who will send you a copy. In case of discrepancy between wiring
diagram and electrical panel/cables, please contact the manufacturer representative.
Do not apply torque, tension or weight to the main switch terminals. Power line cables must be
supported by appropriate systems.
To avoid interference, all control wires must be connected separately from the power cables. To do this, use several
electrical passage ducts.

D-EIMAC01706-18EN - 19/32
Simultaneous single and three-phase loads and phase unbalance can cause ground losses of up to 150 mA during normal
unit operation. If the unit includes devices that generate higher harmonics, such as an inverter or phase cut, ground losses
can increase to much higher values, about 2 A.
The protections for the power supply system must be designed according to the values mentioned above. A fuse must be
present on each phase and, where provided for by the national laws of the country of installation, a leak detector to earth.
This product complies with EMC (Electromagnetic Compatibility) standards for industrial environments. Therefore it is not
intended for use in residential areas, e.g. installations where the product is connected to a low voltage public distribution
system. Should this product need to be connected to a low voltage public distribution system, specific additional measures
will have to be taken to avoid interference with other sensitive equipment.
Before any electrical connection work to the compressor motor and / or the fans, make sure that the
system is switched off and the main switch of the unit is open. Failure to observe this rule could
result in serious personal injury.
2.13.1 Cable requirements
The cables connected to the circuit breaker must respect the insulation distance in the air and thesurface isolation distance
between the active conductors and the earth, according to IEC 61439-1 table 1 and 2, and to the local national laws.
The cables connected to the main switch must be tightened using a pair of keys and respecting the unified clamping values,
relative to the quality of the screws of the washers and nuts used.
Connect the earth conductor (yellow / green) to the PE ground terminal.
The equipotential protection conductor (earth conductor) must have a section according to table 1 of EN 60204-1 Point
5.2, shown below.
In any case, the equipotential protection conductor (earth conductor) must have a cross section of at least 10 mm2, in
accordance with point 8.2.8 of the same standard.
2.13.2 Interconnection cables
The unit cannot operate without the flow of water, thanks to the intervention of the flow switch. However, in order to have
double safety, it is mandatory to install a water pump status contact in series with the contact of the flow switch(es),
to prevent the unit from operating even without the pump starting. If the unit is operated without the flow of water, it
will cause serious damage (freezing of the evaporator).
- Clean contacts: the controller has some clean signal contacts. These contacts can be wired as indicated in the
wiring diagram. The maximum permissible current is 2 A.
- Remote inputs: in addition to the clean contacts, it is also possible to install remote inputs. For installation, refer
to the wiring diagram. Table 5 - Table 1 of EN60204-1 Point 5.2
Section of the copper
phase conductors
feeding
the equipment
S[mm2]
Minimum cross-section
of the external copper
protection conductor
Sp [mm2]
S≤ 16
16 < S≤ 35
S> 35
S
16
S/2
Phase unbalance
In a three-phase system, the excessive imbalance between the phases is the cause of the engine overheating. The
maximum permitted voltage unbalance is 3%, calculated as follows:
  󰇛 󰇜

where:
Vx = phase with greater unbalance
Vm = average of the tensions
Example: the three phases measure 383, 386 and 392 V respectively. The average is:


The unbalance percentage is: 󰇛󰇜
  
less than the maximum allowed (3%).

D-EIMAC01706-18EN- 20/32
3 OPERATOR'S REPONSIBILITIES
It is essential that the operator is appropriately trained and becomes familiar with the system before operating the unit. 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 unit 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 must keep a record of operating data for every installed unit. Another registration must also be kept for all
the periodic maintenance and assistance activities.
If the operator notes abnormal or unusual operating conditions, he is advised to consult the technical service authorized
by the manufacturer.
If the unit is switched off, the compressor heating resistors cannot be used. Once the unit is
reconnected to the mains, leave the compressor heating resistors charged for at least 12 hours before
restarting the unit.
Failure to observe this rule may cause damage to the compressors due to excessive accumulation
of liquid inside them.
This unit represents a substantial investment and deserves the attention and care to keep this equipment in good working
order.
However, during operation and maintenance it is essential to observe the following instructions:
- do not allow unauthorized and / or unqualified personnel to access the unit;
- It is forbidden to access the electrical components without having opened the unit main 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;
- Verify that all operations on the refrigerant circuit and on the components under pressure are carried out
exclusively by qualified personnel;
- The replacement of the compressors must be carried out exclusively by qualified personnel;
- Sharp edges and the surface of the condenser section could cause injury. Avoid direct contact and use
adequate protection device;
- Do not introduce solid objects into the water pipes while the unit is connected to the system;
- It is absolutely forbidden to remove all protections of moving parts.
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.
It is strongly 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;
- contact immediately emergency rescue personnel of the building or the Health Emergency Service;
- wait for the operators to arrive without leaving the injured person alone;;
- give all necessary information to the rescue operators.
Avoid installing the chiller in areas that could be dangerous during maintenance operations, such as
platforms without parapets orrailings or areasnot complying with the clearance requirements around
the chiller.