Daikin EWAD-C User manual

Original Instructions
REV
01
Date
04/2021
Supersedes
D-EIMAC00608-16EU
D-EIMAC00608-16EN-AR
Installation, Operation and Maintenance Manual
Air cooled screw chillers
EWAD~C
EWAD~CF
Installation, Operation and Maintenance Manual
D-EIMAC00608-16_01EN

D-EIMAC00608-16_01EN - 2/27
CONTENTS
1INTRODUCTION................................................................................................................................................ 7
1.1 Precautions against residual risks.......................................................................................................................... 7
1.2 Description.............................................................................................................................................................. 8
2RECEIVING THE UNIT...................................................................................................................................... 8
3OPERATING LIMITS......................................................................................................................................... 8
3.1 Storing Storage....................................................................................................................................................... 8
3.2 Operation ................................................................................................................................................................8
3.3 Operation with Option 187......................................................................................................................................9
4FREECOOLING UNIT VERSION.................................................................................................................... 10
4.1 Operation with Option 187....................................................................................................................................12
5MECHANICAL INSTALLATION ..................................................................................................................... 12
5.1 Safety.................................................................................................................................................................... 12
5.2 Noise..................................................................................................................................................................... 12
5.3 Moving and lifting..................................................................................................................................................13
5.4 Positioning and assembly..................................................................................................................................... 13
5.5 Minimum space requirements............................................................................................................................... 14
5.6 Multiple chiller installed side by side in a free field with dominant wind. .............................................................. 15
5.7 Multiple chiller installed side by side in a compound............................................................................................ 15
5.8 Sound protection................................................................................................................................................... 16
5.9 Water piping.......................................................................................................................................................... 16
5.10 Water treatment ............................................................................................................................................... 17
5.11 Evaporator and recovery exchangers anti-freeze protection...........................................................................18
5.12 Installing the flow switch................................................................................................................................... 18
5.13 Heat recovery...................................................................................................................................................18
6ELECTRICAL INSTALLATION....................................................................................................................... 19
6.1 General specifications .......................................................................................................................................... 19
6.2 Electrical supply.................................................................................................................................................... 19
6.3 Electric connections..............................................................................................................................................19
6.4 Cable requirements .............................................................................................................................................. 20
6.5 Phase unbalance..................................................................................................................................................20
7OPERATION.................................................................................................................................................... 21
7.1 Operator’s responsibilities ....................................................................................................................................21
8MAINTENANCE............................................................................................................................................... 21
8.1 Routine maintenance............................................................................................................................................21
8.2 Unit Maintenance and Cleaning............................................................................................................................ 24
8.3 Inverter Electrolytic Capacitors.............................................................................................................................24
9SERVICE AND LIMITED WARRANTY........................................................................................................... 24
10 IMPORTANT INFORMATION REGARDING THE REFRIGERANT USED.................................................... 25
10.1 Factory and Field charged units instructions ...................................................................................................25
11 PERIODIC CHECKS AND COMMISSIONING OF PRESSURE EQUIPMENT.............................................. 26
12 DISPOSAL....................................................................................................................................................... 26
LIST OF FIGURES
Figure 1 - Typical refrigerant circuit.............................................................................................................................. 3
Figure 2 - Typical refrigerant circuit with heat recovery................................................................................................4
Figure 3 - Description of the labels applied to the electrical panel............................................................................... 6
Figure 4 - Operating limits for standard units ...............................................................................................................9
Figure 5 - Operating limits with Option 187 ................................................................................................................10
Figure 6 - Freecooling system with 3 Way Valve ....................................................................................................... 11
Figure 7 - Freecooling system with 2 Way Valve ....................................................................................................... 11
Figure 8 - Operating limits with Option 187 ................................................................................................................12
Figure 9 - Lifting of the unit......................................................................................................................................... 13
Figure 10 - Minimum clearance requirements ............................................................................................................ 14
Figure 8 –Multiple Chiller Installation......................................................................................................................... 15
Figure 11 - Water piping connection for evaporator ................................................................................................... 17
Figure 12 - Water piping connection for evaporator ................................................................................................... 17

D-EIMAC00608-16_01EN - 3/27
Figure 1 - Typical refrigerant circuit
Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.

D-EIMAC00608-16_01EN - 4/27
Figure 2 - Typical refrigerant circuit with heat recovery
Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.

D-EIMAC01603-18_02EN - 5/27
LEGEND
ID
DESCRIPTION
1
Compressor
2
Discharge shut off valve
3
High-pressure transducer
4
Service port
5
High-pressure safety valve
6
Axial ventilator
7
Condenser coil
8
Load Valve
9
Liquid line isolating valve
10
Dehydration filter
11
Liquid and humidity indicator
12
Economiser solenoid valve
13
Economiser thermostatic expansion valve
14
Economiser (not available for EWAD650C-SS/SL/SR)
15
Electronic expansion valve
16
Evaporator
17
Low-pressure safety valve
18 (ST)
Suction temperature probe
19 (EP)
Low-pressure transducer
20
Suction shut off valve
21
Liquid injection shut off valve
22
Liquid injection mesh filter
23
Liquid injection solenoid valve
24 (F13)
High-pressure switch
25 (DT)
Discharge temperature sensor
26 (OP)
Oil pressure transducer
27
Water inlet connection
28 (EEWT)
Water entering temperature probe
29
Water outlet connection
30 (ELWT)
Water leaving temperature probe
31 (R5)
Evaporator heater
32
Heat recovery
33
Water inlet connection
34
Water outlet connection

D-EIMAC00608-16_01EN - 6/27
Figure 3 - Description of the labels applied to the electrical panel
Label Identification
1–Non flammable gas symbol
6–Electrical hazard symbol
2–Gas type
7–Hazardous Voltage warning
3–Unit nameplate data
8–Cable tightening warning
4–Manufacturer’s logo
9–Lifting instructions
5 –Water circuit filling warning
10 - Emergency stop

D-EIMAC01603-18_02EN- 7/27
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 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.
If you are unsure about assistance and for more information, contact an authorized representative of the manufacturer.
READ THIS MANUAL CAREFULLY BEFORE INSTALLING AND STARTING UP THE UNIT.
IMPROPER INSTALLATION COULD RESULT IN ELECTRIC SHOCK, SHORT-CIRCUIT,
LEAKS, FIRE OR OTHER DAMAGE TO THE EQUIPMENT OR INJURE TO PEOPLE.
THE UNIT MUST BE INSTALLED BY A PROFESSIONAL OPERATOR/TECHNICIAN
UNIT STARTUP HAS TO BE PERFORMED BY AUTHORIZED AND TRAINED
PROFESSIONAL
ALL ACTIVITIES HAVE TO BE PERFORMED ACCORDING TO LOCAL LAWS AND
REGULATION.
UNIT INSTALLATION AND START UP IS ABOSOLUTELY FORBIDDEN IF ALL
INSTRUCTION CONTAINED IN THIS MANUAL ARE NOT CLEAR.
IF CASE OF DOUBT CONTACT THE MANUFACTURER REPRESENTATIVE FOR ADVICE
AND INFORMATION.
1.1 Precautions against residual risks
1. install the unit according to the instructions set out in this manual
2. regularly carry out all the maintenance operations foreseen in this manual
3. wear protective equipment (gloves, eye protection, hard hat, etc.) suited to the work in hand; do not wear clothes
or accessories that can get caught or sucked in by flows of air; tie back long hair before entering the unit
4. before opening the machine panelling make sure that it is firmly hinged to the machine
5. the fins on heat exchangers and the edges of metal components and panels can cause cuts
6. do not remove the guards from mobile components while the unit is operating
7. make sure that mobile component guards are fitted correctly before restarting the unit
8. fans, motors and belts drives might be running: before entering, always wait for these to stop and take appropriate
measures to prevent them from starting up
9. the surfaces of the machine and pipes can get very hot or cold and cause the risk of scalding
10. never exceed the maximum pressure limit (PS) of the water circuit of the unit.
11. before removing parts on the pressurised water circuits, close the section of the piping concerned and drain the
fluid gradually to stabilise the pressure at the atmospheric level
12. do not use your hands to check possible refrigerant leaks
13. disable the unit from the mains using the main switch before opening the control panel
14. check that the unit has been grounded correctly before starting it
15. install the machine in a suitable area; in particular, do not install it outdoors if it is intended for use indoors
16. do not use cables with inadequate sections nor extension cord connections, even for very short periods or
emergencies
17. for units with power correction capacitors, wait 5 minutes after removing the electric power supply before
accessing the inside of the switch board
18. if the unit is equipped with compressors with integrated inverter, disconnect it from the mains and wait a minimum
of 20 minutes before accessing it to carry out maintenance: residual energy in the components, which takes at
least this length of time to dissipate, poses the risk of electrocution
19. the unit contains pressurised refrigerant gas: the pressurised equipment must not be touched except during
maintenance, which must be entrusted to qualified and authorised personnel
20. connect up the utilities to the unit following the indications set out in this manual and on the panelling of the unit
itself
21. In order to avoid an environmental risk, make sure that any leaking fluid is collected in suitable devices in
accordance with local regulations.
22. if a part needs to be dismantled, make sure it is correctly re-assembled before starting the unit
23. when the rules in force require the installation of fire-fighting systems near the machine, check that these are
suitable for extinguishing fires on electrical equipment and on the lubricating oil of the compressor and the
refrigerant, as specified on the safety data sheets of these fluids
24. when the unit is equipped with devices for venting overpressure (safety valves): when these valves are triggered,
the refrigerant gas is released at a high temperature and speed; prevent the release of gas from harming people
or objects and, if necessary, discharge the gas according to the provisions of EN 378-3 and the local regulations
in force.

D-EIMAC00608-16_01EN - 8/27
25. keep all the safety devices in good working order and check them periodically according to the regulations in force
26. keep all lubricants in suitably marked containers
27. do not store inflammable liquids near the unit
28. solder or braze only empty pipes after removing all traces of lubricant oil; do not use flames or other heat sources
in the vicinity of pipes containing refrigerant fluid
29. do not use naked flames near the unit
30. the machinery must be installedin structures protected against atmospheric discharge according to the applicable
laws and technical standards
31. do not bend or hit pipes containing pressurised fluids
32. it is not permitted to walk or rest other objects on the machines
33. the user is responsible for overall evaluation of the risk of fire in the place of installation (for example, calculation
of the fire load)
34. during transport, always secure the unit to the bed of the vehicle to prevent it from moving about and overturning
35. the machine must be transported according to the regulations in force taking into account the characteristics of
the fluids in the machine and the description of these on the safety data sheet
36. inappropriate transport can cause damage to the machine and even leaking of the refrigerant fluid. Before start-
up, the machine must be checked for leaks and repaired accordingly.
37. the accidental discharge of refrigerant in a closed area can cause a lack of oxygen and, therefore, the risk of
asphyxiation: install the machinery in a well ventilated environment according to EN 378-3 and the local
regulations in force.
38. the installation must comply with the requirements of EN 378-3 and the local regulations in force; in the case of
installations indoors, good ventilation must be guaranteed and refrigerant detectors must be fitted when
necessary.
1.2 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. The unit operazion is based on vapour compression, condensation and evaporation according
to reverse Carnot cycle.The main components are:
- Screw compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure
- Evaporator, where the low pressure liquid reqrigerant evaporates so cooling the water
- Condenser, where high pressure vapour condensate rejecting heat removed from the chilled water in the atmosphere
thanks to an air cooled heat exchanger.
- Expansion valve allowing to reduced the pressure of condensed liquid from coinsensation pressue to evaporation
pressure
2 RECEIVING THE UNIT
The unit must be inspected for any possible damage immediately upon reaching final place of installation. All components
described in the delivery note must be inspected and checked.
Should the unit be damaged, do not remove the damaged material and immediately report the damage to the transportation
company and request they inspect the unit..
Immediately report the damage to the manufacturer representative, a set of photographs are helpful in recognizing
responsibility
Damage must not be repaired before the inspection of the transportation company representative.
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.
3 OPERATING LIMITS
3.1 Storing Storage
Environmental conditions must be within the following limits:
Minimum ambient temperature : -20°C
Maximum ambient temperature : 57°C
Maximum R.H. : 95% not condensing
Storing below the minimum temperature may cause damage to components. Storing above the maximum temperature
causes opening of safety valves. Storing in condensing atmosphere may damage electronic components.
3.2 Operation
Operation for standard units is allowed within the limits mentioned in Fig. 4 and 5.
The unit must be operated with an evaporator water flow rate between 50% and 120% of nominal flow rate (at standard
operating conditions), however check with the chiller selection software the correct minimum and maximum allowed values
for the specific model.
Operation out of the mentioned limits may damage the unit.
In case of doubts contact manufacturer representative.

D-EIMAC01603-18_02EN- 9/27
Figure 4 - Operating limits for standard units
1. Standard Efficiency
2. High Efficiency
3. Premium Efficiency
4. Operation with Water and Glycol
5. In this area, the unit may operate partly. Consult performance tables
6. Operation with fan velocity adjustment only below 10°C ambient temperature
7. Operation with fans with Speedtroll only (below -10°C ambient temperature)
3.3 Operation with Option 187
The following ranges of units can operate with an extended envelope as shown in Fig. 5:
EWAD C-XS
EWAD C-PS
EWAD C-XL
EWAD C-PL

D-EIMAC00608-16_01EN - 10/27
Figure 5 - Operating limits with Option 187
Note.
The above graphic represents a guideline about the operating limits of the range. Please refer to Chiller Selection Software
(CSS) for real operating limits working conditions for each size.
4 FREECOOLING UNIT VERSION
Freecooling units have additional coils usedto pre-cool the fluid comingfrom the building and increasethe overall efficiency
by unloading the compressors until their completely stop if the environments conditions allow it. The water flow can be
diverted to the additional coils in case the outside ambient temperature drops below the return water temperature by three
way valve (or two single way valves. It depends from chiller size).
Freecooling operation can be enable by QFC switch installed in the control section of the electrical panel . Once the
Freecooling function is enabled, the unit controller manages automatically the operation of the water valves. The system
controls, also, the operation of fans maximizing the freecooling effect.
THE WATER SYSTEM MUST BE FILLED WITH THE PROPER PERCENTAGE OF WATER
AND GLYCOL.
IT IS RESPOSABILITY OF END USER TO ENSURE TO APPROPRIATE AMOUNT OF
WATER/GLYCOL PERCENTAGE.
DAMAGE OF FREECOOLING COILS CAUSED BY FREEZING IS NOT COVERED BY THE
WARRANTY.
Install field-provided flow switches with water pump interlock to sense the system water flow.
TO PREVENT DAMAGE TO THE FREECOOLING COILS AND EVAPORATOR TUBES,
INSTALL A STRAINER IN THE UNIT WATER INLET PIPING. STRAINER MUST HAVE
MAXIMUM 0,5 MM MESH

D-EIMAC01603-18_02EN- 11/27
There are two types of freecooling control system:
Figure 6 - Freecooling system with 3 Way Valve
EWAD640CF-XS/XL ÷ EWADC11CF-XS/XL - EWAD600CF-XR ÷ EWADC10CF-XR
EEWT = Water entering temperature probe
ELWT = Water leaving temperature probe
Figure 7 - Freecooling system with 2 Way Valve
EWADC12CF-XS/XL ÷ EWADC16CF-XS/XL - EWADC11CF-XR ÷ EWADC15CF-XR
EEWT = Water entering temperature probe
ELWT = Water leaving temperature probe
System change over is controlled by embedded unit controller, depending from operating conditions and unit setpoint.
Between winter and summer operation the water side pressure drops are different, consequently the chiller water
flow could be different. Evaluate that the minimum and maximum water flow, between summer and winter operation,
are inside the water flow limits (see product manual).

D-EIMAC00608-16_01EN - 12/27
4.1 Operation with Option 187
The following ranges of units can operate with an extended envelope as shown in Fig. 8
EWAD CF-XS
EWAD CF-XL
EWAD CF-XR
Figure 8 - Operating limits with Option 187
Note.
The above graphic represents a guideline about the operating limits of the range. Please refer to Chiller Selection Software
(CSS) for real operating limits working conditions for each size.
5 MECHANICAL INSTALLATION
5.1 Safety
The unit must be firmly secured to the soil.
It is essential to observe the following instructions:
−The unit can only be lifted using the lifting points marked in yellow fixed to its base.
−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.
−Sharp edges and the surface of the condenser section could cause injury. Avoid direct contact and use adeguate
protection device
−Switch off power supply, by opening the main switch, before servicing the cooling fans and/or compressors. Failure to
observe this rule could result in serious personal injury.
−Do not introduce solid objects into the water pipes while the unit is connected to the system.
−A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet.
−The unit is supplied with safety valves, that are installed both on the high-pressure and on the low-pressure sides of
the refrigerant circuit.
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.
Avoid installing the chiller in areas that could be dangerous during maintenance
operations, such as platforms without parapets or railings or areas not complying with the
clearance requirements around the chiller
5.2 Noise
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.

D-EIMAC01603-18_02EN- 13/27
If the unit is correctly installed, operated and manteined the noise emission level do not require any special protection
device to operate continuosly close to the unit without any risk.
In case of installation with special noise requirements it could be necessary to install additional sound attenuation devices.
5.3 Moving 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 following.
Use spacing bars to prevent damage to the condensation bank. Position these above the fan grills at a distance of at least
2.5 metres.
BOTH THE LIFTING ROPES AND THE SPACING BARS MUST BE STRONG ENOUGH TO
SUPPORT THE UNIT SAFELY. PLEASE CHECK THE UNIT’S WEIGHT ON THE UNIT
NAMEPLATE.
The unit must be lifted with the utmost attention and care following lifting label instructions; lift unit very slowly, keeping it
perfectly level..
5.4 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.
Figure 9 - Lifting of the unit
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.
If the uni 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.
Vertical air discharge must not be obstructed.
If the unit is surrounded by walls or obstacles of the same height as the unit, this must be installed at a distance no lower
than 2500 mm. If these obstacles are higher, the unit must be installed at a distance no lower than 3000 mm.
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.

D-EIMAC00608-16_01EN - 14/27
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 personel safety or unit reliability.
When two or more units are positioned side by side, a distance of at least 3600 mm between condenser banks is
recommended.
For further solutions, please consult manufacturer representative.
5.5 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. Figure 3 shows the minimum space
required.
Figure 10 - Minimum clearance requirements

D-EIMAC01603-18_02EN- 15/27
5.6 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 Fig. 7):
•Chiller N°1: is performing normally without any ambient over-temperature.
•Chiller N° 2: is working in a warmed ambient. The first circuit (from the left) is working with air recirculating from
Chiller 1 and the second circuit to the recirculating air from the chiller N°1 and recirculation from itself.
•Chiller N° 3: circuit on the left is working in a over-temperature ambient due to the recirculating air from the
other two chillers, circuit on the right is working quite normally.
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).
5.7 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.
Figure 11 –Multiple Chiller Installation

D-EIMAC00608-16_01EN - 16/27
5.8 Sound protection
When sound levels require special control, great care must be exercised to isolate the unit from its base by appropriately
applying anti-vibration elements (supplied as an option). Flexible joints must be installed on the water connections, as well.
5.9 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. Flow switch.
4. Manual or automatic air venting device at the system’s highest point.; drain device at the system’s 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.
Recommended maximum opening for strainer mesh is:
•0,87 mm (DX S&T)
•1,0 mm (BPHE)
•1,2 mm (Flooded)
9. Evaporator has an electrical resistance with a thermostat that ensures protection against water freezing at ambient
temperatures as low as –16°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’s performance will be lower and water pressure drops will be greater. All unit-protection
systems, such as anti-freeze, and low-pressure protection will need to be readjusted.
13.Before insulating water piping, check that there are no leaks

D-EIMAC01603-18_02EN- 17/27
Figure 12 - Water piping connection for evaporator
1. Pressure Gauge
2. Flexible connector
3. Flow switch
4. Temperature probe
5. Isolation Valve
6. Pump
7. Filter
Figure 13 - Water piping connection for evaporator
1. Pressure Gauge
2. Flexible connector
3. Temperature probe
4. Isolation Valve
5. Pump
6. Filter
5.10 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.
Dirt, scales, corrosion debrits and other 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.

D–EIMAC01603-18_02EN - 18/27
Table 1 - Acceptable water quality limits
DAE Water quality requirements
Shell&tube +
Flooded
BPHE
Ph (25 °C)
6.8 ÷ 8.4
7.5 –9.0
Electrical conductivity [μS/cm]
(25°C)
< 800
< 500
Chloride ion [mg Cl-/ l]
< 150
< 70 (HP1);
< 300 (CO2)
Sulphate ion [mg SO42- / l]
< 100
< 100
Alkalinity [mg CaCO3/ l]
< 100
< 200
Total Hardness [mg CaCO3/ l]
< 200
75 ÷ 150
Iron [mg Fe / l]
< 1
< 0.2
Ammonium ion [mg NH4+ / l]
< 1
< 0.5
Silica [mg SiO2/ l]
< 50
-
Chlorine molecular (mg Cl2/l)
< 5
< 0.5
Note: 1. Heat Pump
2. Cooling Only
5.11 Evaporator and recovery exchangers anti-freeze protection
All evaporators are supplied with a thermostatically controlled anti-freeze electrical resistance, which provides adequate
anti-freeze protection at temperatures as low as –16°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 not covered by the warranty.
5.12 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 provided with a clean contact which must be electrically connected to terminals shown in the wiring
diagram.
Flow switch has to be tune to intervene when the evaporator water flow is lower than 50% of nomila flow rate.
5.13 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
managment of condensing pressure.
To gurantee compressor operation within its envelope, units with heat recovery cannot operate with water temperature of
the heat recovery water lower than 28°C.
It is aresponsability of plant designer and chiller installer to grantee the respect of this value (e.g. using recirculating bypass
valve)

D–EIMAC01603-18_02EN - 19/27
6 ELECTRICAL INSTALLATION
6.1 General specifications
Refer to the specific wiring diagram for the unit you have bougth. 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 discrepance between wiring diagram and electrical panel/cables, please contact the manufacturer
representative.
All electrical connections to the unit must be carried out in compliance with laws and
regulations in force.
All installation, management and maintenance activities must be carried out by qualified
personnel.
There is a risk of electric shock.
This unit includes non-linear loads such as inverters, which have a natural current leakage to earth. If an Earth
Leakage Detector is installed upstream the unit, a type B device with a minimum threshold of 300 mA must be used.
Before any installation and connection works, the unit must be switched off and secured.
Since this unit includes inverters, the intermediate circuit of the capacitors remains
charged with high voltage for a short period of time after being switched off.
Do not operate to the unit before 20 minutes after the unit has been switched off.
Electrical equipment is capable of operating correctly in the intended ambient air temperature. For very hot
environments and for cold environments, additional measures are recommended (contact the manufacturer
representative).
The electrical equipment is capable of operating correctly when the relative humidity does not exceed 50 % at a
maximum temperature of +40 °C. Higher relative humidities are permitted at lower temperatures (for example 90%
at 20 °C).
Harmful effects of occasional condensation shall be avoided by design of the equipment or, where necessary, by
additional measures (contact the manufacturer representative).
This product complies with EMC 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.
6.2 Electrical supply
The electrical equipment can operate correctly with the conditions specificed below:
Voltage
Steady state voltage: 0,9 to 1,1 of nominal voltage
Frequency
0,99 to 1,01 of nominal frequency continuosly
0,98 to 1,02 short time
Armonics
Harmonic distortion not exceeding 10 % of the total r.m.s. voltage between live
conductors for the sum of the 2nd through to the 5th harmonic. An additional 2 % of the
total r.m.s. voltage between live conductors for the sum of the 6th through to the 30th
harmonic is permissible.
Voltage
unbalance
Neither the voltage of the negative sequence component nor the voltage of the zero
sequence component in three-phase supplies exceeding 3 % of the positive sequence
component
Voltage
interruption
Supply interrupted or at zero voltage for not more than 3 ms at any random time in the
supply cycle with more than 1 s between successive interruptions.
Voltage dips
Voltage dips not exceeding 20% of the peak voltage of the supply for more than one cycle
with more than 1 s between successive dips.
6.3 Electric connections
Daikin Applied Europe S.p.A. declines all responsibility for an inadequate electrical connection.
Only use copper conductors. Failure to use copper conductors could result in overheating
or corrosion at connection points and could damage the unit.
To avoid interference, all control wires must be connected separately from the power cables. Use different electrical
passage ducts for this purpose.

D-EIMAC00608-16_01EN - 20/27
Particular care must be taken when realizing wire connections to the switchbox; if not properly sealed, cable entries
may allow ingress of water into the switchbox which may cause damage to the equipment inside.
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.
Do not apply torque, tension or weight to the main switch terminals. Power line cables
must be supported by appropriate systems.
Simultaneous single and three-phase loads and phase unbalance can cause ground losses of up to 150 mA during
normal unit operation. The unit includes devices that generate higher harmonics, such as an inverter, that can
increase ground losses 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.
Make sure that the short-circuit current of the system at theinstallation pointis less then the rated short-time withstand
current (Icw); the value of Icw is indicated inside the electrical panel.
The standard equipment has to be use in TN-S earthing system; if your system is different please contact the
manufacturer representative.
6.4 Cable requirements
The cables connected to the circuit breaker must respect the insulation distance in the air and the surface 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.
Table 1 - 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
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.
6.5 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:
𝑈𝑛𝑏𝑎𝑙𝑎𝑛𝑐𝑒 % = (𝑉𝑥 −𝑉𝑚)∗100
𝑉𝑚
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:
383 +386 +392
3=387 𝑉
The unbalance percentage is: (392 −387)∗100
387 = 𝟏. 𝟐𝟗 %
less than the maximum allowed (3%).