Daikin EWWD320 User manual

Installation, Operation and Maintenance Manual
Installation, Operation and Maintenance Manual
Frictionless Centrifugal Chiller
EWWD320 ÷ C10FZXS
Cooling capacity from 114 to 1048 kW
Refrigerant: R-134a
Original Instructions
Installation, Operation and Maintenance Manual
D-EIMWC00908-16EN

D-EIMWC00908-16EN - 2/52
IMPORTANT
This Manual is a technical aid and does not represent a binding offer for Daikin.
Daikin has drawn up this Manual to the best of its knowledge. The content cannot be held as explicitly or implicitly
guaranteed as complete, precise or reliable.
All data and specifications contained herein may be modified without notice. The data communicated at the moment
of the order shall hold firm.
Daikin shall assume no liability whatsoever for any direct or indirect damage, in the widest sense of the term,
ensuing from or connected with the use and/or interpretation of this Manual.
The entire content is protected by Daikin copyright.
WARNING
Before starting the installation of the unit, please read this manual carefully. Starting up the unit is absolutely
forbidden if all instructions contained in this manual are not clear.
Key to symbols
Important note: failure to respect the instruction can damage the unit or compromise functioning
Note regarding safety in general or respect of laws and regulations
Note regarding electrical safety

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Description of the labels applied to the electrical panel for
1 and 2 compressors unit
8
9
Label Identification
1–Non flammable gas symbol
6–Cable tightening warning
2–Manufacturer’s logo
7–Water circuit filling warning
3–Gas type
8–Lifting instructions
4–Electrical hazard symbol
9–Unit nameplate data
5–Hazardous Voltage warning

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Index
General information..........................................................................................................................................................6
Purpose of this manual...................................................................................................................................................6
General description ........................................................................................................................................................6
Receiving the machine...................................................................................................................................................6
Checks ...........................................................................................................................................................................6
Technical Specifications ..................................................................................................................................................8
Operating limits.................................................................................................................................................................9
Storage...........................................................................................................................................................................9
Operation........................................................................................................................................................................9
Mechanical installation...................................................................................................................................................11
Shipping .......................................................................................................................................................................11
Responsibility ...............................................................................................................................................................11
Safety...........................................................................................................................................................................11
Moving and lifting..........................................................................................................................................................11
Positioning and assembly.............................................................................................................................................12
Minimum space requirements ......................................................................................................................................12
Ventilation.....................................................................................................................................................................13
Sound protection ..........................................................................................................................................................13
Vessel Drains at Start-up..............................................................................................................................................13
Connections .................................................................................................................................................................13
Water piping .................................................................................................................................................................13
Water treatment............................................................................................................................................................14
Evaporator exchangers anti-freeze protection..............................................................................................................14
Loss of flow protection..................................................................................................................................................15
Cooling Towers.............................................................................................................................................................15
Refrigerating circuit safety valves.................................................................................................................................20
Electrical installation ......................................................................................................................................................21
General specifications..................................................................................................................................................21
Electrical components ..................................................................................................................................................22
Power Wiring................................................................................................................................................................22
Field Wiring Diagram Notes..........................................................................................................................................24
Control Wiring...............................................................................................................................................................24
VFD Line Harmonics ....................................................................................................................................................24
Current Harmonics .......................................................................................................................................................24
Voltage Harmonics.......................................................................................................................................................24
Line Reactors ...............................................................................................................................................................24
Harmonic Filter.............................................................................................................................................................25
EMI (Electro Magnetic Interference) and RFI (Radio Frequency Interference) Filter....................................................25
EMI...............................................................................................................................................................................25
RFI................................................................................................................................................................................25
System Pumps .............................................................................................................................................................25
Multiple Chiller Setup....................................................................................................................................................25
Communication Setup..................................................................................................................................................25
MicroTech II Operator Interface Touch Screen (OITS) Settings...................................................................................27
Operating Sequence.....................................................................................................................................................27
Operation.........................................................................................................................................................................28
Operator’s responsibilities ............................................................................................................................................28
Compressor Operation.................................................................................................................................................28
System Water Volume..................................................................................................................................................28
Variable Speed Pumping..............................................................................................................................................28
MicroTech II Control.....................................................................................................................................................28
Use with On-Site Generators........................................................................................................................................29
Unit description.............................................................................................................................................................29
Description of the refrigeration cycle ............................................................................................................................30
Compressor..................................................................................................................................................................33
Pre-startup checks..........................................................................................................................................................35
General.........................................................................................................................................................................35
Electrical power supply.................................................................................................................................................36
Unbalance in power supply voltage..............................................................................................................................36
Prestart System Checklist ............................................................................................................................................37
Operation.........................................................................................................................................................................38
Capacity Control System..............................................................................................................................................38
Surge and Stall.............................................................................................................................................................38
Normal Unit Startup/Shutdown.....................................................................................................................................38
Shutdown............................................................................................................................................................38
Startup ................................................................................................................................................................38

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Start/Stop Switching............................................................................................................................................38
Annual Unit Startup/Shutdown .....................................................................................................................................39
Annual Shutdown................................................................................................................................................39
Annual Startup ....................................................................................................................................................39
Operating parameters.........................................................................................................................................39
System maintenance.......................................................................................................................................................41
General.........................................................................................................................................................................41
Compressor maintenance ............................................................................................................................................41
Routine maintenance....................................................................................................................................................42
Refrigerant charge........................................................................................................................................................42
Procedure to replenish refrigerant................................................................................................................................44
Standard checks .............................................................................................................................................................45
Temperature and pressure sensors..............................................................................................................................45
Test sheet ........................................................................................................................................................................46
Water side measurements............................................................................................................................................46
Refrigerant side measurements ...................................................................................................................................46
Electrical measurements..............................................................................................................................................46
Service and limited warranty..........................................................................................................................................47
Periodic obligatory checks and starting up of appliances under pressure...............................................................47
Important information regarding the refrigerant used.................................................................................................47
Disposal........................................................................................................................................................................47
Index of tables
Table 1 - Acceptable water quality limits......................................................................................................................14
Table 2 - Electrical data...............................................................................................................................................21
Table 3 -Pwer wiring recommended fuses and cables…………………………………………………………………….. 22
Table 4 - Electrical data...............................................................................................................................................26
Table 5 - Typical working conditions with unit at 100% ...............................................................................................39
Table 6 - Routine maintenance programme ................................................................................................................42
Table 7 - Pressure/ Temperature.................................................................................................................................44
Index of figures
Figure 1 - Operating limits ...........................................................................................................................................10
Figure 2 - Lifting the unit..............................................................................................................................................12
Figure 3 - Water piping connection for evaporator and condenser..............................................................................14
Figure 4 - Evaporator pressure drop.....................................................................................................................16-167
Figure 5 - Condenser pressure drop.....................................................................................................................18-189
Figure 6 –Field wiring diagram .................................................................................................................................223
Figure 7 –Field wiring diagram ...................................................................................................................................26
Figure 8 –Unit main componets..................................................................................................................................29
Figure 9 - Refrigeration cycle.......................................................................................................................................31
Figure 10 –Turbocor compressor ...............................................................................................................................33
Figure 11 –Turbocor shaft and magnetic bearing.......................................................................................................33
Figure 12 –Compressor overview...............................................................................................................................34

D-EIMWC00908-16EN - 6/52
General information
WARNING
The units described in the present manual represent a high value investment, maximum care should be taken to
ensure correct installation and appropriate working conditions.
Installation and maintenance must be performed by qualified and specifically trained personnel only.
Correct maintenance of the unit is indispensable for its safety and reliability. Manufacturer’s service centres are the
only having adequate technical skill for maintenance.
WARNING
This manual provides information about the features and standard procedures for the complete series.
All the units are delivered from factory as complete sets which include wiring diagrams, dimensional drawings with
dimensions and weight, unit label with technical characteristics attached to the unit.
WIRING DIAGRAMS, DIMENSIONAL DRAWINGS AND UNIT LABEL MUST BE CONSIDERED ESSENTIAL
DOCUMENTS AND AS A PART OF THIS MANUAL
In case of any discrepancy between this manual and the equipment’s document refer to on board documents.
For any doubt ask Daikin or authorized centers
Compressor manuals may may be downloaded from turbocor website www.turbocor.com
Compressor manuals are relevant documents to complete the information contained in this document
Purpose of this manual
The purpose of this manual is to allow the installer and the qualified operator to carry out required operations in order to
ensure proper installation and maintenance of the machine, without any risk to people, animals and/or objects.
This manual is an important supporting document for qualified and trained personnel but it is not intended to replace
such personnel.
All activities must be carried out in compliance with local laws and regulations.
General description
EWWD Frictionless Centrifugal Chillers are complete, self-contained, automatically controlled, fluid-chilling units featuring
oil-free, magnetic bearing compressors. Each unit is completely assembled and factory tested before shipment.
Magnitude chillers are equipped with one or two compressors operating in parallel with a single evaporator and single
condenser.
The chillers use refrigerant R-134a that operates at a positive pressure over the entire operation range, so no purge
system is required.
The controls are pre-wired, adjusted and tested. Only normal field connections such as water piping, relief valve piping,
electric power and control interlocks are required, thereby simplifying installation and increasing reliability. Necessary
equipment protection and operating controls are included.
All chillers are factory-tested prior to shipment and must be commissioned by a trained service technician. Failure to
follow this startup procedure can affect the equipment warranty.
Receiving the machine
The machine must be inspected for any possible damage immediately upon reaching its final place of installation. All
components described in the delivery note must be carefully inspected and checked; any damage must be reported to
the carrier. Before connecting the machine to earth, check that the model and power supply voltage shown on the
nameplate are correct. Responsibility for any damage after acceptance of the machine cannot be attributed to the
manufacturer.
Checks
To prevent the possibility of incomplete delivery (missing parts) or transportation damage, please perform the following
checks upon receipt of the machine:
a) Before accepting the machine, please verify shipment documensts and chechs the number of shipped items
b) Check every single component in the consignment for missing parts or for any damage.
c) In the event that the machine has been damaged, do not remove the damaged material. A set of photographs are
helpful in ascertaining responsibility.
d) Immediately report the extent of the damage to the transportation company and request that they inspect the
machine.

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e) Immediately report the extent of the damage to the manufacturer representative, so that arrangements can be
made for the required repairs. In no case must the damage be repaired before the machine has been inspected
by the representative of the transportation company.
Nomenclature
E W W D 3 2 0 F Z X S 0 0 1
12345678910 11 12 13 14
Machine type
EWA = Air-cooled chiller, cooling only
EWY = Air-cooled chiller, heat pump
EWL = Remote condenser chiller
ERA = Air cooled condensing unit
EWW = Water-cooled chiller, cooling only
EWC = Air-cooled chiller, cooling only with centrifugal fan
EWT = Air-cooled chiller, cooling only with heat recovery
Refrigerant
D = R-134a
P = R-407c
Q = R-410a
Capacity class in kW (Cooling)
Always 3-digit code
Model series
Letter A, B,… : major modification
Inverter
- = Non-inverter
Z = Inverter
Efficiency level
S = Standard efficiency (N.A for this range)
X = High efficiency
P = Premium efficiency (N.A for this range)
H = High ambient (N.A for this range)
Sound level
S = Standard noise
L = Low noise (N.A for this range)
R = Reduced noise (N.A for this range)
X = Extra low noise (N.A for this range)
C = Cabinet (N.A for this range)
Warranty
0 = 1 year of warranty
B = 2 years of warranty
C = 3 years of warranty
…= ... years of warranty
Sequential number
000 = Base model
001 = First order for this model (1 or more units)
002 = Second order for this model (1 or more units)
…= ... order for this model
B01 = First order for this model + 1year warranty
B02 = Second order for this model (1 or more units)
…= ... order for this model

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Technical Specifications
EWWD
320FZ
430FZ
520FZ
640FZ
660FZ
C10FZ
Cooling Capacity (1)
Min (2)
kW
114
128
172
114
128
172
Max
kW
317
429
521
635
856
1048
Capacity control
Type
---
Variable speed centrifugal compressor
Minimum capacity (1)
%
36
30
33
18
15
16
Unit power input (1)
At min capacity
kW
21.6
27.7
33.1
21.6
27.7
33.1
At max capacity
kW
65.9
85.7
104.2
132.3
171.1
205.5
EER (1)
At min capacity
---
5.3
4.6
5.2
5.3
4.6
5.2
At max capacity
---
4.8
5.0
5.0
4.8
5.0
5.0
ESEER (3)
8.4
8.6
9.2
8.6
8.5
9.3
IPLV (3)
---
8.9
9.2
9.7
9.4
9.2
9.9
Dimensions
Unit
Height
mm
1823
1823
1823
1755
1748
1794
Width
mm
1276
1276
1276
1790
1853
1904
Length
mm
3254
3254
3419
3441
3289
3401
Weight
Unit
kg
2360
2416
2546
3709
4095
4765
Operating Weight
kg
2520
2634
2812
4074
4548
5330
Evaporator
Type
---
Flooded Shell&Tube –Two water passes in standard conditions
(1 to 4 water passes available as option)
Water volume
l
Nominal water flow rate (4)
l/s
15.1
20.5
24.9
30.3
40.9
50.1
Nominal Water pressure
drop (4)
kPa
30.1
30.5
23.3
18.3
20.9
11.3
Insulation material
Closed cell
Condenser
Type
---
Flooded Shell&Tube –Two water passes in standard conditions
(1 to 4 water passes available as option)
Water volume
l
Nominal water flow rate (4)
l/s
18.3
24.6
29.9
36.7
49.1
59.9
Nominal Water pressure
drop (4)
kPa
24.3
24.5
28.2
23.7
25.3
29.3
Insulation material
None (available as an option)
Compressor
Type
---
Frictioneless Centrifugal Compressor Oil free
Sound level
Sound
Power
Cooling
dB(A)
89,0
90,1
91,2
92,4
93,6
94.6
Sound Pressure
(5)
Cooling
dB(A)
70,9
72,0
73,0
73,8
75,1
75,9
Refrigerant circuit
Refrigerant type
---
R-134a
R-134a
R-134a
R-134a
R-134a
R-134a
Refrigerant
charge
kg.
210
190
180
220
300
300
N. of
circuits
No.
1
1
1
1
1
1
Piping connections
Evaporator water inlet/outlet
mm
168.3
168.3
219.1
219.1
219.1
273.0
Condenser water inlet/outlet
mm
168.3
168.3
168.3
219.1
219.1
219.1
Safety devices
Compressors integrate safety functions such as:
- Low Suction and High Discharge Pressure
- SurgeHigh Motor Temperature
- Low Motor Current
- Starter Fault
- Sensor Fault
- Evaporator –Condenser Water Flow Loss
Notes (1)
Minimu and maximum capacity, unit power input EER are based on the following nominal conditions: evaporator water temperature 12/7°C;
condenser water temperature 30/35°C, unit at full load operation.
Notes (2)
For two compressors unit minimum capacity is with one compressor only runnin
Notes (3)
ESEER and IPLV are calculated with 100% load equal to maximum capacity
Notes (4)
Nominal flow rate an pressure drop are at maximum capacity with two passes heat exchangers
Notes (5)
The values are according to ISO 3744 and are referred to: evaporator water temperature 12/7°C; condenser water temperature 30/35°C, unit at full
load operation at maximum capacity

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Operating limits
Storage
The environmental conditions must be within the following limits:
Minimum ambient temperature : -20°C
Maximum ambient temperature : 50°C
Maximum R.H. : 90% not condensing
ATTENTION
Storing below the minimum temperature mentioned above may cause damage to components such as the electronic
controller and its LCD display.
WARNING
Storing above the maximum temperature may cause opening of the safety valves on the compressors’suction line.
ATTENTION
Storing in condensing atmosphere may damage the electronic components.
Operation
ATTENTION
Daikin EWWD FZ chillers are suitable for stationary installations only. For any moving or marine applications, contact
the factory.
ATTENTION
Operation limits of Frictionless Centrifugal compressor strongly depend from requested duty, so refer to selection
tool to be sure unit can operate at requested condition.
ATTENTION
The maximum operating altitude is 2,000 m above sea level.
Please contact the factory if the equipment is to be operated at altitudes of between 1,000 and 2,000 m above sea
level.
As reference only, operation limits are shown in the following figure

D-EIMWC00908-16EN - 10/52
Figure 1 - Operating limits
Other limits are:
Maximum startup evaporator inlet fluid temperature, 32°C
Maximum non-operating inlet fluid temperature, 38°C

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Mechanical installation
Shipping
The stability and the absence of any kind of deformation of the unit during shipping must be ensured. If the machine is
shipped with a wooden cross-plank on its base, this cross-plank must only be removed after the final destination has
been reached.
Responsibility
The manufacturer declines all present and future responsibility for any damage to persons, animals or things caused by
negligence of operators failing to follow the installation and maintenance instructions in this manual and/or the rules of
good technical practice.
All safety equipment must be regularly and periodically checked in accordance with this manual and with local laws and
regulations regarding safety and environment protection.
Safety
The machine must be secured to the ground.
It is essential to observe the following instructions:
-The machine can only be lifted using the lifting points indicated in Figure 2. These are the only points that can
support the entire weight of the unit.
-Do not allow unauthorised and/or unqualified personnel to access the unit.
-It is forbidden to access the electrical components without having opened the unit’s 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.
-All operations on the refrigerant circuit and on components under pressure must be carried out by qualified personnel
only.
-Replacement of a compressor must be carried out by qualified personnel only.
-Sharp edges could cause injury. Avoid direct contact.
-Switch off the unit’s power supply, by opening the main switch, before servicing the compressors. Failure to observe
this rule could result in serious personal injury.
-Avoid introducing solid objects into the water pipes while the machine is connected to the system.
-A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet.
-The machine is supplied with safety valves, that are installed both on the high-pressure and on the low-pressure
sides of the refrigerant circuit.
In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of the
on-board documentation delivered to the end user with this manual.
It is recommended to perform installation and maintenance with other people. In case of accidental injury or unease, it is
necessary to:
-keep calm
-press the alarm button if present in the installation site
-move the injured person in a warm place far from the unit and in rest position
-contact immediately emergency rescue personnel of the building or if the Health Emergency Service
-wait without leaving the injured person alone until the rescue operators come
-give all necessary information to the the rescue operators
WARNING
Before carrying out any operation on the machine, please read carefully the instruction and operating manual.
Installation and maintenance must be carried out by qualified personnel that is familiar with provisions of the law and
local regulations and has been trained properly or has experience with this type of equipment.
WARNING
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.
Moving and lifting
Avoid bumping and/or jolting during unloading from the lorry and moving the unit. Do not push or pull the machine from
any part other than the base frame. Secure the machine inside the lorry to prevent it from moving and causing damage to
the panels and to the base frame. Do not allow any part of the unit to fall during transportation or unloading, as this could
cause serious damage.

D-EIMWC00908-16EN - 12/52
All units of the series are supplied with lifting points indicated in the figure below. Only these points may be used for
lifting the unit, as shown in the following figure.
Figure 2 - Lifting the unit
This picture is for reference only. Lifting tools (bars, ropes, etc) are not supplied.
WARNING
Both the lifting ropes and the spacing bar and/or scales must be strong enough to support the machine safely. Please
check the unit’s weight on the machine’s nameplate.
The weights shown in the “Technical specifications” tables in the “Specifications” chapter refer to standard units.
Specific units might have accessories that increase overall weight.
WARNING
The unit must be lifted with the utmost attention and care. Avoid jolting when lifting and lift unit very slowly, keeping it
perfectly orizzontal.
Positioning and assembly
All units are designed for installation indoors. The machine must be installed on a robust and perfectly level foundation;
should the machine be installed on balconies or roofs, it might be necessary to use weight distribution beams.
For installation on the ground, prepare a strong cement base that is at least 250 mm wider and longer than the machine.
Also, this base must be strong enough to support the weight of the machine as stated in the technical specifications.
If the machine is installed in places that are easily accessible to people and animals, it is advisable to install protection
gratings for the compressor section.
To ensure the best possible performance on the installation site, the following precautions and instructions must be
followed:
• Make sure to provide a strong and solid foundation to reduce noise and vibration as much as possible.
•The water in the system must be particularly clean and all traces of oil or rust must be removed. A mechanical water
filter must be installed on the machine’s inlet piping.
Minimum space requirements
Every side of the machine must be accessible for all post-installation maintenance activities.
In particular, service clearance has to be provided at one end of the unit for possible removal of evaporator and/or
condenser tubes. Evaporator and condenser tubes are rolled into the tube sheets to permit replacement if necessary;
the length of the vessel must be allowed at one end (doors or removable wall sections can be utilized).
Keep a free space to allow the opening of electrical panel doors.

D-EIMWC00908-16EN - 13/52
Minimum clearance at all sides, including the top, is (1 meter); local regulation may require larger clearance.
Ventilation
The temperature of the room where the unit is placed should be always maintained between 0°C and 40°C.
Sound protection
When sound levels require special control, great care must be exercised to isolate the machine from its base by
appropriately applying anti-vibration elements (supplied as an option). Flexible joints must be installed on the water
connections, as well.
Vessel Drains at Start-up
The unit is tilted and drained of water in the factory and shipped with open drain valves in each head of the evaporator
and condenser. Be sure to close the valves prior to filling the vessel with fluid.
Connections
All evaporators and condensers come standard with groove-type nozzles for Victaulic couplings (also suitable for
welding), or optional flange connections. The installing contractor must provide matching mechanical connections of the
size and type required.
Be sure that water inlet and outlet connections match certified drawings and stenciled nozzle markings.
Evaporator is totally symmetric with respect to the vertical plane, so inlet and outlet nozzles may be exchanged; in this
case differenzial pressure switch connections have to be exchanged too.
Condenser has water inlet in the bottom nozzle and water outlet in the upper nozzle; exchanging this connection is not
allowed (it will result in strong performance degradazion, like subcooling reduction, up to real operation malfunzioning,
like flash gas at the condenser outlet, or risks to the compressor due to unsufficient motor cooling).
The water heads can be interchanged (end for end) so that the water connections can be made at either end of the unit.
If this is done, use new head gaskets and relocate the control sensors.
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 underlying structure.
2. Isolating valves to isolate the machine from the water system during service.
3. Manual or automatic air venting device at the system’s highest point.; drain device at the system’s lowest point.
Neither the evaporator nor the heat recovery device must be positioned at the system’s highest point.
4. A suitable device that can maintain the water system under pressure (expansion tank, etc.).
5. Water temperature and pressure indicators on the machine to assist the operator during service and
maintenance.
6. A filter or device that can remove foreign particles from the water before it enters the pump (in order to prevent
cavitation, please consult the pump manufacturer for the recommended type of filter). The use of a filter prolongs
the life of the pump and helps keep the water system in a better condition.
7. Another filter must be installed on the machine inlet water pipe, near the evaporator and heat recovery (if
installed). The filter prevents solid particles from entering the heat exchanger, as they could damage it or reduce
its heat exchanging capacity.
8. The shell and tube heat exchanger has an electrical resistance with a thermostat that ensures protection against
water freezing at ambient temperatures as low as –25°C. All the other water piping outside the machine must
therefore be protected against freezing.
9. 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.
10.If the machine is intended to replace another, the entire water system must be emptied and cleaned before the
new unit is installed. Regular tests and proper chemical treatment of water are recommended before starting up
the new machine.
11.In the event that glycol is added to the water system as anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the machine’s performance will be lower and water pressure drops will be greater. All
machine-protection systems, such as anti-freeze, and low-pressure protection will need to be readjusted.
Before insulating water piping, check that there are no leaks.
ATTENTION
Install a mechanical filter on the inlet to each heat exchanger. Failure to install a mechanical filter allows solid particles
and/or welding slag to enter the exchanger. Installation of a filter having a mesh size not exceeding 0,5 –1 mm is
advised.
The manufacturer cannot be held responsible for any damage to exchangers ensuing from the lack of a mechanical filter.

D-EIMWC00908-16EN - 14/52
Water treatment
Before putting the machine into operation, clean the water circuit. Dirt, scale, corrosion residue and other foreign 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 local characteristics of the
process water.
The manufacturer is not responsible for damage to or malfunctioning of equipment caused by failure to treat water or by
improperly treated water.
Figure 3 - Water piping connection for evaporator and condenser
Legend translation
Gauge
Gauge
Flexible connector
Flexible connector
Flow switch
Flow switch
Thermometer
Thermometer
Isolating valve
Isolating valve
Pump
Pump
Filter
Filter
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)
None
Sulphate ion (mg SO24- / l)
200
Ammonium ion (mg NH4+/ l)
1.0
Alkalinity (mg CaCO3 / l)
100
Silica (mg SiO2/ l)
50
Evaporator exchangers anti-freeze protection
ATTENTION
Neither the evaporator nor the condenser is self-draining and it has no heater installed. Both heat exchangers
must be protected against freezing

D-EIMWC00908-16EN - 15/52
Unless the heat exchangers are completely emptied and cleaned with anti-freeze solution, they have to be protected
against freezing.
Two or more of below protection methods should be considered when designing the system as a whole:
1. Continuous water flow circulation inside piping and exchangers
2. Addition of an appropriate amount of glycol inside the water circuit
3. Additional heat insulation and heating of exposed piping
4. Emptying and cleaning of the heat exchanger during the winter season
ATTENTION
It is the responsibility of the installer and/or of local maintenance personnel to ensure that two or more of the
described anti-freeze methods are used. Make sure that appropriate anti-freeze protection is maintained at all
times. Failure to follow the instructions above could result in damage to some of the machine’s components.
Damage caused by freezing is not covered by the warranty.
Loss of flow protection
All chiller are equipped with redundant differential pressure switches factory mounted to protect evaporator and
condenser from loss of flow
Cooling Towers
The condenser water flow rate must be checked to be sure that it conforms to the system design. A tower bypass valve,
controlled by the unit controller, is required to control the minimum condenser entering temperature. Unless the system
and chiller unit are specifically designed for them, condenser bypass or variable condenser flow is not recommended,
since low condenser flow rates can cause unstable operation and excessive tube fouling.
Cooling towers are normally selected for condenser water inlet water temperatures between 24°C and 32°C.
ATTENTION
Tower water treatment is essential for continued efficient and reliable unit operation. If not available in-house,
competent water treatment specialists should be contracted.

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Figure 4 - Evaporator pressure drop

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Figure 5 - Condenser pressure drop

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Figure 4 and 5 legend
Label
Size
Label
Size
A
320FZ
D
640FZ
B
430FZ
E
860FZ
C
520FZ
F
C10FZ

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Refrigerating circuit safety valves
Each system comes with safety valves that are installed, both on the evaporator and on the condenser.
The purpose of the valves is to release the refrigerant inside the refrigerating circuit in the event of certain malfunctions.
ATTENTION
This unit is designed for indoor installation.
Check that there is sufficient air circulation through the machine.
Possible damage from inhalation of refrigerant gases must be avoided. Avoid releasing the refrigerant into the
atmosphere.
The safety valves must be so connected to discharge outdoors. The installer is responsible for connecting the safety
valves to the discharge piping and for establishing their size.