Daikin EWWD VZ Operating and maintenance manual

Original instruction in English
REV
02
Date
December 2018
Supersedes
D-EIMWC003H02-18_01EN
WATER-COOLED WATER CHILLERS WITH VARIABLE SPEED
COMPRESSOR
EWWD - VZ
EWWH - VZ
Installation, maintenance and operating manual
D-EIMWC003H02-18_02EN

D-EIMWC003H02-18_02EN - 2/34
Contents
1INTRODUCTION.................................................................................................................................................. 7
1.1 Precautions against residual risks........................................................................................................................ 7
1.2 General Description.............................................................................................................................................. 8
1.3 Application............................................................................................................................................................ 8
1.4 Information about refrigerant R1234ze(E)............................................................................................................ 8
1.5 Safety installation ................................................................................................................................................. 9
1.5.1 Additional guidelines for safe use of R1234ze(E) for equipment located in the open air...............................9
1.5.2 Additional guidelines for safe use of R1234ze(E) for equipment located in a machinery room.....................9
2INSTALLATION ................................................................................................................................................. 11
2.1 Storage............................................................................................................................................................... 11
2.2 Receiving and handling...................................................................................................................................... 11
2.3 Lifting instructions............................................................................................................................................... 11
2.4 Positioning and assembly................................................................................................................................... 12
2.5 Shock absorbers................................................................................................................................................. 12
2.6 Anchoring ........................................................................................................................................................... 12
2.7 Water pipes ........................................................................................................................................................ 12
2.7.1 Evaporator and condenser water pipes.......................................................................................................12
2.7.2 Flow Switch.................................................................................................................................................13
2.7.3 Water treatment ..........................................................................................................................................14
2.8 Temperature limits and water flow...................................................................................................................... 15
2.8.1 Operating limits EWWD-VZ.........................................................................................................................15
2.8.2 Operating limits EWWH-VZ.........................................................................................................................16
2.9 Minimum water content in the system ................................................................................................................ 17
2.10 Evaporator freeze protection .............................................................................................................................. 18
2.11 Condenser protection and design considerations............................................................................................... 18
2.11.1 Condensation control with evaporative cooling tower.............................................................................18
2.11.2 Condensation control with well water .....................................................................................................18
2.12 Chilled water control sensor ............................................................................................................................... 19
2.13 Safety Valve ....................................................................................................................................................... 19
2.14 Open the isolation and/or shut off valves............................................................................................................ 19
2.15 Electrical connections......................................................................................................................................... 19
2.16 Phase imbalance................................................................................................................................................ 19
2.17 Control circuit...................................................................................................................................................... 20
3OPERATION...................................................................................................................................................... 20
3.1 Operator’s responsibilities .................................................................................................................................. 20
3.2 Unit description................................................................................................................................................... 21
3.3 Cooling cycle description.................................................................................................................................... 21
3.3.1 Evaporator...................................................................................................................................................21
3.3.2 Condenser...................................................................................................................................................21
3.3.3 Expansion valve..........................................................................................................................................21
3.3.4 Compressors...............................................................................................................................................21
3.3.5 Oil management system..............................................................................................................................22
3.3.6 Oil recovery system.....................................................................................................................................22
3.3.7 Electrical Control Panel...............................................................................................................................22
3.3.8 Safeties for each refrigerant circuit..............................................................................................................23
3.3.9 System safeties...........................................................................................................................................24
3.3.10 Regulation type.......................................................................................................................................24
3.3.11 Compressor alternation..........................................................................................................................24
3.3.12 High pressure condensation control.......................................................................................................24
3.3.13 High pressure mechanical safety pressure switch..................................................................................24
3.3.14 Compressor motor protection.................................................................................................................24
4MAINTENANCE................................................................................................................................................. 24
4.1 Maintenance and repair...................................................................................................................................... 24
4.2Pressure/Temperature Table.............................................................................................................................. 25
4.3 Routine maintenance.......................................................................................................................................... 26
4.3.1 Check condenser performance ...................................................................................................................26
4.3.2 Electronic expansion valve..........................................................................................................................26
4.3.3 Cooling circuit..............................................................................................................................................26
4.3.4 Refrigerant charge.......................................................................................................................................28
4.3.5 Electrical Installation....................................................................................................................................28
4.4 Cleaning and Storage......................................................................................................................................... 28
4.5 Seasonal maintenance....................................................................................................................................... 28
4.5.1 Seasonal shutdown.....................................................................................................................................29
4.5.2 Seasonal start up ........................................................................................................................................29
5SERVICE SCHEDULE....................................................................................................................................... 29
6MAINTENANCE SCHEDULE ............................................................................................................................ 29
7PRECOMMISSIONING CHECK LIST................................................................................................................ 31
8IMPORTANT INFORMATION REGARDING THE REFRIGERANT USED ....................................................... 32
8.1 Factory and Field charged units instructions...................................................................................................... 32
9PERIODIC CHECKS AND COMMISSIONING OF PRESSURE VESSELS ...................................................... 33
10 DEMOLITION AND DISPOSAL......................................................................................................................... 33

D-EIMWC003H02-18_02EN - 3/34
11 DURATION......................................................................................................................................................... 33
Figure Index
Figure 1-Description of the labels applied to the unit ................................................................................................................ 4
Figure 2-Description of the labels applied to the electric panel................................................................................................. 6
Figure 3-Lifting instructions..................................................................................................................................................... 11
Figure 4-Unit positioning......................................................................................................................................................... 12
Figure 5-Condenser control scheme with cooling tower ......................................................................................................... 18
Figure 6-Condensation control scheme with well water.......................................................................................................... 19
Figure 7- Unit interface............................................................................................................................................................ 23

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Figure 1-Description of the labels applied to the unit
Single circuit unit

D-EIMWC003H02-18_02EN - 5/34
Double circuit unit
1
Low pressure transducer
13
Oil level
2
Oil injection solenoid valve
14
VVR solenoid valve circ.1 (3.1 VR)
3
Oil flow sight glass
15
VVR solenoid valve circ.1 (2.4 VR)
4
Evaporator leaving water temperature sensor
16
VVR solenoid valve circ.1 (1.8 VR)
5
Evaporator entering water temperature sensor
17
High pressure switch
6
Air purge
18
Discharge temperature sensor
7
Water drain
19
Oil Pressure Transducer
8
Liquid line shut-off valve
20
Suction temperature sensor
9
High pressure safety valves
21
Low Pressure safety valves
10
Refrigerant charge service valve
22
Service valve
11
Oil discharge service valve
23
Jet pump valve
12
Oil line shut-off valve
24
High pressure transducer

D-EIMWC003H02-18_02EN - 6/34
Figure 2-Description of the labels applied to the electric panel
Single circuit unit
Double circuit unit
Identification of labels
1
Manufacturer’s logo
8
Lifting instructions
2
Electricity warning
9
Refrigerant
3
Shutoff valve position
10
W012 Symbol
4
Wire tightness check
11
Attention Closed Valve
5
High Voltage Danger
12
Attention
6
Transportation Label UN 2857
13
Copper Cables
7
Unit nameplate
14
Pressure Gauge Valves

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1 INTRODUCTION
This manual provides information about the capabilities and standard procedures for all units in the series and is an
important support document for qualified personnel but it is not intended to replace such personnel.
All units are supplied complete with wiring diagrams and dimensional drawings that provide information about the size and
weight of each model.
In case of discrepancies between the content of the manual and the documentation that came with the unit, always rely to
the wiring diagram and dimensional drawings because they are an integral part of this manual.
Read this manual carefully before installing and starting up the unit.
Improper installation can cause shock, short circuits, leaks, fire or other damages to the equipment or personal injury.
The unit must be installed by professionals/professional technicians in accordance with current laws of the country of
installation.
The unit must also be started by authorized and trained personnel and all activities must be conducted in accordance and in
full compliance with local standards and laws.
IF THE INSTRUCTIONS IN THIS MANUAL ARE NOT ABSOLUTELY CLEAR, DO NOT INSTALL AND/OR START UP
THE UNIT.
If in doubt, for service and further information, contact the manufacturer's authorized representative.
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 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 centrifugal 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.
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 installed in 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 machine

D-EIMWC003H02-18_02EN - 8/34
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 General Description
Daikin water chillers with screw compressor Inverters, are completely factory assembled and tested before shipment.
The machine, extremely compact, uses R134a/R1234ze(E) refrigerant suitable for the entire machine application range.
The controller is pre-wired, set and tested at the factory. Only normal connections are required on site such as piping,
electrical connections and pump interlocks, making installation easier and more reliable. All operating safety and control
systems are factory installed in the control panel.
The instructions in this manual apply to all models of this series unless otherwise indicated.
1.3 Application
The EWWD(EWWH) VZ units with single screw compressor and adjustment inverters are designed and constructed to cool
and/or heat buildings or industrial processes. Daikin technicians, specifically trained for this purpose, must start the final
system for the first time. Failure to follow this starting procedure affects the warranty.
The standard warranty covers parts of this equipment with proven defects in material or workmanship. Materials subject to
natural consumption are not, however, covered by the warranty.
The cooling towers used with Daikin units with screw compressor must be selected for a wide scope of application, as
described in the "Operating limits" section. From an energy savings point of view it is always preferable to keep the
temperature difference between the hot circuit (condenser) and the cold circuit (evaporator) to a minimum. However, it is
always necessary to verify that the machine works in the temperature range specified in this manual.
1.4 Information about refrigerant R1234ze(E)
This product can be equipped with refrigerant R1234ze(E) which has minimal impact to the environment, thanks to its low
value of Global Warming Potential (GWP). R1234ze(E) refrigerant is classified by European Directive 2014/68/EU as a
Group 2 (non-dangerous) substance, as it is nonflammable at standard ambient temperature and non-toxic. Due to this, no
special precautions are required for storage, transport and handling.
Daikin Applied Europe S.p.A. products comply with applicable European Directives and refer for unit design to product
Standard EN378:2016 and industrial Standard ISO5149. Local authorities approval should be verified referring to European
Standard EN378 and/or ISO 5149 (where R1234ze(E) is classified A2L –Mildly flammable gas).
Physical characteristics of refrigerant R1234ze (E)
Safety Class
A2L
PED Fluid Group
2
Pratical limit (kg/m3)
0.061
ATEL/ ODL (kg/m3)
0.28
LFL (kg/m3)@ 60°C
0.303
Vapour density @25°C, 101.3 kPa (kg/m3)
4.66
Molecular Mass
114.0
Normal Boling Point (°C)
-19
GWP (100 yr ITH)
7
GWP (ARS 100 yr ITH)
<1
Auto Ignition Temperature (°C)
368

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1.5 Safety installation
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 R1234ze(E)” there are provided additional informations that should be
added to the requirements of safety standards and building codes.
1.5.1 Additional guidelines for safe use of R1234ze(E) 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.
1.5.2 Additional guidelines for safe use of R1234ze(E) 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 concept for the refrigerating system (as determined by the manufacturer and
including the charge and safety classification of the refrigerant used) shall be conducted to determine whether it is
necessary to place the refrigerating system 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 higher.
Refrigerant
Auto ignition temperature
Maximum surface temperature
R1234ze
368 °C
268 °C
•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 shall 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
𝑉 = 0,014 × 𝑚23
⁄
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
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.

D-EIMWC003H02-18_02EN - 10/34
•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
Pre-set alarm
R1234ze
0,303 kg/m3
0,07575 kg/m3
16500 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-EIMWC003H02-18_02EN - 11/34
2 INSTALLATION
2.1 Storage
Should it be necessary to store the unit prior to installation, it is necessary to observe some precautions.
•Do not remove the protective plastic
•Do not leave the unit exposed to the elements
•Do not expose the unit to direct sunlight
•Do not use the machine near a heat source and/or open flame
•Keep in places where room temperature is between + 5° C to 55° C (room temperature over the maximum limit may
trigger the safety valve resulting in loss of refrigerant.
2.2 Receiving and handling
Inspect the unit immediately after delivery. In particular, make sure the machine is intact in all its parts and that there are no
deformations due to collisions. Should damages be found upon receipt, immediately file a written complaint with the carrier.
Machine returns are Ex-factory Daikin Applied Europe Spa.
Daikin Applied Europe Spa. cannot be held liable for any equipment damages incurred during transportation to the place of
destination.
The isolation of the evaporator corners, where the lifting holes are located, are shipped separately and must be assembled
on site after the unit has been permanently installed. Even the anti-vibration pads (optional) are shipped separately. Make
sure these items, if required, are delivered with the unit.
Use extreme caution when handling the unit to prevent damage to the control panel and the refrigerant pipes.
The unit must be lifted by inserting a hook in each of the four corners, where the lifting holes are located (see lifting
instructions). Distancer bars must be used along the line connecting the lifting holes to prevent damages to the electrical
panel and the compressor terminal box (see figure). Do not use any other point to lift the machine.
During the lifting phase, check that the lifting cords and/or chains do not touch the electrical panel and/or piping.
If, to move the machine, slides or shoes are used, just push the base of the machine without touching the copper and steel
pipes, compressors and/or electric panel.
Be careful not to hit, during handling, pipes, cables and installed accessories.
All the necessary devices guaranteeing personal safety must be provided during machine handling.
Refer to the dimensional drawing for hydraulic and electrical unit connections.
The overall machine dimensions, as well as the weights described in this manual, are purely
indicative.
The contract dimensional drawing and relevant wiring diagram are provided to the customer when
ordering.
2.3 Lifting instructions
Single circuit unit
Double circuit unit
Figure 3-Lifting instructions

D-EIMWC003H02-18_02EN - 12/34
1) Equipment, ropes, lifting accessories and handling procedures must comply with local regulations and legislation.
2) To lift the machine, use only the holes on the heat exchangers.
3) Any lifting points should be used during handling.
4) Use lifting hooks with closing device exclusively. The hooks must be safely secured prior to handling.
5) The ropes and hooks used must have capacity suited to the load. Check the nameplate on the unit that indicates the
machine weight.
6) The installer must correctly select and use lifting equipment. We recommend using cables with minimum vertical
capacity equal to the total machine weight.
7) The machine must be lifted slowly and well leveled. Adjust the lifting equipment, if necessary, to ensure the leveling.
2.4 Positioning and assembly
The unit must be mounted on a level cement or steel base, suitable to support the overall weight of the complete machine in
operation, and must be positioned so as to provide space for maintenance at one end of the unit, to allow the cleaning and/or
the removal of the evaporator and the condenser pipes. Refer to the figure below for the areas of respect. The condenser
and evaporator pipes are expanded inside the pipe plate to allow replacement, if necessary.
Figure 4-Unit positioning
The machine position should be designed to ensure access to all the safety and control devices. Never cover the safety
devices (safety valves, pressure switches), which, due to their importance, are subject to periodic checks. The safety valves
must be connected externally. For safety valve outlet pipe dimensions, we recommend applying harmonized standards
EN378 and EN13136.
These units include the installation of two safety valves for each exchanger, installed on change over valve, which always
maintains an active valve. Thus, both safety valves on each exchanger must be connected outside the machinery room.
These pipes must be installed so that, in case the valve opens, the discharged refrigerant flow not invest people and/or
things, or can enter the building through windows and/or other openings.
The engine room must be adequately ventilated to prevent refrigerant accumulation inside that can deprive air of the right
oxygen content that can cause asphyxiation. In this regard, we recommend the application of harmonized standard EN378-3
(Safety and Environmental Requirements - Installation and protection of persons) or equivalent.
The air contaminated by a high percentage of refrigerant (see refrigerant safety sheet), can cause
asphyxiation, loss of mobility and consciousness if inhaled. Avoid eye and skin contact.
2.5 Shock absorbers
The anti-vibration rubber mats (optional), shipped separately, should be placed under the corners of the unit (except for
special specifications). These mats provide a minimum insulation. Mats are recommended on all installations where the
transmission of vibrations can be considerable. Also install the anti-vibration joints on water pipes to reduce the stress on
pipes, vibrations and noise.
The units are shipped with refrigerant valves closed to isolate such fluids during shipment. The
valves must remain closed until such time as an authorized Daikin technician, after inspecting the
machine and checked its installation, commissions the machine.
2.6 Anchoring
After positioning, the machine must be firmly anchored to the ground or foreseen metal structure to support the machine. In
this regard, 22 mm diameter holes are included on the machine base to ensure the anchoring.
2.7 Water pipes
2.7.1 Evaporator and condenser water pipes
The condensers and evaporators are provided with grooved sleeves for Victaulic connections or optionally with flanged
connections. The installer must provide the mechanical coupling with the connections appropriately sized to the system.
Important notes regarding welding
1. If the connection flanges require welding, remove the temperature sensors from the wells, to prevent damage to the
controller electronic boards.
2. Grounding must be done correctly to avoid damage to the electronic controller.
3. Start the mechanical ventilation of machinery room for any service operation.
Some pressure couplings are included on both the inlet and outlet of the exchangers heads. These couplings control water
load loss. Water load loss and flow for condensers and evaporators are shown in the relevant product manual. To identify the
heat exchanger refer to its plate.
Unit type
A (m)
VZ Single Circuit
3.5
VZ Dual Circuit
4.5

D-EIMWC003H02-18_02EN - 13/34
Make sure that the water inlet and outlet connections agree with the dimensional drawing and the indications found on the
connections. Incorrect water pipe installation could create machine malfunctions and/or reduce performance.
NOTE
When using a hydraulic connection shared with the heating system, make sure the temperature of the water flowing into the
evaporator does not exceed the maximum allowed value. This phenomenon might cause the safety valve to open and thus
the refrigerant to discharge into the atmosphere.
The pipes, before being attached to the machine, must be supported to reduce the weight and the stress on connections. In
addition, the pipes must be adequately insulated. A water filter that can be inspected must also be installed on both inputs
(evaporator and condenser). Install shutoff valves on both heat exchangers with suitable dimensions to permit draining and
inspection without having to completely drain the system in addition to the water pressure gages.
To prevent damage to exchanger pipes, install a mechanical filter that can be inspected on each
input, able to filter solid objects greater than 1.2 mm in size
2.7.2 Flow Switch
A flow switch must be installed on the evaporator inlet pipe to ensure the correct water flow rate, before the unit is started.
Furthermore, this device shuts off the unit when water flow is interrupted, protecting the machine from the evaporator
freezing.
The flow switch must not be used as a machine control system
The absence of the flow switch on the evaporator water connection, voids the warranty for frost damage.
The evaporator and condenser are not self-draining; both must be purged
Thermometers and pressure gages must be installed on the water pipes near the heat exchangers connections.
Furthermore, breather valves must also be installed at the highest points on the pipe.
If necessary, only the evaporator water caps can be reversed. If this operation is completed, new gaskets and control
sensors have to be repositioned.
Condenser inlet and outlet water connections cannot be reversed.The particular condenser
configuration only provides optimal machine operations in countercurrent. The wrong water flow
direction in the condenser reduces the overall efficiency of the machine
Should water pump noise be excessive, we recommend using rubber insulating joints at both pump inlet and outlet. In most
cases it is not necessary to install anti-vibration joints on condenser pipe inlet and outlet but, where the noise and vibration
are critical (for example where a buried pipe passes through a wall in an inhabited area), it may be necessary.
If a cooling tower is used, a balancing valve must be installed. A temperature control system is required if the water tower is
very cold. The controller installed on the machine manages tower fan on/off or continuously manages a control vale or fan
speed controller by means of a 0-10 V DC analog signal. We recommend that you carry out the connection, allowing fan
management by the machine controller (see wiring diagram for connection).

D-EIMWC003H02-18_02EN - 14/34
2.7.3 Water treatment
Before commissioning the machine, clean the
water circuits. Make sure that the tower purge and
emptying system is operational. Atmospheric air
contains many contaminants so you need a good
water treatmentr.
The use of untreated water can result in:
corrosion, erosion, mud, fouling and formation of
algae. Daikin Applied Europe is not liable for
equipment damage or malfunction due to a lack of
a water treatment or water not properly treated.
Use industrial glycol only.
Do not use automotive antifreeze.
Automotive antifreeze contains
inhibitors which cause a plating
on copper pipes.
Used glycol handling and
disposal must be in accordance
with current regulations
Fig. 1-Water quality

D-EIMWC003H02-18_02EN - 15/34
2.8 Temperature limits and water flow
The units are designed to operate with an evaporator outlet water temperature between +4°C and +15°C and a condenser
outlet water temperature between 15° C and 50° C (standard units). However, the minimum temperature difference between
the evaporator outlet water temperature and the condenser inlet water temperature must not be less than 15° C. Always
check the exact operating point with the selection software. Some simultaneous operating conditions (high evaporator inlet
water temperature and high condenser inlet water temperature) may be inhibited.
Glycol must be used for all applications with the evaporator outlet fluid below 4° C. The maximum permissible water
temperature in the evaporator with the machine off is 50° C. Higher temperatures could cause the safety valves on the
evaporator sleeve to open. Water flow rate under the minimum value indicated in the condenser and evaporator load loss
diagram can cause freezing problems, incrustations and poor control. Water flow rate higher than the maximum value
indicated in the condenser and evaporator load loss diagram results in an unacceptable load loss and excessive erosion of
the pipes and vibrations that can cause breakage.
2.8.1 Operating limits EWWD-VZ EWWD-VZ-SS
EWWD-VZ-XS/PS

D-EIMWC003H02-18_02EN - 16/34
ELWT Evaporator outlet water temperature
CLWT Condenser outlet water temperature
Ref.1: standard unit (no options are required to operate in this area)
Ref.2a: standard unit + opt. 08 (Brine). Limit for Propylene Glycol: ELWT = 0°C
Ref.2b: standard unit + opt. 08 (Brine). Limit for Ethylene Glycol: ELWT = -3°C
Ref.2c: standard unit + opt. 174 (Low Brine). Limit for Propylene Glycol: ELWT = -8°C
Ref.3: standard unit + opt. 111 (High temperatures kit).
Ref.4a: standard unit + opt. 08 (Brine) + opt.111 (high temperature kit). Limit for Propylene Glycol: ELWT = -0°C
Ref.4b: standard unit + opt. 08 (Brine) + opt.111 (high temperature kit). Limit for Ethylene Glycol: ELWT = -3°C
Ref.4c: standard unit + opt. 174 (Low Brine) + opt.111 (high temperature kit). Limit for Propylene Glycol: ELWT = -8°C
kit plus Brine version (Option 111 + Option 08)
2.8.2 Operating limits EWWH-VZ EWWH-VZ-XS

D-EIMWC003H02-18_02EN - 17/34
EWWH-VZ-SS
Ref.1: standard unit (no options are required to operate in this area)
Ref.2a: standard unit + opt. 08 (Brine). Limit for Propylene Glycol: ELWT = 0°C
Ref.2b: standard unit + opt. 08 (Brine). Limit for Ethylene Glycol: ELWT = -6°C
Ref.2c: standard unit + opt. 08d (Low Brine). Limit for low brine Ethylene Glycol: ELWT = -8°C
Ref.3: standard unit + opt. 111 (High temperatures kit).
Ref.4a: standard unit + opt. 08 (Brine) + opt.111 (high temperature kit). Limit for Propylene Glycol: ELWT = -0°C
Ref.4b: standard unit + opt. 08 (Brine) + opt.111 (high temperature kit). Limit for Ethylene Glycol: ELWT = -6°C
Ref.4c: standard unit + opt. 08d (Low Brine) + opt.111 (high temperature kit). Limit for low brine Ethylene Glycol: ELWT = -8°C
2.9 Minimum water content in the system
For correct VZ machine operations and the necessary operating stability, it is important to ensure a minimum water content
in the system. An accumulation tank with suitable volume may be required for this purpose.
The minimum water content must be calculated by considering the following specifications:
Application
VZ single circuit
VZ Dual circuit
Conditioning
3.3 lt/kW
2.5 lt/kW
Process
6.6 lt/kW
5.0 lt/kW
Variable capacity
6.6 lt/kW
5.0 lt/kW
Calculation example:
Cooling capacity at 100% = 670 kW
Minimum system volume for conditioning: 670 x 3.3= 2211 lt
Minimum system volume for processing: 670 x 6.6= 4422 lt
Minimum system volume at variable capacity: 670 x 6.6= 4422 lt
Note: The calculation formula described above, takes into account several factors such as the compressor stop time and
the admissible temperature difference between the last compressor stop and start. In this regard, the minimum water
content calculated refers to the machine operations in a normal climate control system. If the machine is used for process
activities or if higher operating stability is required, we recommend doubling the calculated water content. In very simple
systems, an inertial accumulation tanks may be necessary on the hydraulic circuit to reach the required minimum water
volume. Adding this component must guarantee correct water mixing and, therefore, we recommend you select a tank that
includes an internal diaphragm for this purpose.
Note: If the evaporator water circuit operates in a variable flow system, the minimum water flow rate must not be less than
50% of the water flow rate at nominal conditions and the variation should not be greater than 10% of the nominal flow per
minute.

D-EIMWC003H02-18_02EN - 18/34
2.10 Evaporator freeze protection
1. If the machine is idle during the winter, drain and rinse the evaporator and chilled water pipes with glycol. Drain and air
vent connections are included on the evaporator for this purpose.
2. We recommend adding glycol in proper proportion to the condenser cooling system. The freezing temperature, of the
water-glycol solution, must be at least 6° C lower than the expected minimum ambient temperature.
3. Insulate pipes especially chilled water ones to avoid condensation.
Damage caused by freezing is not covered by warranty, therefore, Daikin Applied Europe SpA
cannot be held liable.
2.11 Condenser protection and design considerations
If lake, river or ground water is used as the cooling fluid and the water valves have a leak, the condenser and liquid
refrigerant line temperatures could drop under room temperature when the machine is off. This problem occurs when cold
water circulates through the condenser and the unit remains off waiting load. If this happens:
1. Turn off the condenser water pump when the compressor is off.
2. Check that the liquid line expansion valve is working properly.
2.11.1 Condensation control with evaporative cooling tower
The minimum condenser inlet water temperature should not be less than 20° C at full water tower flow rate.
If the water temperature must be lower, even the water flow must be reduced proportionately.
To modulate the water flow to the condenser, install a three-way by-pass valve. The figure shows how the three-way valve is
applied to cool the condenser. The three-way valve can be activated by a pressure actuator which guarantees proper
condensing pressure in the case where the water temperature entering the condenser is less than 20° C.
In place of a valve with pressure actuator you might use a three-way servo-operated valve or a circulation pump controlled
by an inverter. Both of these two devices may be controlled by an analog 0-10 Vdc signal issued by the machine's electronic
controller according to the water temperature entering the condenser.
Figure 5-Condenser control scheme with cooling tower
2.11.2 Condensation control with well water
If ground water is used to cool the condenser, install a normally regulating control valve, direct drive, at condenser outlet.
This regulating valve must ensure an adequate condensing pressure in the case where the water temperature entering the
condenser is less than 20° C.
A service valve with pressure outlet is provided on the condenser sleeve for this purpose.
The valve must modulate its opening according to condensing pressure. When the machine shuts down, the valve will close
preventing the condenser from emptying.
1
Cooling tower
2
Condenser
1
2

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Figure 6-Condensation control scheme with well water
1
From the main condenser pump
2
Service valve
3
Direct acting water regulating valve
4
Configuration required when the regulating valve is not used
5
At Drain
2.12 Chilled water control sensor
The water cooled EWWH VZ unit is equipped with a microprocessor. Be careful when working around the unit to avoid
damaging cables and sensors. Check cables before starting the unit. Prevent rubbing of the cables on the frame or other
components. Make sure the cables are securely locked. If the temperature sensor is removed for maintenance, do not
eliminate the conductive paste in the well and replace the sensor correctly. After replacing the sensor, tighten the lock nut to
prevent accidental slipping.
2.13 Safety Valve
Each exchanger (evaporator and condenser) is provided with a safety valve installed on a changeover valve that allows
maintenance and periodic checks, without losing a significant amount of refrigerant. Do not leave the safety valve in the
intermediate position.
To prevent damages due to inhalation and direct contact with refrigerant gas, the safety valve
outlets must be connected with a conveyor pipe before operations. These pipes must be installed
so that, in case the valve opens, the discharged refrigerant flow not invest people and/or things, or
can enter the building through windows and/or other openings. The installer is responsible for
connecting the safety valve to the purge pipe and pipe dimensioning. In this regard, refer to the
harmonized standard EN13136 to dimension the drain pipes to be connected to the safety valves
2.14 Open the isolation and/or shut off valves
Before powering the machine and thus starting the compressors, open all valves that were closed at the factory for shipping.
The valves to be opened are:
1. Valve (optional) installed on the compressor line
2. Oil return pipe shutoff valves (jet pump). These valves are positioned below the evaporator sleeve in the vicinity of
the jet pump.
3. Liquid line valve installed under the condenser.
4. Oil valves installed on the line that feeds the compressor lubrication system. This line comes from the bottom of the
oil separator located inside the condenser.
5. Valve (optional) installed on the compressor pump line.
2.15 Electrical connections
The unit must be connected with in the proper section copper cables relative to the plate absorption values and in
accordance with applicable electrical regulations.
Daikin Applied Europe SpA cannot be held liable for improper electrical connections.
The connections to the terminals must be made with copper terminals and cables.
The electrical connection must be made by qualified personnel.
There is a risk of electric shock
The electrical panel must be connected keeping the correct phase sequence.
2.16 Phase imbalance
In a three-phase system, excessive imbalance between the phases is the cause of motor overheating. The maximum
allowed voltage imbalance is 2%, calculated as follows:
𝐼𝑚𝑏𝑎𝑙𝑎𝑛𝑐𝑒 % = (𝑉𝑥 −𝑉𝑚)∗100
𝑉𝑚
Vx = phase with greatest imbalance
Vm = average of the voltages

D-EIMWC003H02-18_02EN - 20/34
I.e. the three phases measure 383, 386 and 392 volts respectively, the average is:
383+386+392 = 387 V
3
the percentage of imbalance is thus
(392-387) x 100 = 1,29% less than the maximum admitted (2%)
387
Before any maintenance and/or electrical connection to the compressor inverter, make sure the
system is turned off and the unit main switch open.
After turning off the main switch, wait at least 20 minutes for the inverter condensers to completely
discharge. Do not perform any maintenance and/or electrical connection in this period of time.
2.17 Control circuit
The unit control circuit is powered at 230 Vac.
The controller ON/OFF switch (Q0) must be rotated to the OFF position whenever machine operations are not required.
Water flow switch interlock terminals are included in the controller. See the wiring diagram for the correct connections on the
field.
The purpose of the water flow switch interlock is to prevent the compressor from running for enough time to let the two
evaporator and condenser water pumps to operate and ensure the correct water flow. The flow switch can be supplied on
request from Daikin Applied Europe and in any case must be compulsorily installed on the machine. For better protection
against freezing, connecting the evaporator flow switch, contactor clean contact or pump circuit breaker in series.
It is best to leave pump control to the microprocessor for better system management.
If an external system independently manages pump start, follow this logic.
Evaporator water inlet
•turn on the pump 2 minutes before enabling the machine
•turn off the pump 5 minutes after disabling the machine
Condenser water pumps:
•turn the pump on 30 seconds before enabling the machine
•turn the pump off 1 minute after the last compressor is turned off.
With the machine off, the condenser pump must always be turned off.
Testing the control circuit
Each unit is factory tested. Both the control and power circuits undergo a careful functional test before the machine is
shipped.
3 OPERATION
3.1 Operator’s responsibilities
It is important that the operator becomes familiar with the equipment before operating the machine.
In addition to reading this manual, the operator should study the operation manual and the wiring diagram supplied with the
unit to understand commissioning, operation and the shutdown sequence as well as the shutdown mode and safeties.
During initial machine start-up, the Daikin technician is available to answer any questions and instruct on proper
operating procedures.
The operator should keep an operating data log for each specific machine. Furthermore, an additional maintenance log
should be kept for periodic maintenance and service.
This Daikin unit represents a substantial investment and deserves the attention and care to keep this equipment in good
working order. If the operator observes abnormal or unusual operating conditions, calling Daikin technical service is
recommended.
In any case, it is essential to follow the instructions below during operation and maintenance:
- Do not allow unauthorized and/or unskilled 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 electrical
components if water and/or moisture are present.
- Ensure that all operations on the refrigerant circuit and on components under pressure are exclusively carried out by
qualified personnel.
- Compressors must be replaced and lubricant oil filled by qualified personnel.
- Sharp edges can cause injuries. Avoid direct contact.
- Do not introduce solid objects into the water pipes while the unit is connected to the system.
- A mechanical filter must be fitted to the water pipe connected to the heat exchanger inlet.
- The unit is equipped with high-pressure safety pressure switches on each compressor, which stop it when triggered when
the pressure exceeds the set value. If triggered, reset the pressure switches by pressing the blue button and then the alarm
on the microprocessor.
- It is absolutely forbidden to remove any protection system covering 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.