Daikin EWAD TZ User manual

D–EIMAC00907–16EN - 1/20
Inverter
Installation, Operation and Maintenance Manual
Air cooled chiller with inverter
driven screw compressor
EWAD~TZ
Refrigerant: R-134a
Original Instructions
Installation, Operation and Maintenance Manual
D–EIMAC00907-16EN

D–EIMAC00907–16EN - 2/20
A
Typical refrigerant circuit - Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.

D-EIMAC00907-16EN - 3/20
B
Typical refrigerant circuit with heat recovery - Water inlet and outlet are indicative. Please refer to the machine dimensional diagrams for exact water connections.

D-EIMAC00907-16EN - 4/20
Legend
1
Compressor
2
Evaporator
3
Condenser coil & Axial fan
4
Electronic expansion valve
5
Economizer
6
Dehydration filter
7
Liquid and humidity indicator
8
Sution valve
9
Economizer electronic expansion
valve
10
Low-pressure safety valve
11
High-pressure safety valve
12
Heat exchanger (VFD cooling)
13
Heat exchanger (VFD cooling)
solenoid valve
14
Discharge shut off valve
15
Liquid line isolating valve
16
¼” SAE Flare valve
17
Evaporator water inlet connection
18
Evaporator water outlet connection
19
2 Way charging valve
20
Heat Recovery (Optional)
21
Heat Recovery water outlet
connection
22
Heat Recovery water inlet
connection
F13-F13A
High pressure switch
DT
Discharge temperature sensor
CPT
Condenser pressure transducer
EPT
Evaporator pressure transducer
ST
Suction temperature sensor
PTeco
Economizer pressure transducer
TTeco
Economizer temperature
transducer
TTvfd
VFD Temperature transducer
EEWT
Evaporator Entering Water
Temperature probe
ELWT
Evaporator Leaving Water
Temperature probe

D–EIMAC00907–16EN - 5/20
This manual is an important supporting document for qualified personnel but it is not intended to replace such personnel.
Thank you for purchasing this chiller
READ THIS MANUAL CAREFULLY BEFORE
INSTALLING AND STARTING UP THE UNIT.
IMPROPER INSTALLATION COULD RESULT IN
ELECTRIC SHOCK, SHORT-CIRCUIT, LEAKS, FIRE
OR OTHER DAMAGE TO THE EQUIPMENT OR
INJURE TO PEOPLE.
THE UNIT MUST BE INSTALLED BY A
PROFESSIONAL OPERATOR/TECHNICIAN
UNIT STARTUP HAS TO BE PERFORMED BY
AUTHORIZED AND TRAINED PROFESSIONAL
ALL ACTIVITIES HAVE TO BE PERFORMED
ACCORDING TO LOCAL LAWS AND REGULATION.
UNIT INSTALLATION AND START UP IS
ABOSOLUTELY FORBIDDEN IF ALL INSTRUCTION
CONTAINED IN THIS MANUAL ARE NOT CLEAR.
IF CASE OF DOUBT CONTACT THE
MANUFACTURER REPRESENTATIVE FOR ADVICE
AND INFORMATION.
Description
The unit you bought is an “air cooled chiller”, a machine aimed
to cool water (or water-glycol mixture) within the limits
described in the following. The unit operation is based on
vapour compression, condensation and evaporation according
to reverse Carnot cycle. The main components are:
- Screw compressor to rise the refrigerant vapour pressure
from evaporation pressure to condensation pressure
- Evaporator, where the low pressure liquid refrigerant
evaporates to cool the water
- Condenser, where high pressure vapour condensate
rejecting heat removed from the chilled water in the
atmosphere thanks to an air cooled heat exchanger.
- Expansion valve allowing to reduced the pressure of
condensed liquid from condensation pressure to
evaporation pressure.
General Information
All units are delivered with wiring diagrams, certified
drawings, nameplate; and DOC (Declaration Of
Conformity); these documents show all technical data
for the unit you have bought and they MUST BE
CONSIDERED ESSENTIAL DOCUMENTS OF THIS
MANUAL
In case of any discrepancy between this manual and the
equipment’s documents please refer to on board documents.
In case of any doubt contact the manufacturer representative.
The purpose of this manual is to allow the installer and the
qualified operator to ensure proper installation, commissioning
and maintenance of the unit, without any risk to people,
animals and/or objects.
Receiving the unit
The unit must be inspected for any possible damage
immediately upon reaching final place of installation. All
components described in the delivery note must be inspected
and checked.
Should the unit be damaged, do not remove the damaged
material and immediately report the damage to the
transportation company and request they inspect the unit..
Immediately report the damage to the manufacturer
representative, a set of photographs are helpful in recognizing
responsibility
Damage must not be repaired before the inspection of the
transportation company representative.
Before installing the unit, check that the model and power
supply voltage shown on the nameplate are correct.
Responsibility for any damage after acceptance of the unit
cannot be attributed to the manufacturer.
Operating limits
Storing Storage
Environmental conditions must be within the following limits:
Minimum ambient temperature : -20°C
Maximum ambient temperature : 57°C
Maximum R.H. : 95% not condensing
Storing below the minimum temperature may cause damage to
components. Storing above the maximum temperature causes
opening of safety valves. Storing in condensing atmosphere
may damage electronic components.
Operation
Operation is allowed within the following limits:
Evaporator Leaving Water Temperature: 4…18°C (Cool
Mode), -8…18°C (Cool with glycol, Ice Mode)
Outside Ambient Temperature @ full load:
Silver Efficiency Version: 10…47°C
Gold Efficiency Version: -18…50°C
Platinum Efficiency Version: -18…52°C
Operational envelope can be extended through selection of
specific options (such as high ambient kit, brine version, etc)
which allow the unit to operate down to -8°C evaporator
leaving temperature and/or up to 52°C ambient temperature at
full load.
The above mentioned values represent a guideline, please
refer to the chiller selection software for real operating limits for
the specific model.
As a general rule, The unit should be operated with an
evaporator water flow rate between 50% and 140% of nominal
flow rate (at standard operating conditions), however check
with the chiller selection software the correct minimum and
maximum allowed values for the specific model.
Operation out of the mentioned limits may damage the unit.
In case of doubts contact manufacturer representative.

D-EIMAC00907-16EN - 6/20
Figure 1 - Description of the labels applied to the electrical panel
Single circuit unit
Double circuits unit
Label Identification
1–Manufacturer’s logo
5–Cable tightening warning
2–Gas type
6–Non flammable gas symbol
3–Hazardous Voltage warning
7–Unit nameplate data
4–Electrical hazard symbol
8–Lifting instruction

D–EIMAC00907–16EN - 7/20
Safety
The unit must be firmly secured to the soil.
It is essential to observe the following instructions:
The unit can only be lifted using the lifting points marked
in yellow fixed to its base.
It is forbidden to access the electrical components without
having opened the unit main switch and switched off the
power supply.
It is forbidden to access the electrical components without
using an insulating platform. Do not access the electrical
components if water and/or moisture are present.
Sharp edges and the surface of the condenser section
could cause injury. Avoid direct contact and use adeguate
protection device
Switch off power supply, by opening the main switch,
before servicing the cooling fans and/or compressors.
Failure to observe this rule could result in serious
personal injury.
Do not introduce solid objects into the water pipes while
the unit is connected to the system.
A mechanical filter must be installed on the water pipe
connected to the heat exchanger inlet.
The unit is supplied with safety valves, that are installed
both on the high-pressure and on the low-pressure sides
of the refrigerant circuit.
It is absolutely forbidden to remove all protections of
moving parts.
In case of sudden stop of the unit, follow the instructions on the
Control Panel Operating Manual which is part of the on-
board documentation delivered to the end user.
It is strongly recommended to perform installation and
maintenance with other people. 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 the Health Emergency Service
-wait without leaving the injured person alone until the
rescue operators come
-give all necessary information to the rescue operators
Avoid installing the chiller in areas that could be
dangerous during maintenance operations, such as
platforms without parapets or railings or areas not
complying with the clearance requirements around the
chiller.
Noise
The unit is a source of noise mainly due to rotation of
compressors and fans.
The noise level for each model size is listed in sales
documentation.
If the unit is correctly installed, operated and manteined the
noise emission level do not require any special protection
device to operate continuosly close to the unit without any risk.
In case of installation with special noise requirements it could
be necessary to install additional sound attenuation devices.
Moving and lifting
Avoid bumping and/or jolting during loading/unloading unit
from the truck and moving it. Do not push or pull the unit from
any part other than the base frame. Secure the unit inside the
truck to prevent it from moving and causing damages. Do not
allow any part of the unit to fall during transportation or
loading/unloading.
All units of the series are supplied with lifting points marked in
yellow. Only these points may be used for lifting the unit, as
shown in the following figure.
Use spacing bars to prevent damage to the condensation
bank. Position these above the fan grills at a distance of at
least 2.5 metres.
Both the lifting ropes and the spacing bars must be
strong enough to support the unit safely. Please check
the unit’s weight on the unit nameplate.
The unit must be lifted with the utmost attention and care
following lifting label instructions; lift unit very slowly, keeping it
perfectly level.
Positioning and assembly
All units are designed for installation outdoors, either on
balconies or on the ground, provided that the installation area
is free of obstacles that could reduce air flow to the
condensers coil.
The unit must be installed on a robust and perfectly level
foundation; should the unit be installed on balconies or roofs, it
might be necessary to use weight distribution beams.
Figure 2 - Lifting
Unit with 4 lifting points
(The drawing shows only the 6 fans version. For the 4 fans version the lifting mode is the same)

D-EIMAC00907-16EN - 8/20
Unit with 6 lifting points
(The drawing shows only the 12 fans version. The lifting mode is the same for the different number of fans)
Figure 3 –Unit Levelling
For installation on the ground, a strong concrete base, at least
250 mm thickness and wider than the unit must be provided.
This base must be able to support the weight of the unit.
The unit must be installed above antivibrating mounts (AVM),
rubber or spring types. The unit frame must be perfectly
levelled above the AVM.
Installation such as in the figure above must always be
avoided. In case the AVM’s are not adjustable (spring type are
normally not adjustable) the flatness of the unit frame must be
guaranteed by using metal plate spacers.
Before unit commissioning, the flatness must be verified by
using a laser levelling device or other similar devices. The
flatness shall not be over 5 mm for units within 7 m length and
10 mm for units over 7 m.
If the unit is installed in places that are easily accessible to
people and animals, it is advisable to install protection grids for
the condenser and compressor sections.
To ensure best performance on the installation site, the
following precautions and instructions must be followed:
Avoid air flow recirculation.
Make sure that there are no obstacles to hamper air flow.

D-EIMAC00907-16EN - 9/20
Make sure to provide a strong and solid foundation to
reduce noise and vibrations.
Avoid installation in particularly dusty environments, in
order to reduce soiling of condensers coils.
The water in the system must be particularly clean and all
traces of oil and rust must be removed. A mechanical
water filter must be installed on the unit’s inlet piping.
Minimum space requirements
It is fundamental to respect minimum distances on all units in
order to ensure optimum ventilation to the condenser coils.
When deciding where to position the unit and to ensure a
proper air flow, the following factors must be taken into
consideration:
avoid any warm air recirculation
avoid insufficient air supply to the air-cooled condenser.
Both these conditions can cause an increase of condensing
pressure, which leads to a reduction in energy efficiency and
refrigerating capacity.
Any side of the unit must be accessible for post-installation
maintenance operations. Figure 3 shows the minimum space
required.
Vertical air discharge must not be obstructed.
If the unit is surrounded by walls or obstacles of the same
height as the unit, this must be installed at a distance no lower
than 3000 mm.
In case of two chillers installed in free field, minimum
recommended distance between them is 3600 mm; in case of
two chillers in a row, minimum distance is 1500 mm. The
pictures below show example of recommended installations.
Should the unit be installed without observing the
recommended minimum distances from walls and/or vertical
obstacles, there could be a combination of warm air
recirculation and/or insufficient supply to the air-cooled
condenser which could cause a reduction of capacity and
efficiency.
In any case, the microprocessor will allow the unit to adapt
itself to new operating conditions and deliver the maximum
available capacity under any given circumstances, even if the
lateral distance is lower than recommended, unless the
operating conditions should affect personel safety or unit
reliability.
Figure 4 –Minimum clearance requirements

D-EIMAC00907-16EN - 10/20
The minimum distances, reported above, ensure functionality
of the chiller in most applications. However, there are specific
situations which include multiple chiller installations: in this
case the following recommendations are to be followed:
Multiple chiller installed side by side in a free field with
dominant wind.
Considering an installation in areas with a dominant wind from
a specific direction (as shown in the Fig.5):
Chiller N°1: is performing normally without any
ambient over-temperature
Chiller N° 2: is working in a warmed ambient. The
first circuit (from the left) is working with air
recirculating from Chiller 1 and the second circuit to
the recirculating air from the chiller N°1 and
recirculation from itself.
Chiller N° 3: circuit on the left is working in a over-
temperature ambient due to the recirculating air from
the other two chillers, circuit on the right is working
quite normally.
In order to avoid the hot air recirculation due to dominant
winds, the installation where all chillers are aligned to the
dominant wind is preferred (see figure below):
Multiple chiller installed side by side in a compound.
In case of compounds with walls of the same height of the
chillers or higher, the installation is not recommended. Chiller 2
and chiller 3 work with sensible higher temperature due to the
enhanced recirculation. In this case special precautions must
be taken in to account according to the specific installation (eg:
louvered walls, install the unit on base frame in order to
increase the height, ducts on the discharge of the fans, high lift
fans, etc).
All the above cases are even more sensitive in case of design
conditions close to the limits of the unit operating envelope.
NOTE: Daikin cannot be considered responsible in case of
malfunctions generated by hot air recirculation or insufficient
airflow as result of improper installation if the above
recommendations are ignored.
Figure 5 –Multiple Chiller Installation

D-EIMAC00907-16EN - 11/20
Sound protection
When sound levels require special control, great care must be
exercised to isolate the unit from its base by appropriately
applying anti-vibration elements (supplied as an option).
Flexible joints must be installed on the water connections, as
well.
Water piping
Piping must be designed with the lowest number of elbows
and the lowest number of vertical changes of direction. In this
way, installation costs are reduced considerably and system
performance is improved.
The water system must have:
1. Anti-vibration mountings in order to reduce transmission of
vibrations to the structures.
2. Isolating valves to isolate the unit from the water system
during maintenance.
3. Flow switch, in order to protect the chiller must be
protected against freezing by continuous monitoring of the
water flow in the evaporator. In most cases, on-site the
flow switch is set to produce an alarm only when the water
pump switches OFF and the water flow fall to zero. it is
recommended to adjust the flow switch in order to produce
a “Water Loss Alarm” when the water flow reaches 50% of
the nominal value, in this case the evaporator is protected
against the freezing and the flow switch can detect the
water filter clogging.
4. Manual or automatic air venting device at the system’s
highest point.; drain device at the system’s lowest point.
5. Neither the evaporator nor the heat recovery device must
be positioned at the system’s highest point.
6. A suitable device that can maintain the water system under
pressure (expansion tank, etc.).
7. Water temperature and pressure indicators to assist the
operator during service and maintenance.
8. A filter or device that can remove particles from the fluid.
The use of a filter extends the life of the evaporator and
pump and helps to keep the water system in a better
condition. The water filter must be installed as close as
possible to the chiller, as in Figs. 6 and 7. If the water
filter is installed in another part of the water system, the
Installer has to guarantee the cleaning of the water pipes
between the water filter and the evaporator.
9. Evaporator 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/devices outside the unit must
therefore be protected against freezing.
10. The heat recovery device must be emptied of water during
the winter season, unless an ethylene glycol mixture in
appropriate percentage is added to the water circuit.
11. If case of unit substitution, the entire water system must be
emptied and cleaned before the new unit is installed.
Regular tests and proper chemical treatment of water are
recommended before starting up the new unit.
12. In the event that glycol is added to the water system as
anti-freeze protection, pay attention to the fact that suction
pressure will be lower, the unit’s performance will be lower
and water pressure drops will be greater. All unit-protection
systems, such as anti-freeze, and low-pressure protection
will need to be readjusted.
13. Before insulating water piping, check that there are no
leaks.
Water treatment
Before putting the unit into operation, clean the water circuit.
Any damage due to the presence of foreign bodies or debris in
the evaporator will not be covered by warranty. Dirt, scales,
corrosion debrits and other material can accumulate inside the
heat exchanger and reduce its heat exchanging capacity.
Pressure drop can increase as well, thus reducing water flow.
Proper water treatment therefore reduces the risk of corrosion,
erosion, scaling, etc.. The most appropriate water treatment
must be determined locally, according to the type of system
and water characteristics.
The manufacturer is not responsible for damage to or
malfunctioning of equipment caused by failure to treat water or
by improperly treated water.
Table 1 - Acceptable water quality limits
pH (25°C)
6,88,0
Total Hardness (mg CaCO3/ l)
200
Electrical conductivity S/cm (25°C)
800
Iron (mg Fe / l)
1.0
Chloride ion (mg Cl - / l)
200
Sulphide ion (mg S2 - / l)
None
Sulphate ion (mg SO24- / l)
200
Ammonium ion (mg NH4+/ l)
1.0
Alkalinity (mg CaCO3 / l)
100
Silica (mg SiO2/ l)
50

D–EIMAC00907–16EN - 12/20
Evaporator and recovery exchangers anti-freeze
protection
All evaporators are supplied with a thermostatically controlled
anti-freeze electrical resistance, which provides adequate anti-
freeze protection at temperatures as low as –25°C.
However, unless the heat exchangers are completely empty
and cleaned with anti-freeze solution, additional methods
should also be used against freezing.
Two or more of below protection methods should be
considered when designing the system as a whole:
Continuous water flow circulation inside piping and
exchangers
Addition of an appropriate amount of glycol inside the
water circuit
Additional heat insulation and heating of exposed piping
Emptying and cleaning of the heat exchanger during the
winter season
It is the responsibility of the installer and/or of local
maintenance personnel to ensure that described anti-freeze
methods are used. Make sure that appropriate anti-freeze
protection is maintained at all times. Failing to follow the
instructions above could result in unit damage. Damage
caused by freezing is not covered by the warranty.
Installing the flow switch
To ensure sufficient water flow through the evaporator, it is
essential that a flow switch be installed on the water circuit.
The flow switch can be installed either on the inlet or outlet
water piping. The purpose of the flow switch is to stop the unit
in the event of interrupted water flow, thus protecting the
evaporator from freezing.
The manufacturer offers, as optional, a flow switch that has
been selected for this purpose.
This paddle-type flow switch is suitable for heavy-duty outdoor
applications (IP67) and pipe diameters in the range of 1” to 6”.
The flow switch is provided with a clean contact which must be
electrically connected to terminals shown in the wiring
diagram.
Flow switch has to be tune to intervene when the evaporator
water flow is lower than 50% of nominal flow rate.
Heat recovery
Units may be optionally equipped with heat recovery system.
This system in made by a water cooled heat exchanger
located on the compressors discharge pipe and a dedicated
management of condensing pressure.
To guarantee compressor operation within its envelope, units
with heat recovery cannot operate with water temperature of
the heat recovery water lower than 28°C.
It is a responsibility of plant designer and chiller installer to
guarantee the respect of this value (e.g. using recirculating
bypass valve)
Figure 6 - Water piping connection for evaporator
1. Pressure Gauge
2. Flexible connector
3. Flow switch
4. Temperature probe
5. Isolation Valve
6. Pump
7. Filter
Figure 7 - Water piping connection for heat recovery exchangers
1. Pressure Gauge
2. Flexible connector
3. Temperature probe
4. Isolation Valve
5. Pump
6. Filter

D-EIMAC00907-16EN - 13/20
Electrical Installation
General specifications
All electrical connections to the unit must be carried out
in compliance with laws and regulations in force.
All installation, management and maintenance activities
must be carried out by qualified personnel.
Refer to the specific wiring diagram for the unit you have
bougth. Should the wiring diagram not be on the unit or
should it have been lost, please contact your
manufacturer representative, who will send you a copy.
In case of discrepance between wiring diagram and
electrical panel/cables, please contact the manufacturer
representative.
Only use copper conductors. Failure to use copper conductors
could result in overheating or corrosion at connection points
and could damage the unit.
To avoid interference, all control wires must be connected
separately from the power cables. Use different electrical
passage ducts for this purpose.
Particular care must be taken when realizing wire connections
to the switchbox; if not properly sealed, cable entries may
allow ingress of water into the switchbox which may cause
damage to the equipment inside.
Before any installation and connection works, the unit
must be switched off and secured. Since this unit
includes inverters, the intermediate circuit of the
capacitors remains charged with high voltage for a short
period of time after being switched off. Do not operate to
the unit before 5 minutes after the unit has been
switched off.
This unit includes non-linear loads such as inverters, which
have a natural current leakage to earth. If an Earth Leakage
Detector is installed upstream the unit, a type B device with a
minimum threshold of 300 mA must be used.
This product complies with EMC standards for industrial
environments. Therefore it is not intended for use in residential
areas, e.g. installations where the product is connected to a
low voltage public distribution system. Should this product
need to be connected to a low voltage public distribution
system, specific additional measures will have to be taken to
avoid interference with other sensitive equipment.
Operation
Operator’s responsibilities
It is essential that the operator is appropriately trained and
becomes familiar with the system before operating the unit. In
addition to reading this manual, the operator must study the
microprocessor operating manual and the wiring diagram in
order to understand start-up sequence, operation, shutdown
sequence and operation of all the safety devices.
During the unit’s initial start-up phase, a technician authorized
by the manufacturer is available to answer any questions and
to give instructions as to the correct operating procedures.
The operator must keep a record of operating data for every
installed unit. Another record should also be kept of all the
periodical maintenance and servicing activities.
If the operator notes abnormal or unusual operating conditions,
he is advised to consult the technical service authorized by the
manufacturer.
Maintenance
Routine maintenance
This chiller must be maintained by qualified technicians.
Before beginning any work on the system the personnel
shall assure that all security precautions have been taken.
Neglecting unit maintenance in these environments, could
degrade all parts of the units (coils, compressors, frames,
pipes, etc..) with negative effect on performances and
functionality.
There are two different levels of maintenance, which can be
chosen according to the type of application (critical/non critical)
or to the installation environment (highly aggressive).
Examples of critical applications are process cooling, data
centres, etc.
Highly Aggressive Environments can be defined as the follows:
Industrial environment (with possible concentration
of fumes result of combustion and chemical process)
Costal environment;
Highly polluted urban environment;
Rural environment close to of animal excrement and
fertilizers, and high concentration of exhaust gas
from diesel generators.
Desert areas with risk of sandstorms;
Combinations of the above
Table 2 lists all Maintenance activities for standard applications
and standard environment.
Table 3 lists all Maintenance activities for critical applications
or highly aggressive environment.
Following below instructions is mandatory for cases listed
above, but also advised for units installed in standard
environments.
Table 2 –Standard Routine Maintenance Plan
List of Activities
Weekly
Monthly
(Note 1)
Yearly/Seas
Onal (Note 2)
General:
Reading of operating data (Note 3)
X
Visual inspection of unit for any damage and/or loosening
X
Verification of thermal insulation integrity
X
Clean and paint where necessary
X
Analysis of water (6)
X
Check of flow switch operation
X
Electrical:
Verification of control sequence
X
Verify contactor wear –Replace if necessary
X
Verify that all electrical terminals are tight –Tighten if necessary
X
Clean inside the electrical control board
X
Visual inspection of components for any signs of overheating
X
Verify operation of compressor and oil heater
X
Measure compressor motor insulation using the Megger
X
Clean air intake filters of the electrical panel
X

D-EIMAC00907-16EN - 14/20
Verify operation of all ventilation fans in the electrical panel
X
Verify operation of inverter cooling valve and heater
X
Verify status of capacitors in the inverter (signs of damage, leaks, etc)
X
List of Activities
Weekly
Monthly
(Note 1)
Yearly/Seas
Onal (Note 2)
Refrigeration circuit:
Check for any refrigerant leakage
X
Verify refrigerant flow using the liquid sight glass –Sight glass full
X
Verify filter dryer pressure drop
X
Verify oil filter pressure drop (Note 5)
X
Analyse compressor vibrations
X
Analyse compressor oil acidity (7)
X
Condenser section:
Clean water rinse condenser banks (Note 4)
X
Verify that fans are well tightened
X
Verify condenser bank fins –Comb if necessary
X
Notes:
1. Monthly activities include all the weekly ones.
2. The annual (or early season) activities include all weekly and monthly activities.
3. Unit operating values should be read on a daily basis thus keeping high observation standards.
4. In environments with a high concentration of air-borne particles, it might be necessary to clean the condenser bank more often.
5. Replace the oil filter when the pressure drop across it reaches 2.0 bar.
6. Check for any dissolved metals.
7. TAN (Total Acid Number) : 0,10 : No action
Between 0.10 and 0.19 : Replace anti-acid filters and re-check after 1000 running hours. Continue to replace filters until the TAN is lower
than 0.10.
0,19 : Replace oil, oil filter and filter dryer. Verify at regular intervals.
Table 3 –Routine Maintenance Plan for Critical Application and/or Highly Aggressive Environment
List of Activities (Note 8)
Weekly
Monthly
(Note 1)
Yearly/Seas
Onal (Note 2)
General:
Reading of operating data (Note 3)
X
Visual inspection of unit for any damage and/or loosening
X
Verification of thermal insulation integrity
X
Clean
X
Paint where necessary
X
Clean and paint where necessary
X
Analysis of water (6)
X
Check of flow switch operation
X
Electrical:
Verification of control sequence
X
Verify contactor wear –Replace if necessary
X
Verify that all electrical terminals are tight –Tighten if necessary
X
Clean inside the electrical control board
X
Visual inspection of components for any signs of overheating
X
Verify operation of compressor and oil heater
X
Measure compressor motor insulation using the Megger
X
Clean air intake filters of the electrical panel
X
Verify operation of all ventilation fans in the electrical panel
X
Verify operation of inverter cooling valve and heater
X
Verify status of capacitors in the inverter (signs of damage, leaks, etc)
X
Refrigeration circuit:
Check for any refrigerant leakage
X
Verify refrigerant flow using the liquid sight glass –Sight glass full
X
Verify filter dryer pressure drop
X
Verify oil filter pressure drop (Note 5)
X
Analyse compressor vibrations
X
Analyse compressor oil acidity (7)
X
Condenser section:
Clean water rinse condenser coils (Note 4)
X
Quarterly clean condenser coils (E-coated only)
X
Verify that fans are well tightened
X
Verify condenser coil fins –Comb if necessary
X
Notes: 8. Units placed or stored in a Highly Aggressive Environment for long time without operation are still subject to those routine maintenance steps.

D–EIMAC00907–16EN - 15/20
Unit Maintenance and Cleaning
Unit exposed to a highly aggressive environment can face
corrosion in a shorter time than ones installed on a standard
environment. Corrosion causes a rapid rusting of the frame
core, consequently decreases unit structure life time. To avoid
that, it is necessary to wash periodically the frame surfaces
with water and suitable detergents.
In case of part of unit frame paint came off, it is important to
stop its progressive deterioration by repainting the exposed
parts using proper products. Please contact factory to get the
required products specifications.
Note: in case of just salt deposits are present, it is enough to
rinse the parts with fresh water.
Microchannel Coil Maintenance
Routine cleaning of coil surfaces is essential to maintain
proper operation of the unit, avoid corrosion and rusting.
Elimination of contamination and removal of harmful residues
will greatly increase the life of the coil and extend the life of the
unit.
Relative to fin and tube heat exchangers, microchannel coils
tend to accumulate more of the dirt on the surface and of the
less dirt inside which can make them easier to clean.
The following maintenance and cleaning procedure are
recommended as part of the routine maintenance activities.
1. Remove surface dirt, leaves, fibers, etc. with a vacuum
cleaner (preferably with a brush or other soft attachment
rather than a metal tube), compressed air blown from the
inside out, and/or a soft bristle (not wire!) brush. Do not
impact or scrape the coil with the vacuum tube, air
nozzle, etc..
NOTE: Use of a water stream, such as a garden hose, against
a surface loaded coil will drive the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded
fibers must be completely removed prior to using low velocity
clean water rinse.
2. Rinse. Do not use any chemicals (including those
advertised as coil cleaners) to wash microchannel heat
exchangers. They can cause corrosion. Rinse only. Hose
the MCHE off gently, preferably from the inside out and
top to bottom, running the water through every fin
passage until it comes out clean. Microchannels fins are
stronger than traditional tube & fin coil fins but still need to
be handled with care.
It is possible to clean a coil with a high pressure washer
(max 62 barg) only if a flat shape of the water spray is
used and direction of the spay is kept perpendicular to the
fin edge. If this direction is not respected the coil may
be destroyed if using a pressure washer so we do not
recommend their use.
NOTE: A monthly clean water rinse is recommended for coils
that are applied in coastal or industrial environments to help to
remove chlorides, dirt and debris. It is very important when
rinsing, to water temperature is less than 550. An elevated
water temperature (not to exceed 550 C) will reduce surface
tension, increasing the ability to remove chlorides and dirt.
3. Quarterly cleaning is essential to extend the life of an E-
coated coil and is required to maintain warranty coverage.
Failure to clean an E-coated coil will void the warranty
and may result in reduced efficiency and durability in the
environment. For routine quarterly cleaning, first clean the
coil with an approved coil cleaner. After cleaning the coils
with the approved cleaning agent, use the approved
chloride remover to remove soluble salts and revitalize
the unit.
NOTE: Harsh chemicals, household bleach or acid cleaners
should not be used to clean E-coated coils. These cleaners
can be very difficult to rinse out of the coil and can accelerate
corrosion and attack the E-coating. If there is dirt below the
surface of the coil, use the recommended coil cleaners as
described above.
Inverter Electrolytic Capacitors
Compressor Inverters include electrolytic capacitors which
have been designed to last a minimum of 15 years in normal
use. Heavy duty conditions may reduce the actual life of
capacitors.
The chiller calculates capacitor residual life based on actual
operation. When residual life gets below a give threshold, a
warning is issued by the controller. In this case replacement of
capacitors is recommended. This operation must be done only
by qualified technicians. Replacement must be carried out
through the following procedure:
Power off the chiller
Wait for 5 minutes before opening the inverter case
Check that residual dc voltage in the dc link is zero.
Open the inverter case and replace old capacitors
with new ones.
Reset the chiller controller through the maintenance
menu. This will allow the controller to recalculate the
new estimated life of the capacitors.
Capacitor Reforming after long shut-off period
Electrolytic capacitors may lose part of their original
characteristics if they are not powered for more than 1 year. If
chiller has been shut off for a longer period a “reforming”
procedure as follows is necessary:
Power on the inverter
Keep it powered on without starting the compressor
for at least 30 minutes
After 30 minutes the compressor can be started
Low Ambient Start-up
Inverters include a temperature control which allows them to
withstand ambient temperatures down to -20°C. However they
should not be switched on at temperatures lower than 0°C
unless the following procedure is executed:
Open the switchbox (only trained technicians should
perform this operation)
Open compressor fuses (by pulling the fuse holders)
or compressor circuit breakers
Power on the chiller
Keep the chiller powered on for 1 hour at least (this
allows inverter heaters to warm-up the inverter).
Close fuse holders
Close the switchbox
Service and limited warranty
All units are factory-tested and guaranteed for 12 months as of
the first start-up or 18 months as of delivery.
These units have been developed and constructed according
to high quality standards ensuring years of failure-free
operation. It is important, however, to ensure proper and
periodical maintenance in accordance with all the procedures
listed in this manual and with good practice of machines
maintenance.
We strongly advise stipulating a maintenance contract with a
service authorized by the manufacturer in order to ensure
efficient and problem-free service, thanks to the expertise and
experience of our personnel.
It must also be taken into consideration that the unit requires
maintenance also during the warranty period.
It must be borne in mind that operating the unit in an
inappropriate manner, beyond its operating limits or not
performing proper maintenance according to this manual can
void the warranty.
Observe the following points in particular, in order to conform
to warranty limits:
1. The unit cannot function beyond the specified limits
2. The electrical power supply must be within the voltage
limits and without voltage harmonics or sudden changes.
3. The three-phase power supply must not have un
unbalance between phases exceeding 3%. The unit must
stay turned off until the electrical problem has been
solved.
4. No safety device, either mechanical, electrical or
electronic must be disabled or overridden.

D-EIMAC00907-16EN - 16/20
5. The water used for filling the water circuit must be clean
and suitably treated. A mechanical filter must be installed
at the point closest to the evaporator inlet.
6. Unless there is a specific agreement at the time of
ordering, the evaporator water flow rate must never be
above 120% and below 80% of the nominal flow rate.
Periodic obligatory checks and starting up of
appliances under pressure
The units are included in category I → III of the classification
established by the European Directive 2014/68/EU (PED).
For chillers belonging to this category, some local regulations
require a periodic inspection by an authorized agency. Please
check with your local requirements.
Important information regarding the refrigerant
used
This product contains fluorinated greenhouse gases. Do not
vent gases into the atmosphere.
Refrigerant type: R134a
GWP(1) value: 1300
(1)GWP = global warming potential
The refrigerant quantity necessary for standard operation is
indicated on the unit name plate.
Real refrigerant quantity charged in the unit is listed on a silver
sticker inside the electrical panel.
Periodical inspections for refrigerant leaks may be required
depending on European or local legislation.
Please contact your local dealer for more information.
Disposal
The unit is made of metal, plastic and electronic parts. All
these parts must be disposed of in accordance with the local
regulations in terms of disposal.
Lead batteries must be collected and sent to specific refuse
collection centres.
Oil must be collected and sent to specific refuse collection
centres.
This manual is a technical aid and does not represent a binding offer. 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.
The manufacturer 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.
We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding.

D-EIMAC00907-16EN - 17/20

D-EIMAC00907-16EN - 18/20

D-EIMAC00907-16EN - 19/20

D-EIMAC00907-16EN - 20/20
The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A..
Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge. No express or implied warranty is
given for the completeness, accuracy, reliability or fitness for particular purpose of its content, and the products and services presented
therein. Specification are subject to change without prior notice. Refer to the data communicated at the time of the order. Daikin Applied
Europe S.p.A. explicitly rejects any liability for any direct or indirect damage, in the broadest sense, arising from or related to the use
and/or interpretation of this publication. All content is copyrighted by Daikin Applied Europe S.p.A..
DAIKIN APPLIED EUROPE S.p.A.
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Tel: [phone] - Fax: [phone]
http://www.daikinapplied.eu