Daikin EWYT021CZI-A1 Manual

D-EIMHP01505-22_00EN 1/59
REV
00
Date
31/05/2022
Supersedes
-
Air to water heat pump units with scroll compressors –split
version
EWYT~CZ(I/O)
Original Instructions
Installation and Maintenance Manual
D-EIMHP01505-22_00EN

D-EIMHP01505-22_00EN 2/59
Contents
1. INTRODUCTION.............................................................................................................................................................5
1.1. Precautions against residual risks..........................................................................................................................5
1.2. General description.................................................................................................................................................6
1.3. Information about the refrigerant ............................................................................................................................7
1.4. Safety Devices General Description.......................................................................................................................7
1.5. Installation Site Requirements for the Indoor Unit..................................................................................................8
1.5.1. Installation room area requirements............................................................................................................8
1.5.2. Countermeasures......................................................................................................................................11
2. RECEIPT OF THE UNIT...............................................................................................................................................13
3. STORAGE.....................................................................................................................................................................13
4. MECHANICAL INSTALLATION...................................................................................................................................14
4.1. Safety....................................................................................................................................................................14
4.2. Handling and lifting...............................................................................................................................................14
4.2.1. Lifting the Outdoor MONO unit..................................................................................................................14
4.2.2. Lifting the Outdoor DUAL unit ...................................................................................................................15
4.2.3. Lifting the INDOOR unit.............................................................................................................................15
4.3. Outdoor Unit Positioning and assembly................................................................................................................16
4.3.1. Outdoor Unit Minimum space requirements..............................................................................................17
4.4. Indoor Unit Positioning and assembly ..................................................................................................................18
4.5. Additional installation site requirements ...............................................................................................................19
4.6. Combining Units and Options...............................................................................................................................20
4.7. Preparing Refrigerant Piping ................................................................................................................................20
4.8. Noise and sound protection..................................................................................................................................22
4.9. Water circuit for connection with the unit..............................................................................................................22
4.9.1. Water piping..............................................................................................................................................23
4.9.2. Flow switch................................................................................................................................................23
4.9.3. Repairing and checking the water circuit connection................................................................................23
4.9.4. Water pressure..........................................................................................................................................23
4.10.Water treatment....................................................................................................................................................23
4.11.Water pressure drops for filters ............................................................................................................................24
4.12.Indoor Unit Pump..................................................................................................................................................24
4.13.Operation limits.....................................................................................................................................................25
4.14.Operating stability and minimum water content in the system..............................................................................26
4.15.Water flow limits....................................................................................................................................................27
4.16.Calibrating the expansion vessel..........................................................................................................................27
5. ELECTRICAL INSTALLATION....................................................................................................................................29
5.1. General specifications ..........................................................................................................................................29
5.2. Electric connections..............................................................................................................................................29
5.3. Cable requirements ..............................................................................................................................................29
5.3.1. Maximum cable dimension........................................................................................................................30
5.3.2. Safety device requirements.......................................................................................................................30
5.4. Phase unbalance..................................................................................................................................................30
5.5. Master Wiring Diagram.........................................................................................................................................31
6. CONNECTING THE REFRIGERANT PIPING..............................................................................................................33
6.1. To braze the pipe end...........................................................................................................................................33
6.2. Using the ball valve...............................................................................................................................................34
6.3. To connect the refrigerant piping to the outdoor unit............................................................................................35

D-EIMHP01505-22_00EN 3/59
6.4. To connect the refrigerant piping to the indoor unit..............................................................................................36
6.5. Checking the refrigerant piping.............................................................................................................................37
6.5.1. Pressure Leak Test...................................................................................................................................37
6.5.2. To perform vacuum drying ........................................................................................................................37
6.5.3. To insulate the refrigerant piping...............................................................................................................38
6.6. Charging Refrigerant ............................................................................................................................................38
6.6.1. Precautions when charging refrigerant......................................................................................................39
6.6.2. To determine the additional refrigerant amount ........................................................................................39
6.6.3. Pre-charging refrigerant ............................................................................................................................40
6.6.4. Checks after charging refrigerant..............................................................................................................41
7. OPERATOR’S REPONSIBILITIES...............................................................................................................................42
8. MAINTENANCE............................................................................................................................................................43
8.1. Pressure / temperature table................................................................................................................................44
8.2. Routine maintenance............................................................................................................................................44
8.2.1. Air Heat Exchanger Maintenance..............................................................................................................46
8.2.2. Electrical Installation..................................................................................................................................47
8.2.3. Service and limited warranty.....................................................................................................................47
9. REFRIGERANT CIRCUIT SCHEME............................................................................................................................48
10.LIST OF THE LABELS APPLIED TO THE UNITS ......................................................................................................53
11.COMMISSIONING ........................................................................................................................................................56
12.IMPORTANT INFORMATION ON THE REFRIGERANT USED..................................................................................57
13.PERIODIC CHECKS AND COMMISSIONING OF PRESSURE EQUIPMENT............................................................57
14.DISMISSION AND DISPOSAL.....................................................................................................................................57
List of figures
Figure 1 –Lifting the outdoor MONO unit...........................................................................................................................14
Figure 2 –Lifting the outdoor DUAL unit.............................................................................................................................15
Figure 3 –Indoor Unit Handling & LIFTING........................................................................................................................15
Figure 4 –MONO unit positioning.......................................................................................................................................16
Figure 5 –DUAL unit positioning........................................................................................................................................16
Figure 6 –Mounting holes location (bottom view) ..............................................................................................................16
Figure 7 –DUAL unit ..........................................................................................................................................................17
Figure 8 –Units installed side by side along their shorter sides, B or D.............................................................................18
Figure 9 –Units installed side by side along their longer sides (Case 1 and Case 2)........................................................18
Figure 10 –Indoor Unit minimum space requirements.......................................................................................................19
Figure 11 –Seaside installation of the outdoor unit............................................................................................................20
Figure 12 –Piping scheme Indoor unit - Outdoor unit........................................................................................................21
Figure 13 –Hydraulic diagram............................................................................................................................................22
Figure 14 –Hydraulic elements..........................................................................................................................................22
Figure 15 –Water filter pressure drops ..............................................................................................................................24
Figure 16 –External pressure head of water pump............................................................................................................25
Figure 17 –Operating limits on EWYT_CZ in cooling mode ..............................................................................................25
Figure 18 –Operating limits on EWYTCZ in heating mode................................................................................................26
Figure 19 –Minimum water volume correction factor.........................................................................................................27
Figure 20 –Initial expansion vessel pressure based on maximum water volume..............................................................28
Figure 21 –Master Wiring diagram.....................................................................................................................................31
Figure 22 –Pipe Brazing ....................................................................................................................................................34
Figure 23 –Ball-Valve.........................................................................................................................................................34
Figure 24 –Refrigerant circuit (P&ID) diagram for MONO circuit EWYT~CZ unit..............................................................48
Figure 25 –Water Circuit P&ID for EWYT-CZ Units...........................................................................................................50
Figure 26 –Refrigerant circuit (P&ID) diagram for DUAL circuit EWYT~CZ outdoor unit..................................................51
Figure 27 –Refrigerant circuit (P&ID) diagram for DUAL circuit EWYT~CZ indoor unit ....................................................52
Figure 28 –Labels on the outdoor unit...............................................................................................................................54
Figure 29 –Labels on the indoor unit .................................................................................................................................54
Figure 30 –Labels on the indoor unit –Electric panel side................................................................................................55

D-EIMHP01505-22_00EN 4/59
List of tables
Table 1 –Physical properties of R32 refrigerant...................................................................................................................7
Table 2 –Space requirements: NOT Lowest Underground Floor.........................................................................................9
Table 3 –Space requirements: Lowest Underground Floor...............................................................................................10
Table 4 –Temper Grade for piping material.......................................................................................................................21
Table 5 –Pipe thickness for R32........................................................................................................................................21
Table 6 –Piping diameters table ........................................................................................................................................21
Table 7 –Piping length and height difference table............................................................................................................22
Table 8 –Water piping diameters.......................................................................................................................................23
Table 9 –Flow Switch Setpoint...........................................................................................................................................23
Table 10 –Acceptable water quality limits..........................................................................................................................24
Table 11 –Pump curves associated with each unit size ....................................................................................................25
Table 12 –Minimum water content in the system...............................................................................................................26
Table 13 –Operating limits.................................................................................................................................................27
Table 14 –Table 1 of EN602041 Point 5.2.........................................................................................................................30
Table 15 –Reference No. 1................................................................................................................................................32
Table 16 –Reference No. 2................................................................................................................................................32
Table 17 –Reference No. 3................................................................................................................................................32
Table 18 –R32 Pressure/Temperature ..............................................................................................................................44
Table 19 –Yearly maintenance checklist for the indoor unit ..............................................................................................44
Table 20 –Standard Routine Maintenance Plan................................................................................................................45
Table 21 –Routine Maintenance Plan for Critical Application and/or Highly Aggressive Environment..............................46
Table 22 –Labels applied to the Unit .................................................................................................................................53
Table 23 –Checks before starting up the unit....................................................................................................................56

D-EIMHP01505-22_00EN 5/59
1. INTRODUCTION
This appliance is intended to be used by expert or trainedusers in shops, in light industry and on farms, or for commercial
use by lay persons. The appliance shall not be accessible to the general public: it must be installed in a safety area,
protected from easy access.
This manual provides information on the standard functions and proceduresof all units in the series, and it is an important
supporting document for qualified personnel but can never replace it.
All units are delivered with wiring diagrams, certified drawings, nameplate, and Declaration of Conformity. These
documents show all technical data for the unit you have bought. In case of any discrepancies between the contents of the
manual and the documentation provided with the unit, always rely on the unit because it is an integral part of this manual.
Read this manual carefully before installing and starting up the unit.
Improper installation could result in electric shock, short circuits, leaks, fire, or other damage to the equipment or injure to
people.
The unit must be installed by professional operators / technicians in compliance with the laws in force in the country of
installation.
The start-up of the unit must also be performed by authorized and trained personnel and all activities must be carried out
in full compliance with local laws and regulations.
INSTALLATION AND START UP ARE ABSOLUTELY FORBIDDEN IF ALL INSTRUCTIONS
CONTAINED IN THIS MANUAL ARE NOT CLEAR.
If you are unsure about assistance and for more information, contact an authorized representative of the manufacturer.
1.1. Precautions against residual risks
1. Install the unit according to the instructions set out in this manual.
2. Regularly carry out all the maintenance operations foreseen in this manual.
3. Wear protective equipment (gloves, goggles, helmet, etc.) suited to the work in hand; do not wear clothes or
accessories that can get caught or sucked in by flows of air; tie back long hair before entering the unit.
4. Before opening the machine panel, 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 stabilize 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; 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 VFD, wait 10 minutes after removing the electric power supply before accessing the inside of the
switch board.
18. The unit contains pressurised refrigerant gas: the pressurised equipment must not be touched except during
maintenance, which must be entrusted to qualified and authorized personnel.
19. Connect the utilities to the unit following the indications set out in this manual and on the panels of the unit itself.
20. To avoid an environmental risk, make sure that any leaking fluid is collected in suitable devices in accordance with
local regulations.
21. If a part needs to be dismantled, make sure it is correctly reassembled before starting the unit.
22. When the rules in force require the installation of firefightingsystems near the machine, check thatthese 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.
23. Keep all the safety devices in good working order and check themperiodically according to the regulations in force.
24. Keep all lubricants in suitably marked containers.
25. Do not store inflammable liquids near the unit.
26. Solder or braze only empty pipes after removing all traces of lubricant oil; do not use flames or other heat sources
close to pipes containing refrigerant fluid.
27. Do not use naked flames near the unit.
28. The machinery must be installed in structures protected against atmospheric discharge accordingto the applicable
laws and technical standards.
29. Do not bend or hit pipes containing pressurised fluids.
30. It is not permitted to walk or rest other objects on the machines.
31. The user is responsible for overall evaluation of the risk of fire in the place of installation (for example, calculation
of the fire load).

D-EIMHP01505-22_00EN 6/59
32. During transport, always secure the unit to the bed of the vehicle to prevent it from moving about and overturning.
33. The machine must be transported according to the regulations in force considering the characteristics of the fluids
in the machine and the description of these on the safety data sheet.
34. 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.
35. 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 / ISO 5149-3 and the
local regulations in force.
36. The installation must comply with the requirements of EN 378-3 / ISO 5149-3 and the local regulations in force.
1.2. General description
The unit purchased is a Heat Pump, that is a machine designed to cool/heat the water within certain limits which will be
listed below. The unit operates based on the compression, condensation, and evaporation of the coolant gas as per the
Carnot cycle and is composed mainly of the following parts depending on the Mode of Operation.
The unit is in “split”configuration, which means it is made up of two main parts:
▪The Indoor Unit, which will be installed in an enclosed space and contains the water circuit and the plate heat
exchanger
▪The Outdoor Unit, which will be installed in the open air and contains the compressor, the coil and the fans.
The two units will be connected through the refrigerant piping system built in the structure.
To ensure the correct operation of the heat pump, the outdoor and indoor units shall be electrically connected (refer to the
wiring diagram supplied with the units).
Cooling or Conditioning Mode:
▪One or more scroll compressors which increase the pressure of the refrigerant gas from evaporation pressure to
condensation pressure.
▪A condenser where the refrigerant gas condenses under high pressure and transfers heat to the air.
▪An expansion valve which allows the pressure of condensed liquid refrigerant to be reduced from condensation
pressure to evaporation pressure.
▪An evaporator, where the low-pressure liquid refrigerant evaporates and chills the water.
Heating Mode or Heat Pump:
▪One or more scroll compressors which increase the pressure of the refrigerant gas from evaporation pressure to
condensation pressure.
▪A condenser where the refrigerant gas condenses under high pressure and transfers heat to the water.
▪An expansion valve which allows the pressure of condensed liquid refrigerant to be reduced from condensation
pressure to evaporation pressure.
▪An evaporator, where the low-pressure liquid refrigerant evaporates.
▪The operation of the heat exchangers can be inverted using the 4way valve, with which the use of the
heating/cooling unit can be seasonally inverted.
All units are fully assembled in the factory and tested before shipping. The EWYT~CZ(I/O) range consists of models with
a single cooling circuit and models with two cooling circuits.
The machine uses R32 refrigerant fluid suitable for the entire field of application of the machine.
The controller is prewired, set up and tested at the factory. Only normal field connections such as piping, electrical
connections and pump interlocks are required, simplifying installation, and increasing reliability. All safety and operation
control systems are installed at the factory in the control panel.
The instructions in this manual are applicable to all models in this series unless otherwise specified.

D-EIMHP01505-22_00EN 7/59
1.3. Information about the refrigerant
This product contains R32 refrigerant that has a minimal environmental impact, thanks to its low value of Global Warming
Potential (GWP). According to ISO 817, R32 refrigerant is classified as A2L, which is slightly flammable, since the flame
propagation rate is low, and nontoxic.
R32 refrigerant can burn slowly when all the following conditions are present:
▪The concentration is between the lower and upper flammability limit (LFL & UFL)
▪Wind velocity < propagation of flame velocity
▪Energy of the ignition source > Minimum ignition energy
But pose no risk under the normal usage conditions for air conditioning equipment and work environment.
Safety class (ISO 817)
A2L
PED Group
1
Practical limit (kg/m3)
0.061
ATEL/ ODL (kg/m3)
0.30
LFL (kg/m3) @ 60 °C
0.307
Vapor density @25 °C, 101.3 kPa (kg/m3)
2.13
Molecular mass
52.0
Boiling point (°C)
-52
GWP (100 yr ITH)
675
GWP (ARS 100 yr ITH)
677
Autoignition temperature (°C)
648
Maximum surface temperature (°C)
548
Table 1 –Physical properties of R32 refrigerant
1.4. Safety Devices General Description
The indoor unit is provided with a leak detection system and an integrated emergency fan.
The leak detector is embedded within the indoor unit and directly connected to the Unit’s control device. In case of gas
leakage, the detector willautomatically trigger the shut-down of the unit to prevent accidents. Furthermore, the emergency
fan will also be triggered and turned on in order to disperse the refrigerant.
This unit is equipped with electrically powered safety measures. For the safety measures to be
effective, the unit must be electrically powered at all times after installation, other than when
servicing.
Circulation airflow activated by a leak detection system
When the leak detection system is activated, the following actions take place and continue for at least 5 min after the
leak detection system has been reset:
•energize the fan of the appliance to deliver indoor airflow at or above the minimum airflow Qmin (240 m3/h);
•disable the compressor operation unless the compressor operation reduces the leak rate, or the total amount
released to the indoor space.
Threshold level
Alarm
Shut down
5000ppm
▪Eventual machinery rooms or special machinery rooms shall be clearly marked as such on the entrances to the
room, together with warning noticesindicating that unauthorized persons shall notenter 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.

D-EIMHP01505-22_00EN 8/59
1.5. Installation Site Requirements for the Indoor Unit
Also read the following requirements:
▪General installation site requirements. See the “General safety precautions”chapter.
▪Service space requirements.
▪Refrigerant piping requirements (length, height difference).
Local building codes and safety standards shall be followed; in absence of local codes and standards
refer to EN 378 3 / ISO 5149-3 as a guide.
•Provide sufficient space around the unit for servicing and air circulation.
•Make sure the installation site withstands the unit’s weight and vibration.
•Make sure the unit is levelled.
•Select the location of the unit in such a way that the sound generated by the unit does not disturb anyone, and
the location is selected according to the applicable legislation.
•Take care that in the event of a water leak, water cannot cause any damage to the installation space and
surroundings.
•During installation, avoid the possibility that anybody can climb on the unit or place objects on the unit.
•All piping lengths and distances have been taken into consideration (see “4.1 About the piping length”).
Do NOT install the unit in the following places:
- In potentially explosive atmospheres.
- In places where there is machinery that emits electromagnetic waves. Electromagnetic waves may disturb
the control system, and cause malfunction of the equipment.
- In places where there is a risk of fire due to the leakage of flammable gases (example: thinner or gasoline),
carbon fibre, ignitable dust.
- In places where corrosive gas (example: sulphurous acid gas) is produced. Corrosion of copper pipes or
soldered parts may cause refrigerant leaks.
- In places where a mineral oil mist, spray or vapour may be present in the atmosphere. Plastic parts may
deteriorate and fall off or cause water leakage.
Appliance NOT accessible to the public, install it in a secured area, protected from easy access. This
unit is suitable for installation in a commercial and light industrial environment
1.5.1. Installation room area requirements
The indoor unit must meet the Toxicity (EN 378) and Flammability (IEC 60335-2-40) requirements for
the installation
The EWYT~CZ(I/O) Units are labeled as “Enhanced Tightness Refrigerating Systems”. This, in accordance with the IEC
60335-2-40 Annex GG.2 Section.
In order to be considered an “Enhanced Tightness Refrigerant System”, the unit shall fulfill all of the following conditions:
a) No compressor or pressure vessel (BPHE > 15 l) type refrigerant containing components shall be located
indoors.
b) Refrigerant distribution assemblies shall meet all applicable requirements of this standard.
c) Refrigeration systems shall use only permanent joints indoors except for site-made joints directly connecting the
indoor unit to the refrigerant piping.
d) Refrigerant containing parts in indoor units shall be protected from damage in the event of catastrophic failure of
moving parts, e.g., fans.
e) Systems where the equipment pipes in the occupied space in question are installed in such a way that it is
protected against accidental damage.
f) The refrigeration system of each indoor unit shall be tightness tested at the factory with detection equipment
with a capability of 3 grams per year of refrigerant or better under a pressure of at least 0,25 times the
maximum allowable pressure. No leak shall be detected.
g) Vibrations exceeding 0,30 G rms, when measured with a low pass filter at 200 Hz, are not allowed in the
refrigerant containing parts in the occupied space under normal operation.
h) Indoor heat exchangers shall be protected from freezing.
i) The maximum fan operating speed shall be less than 90% of the maximum allowable fan speed as specified by
the manufacturer of the fan wheel.
All the conditions above mentioned have been tested and verified.

D-EIMHP01505-22_00EN 9/59
The indoor unit is provided with a leak detection system and an integrated emergency fan.
1.5.1.1. Toxicity Requirement (EN 378)
With respect to the toxicity value, the maximum refrigerant quantity is evaluated through the following formula

Where:
•T = Toxicity Requirement Formula
•MT= Reffrigerat Max Quantity [kg]
•0,3 = R32 Toxicity Limit
•H = Room Height [m]
•A = Room Area [m2]
If the actual charge of the unit Mr >MT the unit shallbe installed in a Machinery Room according to EN 378-3.
1.5.1.2. Flammability Requirement (IEC 60335-2-40) –Not Lowest Underground Floor
If the indoor unit is installed in the lowest underground floor, the maximum refrigerant quantity with respect to the
flammability value shall be evaluated through the following formula:

Where:
•B = Flammability Requirements for not lowest underground floor installation
•MB = Refrigerant Max Quantity [kg] for nor lowest underground installation
•CF = Concentration factor (for Not Lowest Underground Floor, CF = 0,75)
•LFL = Lower Flammability Limit (for R32, LFL = 0,307) [kg/m3]
•H = Room Height (but not more than 2,2 [m])
•A = Room Area [m2]
If the actual charge of the unit Mr >MB a safety alarm (Sound+Light) and ventilation (Natural or Forced) shall be
employed in accordance with EN 60335-2-40.
Table 2 –Space requirements: NOT Lowest Underground Floor

D-EIMHP01505-22_00EN 10/59
1.5.1.3. Flammability Requirement (IEC 60335-2-40) –Lowest Underground Floor
On the other hand, if the indoor unit is installed on the lowest underground floor, the maximum refrigerant quantity with
respect to the flammability value shall be evaluated through the following formula:

Where:
•A = Flammability Requirements for lowest underground floor installation
•MA= Refrigerant Max Quntity [kg] for lowest underground floor installation
•CF = Concentratiom factor (for Not Lowest Undergroud Floor, CF = 0,5)
•LFL = Lower Flammability Limit (for R32, LFL = 0,307) [kg/m3]
•H = Room Height (but not more than 2,2 [m])
•A = Room Area [m2]
If the actual charge of the unit Mr >MB a safety alarm (Sound+Light) and ventilation (Natural or Forced) shall be
employed in accordance with EN 60335-2-40.
Table 3 –Space requirements: Lowest Underground Floor
The formulas provided above are with reference to a fixed room height of 2,2m
Usage Example:
Room Height H = 3m; A = 20m2
•B: MB= 0,75 x 0,307 x 2,2 x A = 10,2 kg
•A: MA= 0,5 x 0,307 x 2,2 x A = 6,8 kg
•T: MT= 0,3 x 3 x S = 0,9 x A = 18 kg

D-EIMHP01505-22_00EN 11/59
Then, in these conditions, if:
Not Lowest Underground Floor:
•Mr> 18 kg →Machinery Room (EN378 –3) Required
•10,2 kg < Mr< 18 kg →Ventilation (Natural or Forced) + Alarms (sound & light) Required
•Mr< 10,2 kg →No countermeasures required
Lowest Underground Floor:
•Mr > 10,2 kg →Machinery Room (EN378 –3) Required
•6,8 kg < Mr< 10,2 kg →Ventilation (Natural or Forced) + Alarms (sound & light) Required
•Mr< 6,8 kg →At least 1 countermeasure required
1.5.2. Countermeasures
The safety countermeasures cited above refer to the IEC 60335-2-40 Annex GG.11 section.
1.5.2.1. Natural Ventilation
Opening Conditions for Natural Ventilation:
•The area of any openings above 300 mm from the floor shall not be considered in determining the compliance
with .
•At least 50% of the required opening area  shall be below 200 mm from the floor.
•The bottom of the lowest openings shall not be higher than the point of release when the unit is installed at not
more than 100 mm from the floor.
•Openings are permanent and cannot be closed.
•The height of the opening between the wall and floor which the rooms are not less than 20 mm.
•A second higher opening shall be provided. The total size of the second opening shall not be less than 50% of
the minimum opening area for  and shall be at least 1,5 m above the floor.
•Natural ventilation below ground level cannot be used.
 
  󰇛󰇜
For the refrigerant R32, LFL = 0,307. Thus:
ANV = 120 cm2(R32 Refrigerant)
The requirement for the second opening can be met by drop ceilings, ventilation ducts, or similar
arrangements that provide an airflow path between the connected rooms.
1.5.2.2. Mechanical Ventilation
Operation shall be according to GG.8.31 of the IEC 60335-2-40 Annex GG.11 section and for all indoor units in the same
space which are served by a single refrigerant system, the fan shall be switched on to provide the minimum circulation
airflow per GG.10.2 of the IEC 60335-2-40 Annex GG.11 section.
The airflow shall be determined according to the following formula:
 

 


D-EIMHP01505-22_00EN 12/59
1.5.2.3. Safety Alarms
The safety alarm system shall warn both audibly and visibly, such as both a loud buzzer (15 dBA above the background
level) and a flashing light.
At least one safety alarm inside the occupied space shall be installed.
For the occupancy listed below, the safety alarm system shall also warn at a supervised location, such as the night
porter’s location, as well as the occupied space:
•Rooms, parts of buildings, building where sleeping facilities are provided.
•Rooms, parts of buildings, building where people are restricted in their movement.
•Rooms, parts of buildings, building where an uncontrolled number of people are present.
•Rooms, parts of buildings, building to which any person has access without being personally acquainted with
the necessary safety precautions.
The safety alarm shall be turned on by the signal from the leak detection system. The safety alarm shall also alert an
authorized person to take appropriate action.

D-EIMHP01505-22_00EN 13/59
2. RECEIPT OF THE UNIT
Inspect the unit immediately after delivery. Make sure that the machine is intact in all its parts and that there are no
deformations due to impacts. All components described in the delivery note must be inspected and checked.
Should any damage occur upon receipt of the machine, do not remove the damaged material, and immediately make a
written complaint to the transport company, requesting the inspection of the unit; do not repair until an inspection by the
transport company representative is carried out.
Immediately report the damage to the manufacturer representative, a set of photographs would be helpful in recognizing
responsibility. The restitution of the machinery is intended as ex-factory Daikin Applied Europe S.p.A.
Daikin Applied Europe S.p.A. declines all responsibility for any damage that the machinery may suffer during transport to
the destination.
Use extreme caution when handling the unit to prevent damage to components. Before installing the unit, check that the
model and power supply voltage shown on the nameplate are correct. Responsibility for any damage after acceptance of
the unit cannot be attributed to the manufacturer.
The scheme below illustrates the nomenclature of the units.
3. STORAGE
If it is necessary to store the unit before installation, it is necessary to observe some precautions:
▪do not remove the protective plastic.
▪protect the unit from dust, bad weather and any rodents.
▪do not expose the unit to direct sunlight.
▪do not use heat sources and / or open flames near the machine.
Although the unit is covered with a heat shrink plastic sheet, it is not intended for long-term storage and must be removed
and replaced by tarpaulins or the like, more suitable for a longer period.
Environmental conditions must be within the following limits:
▪Minimum ambient temperature: -20 °C
▪Maximum ambient temperature: +48 °C
▪Maximum R.H.: 95% not condensing
Storage at a temperature below the minimum or over the maximum values can cause damage to the components. Storage
in a humid atmosphere may damage electrical components.

D-EIMHP01505-22_00EN 14/59
4. MECHANICAL INSTALLATION
4.1. Safety
Before installation and commissioning of the machinery, the people involved in this activity must have acquired the
information necessary to perform these tasks, applying all the information gathered in this manual. In particular:
▪the unit must be firmly anchored to the ground when it must not be moved.
▪the unit can only be lifted using the lifting points indicated by labels fixed to its base.
▪always protect operating personnel with personal protective equipment appropriate to the activities to be
performed. The individual devices commonly used are helmet, glasses, gloves, headphones, safety shoes.
Further personal and collective protection devices must be adopted after having carried out an adequate analysis
of the specific risks in the relevant area, according to the activities to be carried out.
4.2. Handling and lifting
Avoid bumping and/or jolting during loading/unloading unit from the truck and moving it. Do not push or pull the unit from
any part other than the base frame. Secure the unit inside the truck to prevent it from moving and causing damages. Do
not allow any part of the unit to fall during transportation or loading/unloading.
Equipment, ropes, lifting accessories and handling procedures must comply with local regulations and current legislation.
The ropes and hooks used must have an appropriate capacity for the load. Refer to the plate on the unit for the weight of
the specific machine.
All units of the series are supplied with lifting points indicated by labels: only these points may be used for lifting the unit.
The installer has the responsibility to ensure the selection and correct use of the lifting equipment.
Alternatively, the machine may be moved with a forklift, as shown in the following paragraphs. When lifting the machine,
make sure it is levelled properly so it will not overturn.
4.2.1. Lifting the Outdoor MONO unit
The outdoor part of the machine must be lifted slowly and well levelled. Always use protective devices to prevent damage
to the belt and note the position of the unit’s centre of gravity. Adjust the lifting equipment if necessary to ensure that the
unit is levelled.
The unit(s)- both Mono and Dual- can be lifted, using the buttonholes in the base, by:
-lifting straps
-forklift, where the dimensions of the forks permit.
The ropes and hooks used must have an appropriate capacity for the load.
N.B.: Follow the lifting instructions provided in the unit lifting label.
Figure 1 –Lifting the outdoor MONO unit

D-EIMHP01505-22_00EN 15/59
4.2.2. Lifting the Outdoor DUAL unit
Figure 2 –Lifting the outdoor DUAL unit
4.2.3. Lifting the INDOOR unit
A forklift can only be used for transport as long as the unit remains on its pallet as shown above.
Figure 3 –Indoor Unit Handling & LIFTING

D-EIMHP01505-22_00EN 16/59
4.3. Outdoor Unit Positioning and assembly
All the outdoor units are designed for installation outdoors, either on balconies or on the ground, provided that the
installation area is free of obstacles that could reduce air flow to the condensers coil.
The unit must be installed on a robust and perfectly level foundation; should the unit be installed on balconies or roofs, it
might be necessary to use weight distribution beams.
For installation on the ground, a strong concrete base, at least 150 mm thickness and wider than the unit must be provided.
This base must be able to support the weight of the unit. In heavy snowfall areas, this thickness should be increased.
The frame of the unit must be levelled using metal plate spaces.
Figure 4 –MONO unit positioning
Figure 5 –DUAL unit positioning
The base can be installed either longitudinally or transversely. In the following figures are illustrated the mounting holes
location:
Figure 6 –Mounting holes location (bottom view)
Unit mounting holes ø
12mm

D-EIMHP01505-22_00EN 17/59
To fasten the unit to the floor, use M10 bolts.
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.
To ensure best performance on the installation site, the following precautions and instructions must be followed:
▪Avoid air flow recirculation;
▪Make sure that there are no obstacles to hamper air flow;
▪Make sure to provide a strong and solid foundation to reduce noise and vibrations;
▪Avoid installation in particularly dusty environments, in order to reduce soiling of condensers coils.
4.3.1. Outdoor Unit Minimum space requirements
It is fundamental to respect minimum distances on all units to ensure optimum ventilation to the condenser coils.
When deciding where to position the unit and to ensure a proper air flow, the following factors must be taken into
consideration:
▪avoid any warm air recirculation.
▪avoid insufficient air supply to the air-cooled condenser.
Both these conditions can cause an increase of condensing pressure, which leads to a reduction in energy efficiency and
refrigerating capacity.
Any side of the unit must be accessible for post installation maintenance operations and vertical air discharge must not be
obstructed. The Figure below shows the minimum space required.
Figure 7 –DUAL unit
Where:
A
: Electrical panel side
B/D
: Side view of battery
C
: Front view of battery
If the unit is installed in a free field, the distances indicated are:
A/B/C/D 500 mm
In the presence of obstacles or walls, the following minimum distances are recommended:




With and the new minimum distances.

D-EIMHP01505-22_00EN 18/59
NOTE: In case the calculated value of and/or is higher than 2000 mm, consider 2000 mm as minimum distance.
If two units are installed in a free field side by side along their longer sides, Aand C, the minimum recommended distance
between them is 1000 mm; if two units are installed side by side along their shorter sides, sides B and D, the minimum
distance between them should be 500 mm. Should the unit be installed without observing the recommended minimum
distances from walls and/or vertical obstacles, there could be a combination of warm air recirculation and/or insufficient
supply to the air-cooled condenser which could cause a reduction of capacity and efficiency.
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 the recommended, unless the
operating conditions should affect personnel safety or unit reliability.
Figure 8 –Units installed side by side along their shorter sides, B or D
Case 1
Case 2
Figure 9 –Units installed side by side along their longer sides (Case 1 and Case 2)
The minimum distances, reported above, ensure functionality of the unit in most applications.
4.4. Indoor Unit Positioning and assembly
The outdoor and indoor unit shall be installed before connecting the refrigerant and water piping.
Also read the precautions and requirements in the following chapters:
General safety precautions
Preparation
Make sure the unit is installed on a sufficiently strong base to prevent vibration and noise.
The preferred installation is on a solid longitudinal foundation (steel beam frame or concrete).

D-EIMHP01505-22_00EN 19/59
▪When the installation height of the unit needs to be increased, do NOT use stands to only
support the corners.
▪Stands under the unit must be at least 100 mm wide.
There are two sides which can be mounted facing the wall. It is important to respect the minimum distances in any case.
The unit must be fixed to prevent it from tilting.
Observe the minimum installation space requirements.
Figure 10 –Indoor Unit minimum space requirements
The indoor unit and the equipment pipes shall be installed in such a way that it shall be protected against accidental
damage in the occupied space.
Fasten the unit in place using four foundation M8 bolts.
4.5. Additional installation site requirements
▪When installing, take strong winds, typhoons or earthquakes into account, improper installation may result in the
unit turning over.
▪Take care that in the event of a water leak, water cannot cause any damage to the installation space and
surroundings.
Unit mounting holes
ø10 mm

D-EIMHP01505-22_00EN 20/59
▪Be sure that the air inlet of the unit is not positioned towards the main wind direction. Frontal wind will disturb
the operation of the unit. If necessary, use a screen to block the wind.
▪Ensure that water cannot cause any damage to the location by adding water drains to the foundation and
prevent water traps in the construction.
Seaside installation. Make sure the outdoor unit is NOT directly exposed to sea winds. This is to prevent corrosion caused
by high levels of salt in the air, which might shorten the life of the unit.
Example: Behind the building (case I).
If the outdoor unit is exposed to direct sea winds, install a Windbreaker (case II).
•Height of windbreaker ≥1.5×height of outdoor unit
•Mind the service space requirements when installing the windbreaker.
Figure 11 –Seaside installation of the outdoor unit
Legend:
a. Sea wind
b. Building
c. Outdoor unit
d. Windbreaker
When operating the unit in a low outdoor ambient temperature, be sure to follow the instructions
described below.
To prevent exposure to wind and snow, install a baffle plate on the air side of the outdoor unit: in heavy snowfall areas it
is very important to select an installation site where the snow will NOT affect the unit. If lateral snowfall is possible, make
sure that the heat exchanger coil is NOT affected by the snow. If necessary, install a snow cover or shed and a pedestal.
For instructions on how to install the snow cover, contact your dealer.
When installing the snow cover, do NOT obstruct the air flow of the unit.
4.6. Combining Units and Options
The outdoor and indoor model can be combined as indicated in the following table.
Unit Compositions
Size 21kW
1x EWYT021CZI-A1 + 1x EWYT021CZO-A1
Size 32kW
1x EWYT032CZI-A1 + 1x EWYT032CZO-A1
Size 40kW
1x EWYT040CZI-A1 + 1x EWYT040CZO-A1
Size 64kW
1x EWYT064CZI-A2 + 1x EWYT064CZO-A2
4.7. Preparing Refrigerant Piping
The refrigerant R32 requires strict cautions for keeping the system clean, dry and tight.
▪Clean and dry: foreign materials (including mineral oils or moisture) should be prevented from
getting mixed into the system.
▪Tight: R32 does not contain any chlorine, does not destroy the ozone layer, and does not reduce
earth’s protection against harmful ultraviolet radiation. R32 can contribute slightly to the