Daikin EPRA10EAV3 How to use

Installer reference guide
Daikin Altherma 3 H MT ECH₂O
EPRA08EAV3
EPRA10EAV3
EPRA12EAV3
EPRA08EAW1
EPRA10EAW1
EPRA12EAW1
ETSH12P30EF
ETSH12P50EF
ETSHB12P30EF
ETSHB12P50EF
ETSX12P30EF
ETSX12P50EF
ETSXB12P30EF
ETSXB12P50EF
https://daikintechnicaldatahub.eu

Table of contents
Installer reference guide
2
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Table of contents
1 About the documentation 6
1.1 About this document ...................................................................................................................................................... 6
1.2 Meaning of warnings and symbols................................................................................................................................. 7
1.3 Installer reference guide at a glance .............................................................................................................................. 8
2 General safety precautions 10
2.1 For the installer............................................................................................................................................................... 10
2.1.1 General ........................................................................................................................................................... 10
2.1.2 Installation site ............................................................................................................................................... 11
2.1.3 Refrigerant — in case of R410A or R32.......................................................................................................... 11
2.1.4 Water .............................................................................................................................................................. 13
2.1.5 Electrical ......................................................................................................................................................... 13
3 Specific installer safety instructions 16
4 About the box 21
4.1 Outdoor unit ................................................................................................................................................................... 21
4.1.1 To handle the outdoor unit............................................................................................................................ 21
4.1.2 To unpack the outdoor unit ........................................................................................................................... 22
4.1.3 To remove the accessories from the outdoor unit........................................................................................ 23
4.2 Indoor unit ...................................................................................................................................................................... 24
4.2.1 To unpack the indoor unit.............................................................................................................................. 24
4.2.2 To remove the accessories from the indoor unit .......................................................................................... 25
4.2.3 To handle the indoor unit............................................................................................................................... 25
5 About the units and options 27
5.1 Overview: About the units and options.......................................................................................................................... 27
5.2 Identification ................................................................................................................................................................... 27
5.2.1 Identification label: Outdoor unit .................................................................................................................. 27
5.2.2 Identification label: Indoor unit ..................................................................................................................... 28
5.3 Combining units and options.......................................................................................................................................... 28
5.3.1 Possible combinations of indoor unit and outdoor unit................................................................................ 28
5.3.2 Possible options for the outdoor unit............................................................................................................ 29
5.3.3 Possible options for the indoor unit............................................................................................................... 29
6 Application guidelines 33
6.1 Overview: Application guidelines ................................................................................................................................... 33
6.2 Setting up the space heating/cooling system ................................................................................................................ 34
6.2.1 Single room..................................................................................................................................................... 35
6.2.2 Multiple rooms – OneLWT zone ................................................................................................................... 39
6.2.3 Multiple rooms – Two LWT zones.................................................................................................................. 44
6.3 Setting up bivalent heat sources .................................................................................................................................... 48
6.3.1 Setting up a direct auxiliary heat source for space heating .......................................................................... 48
6.3.2 Setting up an indirect auxiliary heat source for domestic hot water and space heating ............................. 51
6.3.3 Setting up a solar system via drainback connection...................................................................................... 52
6.3.4 Setting up a solar system via bivalent heat exchanger.................................................................................. 53
6.3.5 Setting up an electric backup heater ............................................................................................................. 54
6.4 Setting up the storage tank ............................................................................................................................................ 54
6.4.1 System layout – Integrated storage tank....................................................................................................... 54
6.4.2 Selecting the volume and desired temperature for the storage tank .......................................................... 54
6.4.3 Setup and configuration – storage tank......................................................................................................... 56
6.4.4 DHW pump for instant hot water .................................................................................................................. 56
6.4.5 DHW pump for disinfection ........................................................................................................................... 57
6.5 Setting up the energy metering...................................................................................................................................... 57
6.5.1 Produced heat ................................................................................................................................................ 58
6.5.2 Consumed energy........................................................................................................................................... 58
6.5.3 Normal kWh rate power supply ..................................................................................................................... 58
6.5.4 Preferential kWh rate power supply.............................................................................................................. 60
6.6 Setting up the power consumption control ................................................................................................................... 61
6.6.1 Permanent power limitation.......................................................................................................................... 61
6.6.2 Power limitation activated by digital inputs .................................................................................................. 62
6.6.3 Power limitation process................................................................................................................................ 63
6.6.4 BBR16 power limitation.................................................................................................................................. 64
6.7 Setting up an external temperature sensor ................................................................................................................... 64
7 Unit installation 66

Table of contents
Installer reference guide
3
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
7.1 Preparing the installation site......................................................................................................................................... 66
7.1.1 Installation site requirements of the outdoor unit........................................................................................ 66
7.1.2 Additional installation site requirements of the outdoor unit in cold climates............................................ 69
7.1.3 Installation site requirements of the indoor unit .......................................................................................... 69
7.2 Opening and closing the units ........................................................................................................................................ 71
7.2.1 About opening the units................................................................................................................................. 71
7.2.2 To open the outdoor unit............................................................................................................................... 71
7.2.3 To remove the transportation stay................................................................................................................ 71
7.2.4 To attach the compressor cover piece .......................................................................................................... 72
7.2.5 To close the outdoor unit............................................................................................................................... 72
7.2.6 To open the indoor unit ................................................................................................................................. 73
7.2.7 To lower the switch box of the indoor unit and remove the top cover........................................................ 74
7.2.8 To close the indoor unit ................................................................................................................................. 76
7.3 Mounting the outdoor unit............................................................................................................................................. 76
7.3.1 About mounting the outdoor unit ................................................................................................................. 76
7.3.2 Precautions when mounting the outdoor unit.............................................................................................. 76
7.3.3 To provide the installation structure ............................................................................................................. 76
7.3.4 To install the outdoor unit ............................................................................................................................. 77
7.3.5 To provide drainage........................................................................................................................................ 78
7.3.6 To install the discharge grille.......................................................................................................................... 80
7.3.7 To remove the discharge grille, and put the grille in safety position............................................................ 81
7.3.8 To prevent the outdoor unit from falling over .............................................................................................. 83
7.4 Mounting the indoor unit ............................................................................................................................................... 83
7.4.1 About mounting the indoor unit.................................................................................................................... 83
7.4.2 Precautions when mounting the indoor unit................................................................................................. 84
7.4.3 To install the indoor unit ................................................................................................................................ 84
7.4.4 To connect the drain hose to the drain ......................................................................................................... 84
8 Piping installation 86
8.1 Preparing water piping ................................................................................................................................................... 86
8.1.1 Water circuit requirements............................................................................................................................ 86
8.1.2 To check the water volume and flow rate ..................................................................................................... 89
8.2 Connecting water piping................................................................................................................................................. 90
8.2.1 About connecting the water piping ............................................................................................................... 90
8.2.2 Precautions when connecting the water piping............................................................................................ 90
8.2.3 To connect the water piping .......................................................................................................................... 90
8.2.4 To connect a pressure vessel ......................................................................................................................... 95
8.2.5 To fill the heating system ............................................................................................................................... 95
8.2.6 To protect the water circuit against freezing ................................................................................................ 97
8.2.7 To fill the heat exchanger inside the storage tank ........................................................................................ 100
8.2.8 To fill the storage tank.................................................................................................................................... 100
8.2.9 To insulate the water piping .......................................................................................................................... 102
9 Electrical installation 103
9.1 About connecting the electrical wiring .......................................................................................................................... 103
9.1.1 Precautions when connecting the electrical wiring....................................................................................... 103
9.1.2 Guidelines when connecting the electrical wiring......................................................................................... 104
9.1.3 About electrical compliance........................................................................................................................... 105
9.1.4 About preferential kWh rate power supply................................................................................................... 106
9.1.5 Overview of electrical connections except external actuators ..................................................................... 106
9.2 Connections to the outdoor unit.................................................................................................................................... 107
9.2.1 To connect the electrical wiring to the outdoor unit .................................................................................... 108
9.2.2 To reposition the air thermistor on the outdoor unit ................................................................................... 114
9.3 Connections to the indoor unit ...................................................................................................................................... 115
9.3.1 To connect the electrical wiring to the indoor unit....................................................................................... 117
9.3.2 To connect the main power supply................................................................................................................ 119
9.3.3 To connect the backup heater power supply ................................................................................................ 121
9.3.4 To connect the backup heater to the main unit............................................................................................ 124
9.3.5 To connect the shut-off valve ........................................................................................................................ 125
9.3.6 To connect the electricity meters .................................................................................................................. 126
9.3.7 To connect the domestic hot water pump .................................................................................................... 127
9.3.8 To connect the alarm output ......................................................................................................................... 128
9.3.9 To connect the space cooling/heating ON/OFF output................................................................................. 129
9.3.10 To connect the changeover to external heat source..................................................................................... 130
9.3.11 To connect the power consumption digital inputs........................................................................................ 131
9.3.12 To connect the safety thermostat (normally closed contact) ....................................................................... 133
9.3.13 To connect a Smart Grid................................................................................................................................. 134
9.3.14 To connect the WLAN cartridge (delivered as accessory)............................................................................. 139
9.3.15 To connect the solar input ............................................................................................................................. 140
9.3.16 To connect the DHW output .......................................................................................................................... 140

Table of contents
Installer reference guide
4
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
10 Configuration 142
10.1 Overview: Configuration................................................................................................................................................. 142
10.1.1 To access the most used commands ............................................................................................................. 143
10.1.2 To connect the PC cable to the switch box.................................................................................................... 145
10.2 Configuration wizard....................................................................................................................................................... 145
10.3 Possible screens .............................................................................................................................................................. 147
10.3.1 Possible screens: Overview ............................................................................................................................ 147
10.3.2 Home screen................................................................................................................................................... 148
10.3.3 Main menu screen.......................................................................................................................................... 150
10.3.4 Menu screen................................................................................................................................................... 151
10.3.5 Setpoint screen............................................................................................................................................... 151
10.3.6 Detailed screen with values ........................................................................................................................... 152
10.3.7 Schedule screen: Example.............................................................................................................................. 153
10.4 Weather-dependent curve ............................................................................................................................................. 157
10.4.1 What is a weather-dependent curve? ........................................................................................................... 157
10.4.2 2-points curve................................................................................................................................................. 157
10.4.3 Slope-offset curve........................................................................................................................................... 158
10.4.4 Using weather-dependent curves.................................................................................................................. 160
10.5 Settings menu ................................................................................................................................................................. 162
10.5.1 Malfunctioning ............................................................................................................................................... 162
10.5.2 Room............................................................................................................................................................... 162
10.5.3 Main zone ....................................................................................................................................................... 166
10.5.4 Additional zone............................................................................................................................................... 176
10.5.5 Space heating/cooling .................................................................................................................................... 181
10.5.6 Tank................................................................................................................................................................. 190
10.5.7 User settings ................................................................................................................................................... 195
10.5.8 Information..................................................................................................................................................... 200
10.5.9 Installer settings ............................................................................................................................................. 202
10.5.10 Commissioning ............................................................................................................................................... 229
10.5.11 User profile ..................................................................................................................................................... 229
10.5.12 Operation........................................................................................................................................................ 230
10.5.13 WLAN .............................................................................................................................................................. 230
10.6 Menu structure: Overview user settings........................................................................................................................ 232
10.7 Menu structure: Overview installer settings.................................................................................................................. 233
11 Commissioning 234
11.1 Overview: Commissioning .............................................................................................................................................. 234
11.2 Precautions when commissioning.................................................................................................................................. 235
11.3 Checklist before commissioning..................................................................................................................................... 235
11.4 Checklist during commissioning ..................................................................................................................................... 236
11.4.1 Minimum flow rate......................................................................................................................................... 236
11.4.2 Air purge function........................................................................................................................................... 237
11.4.3 Operation test run.......................................................................................................................................... 239
11.4.4 Actuator test run ............................................................................................................................................ 240
11.4.5 Underfloor heating screed dryout ................................................................................................................. 241
11.4.6 To set up bivalent heat sources ..................................................................................................................... 244
12 Hand-over to the user 245
13 Maintenance and service 246
13.1 Overview: Maintenance and service .............................................................................................................................. 246
13.2 Maintenance safety precautions.................................................................................................................................... 246
13.3 Yearly maintenance ........................................................................................................................................................ 247
13.3.1 Yearly maintenance outdoor unit: overview ................................................................................................. 247
13.3.2 Yearly maintenance outdoor unit: instructions............................................................................................. 247
13.3.3 Yearly maintenance indoor unit: overview.................................................................................................... 247
13.3.4 Yearly maintenance indoor unit: instructions ............................................................................................... 247
14 Troubleshooting 250
14.1 Overview: Troubleshooting ............................................................................................................................................ 250
14.2 Precautions when troubleshooting ................................................................................................................................ 250
14.3 Solving problems based on symptoms........................................................................................................................... 251
14.3.1 Symptom: The unit is NOT heating or cooling as expected........................................................................... 251
14.3.2 Symptom: Hot water does NOT reach the desired temperature.................................................................. 252
14.3.3 Symptom: The compressor does NOT start (space heating or domestic water heating) ............................ 252
14.3.4 Symptom: The system is making gurgling noises after commissioning ........................................................ 253
14.3.5 Symptom: The pump is blocked..................................................................................................................... 254
14.3.6 Symptom: The pump is making noise (cavitation)......................................................................................... 254
14.3.7 Symptom: The pressure relief valve opens.................................................................................................... 255
14.3.8 Symptom: The water pressure relief valve leaks........................................................................................... 255

Table of contents
Installer reference guide
5
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
14.3.9 Symptom: The space is NOT sufficiently heated at low outdoor temperatures........................................... 255
14.3.10 Symptom: Tank disinfection function is NOT completed correctly (AH-error)............................................. 256
14.4 Solving problems based on error codes......................................................................................................................... 257
14.4.1 To display the help text in case of a malfunction .......................................................................................... 257
14.4.2 Error codes: Overview .................................................................................................................................... 257
15 Disposal 262
15.1 To recover refrigerant..................................................................................................................................................... 262
15.1.1 To manually open the electronic expansion valves....................................................................................... 263
15.1.2 Recovery mode — In case of 3N~ models (7-segments display) .................................................................. 264
15.1.3 Recovery mode — In case of 1N~ models (7-LEDs display) .......................................................................... 266
15.2 To drain the storage tank ............................................................................................................................................... 267
15.2.1 To drain the storage tank without a connected pressureless solar system.................................................. 267
15.2.2 To drain the storage tank with a connected pressureless solar system ....................................................... 269
16 Technical data 271
16.1 Service space: Outdoor unit ........................................................................................................................................... 272
16.2 Piping diagram: Outdoor unit......................................................................................................................................... 273
16.3 Piping diagram: Indoor unit............................................................................................................................................ 274
16.4 Wiring diagram: Outdoor unit ........................................................................................................................................ 275
16.5 Wiring diagram: Indoor unit ........................................................................................................................................... 280
16.6 ESP curve: Indoor unit..................................................................................................................................................... 286
16.7 Name plate: Indoor unit ................................................................................................................................................. 286
17 Glossary 288
18 Field settings table 289

1 | About the documentation
Installer reference guide
6
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
1 About the documentation
In this chapter
1.1 About this document.............................................................................................................................................................. 6
1.2 Meaning of warnings and symbols......................................................................................................................................... 7
1.3 Installer reference guide at a glance...................................................................................................................................... 8
1.1 About this document
Target audience
Authorised installers
Documentation set
This document is part of a documentation set. The complete set consists of:
▪General safety precautions:
-Safety instructions that you must read before installing
-Format: Paper (in the box of the indoor unit)
▪Operation manual:
-Quick guide for basic usage
-Format: Paper (in the box of the indoor unit)
▪User reference guide:
-Detailed step-by-step instructions and background information for basic and
advanced usage
-Format: Digital files on https://www.daikin.eu. Use the search function to
find your model.
▪Installation manual – Outdoor unit:
-Installation instructions
-Format: Paper (in the box of the outdoor unit)
▪Installation manual – Indoor unit:
-Installation instructions
-Format: Paper (in the box of the indoor unit)
▪Installer reference guide:
-Preparation of the installation, good practices, reference data,…
-Format: Digital files on https://www.daikin.eu. Use the search function to
find your model.
▪Addendum book for optional equipment:
-Additional info about how to install optional equipment
-Format: Paper (in the box of the indoor unit) + Digital files on https://
www.daikin.eu. Use the search function to find your model.
Latest revisions of the supplied documentation may be available on the regional
Daikin website or via your dealer.
The original documentation is written in English. All other languages are
translations.

1 | About the documentation
Installer reference guide
7
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Technical engineering data
▪A subset of the latest technical data is available on the regional Daikin website
(publicly accessible).
▪The full set of latest technical data is available on the Daikin Business Portal
(authentication required).
Online tools
In addition to the documentation set, some online tools are available for installers:
▪Daikin Technical Data Hub
-Central hub for technical specifications of the unit, useful tools, digital
resources, and more.
-Publicly accessible via https://daikintechnicaldatahub.eu.
▪Heating Solutions Navigator
-Digital toolbox that offers a variety of tools to facilitate the installation and
configuration of heating systems.
-To access Heating Solutions Navigator, registration to the Stand By Me
platform is required. For more information, see https://
professional.standbyme.daikin.eu.
▪Daikin e-Care
-Mobile app for installers and service technicians that allows you to register,
configure and troubleshoot heating systems.
-The mobile app can be downloaded for iOS and Android devices using the QR
codes below. Registration to the Stand By Me platform is required to access
the app.
App Store Google Play
1.2 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
DANGER: RISK OF ELECTROCUTION
Indicates a situation that could result in electrocution.
DANGER: RISK OF BURNING/SCALDING
Indicates a situation that could result in burning/scalding because of extreme hot or
cold temperatures.
DANGER: RISK OF EXPLOSION
Indicates a situation that could result in explosion.

1 | About the documentation
Installer reference guide
8
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
Indicates a situation that could result in death or serious injury.
WARNING: FLAMMABLE MATERIAL
CAUTION
Indicates a situation that could result in minor or moderate injury.
NOTICE
Indicates a situation that could result in equipment or property damage.
INFORMATION
Indicates useful tips or additional information.
Symbols used on the unit:
Symbol Explanation
Before installation, read the installation and operation
manual, and the wiring instruction sheet.
Before performing maintenance and service tasks, read the
service manual.
For more information, see the installer and user reference
guide.
The unit contains rotating parts. Be careful when servicing or
inspecting the unit.
Symbols used in the documentation:
Symbol Explanation
Indicates a figure title or a reference to it.
Example: " 1–3 Figure title" means "Figure 3 in chapter 1".
Indicates a table title or a reference to it.
Example: " 1–3 Table title" means "Table 3 in chapter 1".
1.3 Installer reference guide at a glance
Chapter Description
About the documentation What documentation exists for the installer
General safety precautions Safety instructions that you must read before
installing
Specific installer safety
instructions
About the box How to unpack the units and remove their
accessories

1 | About the documentation
Installer reference guide
9
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Chapter Description
About the units and options ▪How to identify the units
▪Possible combinations of units and options
Application guidelines Various installation setups of the system
Unit installation What to do and know to install the system,
including information on how to prepare for an
installation
Piping installation What to do and know to install the piping of the
system, including information on how to
prepare for an installation
Electrical installation What to do and know to install the electrical
components of the system, including
information on how to prepare for an
installation
Configuration What to do and know to configure the system
after it is installed
Commissioning What to do and know to commission the system
after it is configured
Hand‑over to the user What to give and explain to the user
Maintenance and service How to maintain and service the units
Troubleshooting What to do in case of problems
Disposal How to dispose of the system
Technical data Specifications of the system
Glossary Definition of terms
Field settings table Table to be filled in by the installer, and kept for
future reference
Note: There is also an installer settings table in
the user reference guide. This table has to be
filled in by the installer and handed over to the
user.

2 | General safety precautions
Installer reference guide
10
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
2 General safety precautions
In this chapter
2.1 For the installer....................................................................................................................................................................... 10
2.1.1 General ................................................................................................................................................................... 10
2.1.2 Installation site ....................................................................................................................................................... 11
2.1.3 Refrigerant — in case of R410A or R32 ................................................................................................................. 11
2.1.4 Water...................................................................................................................................................................... 13
2.1.5 Electrical ................................................................................................................................................................. 13
2.1 For the installer
2.1.1 General
DANGER: RISK OF BURNING/SCALDING
▪Do NOT touch the refrigerant piping, water piping or internal parts during and
immediately after operation. It could be too hot or too cold. Give it time to return
to normal temperature. If you MUST touch it, wear protective gloves.
▪Do NOT touch any accidental leaking refrigerant.
WARNING
Improper installation or attachment of equipment or accessories could result in
electrical shock, short-circuit, leaks, fire or other damage to the equipment. ONLY
use accessories, optional equipment and spare parts made or approved by Daikin.
WARNING
Make sure installation, testing and applied materials comply with applicable
legislation (on top of the instructions described in the Daikin documentation).
WARNING
Tear apart and throw away plastic packaging bags so that nobody, especially
children, can play with them. Possible risk: suffocation.
WARNING
Provide adequate measures to prevent that the unit can be used as a shelter by small
animals. Small animals that make contact with electrical parts can cause
malfunctions, smoke or fire.
CAUTION
Wear adequate personal protective equipment (protective gloves, safety glasses,…)
when installing, maintaining or servicing the system.
CAUTION
Do NOT touch the air inlet or aluminium fins of the unit.
CAUTION
▪Do NOT place any objects or equipment on top of the unit.
▪Do NOT sit, climb or stand on the unit.

2 | General safety precautions
Installer reference guide
11
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
If you are NOT sure how to install or operate the unit, contact your dealer.
In accordance with the applicable legislation, it might be necessary to provide a
logbook with the product containing at least: information on maintenance, repair
work, results of tests, stand-by periods,…
Also, at least, following information MUST be provided at an accessible place at the
product:
▪Instructions for shutting down the system in case of an emergency
▪Name and address of fire department, police and hospital
▪Name, address and day and night telephone numbers for obtaining service
In Europe, EN378 provides the necessary guidance for this logbook.
2.1.2 Installation site
▪Provide sufficient space around the unit for servicing and air circulation.
▪Make sure the installation site withstands the weight and vibration of the unit.
▪Make sure the area is well ventilated. Do NOT block any ventilation openings.
▪Make sure the unit is level.
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 the refrigerant to leak.
2.1.3 Refrigerant — in case of R410A or R32
If applicable. See the installation manual or installer reference guide of your
application for more information.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump down the system, and there
is a leak in the refrigerant circuit:
▪Do NOT use the unit's automatic pump down function, with which you can collect
all refrigerant from the system into the outdoor unit. Possible consequence: Self-
combustion and explosion of the compressor because of air going into the
operating compressor.
▪Use a separate recovery system so that the unit's compressor does NOT have to
operate.
WARNING
During tests, NEVER pressurise the product with a pressure higher than the
maximum allowable pressure (as indicated on the nameplate of the unit).

2 | General safety precautions
Installer reference guide
12
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
Take sufficient precautions in case of refrigerant leakage. If refrigerant gas leaks,
ventilate the area immediately. Possible risks:
▪Excessive refrigerant concentrations in a closed room can lead to oxygen
deficiency.
▪Toxic gas might be produced if refrigerant gas comes into contact with fire.
WARNING
ALWAYS recover the refrigerant. Do NOT release them directly into the environment.
Use a vacuum pump to evacuate the installation.
WARNING
Make sure there is no oxygen in the system. Refrigerant may ONLY be charged after
performing the leak test and the vacuum drying.
Possible consequence: Self-combustion and explosion of the compressor because of
oxygen going into the operating compressor.
NOTICE
▪To avoid compressor breakdown, do NOT charge more than the specified amount
of refrigerant.
▪When the refrigerant system is to be opened, refrigerant MUST be treated
according to the applicable legislation.
NOTICE
Make sure refrigerant piping installation complies with applicable legislation. In
Europe, EN378 is the applicable standard.
NOTICE
Make sure the field piping and connections are NOT subjected to stress.
NOTICE
After all the piping has been connected, make sure there is no gas leak. Use nitrogen
to perform a gas leak detection.
▪In case recharge is required, see the nameplate of the unit. It states the type of
refrigerant and necessary amount.
▪The unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some systems require additional charging of refrigerant.
▪ONLY use tools exclusively for the refrigerant type used in the system, this to
ensure pressure resistance and prevent foreign materials from entering into the
system.
▪Charge the liquid refrigerant as follows:
If Then
A siphon tube is present
(i.e., the cylinder is marked with "Liquid
filling siphon attached")
Charge with the cylinder upright.

2 | General safety precautions
Installer reference guide
13
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
If Then
A siphon tube is NOT present Charge with the cylinder upside down.
▪Open refrigerant cylinders slowly.
▪Charge the refrigerant in liquid form. Adding it in gas form may prevent normal
operation.
CAUTION
When the refrigerant charging procedure is done or when pausing, close the valve of
the refrigerant tank immediately. If the valve is NOT closed immediately, remaining
pressure might charge additional refrigerant. Possible consequence: Incorrect
refrigerant amount.
2.1.4 Water
If applicable. See the installation manual or installer reference guide of your
application for more information.
NOTICE
Make sure water quality complies with EU directive 2020/2184.
2.1.5 Electrical
DANGER: RISK OF ELECTROCUTION
▪Turn OFF all power supply before removing the switch box cover, connecting
electrical wiring or touching electrical parts.
▪Disconnect the power supply for more than 10minutes, and measure the voltage
at the terminals of main circuit capacitors or electrical components before
servicing. The voltage MUST be less than 50VDC before you can touch electrical
components. For the location of the terminals, see the wiring diagram.
▪Do NOT touch electrical components with wet hands.
▪Do NOT leave the unit unattended when the service cover is removed.
WARNING
If NOT factory installed, a main switch or other means for disconnection, having a
contact separation in all poles providing full disconnection under overvoltage
categoryIII condition, MUST be installed in the fixed wiring.

2 | General safety precautions
Installer reference guide
14
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
▪ONLY use copper wires.
▪Make sure the field wiring complies with the applicable legislation.
▪All field wiring MUST be performed in accordance with the wiring diagram
supplied with the product.
▪NEVER squeeze bundled cables and make sure they do NOT come in contact with
the piping and sharp edges. Make sure no external pressure is applied to the
terminal connections.
▪Make sure to install earth wiring. Do NOT earth the unit to a utility pipe, surge
absorber, or telephone earth. Incomplete earth may cause electrical shock.
▪Make sure to use a dedicated power circuit. NEVER use a power supply shared by
another appliance.
▪Make sure to install the required fuses or circuit breakers.
▪Make sure to install an earth leakage protector. Failure to do so may cause
electrical shock or fire.
▪When installing the earth leakage protector, make sure it is compatible with the
inverter (resistant to high frequency electric noise) to avoid unnecessary opening
of the earth leakage protector.
WARNING
▪After finishing the electrical work, confirm that each electrical component and
terminal inside the electrical components box is connected securely.
▪Make sure all covers are closed before starting up the unit.
CAUTION
▪When connecting the power supply: connect the earth cable first, before making
the current-carrying connections.
▪When disconnecting the power supply: disconnect the current-carrying cables
first, before separating the earth connection.
▪The length of the conductors between the power supply stress relief and the
terminal block itself MUST be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply is pulled loose from
the stress relief.
NOTICE
Precautions when laying power wiring:
▪Do NOT connect wiring of different thicknesses to the power terminal block (slack
in the power wiring may cause abnormal heat).
▪When connecting wiring which is the same thickness, do as shown in the figure
above.
▪For wiring, use the designated power wire and connect firmly, then secure to
prevent outside pressure being exerted on the terminal board.
▪Use an appropriate screwdriver for tightening the terminal screws. A screwdriver
with a small head will damage the head and make proper tightening impossible.
▪Over-tightening the terminal screws may break them.

2 | General safety precautions
Installer reference guide
15
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Install power cables at least 1 meter away from televisions or radios to prevent
interference. Depending on the radio waves, a distance of 1 meter may NOT be
sufficient.
NOTICE
ONLY applicable if the power supply is three‑phase, and the compressor has an ON/
OFF starting method.
If there exists the possibility of reversed phase after a momentary black out and the
power goes ON and OFF while the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed phase can break the
compressor and other parts.

3 | Specific installer safety instructions
Installer reference guide
16
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
3 Specific installer safety instructions
Always observe the following safety instructions and regulations.
Handling the unit (see "4.1.1To handle the outdoor unit"[ 4
21])
CAUTION
To avoid injury, do NOT touch the air inlet or aluminium fins of the unit.
Application guidelines (see "6Application guidelines"[ 4
33])
CAUTION
If there is more than one leaving water zone, ALWAYS install a mixing valve station in
the main zone to decrease (in heating)/increase (in cooling) the leaving water
temperature when the additional zone has demand.
CAUTION
The solar panels MUST be installed higher than the indoor unit. A downward slope
with minimum gradient of the solar piping MUST be guaranteed. This is to allow the
solar system to completely drain and thereby to avoid frost damages.
Installation site (see "7.1Preparing the installation site"[ 4
66])
WARNING
Follow the service space dimensions in this manual for correct installation of the unit.
See "16.1Service space: Outdoor unit"[4272].
WARNING
Follow the service space dimensions in this manual for correct installation of the unit.
See "7.1.3Installation site requirements of the indoor unit"[469].
CAUTION
Install the indoor unit at a minimum distance of 1m from other heat sources (>80°C)
(e.g. electrical heater, oil heater, chimney) and combustible materials. Otherwise the
unit may be damaged or in extreme cases catch fire.
Special requirements for R32 (see "7.1.1Installation site requirements of the
outdoor unit"[
4
66])
WARNING
▪Do NOT pierce or burn refrigerant cycle parts.
▪Do NOT use means to accelerate the defrosting process or to clean the
equipment, other than those recommended by the manufacturer.
▪Be aware that R32 refrigerant does NOT contain an odour.
WARNING
The appliance shall be stored so as to prevent mechanical damage and in a well-
ventilated room without continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric heater).

3 | Specific installer safety instructions
Installer reference guide
17
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
Make sure installation, servicing, maintenance and repair comply with instructions
from Daikin and with applicable legislation and are executed ONLY by authorised
persons.
Mounting the outdoor unit (see "7.3Mounting the outdoor unit"[ 4
76])
WARNING
Fixing method of the outdoor unit MUST be in accordance with the instructions from
this manual. See "7.3Mounting the outdoor unit"[476].
Mounting the indoor unit (see "7.4Mounting the indoor unit"[ 4
83])
WARNING
Fixing method of the indoor unit MUST be in accordance with the instructions from
this manual. See "7.4Mounting the indoor unit"[483].
Opening and closing the units (see "7.2Opening and closing the units"[ 4
71])
DANGER: RISK OF ELECTROCUTION
Do NOT leave the unit unattended when the service cover is removed.
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
Piping installation (see "8Piping installation"[ 4
86])
DANGER: RISK OF ELECTROCUTION
During the filling process, water can escape from any leaking point and can cause an
electrical shock if it comes into contact with live parts.
▪Before the filling process, de-energise the unit.
▪After the first filling and before switching on the unit with the mains switch, check
whether all electric parts and connection points are dry.
WARNING
The field piping method MUST be in accordance with the instructions from this
manual. See "8Piping installation"[486].
WARNING
The discharge pipes from the pressure relief valves MUST terminate in a safe and
visible position without forming any risk to persons in the vicinity.
WARNING
▪Discharge piping, tundish, drain valves, etc. MUST be positioned away from any
electrical components.
▪The discharge pipe away from the tundish MUST terminate in a safe, visible
position without forming any risk to persons in the vicinity.

3 | Specific installer safety instructions
Installer reference guide
18
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
Install the tundish away from any electrical device. Possible consequence: Electrical
shock or fire.
In case of freeze protection by glycol:
WARNING
Due to the presence of glycol, corrosion of the system is possible. Uninhibited glycol
will turn acidic under the influence of oxygen. This process is accelerated by the
presence of copper and high temperatures. The acidic uninhibited glycol attacks
metal surfaces and forms galvanic corrosion cells that cause severe damage to the
system. Therefore it is important that:
▪the water treatment is correctly executed by a qualified water specialist,
▪a glycol with corrosion inhibitors is selected to counteract acids formed by the
oxidation of glycols,
▪no automotive glycol is used because their corrosion inhibitors have a limited
lifetime and contain silicates which can foul or plug the system,
▪galvanized pipes are NOT used in glycol systems since the presence may lead to
the precipitation of certain components in the glycol's corrosion inhibitor.
Electrical installation (see "9Electrical installation"[ 4
103])
DANGER: RISK OF ELECTROCUTION
WARNING
Electrical wiring connection method MUST be in accordance with the instructions
from:
▪This manual. See "9Electrical installation"[4103].
▪The wiring diagram, which is delivered with the unit, located at the inside of the
service cover. For a translation of its legend, see "16.4Wiring diagram: Outdoor
unit"[4275].
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
▪All wiring MUST be performed by an authorised electrician and MUST comply
with the applicable legislation.
▪Make electrical connections to the fixed wiring.
▪All components procured on-site and all electrical construction MUST comply
with the applicable legislation.

3 | Specific installer safety instructions
Installer reference guide
19
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
WARNING
▪If the power supply has a missing or wrong N-phase, equipment might break
down.
▪Establish proper earthing. Do NOT earth the unit to a utility pipe, surge absorber,
or telephone earth. Incomplete earthing may cause electrical shock.
▪Install the required fuses or circuit breakers.
▪Secure the electrical wiring with cable ties so that the cables do NOT come in
contact with sharp edges or piping, particularly on the high-pressure side.
▪Do NOT use taped wires, stranded conductor wires, extension cords, or
connections from a star system. They can cause overheating, electrical shock or
fire.
▪Do NOT install a phase advancing capacitor, because this unit is equipped with an
inverter. A phase advancing capacitor will reduce performance and may cause
accidents.
WARNING
Rotating fan. Before powering ON or servicing the outdoor unit, make sure that the
discharge grille covers the fan as protection against a rotating fan. See:
▪"7.3.6To install the discharge grille"[480]
▪"7.3.7To remove the discharge grille, and put the grille in safety position"[481]
WARNING
The backup heater MUST have a dedicated power supply and MUST be protected by
the safety devices required by the applicable legislation.
WARNING
If the supply cord is damaged, it MUST be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
CAUTION
Do NOT push or place redundant cable length into the unit.
CAUTION
To guarantee the unit is completely earthed, ALWAYS connect the backup heater
power supply and the earth cable.
INFORMATION
Details of type and rating of fuses, or rating of circuit breakers are described in
"9Electrical installation"[4103].
Configuration (see "10Configuration"[ 4
142])
WARNING
Be aware that the domestic hot water temperature at the hot water tap will be equal
to the value selected in field setting [2-03] after a disinfection operation.
When the high domestic hot water temperature can be a potential risk for human
injuries, a mixing valve (field supply) shall be installed at the domestic hot water out
connection of the storage tank. This mixing valve shall secure that the hot water
temperature at the hot water tap never rise above a set maximum value. This
maximum allowable hot water temperature shall be selected according to the
applicable legislation.

3 | Specific installer safety instructions
Installer reference guide
20
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
CAUTION
The disinfection function settings MUST be configured by the installer according to
the applicable legislation.
CAUTION
Make sure that the disinfection function start time [5.7.3] with defined duration
[5.7.5] is NOT interrupted by possible domestic hot water demand.
Commissioning (see "11Commissioning"[ 4
234])
WARNING
Commissioning method MUST be in accordance with the instructions from this
manual. See "11Commissioning"[4234].
Maintenance and service (see "13Maintenance and service"[ 4
246])
DANGER: RISK OF BURNING/SCALDING
The water in the storage tank and all the connected piping can be very hot.
WARNING
If the internal wiring is damaged, it has to be replaced by the manufacturer, its
service agent or similarly qualified persons.
Troubleshooting (see "14Troubleshooting"[ 4
250])
DANGER: RISK OF BURNING/SCALDING
WARNING
▪When carrying out an inspection on the switch box of the unit, ALWAYS make
sure that the unit is disconnected from the mains. Turn off the respective circuit
breaker.
▪When a safety device was activated, stop the unit and find out why the safety
device was activated before resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default setting. If you are unable to
find the cause of the problem, call your dealer.
WARNING
Prevent hazards due to inadvertent resetting of the thermal cut-out: power to this
appliance MUST NOT be supplied through an external switching device, such as a
timer, or connected to a circuit that is regularly turned ON and OFF by the utility.
WARNING
Air purging heat emitters or collectors. Before you purge air from heat emitters or
collectors, check if or is displayed on the home screen of the user interface.
▪If not, you can purge air immediately.
▪If yes, make sure that the room where you want to purge air is sufficiently
ventilated. Reason: Refrigerant might leak into the water circuit, and
subsequently into the room when you purge air from the heat emitters or
collectors.