co₂ conveni-pack: indoor unit · 2021. 1. 7. · excessive refrigerant concentrations in a closed...

Installer and user reference guide

CO₂ Conveni-Pack: indoor unit

FXSN50A2VEBFXSN71A2VEBFXSN112A2VEB

Table of contents


2FXSN50~112A2VEB

CO₂ Conveni-Pack: indoor unit4P602817-1A – 2020.05

Table of contents1 About the documentation 4

1.1 About this document ...................................................................................................................................................... 4

2 General safety precautions 52.1 About the documentation .............................................................................................................................................. 5

2.1.1 Meaning of warnings and symbols ................................................................................................................ 52.2 For the installer ............................................................................................................................................................... 6

2.2.1 General ........................................................................................................................................................... 62.2.2 Installation site ............................................................................................................................................... 72.2.3 Refrigerant...................................................................................................................................................... 72.2.4 Brine................................................................................................................................................................ 92.2.5 Water .............................................................................................................................................................. 102.2.6 Electrical ......................................................................................................................................................... 10

3 Specific installer safety instructions 12

For the user 15

4 User safety instructions 164.1 General............................................................................................................................................................................ 164.2 Instructions for safe operation ....................................................................................................................................... 17

5 About the system 215.1 System layout.................................................................................................................................................................. 215.2 Information requirements for fan coil units................................................................................................................... 22

6 User interface 23

7 Before operation 24

8 Operation 258.1 Operation range.............................................................................................................................................................. 258.2 About operation modes.................................................................................................................................................. 25

8.2.1 Basic operation modes ................................................................................................................................... 258.2.2 Special heating operation modes................................................................................................................... 26

8.3 To operate the system.................................................................................................................................................... 26

9 Energy saving and optimum operation 27

10 Maintenance and service 2810.1 Precautions for maintenance and service...................................................................................................................... 2810.2 Cleaning the air filter and air outlet ............................................................................................................................... 29

10.2.1 To clean the air outlet .................................................................................................................................... 2910.2.2 To clean the air filter ...................................................................................................................................... 29

10.3 Maintenance before a long stop period......................................................................................................................... 3010.4 Maintenance after a long stop period............................................................................................................................ 3010.5 About the refrigerant...................................................................................................................................................... 30

10.5.1 About refrigerant leak detection ................................................................................................................... 31

11 Troubleshooting 3311.1 Symptoms that are NOT system malfunctions............................................................................................................... 34

11.1.1 Symptom: The system does not operate....................................................................................................... 3411.1.2 Symptom: Dust comes out of the unit........................................................................................................... 3511.1.3 Symptom: The units can give off odours ....................................................................................................... 35

12 Disposal 36

For the installer 37

13 About the box 3813.1 Overview: About the box ................................................................................................................................................ 3813.2 Indoor unit ...................................................................................................................................................................... 38

13.2.1 To unpack and handle the unit ...................................................................................................................... 3813.2.2 To remove the accessories from the indoor unit .......................................................................................... 38

14 About the units and options 40

Table of contents


3FXSN50~112A2VEBCO₂ Conveni-Pack: indoor unit4P602817-1A – 2020.05

14.1 Identification ................................................................................................................................................................... 4014.1.1 Identification label: Indoor unit ..................................................................................................................... 40

14.2 About the indoor unit ..................................................................................................................................................... 4014.3 System layout.................................................................................................................................................................. 4014.4 Combining units and options.......................................................................................................................................... 41

14.4.1 Possible options for the indoor unit............................................................................................................... 41

15 Unit installation 4215.1 Preparing the installation site......................................................................................................................................... 42

15.1.1 Installation site requirements of the indoor unit .......................................................................................... 4215.1.2 Additional installation site requirements for CO₂ refrigerant ....................................................................... 45

15.2 Mounting the indoor unit ............................................................................................................................................... 5015.2.1 Guidelines when installing the indoor unit .................................................................................................... 5015.2.2 Guidelines when installing the ducting.......................................................................................................... 5215.2.3 Guidelines when installing the drain piping................................................................................................... 52

15.3 Relocation ....................................................................................................................................................................... 56

16 Piping installation 5716.1 Preparing refrigerant piping ........................................................................................................................................... 57

16.1.1 Refrigerant piping requirements.................................................................................................................... 5716.1.2 Refrigerant piping insulation.......................................................................................................................... 58

16.2 Connecting the refrigerant piping .................................................................................................................................. 5816.2.1 About connecting the refrigerant piping ....................................................................................................... 5816.2.2 Precautions when connecting the refrigerant piping.................................................................................... 5816.2.3 Pipe bending guidelines ................................................................................................................................. 5916.2.4 Guidelines when connecting the refrigerant piping...................................................................................... 5916.2.5 To connect the refrigerant piping to the indoor unit .................................................................................... 60

17 Electrical installation 6217.1 About connecting the electrical wiring .......................................................................................................................... 62

17.1.1 Precautions when connecting the electrical wiring....................................................................................... 6217.1.2 Guidelines when connecting the electrical wiring......................................................................................... 6317.1.3 Specifications of standard wiring components.............................................................................................. 64

17.2 To connect the electrical wiring to the indoor unit ....................................................................................................... 6417.3 To connect appropriate measures for appliances filled with CO₂ ................................................................................. 66

18 Commissioning 6818.1 Precautions when commissioning.................................................................................................................................. 6818.2 Checklist before commissioning..................................................................................................................................... 6818.3 To perform a test run...................................................................................................................................................... 6918.4 Error codes when performing a test run........................................................................................................................ 69

19 Configuration 7019.1 Field setting..................................................................................................................................................................... 70

20 Hand-over to the user 73

21 Disposal 74

22 Technical data 7522.1 Wiring diagram................................................................................................................................................................ 75

22.1.1 Unified wiring diagram legend ....................................................................................................................... 75

23 Glossary 78

1 | About the documentation


4FXSN50~112A2VEB


1 About the documentation

1.1 About this document

INFORMATIONMake sure that the user has the printed documentation and ask him/her to keep itfor future reference.

Target audience

Authorised installers + end users

INFORMATIONThis appliance is intended to be used by expert or trained users in shops, in lightindustry and on farms, or for commercial use by lay persons.

WARNINGMake sure installation, servicing, maintenance, repair and applied materials followthe instructions from Daikin and, in addition, comply with applicable legislation andare performed by qualified persons only. In Europe and areas where IEC standardsapply, EN/IEC 60335-2-40 is the applicable standard.

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)

▪ Indoor unit installation and operation manual:- Installation and operation instructions- Format: Paper (in the box of the indoor unit)

▪ Installer and user reference guide:- Preparation of the installation, good practices, reference data,…- Detailed step-by-step instructions and background information for basic and

advanced usage

- Format: Digital files on http://www.daikineurope.com/support-and-manuals/product-information/

Latest revisions of the supplied documentation may be available on the regionalDaikin website or via your dealer.

The original documentation is written in English. All other languages aretranslations.

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).

http://www.daikineurope.com/support-and-manuals/product-information/http://www.daikineurope.com/support-and-manuals/product-information/

2 | General safety precautions



2 General safety precautions

2.1 About the documentation

▪ The original documentation is written in English. All other languages aretranslations.

▪ The precautions described in this document cover very important topics, followthem carefully.

▪ The installation of the system, and all activities described in the installationmanual and in the installer reference guide MUST be performed by an authorisedinstaller.

2.1.1 Meaning of warnings and symbols

DANGERIndicates a situation that results in death or serious injury.

DANGER: RISK OF ELECTROCUTIONIndicates a situation that could result in electrocution.

DANGER: RISK OF BURNING/SCALDINGIndicates a situation that could result in burning/scalding because of extreme hot orcold temperatures.

DANGER: RISK OF EXPLOSIONIndicates a situation that could result in explosion.

WARNINGIndicates a situation that could result in death or serious injury.

WARNING: FLAMMABLE MATERIAL

CAUTIONIndicates a situation that could result in minor or moderate injury.

NOTICEIndicates a situation that could result in equipment or property damage.

INFORMATIONIndicates useful tips or additional information.

Symbols used on the unit:



6FXSN50~112A2VEB


Symbol Explanation

Before installation, read the installation and operationmanual, and the wiring instruction sheet.

Before performing maintenance and service tasks, read theservice manual.

For more information, see the installer and user referenceguide.

The unit contains rotating parts. Be careful when servicing orinspecting 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".

2.2 For the installer

2.2.1 General

If you are NOT sure how to install or operate the unit, contact your dealer.

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 returnto normal temperature. If you must touch it, wear protective gloves.

▪ Do NOT touch any accidental leaking refrigerant.

WARNINGImproper installation or attachment of equipment or accessories could result inelectrical shock, short-circuit, leaks, fire or other damage to the equipment. Only useaccessories, optional equipment and spare parts made or approved by Daikin.

WARNINGMake sure installation, testing and applied materials comply with applicablelegislation (on top of the instructions described in the Daikin documentation).

CAUTIONWear adequate personal protective equipment (protective gloves, safety glasses,…)when installing, maintaining or servicing the system.

WARNINGTear apart and throw away plastic packaging bags so that nobody, especiallychildren, can play with them. Possible risk: suffocation.




WARNINGProvide adequate measures to prevent that the unit can be used as a shelter by smallanimals. Small animals that make contact with electrical parts can causemalfunctions, smoke or fire.

CAUTIONDo 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.

NOTICEWorks executed on the outdoor unit are best done under dry weather conditions toavoid water ingress.

In accordance with the applicable legislation, it might be necessary to provide alogbook with the product containing at least: information on maintenance, repairwork, results of tests, stand-by periods,…

Also, at least, following information MUST be provided at an accessible place at theproduct:

▪ 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 serviceIn Europe, EN378 provides the necessary guidance for this logbook.

2.2.2 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 ofthe 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.

2.2.3 Refrigerant

If applicable. See the installation manual or installer reference guide of yourapplication for more information.



8FXSN50~112A2VEB


NOTICEMake sure refrigerant piping installation complies with applicable legislation. InEurope, EN378 is the applicable standard.

NOTICEMake sure the field piping and connections are NOT subjected to stress.

WARNINGDuring tests, NEVER pressurize the product with a pressure higher than themaximum allowable pressure (as indicated on the nameplate of the unit).

WARNINGTake 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 oxygendeficiency.

▪ In case of R410A or R32 refrigerant: Toxic gas might be produced if refrigerantgas comes into contact with fire.

▪ In case of CO2 refrigerant: Refrigerant gas is toxic in high concentrations.

DANGER: RISK OF EXPLOSIONPump down – Refrigerant leakage. If you want to pump down the system, and thereis a leak in the refrigerant circuit:

▪ Do NOT use the unit's automatic pump down function, with which you can collectall refrigerant from the system into the outdoor unit. Possible consequence: Self-combustion and explosion of the compressor because of air going into theoperating compressor.

▪ Use a separate recovery system so that the unit's compressor does NOT have tooperate.

WARNINGALWAYS recover the refrigerant. Do NOT release them directly into the environment.Use a vacuum pump to evacuate the installation.

NOTICEAfter all the piping has been connected, make sure there is no gas leak. Use nitrogento perform a gas leak detection.

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 treatedaccording to the applicable legislation.

WARNINGMake sure there is no oxygen in the system. Refrigerant may only be charged afterperforming the leak test and the vacuum drying.

Possible consequence: Self-combustion and explosion of the compressor because ofoxygen going into the operating compressor.




▪ In case recharge is required, see the nameplate of the unit. It states the type ofrefrigerant and necessary amount.

▪ The unit is factory charged with refrigerant and depending on pipe sizes and pipelengths some systems require additional charging of refrigerant.

▪ Only use tools exclusively for the refrigerant type used in the system, this toensure pressure resistance and prevent foreign materials from entering into thesystem.

▪ Charge the liquid refrigerant as follows:If Then

A siphon tube is present

(i.e., the cylinder is marked with "Liquidfilling siphon attached")

Charge with the cylinder upright.

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.

CAUTIONWhen the refrigerant charging procedure is done or when pausing, close the valve ofthe refrigerant tank immediately. If the valve is NOT closed immediately, remainingpressure might charge additional refrigerant. Possible consequence: Incorrectrefrigerant amount.

2.2.4 Brine


WARNINGThe selection of the brine MUST be in accordance with the applicable legislation.

WARNINGTake sufficient precautions in case of brine leakage. If brine leaks, ventilate the areaimmediately and contact your local dealer.

WARNINGThe ambient temperature inside the unit can get much higher than that of the room,e.g. 70°C. In case of a brine leak, hot parts inside the unit can create a hazardoussituation.

WARNINGThe use and installation of the application MUST comply with the safety andenvironmental precautions specified in the applicable legislation.



10FXSN50~112A2VEB


2.2.5 Water


NOTICEMake sure water quality complies with EU directive 98/83 EC.

2.2.6 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 1 minute, and measure the voltage atthe terminals of main circuit capacitors or electrical components before servicing.The voltage MUST be less than 50 V DC before you can touch electricalcomponents. 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.

WARNINGIf NOT factory installed, a main switch or other means for disconnection, having acontact separation in all poles providing full disconnection under overvoltagecategory III condition, MUST be installed in the fixed wiring.

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 withthe piping and sharp edges. Make sure no external pressure is applied to theterminal connections.

▪ Make sure to install earth wiring. Do NOT earth the unit to a utility pipe, surgeabsorber, or telephone earth. Incomplete earth may cause electrical shock.

▪ Make sure to use a dedicated power circuit. NEVER use a power supply shared byanother 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 theinverter (resistant to high frequency electric noise) to avoid unnecessary openingof the earth leakage protector.




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 cablesfirst, before separating the earth connection.

▪ The length of the conductors between the power supply stress relief and theterminal block itself must be as such that the current-carrying wires are tautenedbefore the earth wire is in case the power supply is pulled loose from the stressrelief.

NOTICEPrecautions when laying power wiring:

▪ Do NOT connect wiring of different thicknesses to the power terminal block (slackin the power wiring may cause abnormal heat).

▪ When connecting wiring which is the same thickness, do as shown in the figureabove.

▪ For wiring, use the designated power wire and connect firmly, then secure toprevent outside pressure being exerted on the terminal board.

▪ Use an appropriate screwdriver for tightening the terminal screws. A screwdriverwith a small head will damage the head and make proper tightening impossible.

▪ Over-tightening the terminal screws may break them.

Install power cables at least 1 m away from televisions or radios to preventinterference. Depending on the radio waves, a distance of 1 m may not besufficient.

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.

NOTICEOnly 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 thepower goes on and off while the product is operating, attach a reversed phaseprotection circuit locally. Running the product in reversed phase can break thecompressor and other parts.

3 | Specific installer safety instructions


12FXSN50~112A2VEB


3 Specific installer safety instructionsAlways observe the following safety instructions and regulations.

CAUTIONDo NOT insert fingers, rods or other objects into the air inlet or outlet. When the fanis rotating at high speed, it will cause injury.

General installation requirements

WARNINGInstallation shall be done by an installer, the choice of materials and installation shallcomply with the applicable legislation. In Europe, EN378 is the applicable standard.

WARNING▪ Make sure to install all necessary countermeasures in case of refrigerant leakage

according to standard EN378 (see "15.1.2 Additional installation siterequirements for CO₂ refrigerant" [4 45]).

▪ Make sure to install a CO2 leak detector (field supply) and enable the function forrefrigerant leak detection (see "19.1 Field setting" [4 70]).

WARNINGMake sure installation, servicing, maintenance, repair and applied materials followthe instructions from Daikin and, in addition, comply with applicable legislation andare performed by qualified persons only. In Europe and areas where IEC standardsapply, EN/IEC 60335-2-40 is the applicable standard.

Installation site (see "15.1 Preparing the installation site" [4 42])

CAUTIONAppliance not accessible to the general public, install it in a secured area, protectedfrom easy access.

This unit, both indoor and outdoor, is suitable for installation in a commercial andlight industrial environment.

WARNINGDo NOT place objects below the indoor and/or outdoor unit that may get wet.Otherwise condensation on the main unit or refrigerant pipes, air filter dirt or drainblockage may cause dripping, and objects under the unit may get dirty or damaged.

WARNINGInstall the unit only in locations where the doors of the occupied space are not tightfitting.

WARNINGWhen using safety shut-off valves, make sure to install measures such as a bypassingpiping with a pressure relief valve (from liquid pipe to gas pipe). When the safetyshut-off valves close and no measures are installed, increased pressure may damagethe liquid piping.




Installing the ducting (see "15.2.2 Guidelines when installing the ducting" [4 52])

CAUTION▪ Make sure the installation of the duct does NOT exceed the setting range of the

external static pressure for the unit. Refer to the technical datasheet of yourmodel for the setting range.

▪ Make sure to install the canvas duct so vibrations are NOT transmitted to theduct or ceiling. Use a sound-absorbing material (insulation material) for the liningof the duct and apply vibration insulation rubber to the hanging bolts.

▪ When welding, make sure NOT to spatter onto the drain pan or the air filter.▪ If the metal duct passes through a metal lath, wire lath or metal plate of the

wooden structure, separate the duct and wall electrically.

▪ Install the outlet grille in a position where the airflow will not come into directcontact with people.

▪ Do NOT use booster fans in the duct. Use the function to adjust the fan ratesetting automatically (see "19.1 Field setting" [4 70]).

Refrigerant piping installation (see "16 Piping installation" [4 57])

CAUTIONDo NOT reuse piping from previous installations.

CAUTIONInstall the refrigerant piping or components in a position where they are unlikely tobe exposed to any substance which may corrode components containing refrigerant,unless the components are constructed of materials that are inherently resistant tocorrosion or are suitably protected against corrosion.

WARNING▪ Use K65 piping for high-pressure applications with a working pressure of 120 bar

or 90 bar, depending on its location in the system.

▪ Use K65 unions and fittings approved for a working pressure of 120 bar or 90 bar,depending on its location in the system.

▪ Only brazing is allowed for connection of pipes. No other types of connections areallowed.

▪ Expanding of pipes is not allowed.

Electrical installation (see "17 Electrical installation" [4 62])

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 into

contact with sharp edges or piping, particularly on the high-pressure side.

▪ Do NOT use taped wires, stranded conductor wires, extension cords, orconnections from a star system. They can cause overheating, electrical shock orfire.



14FXSN50~112A2VEB


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.

WARNINGALWAYS use multicore cable for power supply cables.

WARNINGUse an all-pole disconnection type breaker with at least 3 mm between the contactpoint gaps that provide full disconnection under overvoltage category III.

WARNINGIf the supply cord is damaged, it MUST be replaced by the manufacturer, its serviceagent or similarly qualified persons in order to avoid a hazard.

For the user



For t

he u

ser

For the user

4 | User safety instructions


16FXSN50~112A2VEB


4 User safety instructionsAlways observe the following safety instructions and regulations.

4.1 General

WARNINGIf you are NOT sure how to operate the unit, contact yourinstaller.

WARNINGThis appliance is not intended for use by persons, includingchildren, with reduced physical, sensory or mentalcapabilities, or lack of experience and knowledge, unlessthey have been given supervision or instruction concerninguse of the appliance by a person responsible for theirsafety.Children should be supervised to ensure that they do notplay with the appliance.Cleaning and user maintenance must not be carried out bychildren without supervision.

WARNINGTo prevent electrical shocks or fire:▪ Do NOT rinse the unit.▪ Do NOT operate the unit with wet hands.▪ Do NOT place any objects containing water on the unit.

CAUTION▪ Do NOT place any objects or equipment on top of the

unit.▪ Do NOT sit, climb or stand on the unit.




▪ Units are marked with the following symbol:

This means that electrical and electronic products may NOT be mixed withunsorted household waste. Do NOT try to dismantle the system yourself: thedismantling of the system, treatment of the refrigerant, of oil and of other partsmust be done by an authorized installer and must comply with applicablelegislation.Units must be treated at a specialized treatment facility for reuse, recycling andrecovery. By ensuring this product is disposed of correctly, you will help toprevent potential negative consequences for the environment and humanhealth. For more information, contact your installer or local authority.

▪ Batteries are marked with the following symbol:

This means that the batteries may NOT be mixed with unsorted householdwaste. If a chemical symbol is printed beneath the symbol, this chemical symbolmeans that the battery contains a heavy metal above a certain concentration.Possible chemical symbols are: Pb: lead (>0.004%).Waste batteries must be treated at a specialized treatment facility for reuse. Byensuring waste batteries are disposed of correctly, you will help to preventpotential negative consequences for the environment and human health.

4.2 Instructions for safe operation

WARNINGDo NOT modify, disassemble, remove, reinstall or repairthe unit yourself as incorrect dismantling or installationmay cause an electric shock or fire. Contact your dealer.

CAUTIONIf this unit is equipped with an electrically powered safetymeasure, such as a CO2 refrigerant leak detector (fieldsupply), in order to be effective, the unit must beelectrically powered at all times after installation, exceptfor short service periods.

CAUTIONDo NOT insert fingers, rods or other objects into the airinlet or outlet. When the fan is rotating at high speed, itwill cause injury.



18FXSN50~112A2VEB


CAUTION▪ NEVER touch the internal parts of the controller.▪ Do NOT remove the front panel. Some parts inside are

dangerous to touch and appliance problems mayhappen. For checking and adjusting the internal parts,contact your dealer.

WARNINGThis unit contains electrical and hot parts.

WARNINGBefore operating the unit, be sure the installation has beencarried out correctly by an installer.

CAUTIONIt is not good for your health to expose your body to theair flow for a long time.

CAUTIONTo avoid oxygen deficiency, ventilate the room sufficientlyif equipment with burner is used together with the system.

CAUTIONDo NOT operate the system when using a roomfumigation-type insecticide. Chemicals could collect in theunit, and endanger the health of people who arehypersensitive to chemicals.

CAUTIONNEVER expose little children, plants or animals directly tothe airflow.

WARNINGDo NOT place objects below the indoor and/or outdoorunit that may get wet. Otherwise condensation on themain unit or refrigerant pipes, air filter dirt or drainblockage may cause dripping, and objects under the unitmay get dirty or damaged.




WARNINGDo NOT place a flammable spray bottle near the airconditioner and do NOT use sprays near the unit. Doing somay result in a fire.

Maintenance and service (see "10 Maintenance and service" [4 28])

WARNING: System contains refrigerant undervery high pressure.The system MUST be serviced by qualified persons only.

CAUTION: Pay attention to the fan!It is dangerous to inspect the unit while the fan is running.Be sure to turn off the main switch before executing anymaintenance task.

WARNINGNever replace a fuse with a fuse of a wrong ampere ratingsor other wires when a fuse blows out. Use of wire orcopper wire may cause the unit to break down or cause afire.

CAUTIONAfter a long use, check the unit stand and fitting fordamage. If damaged, the unit may fall and result in injury.

CAUTIONBefore accessing terminal devices, make sure to interruptall power supply.

DANGER: RISK OF ELECTROCUTIONTo clean the air conditioner or air filter, be sure to stopoperation and turn all power supplies off. Otherwise, anelectric shock and injury may result.

WARNINGBe careful with ladders when working in high places.

WARNINGDo NOT let the indoor unit get wet. Possible consequence:Electric shock or fire.



20FXSN50~112A2VEB


About the refrigerant (see "10.5 About the refrigerant" [4 30])

WARNING▪ Do NOT pierce or burn refrigerant cycle parts.▪ Do NOT use cleaning materials other than those

recommended by the manufacturer.▪ Be aware that the refrigerant inside the system is

odourless.

WARNINGThe refrigerant R744 (CO2) inside the unit is odourless,non-flammable and, in moderate concentrations, non-toxic, and normally does NOT leak.If the refrigerant leaks in the room, it may have negativeeffects on its occupants (asphyxiant in highconcentrations). Ventilate the room and contact the dealerwhere you purchased the unit (see "10.5.1 Aboutrefrigerant leak detection" [4 31]).Do NOT use the unit until a service person confirms thatthe part from which the refrigerant leaked has beenrepaired.

Troubleshooting (see "11 Troubleshooting" [4 33])

WARNINGStop operation and shut off the power if anythingunusual occurs (burning smells etc.).Leaving the unit running under such circumstances maycause breakage, electric shock or fire. Contact your dealer.

5 | About the system



5 About the systemNOTICEThe appliance shall be stored so as to prevent mechanical damage.

The indoor units can be used for heating/cooling applications.

WARNINGDo NOT modify, disassemble, remove, reinstall or repair the unit yourself as incorrectdismantling or installation may cause an electric shock or fire. Contact your dealer.

NOTICEDo NOT use the system for other purposes. In order to avoid any qualitydeterioration, do NOT use the unit for cooling precision instruments, food, plants,animals, or works of art.

NOTICEFor future modifications or expansions of your system:

A full overview of allowable combinations (for future system extensions) is availablein technical engineering data and should be consulted. Contact your installer toreceive more information and professional advice.

CAUTIONIf this unit is equipped with an electrically powered safety measure, such as a CO2refrigerant leak detector (field supply), in order to be effective, the unit must beelectrically powered at all times after installation, except for short service periods.

5.1 System layout

INFORMATIONThe following illustration is an example and might NOT match your system layout.

a

b b

c

a Outdoor unit

5 | About the system


22FXSN50~112A2VEB


b Indoor unitc User interface


5.2 Information requirements for fan coil units

Item Symbol Value UnitCooling capacity (sensible) Prated,c A kWCooling capacity (latent) Prated,c B kWHeating capacity Prated,h C kWTotal electric power input Pelec D kWSound power level (per speed setting, ifapplicable)

LWA E dB

Contact details:

DAIKIN INDUSTRIES CZECH REPUBLIC s.r.o. U Nové Hospody 1/1155, 301 00 PlzeňSkvrňany, Czech Republic

A B C D E

FXSN50 4.1 1.5 6.3 0.186 61

FXSN71 5.8 2.2 9.0 0.258 63

FXSN112 9.2 3.3 14.0 0.388 66

6 | User interface



6 User interfaceCAUTION▪ NEVER touch the internal parts of the controller.▪ Do NOT remove the front panel. Some parts inside are dangerous to touch and

appliance problems may happen. For checking and adjusting the internal parts,contact your dealer.

This operation manual offers a non-exhaustive overview of the main functions ofthe system.

For more information about the user interface, see the operation manual of theinstalled user interface.

7 | Before operation


24FXSN50~112A2VEB


7 Before operationWARNINGThis unit contains electrical parts.

WARNINGBefore operating the unit, be sure the installation has been carried out correctly byan installer.

CAUTIONIt is not good for your health to expose your body to the air flow for a long time.

CAUTIONTo avoid oxygen deficiency, ventilate the room sufficiently if equipment with burneris used together with the system.

CAUTIONDo NOT operate the system when using a room fumigation-type insecticide.Chemicals could collect in the unit, and endanger the health of people who arehypersensitive to chemicals.

This operation manual is for the following systems with standard control. Beforeinitiating operation, contact your dealer for the operation that corresponds to yoursystem type and mark. If your installation has a customised control system, askyour dealer for the operation that corresponds to your system.

8 | Operation



8 Operation

8.1 Operation range

Use the system in the following temperature and humidity ranges for safe andeffective operation.

Cooling and drying Heating

Outdoor unit –5~43°C DB –20~16°C WB

Indoor unit 14~24°C WB 15~27°C DB

Indoor humidity ≤80%(a) —(a) To avoid condensation and water dripping out of the unit. If the temperature or the

humidity is beyond these conditions, safety devices may be put in action and the airconditioner may not operate.

8.2 About operation modes

INFORMATIONDepending on the installed system, some operation modes will not be available.

▪ The air flow rate may adjust itself depending on the room temperature or the fanmay stop immediately. This is not a malfunction.

▪ If the main power supply is turned off during operation, operation will restartautomatically after the power turns back on again.

▪ Setpoint. Target temperature for the Cooling, Heating, and Auto operationmodes.

▪ Setback. A function that keeps the room temperature in a specific range whenthe system is turned off (by the user, the schedule function, or the OFF timer).

8.2.1 Basic operation modes

The indoor unit can operate in various operation modes.

Icon Operation mode

Cooling. In this mode, cooling will be activated as required by thesetpoint, or by Setback operation.

Heating. In this mode, heating will be activated as required bythe setpoint, or by Setback operation.

Fan only. In this mode, air circulates without heating or cooling.

Dry. In this mode, the air humidity will be lowered with aminimal temperature decrease.

The temperature and fan speed are controlled automatically andcannot be controlled by the controller.

Dry operation will not function if the room temperature is toolow.

8 | Operation


26FXSN50~112A2VEB


Icon Operation mode

Auto. In Auto mode, the indoor unit automatically switchesbetween heating and cooling mode, as required by the setpoint.

8.2.2 Special heating operation modes

Operation Description

Defrost To prevent a loss of heating capacity due to frostaccumulation in the outdoor unit, the system willautomatically switch to defrost operation.

During defrost operation, the indoor unit fan will stopoperation, and the following icon will appear on the homescreen:

In order to protect the system, cold air may come from theindoor unit when the defrost operation starts on the outdoorunit side.

The system will resume normal operation after approximately6 to 8 minutes.

Hot start During hot start, the indoor unit fan will stop operation, andthe following icon will appear on the home screen:

8.3 To operate the system

INFORMATIONFor setting of the operation mode or other settings, see the reference guide oroperation manual of the user interface.

9 | Energy saving and optimum operation



9 Energy saving and optimum operationCAUTIONNEVER expose little children, plants or animals directly to the airflow.

WARNINGDo NOT place objects below the indoor and/or outdoor unit that may get wet.Otherwise condensation on the unit or refrigerant pipes, air filter dirt or drainblockage may cause dripping, and objects under the unit may get dirty or damaged.

WARNINGDo NOT place a flammable spray bottle near the air conditioner and do NOT usesprays near the unit. Doing so may result in a fire.

Observe the following precautions to ensure the system operates properly.

▪ Prevent direct sunlight from entering a room during cooling operation by usingcurtains or blinds.

▪ Make sure the area is well ventilated. Do NOT block any ventilation openings.▪ Ventilate often. Extended use requires special attention to ventilation.▪ Keep doors and windows closed. If the doors and windows remain open, air will

flow out of your room causing a decrease in the cooling or heating effect.

▪ Be careful NOT to cool or heat too much. To save energy, keep the temperaturesetting at a moderate level.

▪ NEVER place objects near the air inlet or the air outlet of the unit. Doing so maycause a reduced heating/cooling effect or stop operation.

▪ Turn off the main power supply switch to the unit when the unit is NOT used forlonger periods of time. If the main power supply switch is on, the unit consumeselectricity. Before restarting the unit, turn on the main power supply switch 6hours before operation to ensure smooth running.

▪ When the display shows (time to clean the air filter), clean the filters (see"10.2.2 To clean the air filter" [4 29]).

▪ Condensation may form if the humidity is above 80% or if the drain outlet getsblocked.

▪ Adjust the room temperature properly for a comfortable environment. Avoidexcessive heating or cooling. Notice that it may take some time for the roomtemperature to reach the set temperature. Consider using the timer settingoptions.

▪ Adjust the air flow direction to avoid cool air from gathering on the floor or warmair against the ceiling. (Up during cooling or dry operation to the ceiling anddown during heating operation.)

▪ Avoid direct air flow to room inhabitants.▪ Adjust the air outlet properly and avoid direct air flow to room inhabitants.

10 | Maintenance and service


28FXSN50~112A2VEB


10 Maintenance and service

10.1 Precautions for maintenance and service

WARNING: System contains refrigerant under very highpressure.The system MUST be serviced by qualified persons only.

NOTICEMaintenance MUST be done by an authorized installer or service agent.

We recommend performing maintenance at least once a year. However, applicablelegislation might require shorter maintenance intervals.

CAUTION: Pay attention to the fan!It is dangerous to inspect the unit while the fan is running.

Be sure to turn off the main switch before executing any maintenance task.


NOTICENever inspect or service the unit by yourself. Ask a qualified service person toperform this work. However, as end user, you may clean the air filter, suction grille,air outlet and outside panels.

WARNINGNever replace a fuse with a fuse of a wrong ampere ratings or other wires when afuse blows out. Use of wire or copper wire may cause the unit to break down orcause a fire.

CAUTIONAfter a long use, check the unit stand and fitting for damage. If damaged, the unitmay fall and result in injury.

CAUTIONBefore accessing terminal devices, make sure to interrupt all power supply.

DANGER: RISK OF ELECTROCUTIONTo clean the air conditioner or air filter, be sure to stop operation and turn all powersupplies off. Otherwise, an electric shock and injury may result.

WARNINGBe careful with ladders when working in high places.




10.2 Cleaning the air filter and air outlet

10.2.1 To clean the air outlet

WARNINGDo NOT let the indoor unit get wet. Possible consequence: Electric shock or fire.

NOTICE▪ Do NOT use gasoline, benzene, thinner polishing powder or liquid insecticide.

Possible consequence: Discoloration and deformation.

▪ Do NOT use water or air of 50°C or higher. Possible consequence: Discolorationand deformation.

Clean with a soft cloth. If it is difficult to remove stains, use water or a neutraldetergent.

10.2.2 To clean the air filter

When to clean the air filter:▪ Rule of thumb: Clean every 6 months. If the air in the room is extremely

contaminated, increase the cleaning frequency.

▪ Depending on the settings, the user interface can display the TIME TO CLEAN AIRFILTER notification. Clean the air filter when the notification is displayed.

▪ If the dirt becomes impossible to clean, change the air filter (= optionalequipment).

How to clean the air filter:1 Remove the air filters by pulling their cloth upward (in case of rear suction) or

backward (in case of bottom suction).

rear suction bottom suction

2 Clean the air filter. Use a vacuum cleaner or wash with water. If the air filter isvery dirty, use a soft brush and neutral detergent.

3 Dry the air filter in the shadow.4 Re-attach the air filter. Align the 2 hanger brackets and push the 2 clips in

their place and pull the cloth if necessary.



30FXSN50~112A2VEB


rear suction bottom suction

5 Confirm that 4 hangers are fixed.6 In case of bottom suction, close the air inlet grille.7 Turn ON the power.8 To remove warning screens, see the reference guide of the user interface.

10.3 Maintenance before a long stop period

E.g., at the end of the season.

▪ Let the indoor units run in fan only operation for about half a day in order to drythe interior of the units.

▪ Turn off the power. The user interface display disappears. When the main poweris turned on, the air conditioner will use some power, even if it is not operating.

▪ Clean the air filter and the casing of the indoor unit (see "10.2 Cleaning the airfilter and air outlet" [4 29]). Make sure to install cleaned air filters back in thesame position.

▪ Remove the batteries from the user interface (if applicable).

10.4 Maintenance after a long stop period

E.g., at the beginning of the season.

▪ Check and remove everything that might be blocking inlet and outlet vents ofindoor units and outdoor units.

▪ Check if the earth is connected properly.▪ Check if there is somewhere a broken wire. Contact your dealer in case of

problems.

▪ Clean the air filter and the casing of the indoor unit (see "10.2 Cleaning the airfilter and air outlet" [4 29]). Make sure to install cleaned air filters back in thesame position.

▪ Turn on the power at least 6 hours before operating the unit in order to ensuresmoother operation. As soon as the power is turned on, the user interfacedisplay appears.

▪ Insert batteries in the user interface (if applicable).

10.5 About the refrigerant

This product contains refrigerant gases.




Refrigerant type: R744 (CO2)

WARNING▪ Do NOT pierce or burn refrigerant cycle parts.▪ Do NOT use cleaning materials other than those recommended by the

manufacturer.

▪ Be aware that the refrigerant inside the system is odourless.

WARNINGThe refrigerant R744 (CO2) inside the unit is odourless, non-flammable and, inmoderate concentrations, non-toxic, and normally does NOT leak.

If the refrigerant leaks in the room, it may have negative effects on its occupants(asphyxiant in high concentrations). Ventilate the room and contact the dealer whereyou purchased the unit (see "10.5.1 About refrigerant leak detection" [4 31]).

Do NOT use the unit until a service person confirms that the part from which therefrigerant leaked has been repaired.

10.5.1 About refrigerant leak detection

In order to detect refrigerant leaks, a CO2 refrigerant leak detector (field supply)MUST be installed. The CO2 refrigerant leak detector may require annual tests. Formore details, see the documentation of the installed device.

In case a CO2 refrigerant leak is detected

▪ the fan of the indoor unit is stopped to prevent the refrigerant from beingspread,

▪ the user interface displays error code A0 or U9 ( for the Madoka; to displayerror codes, refer to the reference guide of the Madoka),

▪ a warning sound will come from the user interface ( only for Madoka with buzzer,see option list) or from another safety alarm in combination with a CO2refrigerant leak detector (field supply).

Actions required by the user1 Ventilate the room and immediately contact the dealer where you purchased

the unit. Do NOT use the unit before the fault is fixed.

Actions required by the installer or the service person

INFORMATIONDuring detection of the refrigerant leakage, the contact between terminals T1 and T2disconnects. During normal operation, the contact between terminals T1 and T2 isclosed (acting as a short circuit).

1 If field supplied stop-valves are NOT installed: Close the stop valves of the gasand liquid pipe on the outdoor unit.

2 If field supplied shut-off valves are installed: If the refrigerant leak to the roomhas stopped, you can use the air conditioner for other rooms where therefrigerant leak did NOT occur.

3 Locate and repair the cause of the refrigerant leak. If necessary, replace theindoor unit.

4 Refill the refrigerant if needed.5 Perform manual power reset and resume operation.



32FXSN50~112A2VEB


NOTICEAfter the refrigerant leakage is detected, the unit will send a signal at regularintervals to confirm if the CO2 concentration is at a safe level. Even when the CO2concentration is at a safe level, do NOT resume operation before the fault is fixedand the refrigerant is refilled.

11 | Troubleshooting



11 TroubleshootingIf one of the following malfunctions occur, take the measures shown below andcontact your dealer.

WARNINGStop operation and shut off the power if anything unusual occurs (burning smellsetc.).

Leaving the unit running under such circumstances may cause breakage, electricshock or fire. Contact your dealer.

The system MUST be repaired by a qualified service person.

Malfunction Measure

If a safety device such as a fuse, a breaker or anearth leakage breaker frequently actuates or theON/OFF switch does NOT function properly.

Turn OFF all main power supplyswitches to the unit.

If water leaks from the unit. Stop operation.

The operation switch does NOT functionproperly.

Turn OFF the power supply.

If the user interface displays or an error code. Notify your installer and reportthe error code. To display errorcodes, see the reference guideof the user interface.

The user interface displays error code A0 or U9(or ), the fan stops and you can hear awarning sound from the user interface (in caseof Madoka) or from another safety alarm incombination with a gas detection device (ifinstalled).

A refrigerant leak may bedetected (see "10.5.1 Aboutrefrigerant leakdetection" [4 31]).

If the system does NOT operate properly except for the above mentioned casesand none of the above mentioned malfunctions is evident, investigate the systemin accordance with the following procedures.

If after checking all above items, it is impossible to fix the problem yourself, contactyour installer and state the symptoms, the complete model name of the unit (withmanufacturing number if possible) and the installation date (possibly listed on thewarranty card).

Malfunction Measure

If the system does notoperate at all.

▪ Check if there is no power failure. Wait untilpower is restored. If a power failure occurs duringoperation, the system automatically restartsimmediately after power is restored.

▪ Check if no fuse has blown or breaker is activated.Change the fuse or reset the breaker if necessary.

The system stopsimmediately after startingoperation.

▪ Check if air inlet or outlet of outdoor or indoorunit is not blocked by obstacles. Remove anyobstacles and make sure the air can flow freely.

▪ Check if the air filter is clogged (see "10.2.2 Toclean the air filter" [4 29]).



34FXSN50~112A2VEB


Malfunction Measure

The system operates butcooling or heating isinsufficient.

▪ Check if air inlet or outlet of outdoor or indoorunit is not blocked by obstacles. Remove anyobstacles and make sure the air can flow freely.


▪ Check the temperature setting. Refer to themanual of the user interface.

▪ Check if the fan speed setting is set to low speed.Refer to the manual of the user interface.

▪ Check if the air flow angle is proper. Refer to themanual of the user interface.

▪ Check for open doors or windows. Close doors andwindows to prevent wind from coming in.

▪ Check if direct sunlight enters the room. Usecurtains or blinds.

▪ Check if there are too many occupants in the roomduring cooling operation. Check if the heat sourceof the room is excessive.

▪ If the heat source of the room is excessive (whencooling). Cooling effect decreases if heat gain ofthe room is too large.

Operation stops suddenly.

(user interface operationlamp or display blinks)


▪ Check if air inlet or outlet of outdoor or indoorunit is not blocked by obstacles. Remove anyobstacles, turn the breaker OFF and back ON. Ifthe lamp or display still blinks, contact your dealer.

An abnormal functionhappens during operation.

▪ The air conditioner may malfunction because oflightning or radio waves. Turn the breaker OFF andback ON.

11.1 Symptoms that are NOT system malfunctions

The following symptoms are NOT system malfunctions:

11.1.1 Symptom: The system does not operate

▪ The air conditioner does not start immediately after the ON/OFF button on theuser interface is pressed. If the operation lamp lights, the air conditioner is innormal condition. It does not restart immediately because one of its safetydevices actuates to prevent the air conditioner from being overloaded. The airconditioner will turn on again automatically after 3 minutes.

▪ The air conditioner does not start immediately after the power supply is turnedon. Wait 1 minute until the microcomputer is prepared for operation.




▪ The air conditioner does not restart immediately when the temperature settingbutton is returned to its former position after pushing. It does not restartimmediately because one of its safety devices actuates to prevent the airconditioner from being overloaded. The air conditioner will turn on againautomatically after 3 minutes.

▪ The outdoor unit has stopped air conditioning (refrigeration continues). This isbecause the room temperature has reached the set temperature. The unitswitches to fan operation. The actual operation is different from the userinterface setting.

▪ The fan speed is different from the setting. Pressing the fan speed control buttondoes not change the fan speed. When the room temperature reaches the settemperature in heating mode or the unit’s maximum capacity is reached, theoutdoor unit will stop air conditioning (refrigeration continues) and the indoorunit will operate in fan only mode (low fan speed). This is to prevent cool air frombeing blown directly onto anyone present in the room.

11.1.2 Symptom: Dust comes out of the unit

When the unit is used for the first time in a long time. This is because dust hasgotten into the unit.

11.1.3 Symptom: The units can give off odours

The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit itagain.

12 | Disposal


36FXSN50~112A2VEB


12 DisposalNOTICEDo NOT try to dismantle the system yourself: dismantling of the system, treatment ofthe refrigerant, oil and other parts MUST comply with applicable legislation. UnitsMUST be treated at a specialised treatment facility for reuse, recycling and recovery.

For the installer



For t

he in

stal

ler

For the installer

13 | About the box


38FXSN50~112A2VEB


13 About the box

13.1 Overview: About the box

This chapter describes what you have to do after the box with the indoor unit isdelivered on-site.

Keep the following in mind:

▪ At delivery, the unit MUST be checked for damage. Any damage MUST bereported immediately to the claims agent of the carrier.

▪ Bring the packed unit as close as possible to its final installation position toprevent damage during transport.

▪ Prepare the path along which you want to bring the unit inside in advance.

13.2 Indoor unit

13.2.1 To unpack and handle the unit

Use a sling of soft material or protective plates together with a rope when liftingthe unit. This to avoid damage or scratches to the unit.

1 Lift the unit by holding on to the hanger brackets without exerting anypressure on other parts, especially on refrigerant piping, drain piping andother resin parts.

1 2

13.2.2 To remove the accessories from the indoor unit

3×40×8×1× 1× 1×

1×

1×

2× 1×

dcba e f g

h i j k4×

a Installation and operation manualb General safety precautions

13 | About the box



c Washers for hanger bracketd Screws for duct flangese Metal clampf Sealing pads: Large (drain pipe), medium 1 (gas pipe), medium 2 (liquid pipe)g Drain hoseh Long sealingi Insulation piece: Small (liquid pipe)j Insulation piece: Large (gas pipe)k Tie wraps

14 | About the units and options


40FXSN50~112A2VEB


14 About the units and optionsIn this chapter

14.1 Identification........................................................................................................................................................................... 4014.1.1 Identification label: Indoor unit ............................................................................................................................. 40

14.2 About the indoor unit ............................................................................................................................................................. 4014.3 System layout.......................................................................................................................................................................... 4014.4 Combining units and options.................................................................................................................................................. 41

14.4.1 Possible options for the indoor unit ...................................................................................................................... 41

14.1 Identification

NOTICEWhen installing or servicing several units at the same time, make sure NOT to switchthe service panels between different models.

14.1.1 Identification label: Indoor unit

Location

14.2 About the indoor unit

Use the system in the following temperature and humidity ranges for safe andeffective operation.

Cooling and drying Heating

Outdoor unit –5~43°C DB –20~16°C WB

Indoor unit 14~24°C WB 15~27°C DB

Indoor humidity ≤80%(a) —(a) To avoid condensation and water dripping out of the unit. If the temperature or the

humidity is beyond these conditions, safety devices may be put in action and the airconditioner may not operate.

14.3 System layout

INFORMATIONThe following illustration is an example and might NOT match your system layout.

14 | About the units and options



a

b b

c

a Outdoor unitb Indoor unitc User interface


14.4 Combining units and options

INFORMATIONCertain options might not be available in your country.

14.4.1 Possible options for the indoor unit

Make sure you have the following mandatory options:

▪ User interface: Wired or wireless (refer to catalogues and technical literature toselect a suitable user interface)

INFORMATIONMadoka with buzzer is a recommended option. In case you use another userinterface, an additional safety alarm in combination with a gas detection device (fieldsupply) may be required; see "15.1.2 Additional installation site requirements for CO₂refrigerant" [4 45].

15 | Unit installation


42FXSN50~112A2VEB


15 Unit installationWARNINGInstallation shall be done by an installer, the choice of materials and installation shallcomply with the applicable legislation. In Europe, EN378 is the applicable standard.

WARNING▪ Make sure to install all necessary countermeasures in case of refrigerant leakage

according to standard EN378 (see "15.1.2 Additional installation siterequirements for CO₂ refrigerant" [4 45]).

▪ Make sure to install a CO2 leak detector (field supply) and enable the function forrefrigerant leak detection (see "19.1 Field setting" [4 70]).

In this chapter15.1 Preparing the installation site ................................................................................................................................................ 42

15.1.1 Installation site requirements of the indoor unit .................................................................................................. 4215.1.2 Additional installation site requirements for CO₂ refrigerant............................................................................... 45

15.2 Mounting the indoor unit....................................................................................................................................................... 5015.2.1 Guidelines when installing the indoor unit............................................................................................................ 5015.2.2 Guidelines when installing the ducting.................................................................................................................. 5215.2.3 Guidelines when installing the drain piping .......................................................................................................... 52

15.3 Relocation ............................................................................................................................................................................... 56

15.1 Preparing the installation site

Do NOT install the unit in places often used as work place. In case of constructionworks (e.g. grinding works) where a lot of dust is created, the unit MUST becovered.

Choose an installation location with sufficient space for carrying the unit in and outof the site.

15.1.1 Installation site requirements of the indoor unit

INFORMATIONAlso read the following requirements:

▪ General installation site requirements. See the "General safety precautions"chapter.

▪ Refrigerant piping requirements (length, height difference). See further in this"Preparation" chapter.

INFORMATIONThe sound pressure level is less than 70 dBA.

CAUTIONAppliance not accessible to the general public, install it in a secured area, protectedfrom easy access.

This unit, both indoor and outdoor, is suitable for installation in a commercial andlight industrial environment.

Do NOT install the unit in the following places:




▪ In places where a mineral oil mist, spray or vapour may be present in theatmosphere. Plastic parts may deteriorate and fall off or cause water leakage.

It is NOT recommended to install the unit in the following places because it mayshorten the life of the unit:

▪ Where the voltage fluctuates a lot▪ In vehicles or vessels▪ Where acidic or alkaline vapour is present

NOTICEThis is a class A product. In a domestic environment this product may cause radiointerference in which case the user may be required to take adequate measures.

NOTICEThe equipment described in this manual may cause electronic noise generated fromradio-frequency energy. The equipment complies to specifications that are designedto provide reasonable protection against such interference. However, there is noguarantee that interference will not occur in a particular installation.

It is therefore recommended to install the equipment and electric wires in such away that they keep a proper distance from stereo equipment, personal computers,etc.

▪ In places with weak reception, keep distances of 3 m or more to avoidelectromagnetic disturbance of other equipment and use conduit tubes forpower and transmission lines.

▪ Fluorescent lights. When installing a wireless user interface in a room withfluorescent lights, mind the following to avoid interference:

- Install the wireless user interface as close as possible to the indoor unit.- Install the indoor unit as far as possible from the fluorescent lights.

▪ Take care that in the event of a water leak, water cannot cause any damage tothe installation space and surroundings.

▪ Choose a location where the operation noise or the hot/cold air discharged fromthe unit will not disturb anyone.

WARNINGDo NOT place objects below the indoor and/or outdoor unit that may get wet.Otherwise condensation on the main unit or refrigerant pipes, air filter dirt or drainblockage may cause dripping, and objects under the unit may get dirty or damaged.

▪ Air flow. Make sure nothing blocks the air flow.▪ Drainage. Make sure condensation water can be evacuated properly.▪ Ceiling insulation. When conditions in the ceiling exceed 30°C and a relative

humidity of 80%, or when fresh air is inducted into the ceiling, then additionalinsulation is required (minimum 10 mm thickness, polyethylene foam).

▪ Protective guards. Make sure to install protective guards (field supply) on thesuction and discharge side to prevent somebody from touching the fan blades orheat exchanger.

▪ Spacing. Mind the following requirements:



44FXSN50~112A2VEB


≥500

c

A

(mm)ba

A Minimum distance to the floor2.7 m to avoid accidental touching2.5 m in case the fan is covered (e.g. false ceiling, grille, …)

a Ceilingb Floor surfacec Maintenance space

Service space and ceiling opening size

Make sure ceiling opening is big enough to ensure a sufficient clearance formaintenance and service.

800

800

(mm)

ab:

≥50

0

a

A B

C

≥500

A Side view: refrigerant piping, drain piping, control boxB Side view: air inletC Top viewa Ceiling opening

Class 50: 700 mmClass 71: 1000 mmClass 112: 1400 mm

b Service space

Installation optionsA

cab ≥1100

(mm)

B

ab ≥1100

(mm)

c degf




125

c(mm)b 800

160

(160

~300

)

h ≥460

g

a

C

245

f

A Standard rear suctionB Installation with rear canvas duct and duct service openingC Installation with bottom canvas duct and air inlet grilla Ceiling surfaceb Ceiling openingc Air filter removal route for air filter maintenanced Air inlet filtere Duct service openingf Interchangeable plateg Canvas connection for air inlet panel (field supply)h Air inlet panel (field supply) opening

INFORMATIONSome options may require additional service space. Refer to the installation manualof the used option before installation.

15.1.2 Additional installation site requirements for CO₂ refrigerant

Refrigerant basic characteristics

Refrigerant R744

RCL (refrigerant concentration limit) 0.072 kg/m3

QLMV (quantity limit with minimum ventilation) 0.074 kg/m3

QLAV (quantity limit with additional ventilation) 0.18 kg/m3

Toxicity limit 0.1 kg/m3

Safety class A1

Allowable refrigerant charge

The calculation of the allowable refrigerant charge depends on the combination ofthe "access category" and the "location classification" as described in the followingtable.

INFORMATIONWhere the possibility exists of more than one access category, the more stringentrequirements apply. If occupied spaces are isolated, e.g. by sealed partitions, floorsand ceilings, the requirements of the individual access category apply.



46FXSN50~112A2VEB


Access category Location classificationI II III IV

General Toxicity limit × Room volumeor

"Appropriate measures" [4 47]

No chargerestriction

The charge shallbe assessedaccording to

location I, II or III,depending on the

location of theventilatedenclosure

Supervised Upper floorswithoutemergency exits

Toxicity limit × Roomvolume

or"Appropriate

measures" [4 47]

No chargerestriction

Below groundfloor level

Other No charge restriction

Authorized Upper floorswithoutemergency exits

Toxicity limit × Roomvolume

or"Appropriate

measures" [4 47]Below groundfloor level

Other No charge restriction

15‒1 Description of access categories

Access category Description Examples

General access Rooms, parts of buildings, buildingswhere:

▪ sleeping facilities are provided;▪ people are restricted in their

movements;

▪ an uncontrolled number of people arepresent;

▪ any person has access without beingpersonally acquainted with thenecessary safety precautions.

Hospitals, courts or prisons, theatres,supermarkets, schools, lecture halls, publictransport terminals, hotels, restaurants.

Supervised access Rooms, parts of buildings, buildingswhere only a limited number of peoplemay be assembled, some beingnecessarily acquainted with the generalsafety precautions of the location.

Business or professional offices, laboratories,places for general manufacturing and wherepeople work.

Authorized access Rooms, parts of buildings, buildingswhere only authorized persons haveaccess, who are acquainted withgeneral and special safety precautionsof the location and wheremanufacturing, processing or storage ofmaterial or products take place.

Manufacturing facilities, e.g. for chemicals,food, beverage, ice, ice cream, refineries,cold stores, dairies, abattoirs, non-publicareas in supermarkets.

15‒2 Description of location classification

Location classification Description

Class I Mechanical equipmentlocated within the occupiedspace

If the refrigerating system or refrigerant-containing parts are locatedin the occupied space, the system is considered to be of class I, unlessthe system complies with the requirements of class II.




Location classification Description

Class II Compressors in machineryroom or open air

If all compressors and pressure vessels are either located in amachinery room or in the open air, the requirements for a class IIlocation shall apply, unless the system complies with therequirements of class III. Coils and pipework including valves may belocated in an occupied space.

Class III Machinery room or open air If all refrigerant-containing parts are located in a machinery room orin the open air, the requirements for a class III location shall apply.The machinery room shall fulfil the requirements of EN 378-3.

Class IV Ventilated enclosure If all refrigerant-containing parts are located in a ventilatedenclosure, the requirements for a class IV location shall apply. Theventilated enclosure shall fulfil the requirements of EN 378-2 and EN378-3.

Appropriate measures

INFORMATIONAppropriate measures are field supply. Choose and install all required appropriatemeasures in accordance with EN 378-3:2016.

▪ (natural or mechanical) ventilation▪ safety shut-off valves▪ safety alarm, in combination with a CO2 refrigerant leak detector (a safety alarm

alone is NOT considered an appropriate measure where occupants are restrictedin their movements)

▪ CO2 refrigerant leak detector

WARNINGInstall the unit only in locations where the doors of the occupied space are not tightfitting.

WARNINGWhen using safety shut-off valves, make sure to install measures such as a bypassingpiping with a pressure relief valve (from liquid pipe to gas pipe). When the safetyshut-off valves close and no measures are installed, increased pressure may damagethe liquid piping.

Example: Install the bypass piping (e) with a pressure relief valve (g) leading fromthe liquid piping between indoor unit and the shut off valve (c2) to the gas pipingbetween outdoor unit and the shut off valve (d1).

a

bf

f

h

gb c1c1

c2c2

d1d1

d2d2

eeee

Ø12.7 mm Ø9.52 mm

15‒1 Installation layout example



48FXSN50~112A2VEB


a Outdoor unitb Stop valve on the outdoor unit

c1 Liquid piping between outdoor unit and the shut off valvec2 Liquid piping between indoor unit and the shut off valved1 Gas piping between outdoor unit and the shut off valved2 Gas piping between indoor unit and the shut off valve

e Bypassing pipingf Safety shut off valveg Pressure relief valveh Indoor unit

To determine the minimum number of appropriate measures

For occupancies other than on the lowest underground floor of the building

If the total refrigerant charge (kg)divided by the room volume(a) (m3) is…

…the number of appropriate measuresmust be at least…

QLMV and QLAV 2(a) For occupied spaces with a floor area exceeding 250 m2, use 250 m2 as the floor area for

determination of the room volume (Example: even if the room area is 300 m2 and theroom height is 2.5 m, calculate the room volume as 250 m2 × 2.5 m = 625 m3)

Example: Total refrigerant charge in the system is 45 kg and room volume is300 m3. 45/300 = 0.15, which is >QLMV(0.074) and QLMV and QLAV Value CANNOT be exceeded!(a) For occupied spaces with a floor area exceeding 250 m2, use 250 m2 as the floor area for

determination of the room volume (Example: even if the room area is 300 m2 and theroom height is 2.5 m, calculate the room volume as 250 m2 × 2.5 m = 625 m3)




Example: Total refrigerant change in the system is 45 kg and room volume is300 m3. 45/300 = 0.15, which is >RCL(0.072) and



50FXSN50~112A2VEB


▪ Include the space above a false ceiling or partition in the volume calculationunless the false ceiling is airtight.

▪ Where an indoor unit, or any related refrigerant-containing pipework, is locatedin a space where the total charge exceeds the allowable charge, make specialprovisions to ensure at least an equivalent level of safety

co₂ conveni-pack: indoor unit · 2021. 1. 7. · excessive refrigerant concentrations in a closed...

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