Daikin FXZA15A2VEB, FXZA20A2VEB, FXZA25A2VEB, FXZA32A2VEB, FXZA40A2VEB Installer reference guide

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Installer and user reference guide

VRV system air conditioner

FXZA15A2VEB FXZA20A2VEB FXZA25A2VEB FXZA32A2VEB FXZA40A2VEB FXZA50A2VEB

Table of contents

1 About the documentation 4

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

2 General safety precautions 5

2.1 About the documentation .............................................................................................................................................. 5

2.1.1 Meaning of warnings and symbols ................................................................................................................ 5

2.2 For the installer............................................................................................................................................................... 6

2.2.1 General ........................................................................................................................................................... 6

2.2.2 Installation site ............................................................................................................................................... 7

2.2.3 Refrigerant — in case of R410A or R32.......................................................................................................... 7

2.2.4 Electrical ......................................................................................................................................................... 9

3 Specific installer safety instructions 12

3.1 Instructions for equipment using R32 refrigerant ......................................................................................................... 14

3.1.1 Installation space requirements..................................................................................................................... 15

For the user 16

4 User safety instructions 17

4.1 General............................................................................................................................................................................ 17

4.2 Instructions for safe operation ....................................................................................................................................... 18

5 About the system 23

5.1 System layout.................................................................................................................................................................. 23

5.2 Information requirements for fan coil units................................................................................................................... 24

6 User interface 25

7 Before operation 26

8 Operation 27

8.1 Operation range.............................................................................................................................................................. 27

8.2 About operation modes.................................................................................................................................................. 27

8.2.1 Basic operation modes ................................................................................................................................... 27

8.2.2 Special heating operation modes................................................................................................................... 28

8.2.3 Adjusting the airflow direction....................................................................................................................... 28

8.3 To operate the system.................................................................................................................................................... 29

9 Energy saving and optimum operation 30

10 Maintenance and service 31

10.1 Precautions for maintenance and service ...................................................................................................................... 31

10.2 Cleaning the air filter, suction grille, air outlet and outside panels............................................................................... 32

10.2.1 To clean the air filter ...................................................................................................................................... 32

10.2.2 To clean the suction grille .............................................................................................................................. 33

10.2.3 To clean the air outlet and outside panels .................................................................................................... 34

10.3 Maintenance before a long stop period......................................................................................................................... 35

10.4 Maintenance after a long stop period............................................................................................................................ 35

10.5 About the refrigerant...................................................................................................................................................... 35

10.5.1 About the refrigerant leakage sensor ............................................................................................................ 36

11 Troubleshooting 38

11.1 Symptoms that are NOT system malfunctions............................................................................................................... 39

11.1.1 Symptom: The system does not operate....................................................................................................... 39

11.1.2 Symptom: The fan speed does not correspond to the setting...................................................................... 39

11.1.3 Symptom: The fan direction does not correspond to the setting................................................................. 39

11.1.4 Symptom: White mist comes out of a unit (Indoor unit) .............................................................................. 40

11.1.5 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)........................................................ 40

11.1.6 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes.......... 40

11.1.7 Symptom: Noise of air conditioners (Indoor unit)......................................................................................... 40

11.1.8 Symptom: Noise of air conditioners (Indoor unit, outdoor unit) .................................................................. 40

11.1.9 Symptom: Dust comes out of the unit........................................................................................................... 40

11.1.10 Symptom: The units can give off odours ....................................................................................................... 40

Installer and user reference guide

12 Relocation 41

13 Disposal 42

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

Table of contents

For the installer 43

14 About the box 44

14.1 Overview: About the box ................................................................................................................................................ 44

14.2 Indoor unit ...................................................................................................................................................................... 44

14.2.1 To unpack and handle the unit ...................................................................................................................... 44

14.2.2 To remove the accessories from the indoor unit .......................................................................................... 45

15 About the units and options 46

15.1 Identification ................................................................................................................................................................... 46

15.1.1 Identification label: Indoor unit ..................................................................................................................... 46

15.2 About the indoor unit ..................................................................................................................................................... 46

15.3 System layout .................................................................................................................................................................. 46

15.4 Combining units and options .......................................................................................................................................... 47

15.4.1 Possible options for the indoor unit............................................................................................................... 47

16 Unit installation 49

16.1 Preparing the installation site......................................................................................................................................... 49

16.1.1 Installation site requirements of the indoor unit .......................................................................................... 49

16.2 Mounting the indoor unit ............................................................................................................................................... 51

16.2.1 Guidelines when installing the indoor unit.................................................................................................... 51

16.2.2 Guidelines when installing the drain piping................................................................................................... 54

17 Piping installation 57

17.1 Preparing refrigerant piping ........................................................................................................................................... 57

17.1.1 Refrigerant piping requirements.................................................................................................................... 57

17.1.2 Refrigerant piping insulation.......................................................................................................................... 58

17.2 Connecting the refrigerant piping .................................................................................................................................. 58

17.2.1 About connecting the refrigerant piping ....................................................................................................... 58

17.2.2 Precautions when connecting the refrigerant piping.................................................................................... 59

17.2.3 Guidelines when connecting the refrigerant piping...................................................................................... 59

17.2.4 Pipe bending guidelines ................................................................................................................................. 60

17.2.5 To flare the pipe end ...................................................................................................................................... 60

17.2.6 To connect the refrigerant piping to the indoor unit .................................................................................... 61

18 Electrical installation 62

18.1 About connecting the electrical wiring .......................................................................................................................... 62

18.1.1 Precautions when connecting the electrical wiring....................................................................................... 62

18.1.2 Guidelines when connecting the electrical wiring......................................................................................... 63

18.1.3 Specifications of standard wiring components.............................................................................................. 64

18.2 To connect the electrical wiring to the indoor unit ....................................................................................................... 65

19 Commissioning 67

19.1 Overview: Commissioning .............................................................................................................................................. 67

19.2 Precautions when commissioning .................................................................................................................................. 67

19.3 Checklist before commissioning ..................................................................................................................................... 68

19.4 To perform a test run...................................................................................................................................................... 68

20 Configuration 69

20.1 Field setting ..................................................................................................................................................................... 69

21 Hand-over to the user 72

22 Troubleshooting 73

22.1 Solving problems based on error codes ......................................................................................................................... 73

22.1.1 Error codes: Overview.................................................................................................................................... 73

23 Disposal 75

24 Technical data 76

24.1 Wiring diagram................................................................................................................................................................ 76

24.1.1 Unified wiring diagram legend....................................................................................................................... 76

25 Glossary 79

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

1 | About the documentation

1 About the documentation

1.1 About this document

Target audience

Authorised installers + end users

Documentation set

INFORMATION

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

WARNING

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

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 regional Daikin website or via your dealer.

The original documentation is written in English. All other languages are translations.

Technical engineering data

Installer and user reference guide

▪ 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).

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

2 General safety precautions

2.1 About the documentation

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

translations.

▪ The precautions described in this document cover very important topics, follow

them carefully.

▪ The installation of the system, and all activities described in the installation

manual and in the installer reference guide MUST be performed by an authorised installer.

2.1.1 Meaning of warnings and symbols

DANGER

Indicates a situation that results in death or serious injury.

2 | General safety precautions

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.

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.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

NOTICE

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

INFORMATION

Indicates useful tips or additional information.

Symbols used on the unit:

Installer and user reference guide

2 | General safety precautions

Symbols used in the documentation:

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.

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 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).

Installer and user reference guide

CAUTION

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

WARNING

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

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

2 | General safety precautions

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

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.

NOTICE

Works executed on the outdoor unit are best done under dry weather conditions to avoid water ingress.

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,…

2.2.2 Installation site

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.

▪ 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.

2.2.3 Refrigerant — in case of R410A or R32

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

▪ In places where corrosive gas (example: sulphurous acid gas) is produced.

Corrosion of copper pipes or soldered parts may cause the refrigerant to leak.

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

Installer and user reference guide

2 | General safety precautions

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.

WARNING

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

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.

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: Selfcombustion 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

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

NOTICE

After all the piping has been connected, make sure there is no gas leak. Use nitrogen to 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 treated

according to the applicable legislation.

Installer and user reference guide

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.

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

refrigerant and necessary amount.

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

2 | General safety precautions

▪ 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

Charge with the cylinder upright.

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

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.

2.2.4 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.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

2 | General safety precautions

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.

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.

Installer and user reference guide

Install power cables at least 1 m away from televisions or radios to prevent interference. Depending on the radio waves, a distance of 1 m may not be sufficient.

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

2 | General safety precautions

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.

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.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

3 | Specific installer safety instructions

3 Specific installer safety instructions

Always observe the following safety instructions and regulations.

General

WARNING

Installation site (see

"16.1Preparing the installation site"[449]

WARNING

The appliance shall be stored in a room without continuously operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater).

CAUTION

Appliance not accessible to the general public, install it in a secured area, protected from easy access.

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

Refrigerant piping installation (see

CAUTION

▪ Do NOT use mineral oil on flared part. ▪ Do NOT reuse piping from previous installations. ▪ NEVER install a drier to this R32 unit to guarantee its lifetime. The drying material

may dissolve and damage the system.

"17Piping installation"[457]

)

Installer and user reference guide

CAUTION

▪ Incomplete flaring may cause refrigerant gas leakage. ▪ Do NOT re-use flares. Use new flares to prevent refrigerant gas leakage. ▪ Use flare nuts that are included with the unit. Using different flare nuts may

cause refrigerant gas leakage.

CAUTION

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

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

3 | Specific installer safety instructions

Electrical installation (see

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

▪ 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.

"18Electrical installation"[462]

)

WARNING

ALWAYS use multicore cable for power supply cables.

WARNING

Use an all-pole disconnection type breaker with at least 3mm between the contact point gaps that provide full disconnection under overvoltage category III.

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

▪ Each indoor unit has to be connected to a separate user interface. Only a safety

system compatible remote controller can be used as the user interface. See technical data sheet for remote controller compatibility (e.g. BRC1H52/82*).

▪ The user interface has to be put in the same room as the indoor unit. For details,

please refer to the installation and operation manual of the user interface.

Commisioning (see

WARNING

If the panels on the indoor units are not installed yet, make sure to power OFF the system after finishing the test run. To do so, turn OFF operation via the user interface. Do NOT stop operation by turning OFF the circuit breakers.

"19Commissioning"[467]

)

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

3 | Specific installer safety instructions

3.1 Instructions for equipment using R32 refrigerant

WARNING: MILDLY FLAMMABLE MATERIAL

The refrigerant inside this unit is mildly flammable.

WARNING

▪ Do NOT pierce or burn. ▪ 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 wellventilated room without continuously operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater) and have a room size as specified below.

WARNING

Make sure installation, servicing, maintenance and repair comply with instructions from Daikin and with applicable legislation (for example national gas regulation) and are executed only by authorised persons.

WARNING

If one or more rooms are connected to the unit using a duct system, make sure:

▪ there are no operating ignition sources (example: open flames, an operating gas

appliance or an operating electric heater) in case the floor area is less than the minimum floor area A (m²).

▪ no auxiliary devices, which may be a potential ignition source, are installed in the

duct work (example: hot surfaces with a temperature exceeding 700°C and electric switching device);

▪ only auxiliary devices approved by the manufacturer are used in the duct work; ▪ air inlet AND outlet are connected directly to the same room by ducting. Do NOT

use spaces such as a false ceiling as a duct for the air inlet or outlet.

NOTICE

▪ Precautions shall be taken to avoid excessive vibration or pulsation to

refrigeration piping.

▪ Protection devices, piping and fittings shall be protected as far as possible against

adverse environmental effects.

▪ Provision shall be made for expansion and contraction of long runs of piping. ▪ Piping in refrigerating systems shall be designed and installed such as to minimise

the likelihood of hydraulic shock damaging the system.

▪ The indoor equipment and pipes shall be securely mounted and guarded such

that accidental rupture of equipment or pipes cannot occur from events such as moving furniture or reconstruction activities.

Installer and user reference guide

CAUTION

Do NOT use potential sources of ignition in searching for or detection of refrigerant leaks.

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

NOTICE

▪ Do NOT re-use joints and copper gaskets which have been used already. ▪ Joints made in installation between parts of refrigerant system shall be accessible

for maintenance purposes.

3.1.1 Installation space requirements

CAUTION

The total refrigerant charge in the system cannot exceed the requirements for minimum floor area of the smallest room that is served. For minimum floor area requirements for indoor units, see the installation and operation manual of the outdoor unit.

WARNING

This appliance contains R32 refrigerant. For the minimum floor area of the room in which the appliance is stored refer to installation and operation manual of the outdoor unit.

NOTICE

▪ Pipework shall be protected from physical damage. ▪ Installation of pipework shall be kept to a minimum.

3 | Specific installer safety instructions

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

For the user

Installer and user reference guide

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

4 User safety instructions

Always observe the following safety instructions and regulations.

4.1 General

WARNING

If you are NOT sure how to operate the unit, contact your installer.

WARNING

Children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge can only use this appliance if they have been given supervision or instruction concerning the use of the appliance by a person responsible for their safety.

4 | User safety instructions

Children MUST NOT play with the appliance. Cleaning and user maintenance MUST NOT be carried out

by children without supervision.

WARNING

To 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.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

4 | User safety instructions

▪ Units are marked with the following symbol:

▪ Batteries are marked with the following symbol:

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

This means that the batteries may NOT be mixed with unsorted household waste. If a chemical symbol is printed beneath the symbol, this chemical symbol means 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. By ensuring waste batteries are disposed of correctly, you will help to prevent potential negative consequences for the environment and human health.

4.2 Instructions for safe operation

WARNING

▪ Do NOT modify, disassemble, remove, reinstall or repair

the unit yourself as incorrect dismantling or installation may cause an electric shock or fire. Contact your dealer.

▪ In case of accidental refrigerant leaks, make sure there

are no naked flames. The refrigerant itself is entirely safe, non-toxic and mildly flammable, but it will generate toxic gas when it accidentally leaks into a room where combustible air from fan heaters, gas cookers, etc. is present. Always have qualified service personnel confirm that the point of leakage has been repaired or corrected before resuming operation.

CAUTION

This unit is equipped with electrically powered safety measures, such as a refrigerant leak detector. In order to be effective, the unit must be electrically powered at all times after installation, except for short service periods.

Installer and user reference guide

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

4 | User safety instructions

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

WARNING

This unit contains electrical and hot parts.

WARNING

Before operating the unit, be sure the installation has been carried out correctly by an installer.

CAUTION

It is unhealthy to expose your body to the air flow for a long time.

CAUTION

To avoid oxygen deficiency, ventilate the room sufficiently if equipment with burner is used together with the system.

CAUTION

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

CAUTION

NEVER expose little children, plants or animals directly to the airflow.

WARNING

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Do 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 drain blockage may cause dripping, and objects under the unit may get dirty or damaged.

Installer and user reference guide

4 | User safety instructions

WARNING

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

Maintenance and service (see

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.

CAUTION

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

WARNING

NEVER replace a fuse with a fuse of a wrong ampere ratings or other wires when a fuse blows out. Use of wire or copper wire may cause the unit to break down or cause a fire.

"10Maintenance and service"[431]

)

CAUTION

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

DANGER: RISK OF ELECTROCUTION

To clean the air conditioner or air filter, be sure to stop operation and turn all power supplies off. Otherwise, an electric shock and injury may result.

WARNING

Be careful with ladders when working in high places.

CAUTION

Turn off the unit before cleaning the air filter, suction grille, air outlet and outside panels.

CAUTION

Installer and user reference guide

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

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

4 | User safety instructions

WARNING

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

About the refrigerant (see

WARNING: MILDLY FLAMMABLE MATERIAL

The refrigerant inside this unit is mildly flammable.

WARNING

▪ Do NOT pierce or burn refrigerant cycle parts. ▪ Do NOT use cleaning materials or means to accelerate

the defrosting process other than those recommended by the manufacturer.

▪ Be aware that the refrigerant inside the system is

odourless.

WARNING

The refrigerant inside the unit is mildly flammable, but normally does NOT leak. If the refrigerant leaks in the room and comes in contact with fire from a burner, a heater, or a cooker, this may result in fire, or the formation of a harmful gas.

"10.5About the refrigerant"[435]

)

Turn off any combustible heating devices, ventilate the room, and contact the dealer where you purchased the unit.

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

WARNING

It is necessary to replace the sensor after every detection or at the end of the lifetime. Authorized person only MUST replace the sensor.

WARNING

The appliance shall be stored in a room without continuously operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater).

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

4 | User safety instructions

Troubleshooting (see

WARNING

Stop operation and shut off the power if anything unusual occurs (burning smells etc.).

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

"11Troubleshooting"[438]

)

Installer and user reference guide

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VRV system air conditioner

4P599623-1B – 2020.10

5 About the system

WARNING

▪ Do NOT modify, disassemble, remove, reinstall or repair the unit yourself as

incorrect dismantling or installation may cause an electric shock or fire. Contact your dealer.

▪ In case of accidental refrigerant leaks, make sure there are no naked flames. The

refrigerant itself is entirely safe, non-toxic and mildly flammable, but it will generate toxic gas when it accidentally leaks into a room where combustible air from fan heaters, gas cookers, etc. is present. Always have qualified service personnel confirm that the point of leakage has been repaired or corrected before resuming operation.

NOTICE

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

NOTICE

For future modifications or expansions of your system:

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

5 | About the system

5.1 System layout

CAUTION

INFORMATION

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

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

5 | About the system

5.2 Information requirements for fan coil units

a Indoor unit

b Outdoor unit

c User interface d Suction air e Discharge air

f Refrigerant piping + transmission cable g Drain pipe h Suction grille and air filter

Item Symbol Value Unit

Cooling capacity (sensible) P Cooling capacity (latent) P Heating capacity P Total electric power input P Sound power level (per speed setting, if

rated,c

rated,h

elec

A kW B kW C kW D kW E dB

applicable) Contact details:

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

A B C D E

FXZA15 1.2 0.5 1.9 0.036 49

FXZA20 1.5 0.7 2.5 0.036 49

FXZA25 1.9 0.9 3.2 0.036 50

FXZA32 2.5 1.1 4 0.038 51

FXZA40 3.1 1.4 5 0.053 54

FXZA50 3.8 1.8 6.3 0.086 60

Installer and user reference guide

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VRV system air conditioner

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6 User interface

CAUTION

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

NOTICE

Do NOT wipe the controller operation panel with benzine, thinner, chemical dust cloth, etc. The panel may get discoloured or the coating peeled off. If it is heavily dirty, soak a cloth in water-diluted neutral detergent, squeeze it well and wipe the panel clean. Wipe it with another dry cloth.

NOTICE

NEVER press the button of the user interface with a hard, pointed object. The user interface may be damaged.

6 | User interface

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

NOTICE

NEVER pull or twist the electric wire of the user interface. It may cause the unit to malfunction.

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

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

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

7 | Before operation

7 Before operation

WARNING

This unit contains electrical and hot parts.

WARNING

Before operating the unit, be sure the installation has been carried out correctly by an installer.

CAUTION

It is unhealthy to expose your body to the air flow for a long time.

CAUTION

To avoid oxygen deficiency, ventilate the room sufficiently if equipment with burner is used together with the system.

CAUTION

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

NOTICE

Be sure to turn ON the power 6 hours before operation in order to have power running to the crankcase heater and to protect the compressor.

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

Installer and user reference guide

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VRV system air conditioner

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8 Operation

8.1 Operation range

INFORMATION

For the operation limits see the technical data of the connected outdoor unit.

8.2 About operation modes

INFORMATION

Depending 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 fan

may stop immediately. This is not a malfunction.

8 | Operation

▪ If the main power supply is turned off during operation, operation will restart

automatically after the power turns back on again.

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

modes.

▪ Setback. A function that keeps the room temperature in a specific range when

the 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 the

setpoint, or by Setback operation.

Heating. In this mode, heating will be activated as required by the 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 a

minimal temperature decrease.

The temperature and fan speed are controlled automatically and cannot be controlled by the controller.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Dry operation will not function if the room temperature is too low.

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

Installer and user reference guide

8 | Operation

8.2.2 Special heating operation modes

Operation Description

Defrost To prevent a loss of heating capacity

due to frost accumulation in the outdoor unit, the system will automatically switch to defrost operation.

During defrost operation, the indoor unit fan will stop operation, and the following icon will appear on the home screen:

The system will resume normal operation after approximately 6 to 8 minutes.

Hot start During hot start, the indoor unit fan will

stop operation, and the following icon will appear on the home screen:

8.2.3 Adjusting the airflow direction

The following airflow directions can be set:

Fixed position. The indoor unit blows air in 1 of 4 fixed positions.

Swing. The indoor unit alternates between the 4 positions.

Auto. The indoor unit adjusts its airflow direction according to movement sensed by a movement sensor.

INFORMATION

Depending on system layout and organisation, Auto airflow direction may not be available.

Direction Screen

Installer and user reference guide

INFORMATION

For setting procedure of the airflow direction, see the reference guide or the manual of the used user interface.

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8 | Operation

Automatic airflow control

In the following operating conditions, the airflow direction of the indoor units is controlled automatically:

▪ When the room temperature is higher than the controller's setpoint for heating

operation (including auto operation).

▪ When the indoor units run in heating operation mode, and the Defrost function

is active.

▪ When the indoor units run in Continuous operation, and the airflow direction is

Horizontal.

WARNING

Never touch the air outlet or the horizontal blades while the swing flap is in operation. Fingers may become caught or the unit may break down.

NOTICE

Avoid operating in the horizontal direction. It may cause dew or dust to settle on the ceiling or flap.

8.3 To operate the system

INFORMATION

For setting of the operation mode, airflow direction or other settings, see the reference guide or operation manual of the user interface.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

9 | Energy saving and optimum operation

9 Energy saving and optimum operation

CAUTION

NEVER expose little children, plants or animals directly to the airflow.

WARNING

Do NOT place a flammable spray bottle near the air conditioner and do NOT use sprays 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 using

curtains 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 temperature

setting at a moderate level.

▪ NEVER place objects near the air inlet or the air outlet of the unit. Doing so may

cause a reduced heating/cooling effect or stop operation.

▪ When the display shows (time to clean the air filter), clean the filters (see

"10.2.1To clean the air filter"[432]).

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

blocked.

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

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10 Maintenance and service

10.1 Precautions for maintenance and service

NOTICE

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

We recommend performing maintenance at least once a year. However, applicable legislation 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.

CAUTION

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

10 | Maintenance and service

NOTICE

NEVER inspect or service the unit by yourself. Ask a qualified service person to perform this work. However, as end user, you may clean the air filter, suction grille, air outlet and outside panels.

WARNING

NEVER replace a fuse with a fuse of a wrong ampere ratings or other wires when a fuse blows out. Use of wire or copper wire may cause the unit to break down or cause a fire.

CAUTION

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

NOTICE

CAUTION

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

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

DANGER: RISK OF ELECTROCUTION

To clean the air conditioner or air filter, be sure to stop operation and turn all power supplies off. Otherwise, an electric shock and injury may result.

WARNING

Be careful with ladders when working in high places.

Installer and user reference guide

10 | Maintenance and service

Following symbols may occur on the indoor unit:

Symbol Explanation

10.2 Cleaning the air filter, suction grille, air outlet and outside panels

10.2.1 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.

Measure the voltage at the terminals of main circuit capacitors or electrical components before servicing.

CAUTION

Turn off the unit before cleaning the air filter, suction grille, air outlet and outside panels.

▪ Depending on the settings, the user interface can display the "Time to clean

filter" notification. Clean the air filter when the notification is displayed.

▪ If the dirt becomes impossible to clean, change the air filter (= optional

equipment).

How to clean the air filter:

NOTICE

Do NOT use water of 50°C or higher. Possible consequence: Discoloration and deformation.

1 Open the suction grille.

BYFQ60B BYFQ60C

2 Remove the air filter.

Installer and user reference guide

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10 | Maintenance and service

BYFQ60B BYFQ60C

3 Clean the air filter. Use a vacuum cleaner or wash with water. If the air filter is

very dirty, use a soft brush and neutral detergent.

4 Dry the air filter in the shadow.

5 Reattach the air filter and close the suction grille.

6 Turn ON the power.

7 To remove warning screens, see the reference guide of the user interface.

10.2.2 To clean the suction grille

1 Open the suction grille.

NOTICE

Do NOT use water of 50°C or higher. Possible consequence: Discoloration and deformation.

BYFQ60B BYFQ60C

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

2 Remove the suction grille.

Installer and user reference guide

10 | Maintenance and service

45°

90°

BYFQ60B

BYFQ60C

3 Remove the air filter.

BYFQ60B

4 Clean the suction grille. Wash with a soft bristle brush and water or neutral

detergent. If the suction grille is very dirty, use a typical kitchen cleaner, leave it on for 10min, then wash it with water.

5 Reattach the air filter (step 3 in reverse order).

6 Reattach the suction grille and close it (step 2 and 1 in reverse order).

10.2.3 To clean the air outlet and outside panels

BYFQ60C

Installer and user reference guide

WARNING

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

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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: Discoloration

and deformation.

▪ Do NOT scrub firmly when washing the blade with water. Possible consequence:

The surface sealing peels off.

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

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 dry

the interior of the units.

▪ Clean air filters and casings of indoor units (see "10.2.1 To clean the air

filter"[432] and "10.2.3To clean the air outlet and outside panels"[434]).

10 | Maintenance and service

▪ 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 of

indoor units and outdoor units.

▪ Clean air filters and casings of indoor units (see "10.2.1 To clean the air

filter"[432] and "10.2.3To clean the air outlet and outside panels"[434]).

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

10.5 About the refrigerant

This product contains fluorinated greenhouse gases. Do NOT vent gases into the atmosphere.

Refrigerant type: R32

Global warming potential (GWP) value: 675

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

NOTICE

Applicable legislation on fluorinated greenhouse gases requires that the refrigerant charge of the unit is indicated both in weight and CO2 equivalent.

Formula to calculate the quantity in CO2 equivalent tonnes: GWP value of the refrigerant × total refrigerant charge [in kg] / 1000

Please contact your installer for more information.

WARNING: MILDLY FLAMMABLE MATERIAL

The refrigerant inside this unit is mildly flammable.

Installer and user reference guide

10 | Maintenance and service

WARNING

The appliance shall be stored in a room without continuously operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater).

WARNING

▪ Do NOT pierce or burn refrigerant cycle parts. ▪ Do NOT use cleaning materials or means to accelerate the defrosting process

other than those recommended by the manufacturer.

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

WARNING

Turn off any combustible heating devices, ventilate the room, and contact the dealer where you purchased the unit.

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

10.5.1 About the refrigerant leakage sensor

WARNING

It is necessary to replace the sensor after every detection or at the end of the lifetime. Authorized person only MUST replace the sensor.

NOTICE

Functionality of the safety measures are periodically automatically checked. In case of malfunction, error code will display on the user interface.

NOTICE

The R32 refrigerant leakage sensor is a semiconductor detector which may incorrectly detect substances other than R32 refrigerant. Avoid using chemical substances (e.g. organic solvents, hair spray, paint) in high concentrations, in the close proximity of the indoor unit because this may cause misdetection of the R32 refrigerant leakage sensor.

INFORMATION

Lifetime of the sensor is 10years. The user interface displays error "CH-05" 6months before the end of the sensor lifetime and error "CH-02" after the end of the sensor lifetime. For more information refer to the reference guide of the user interface and contact you dealer.

Installer and user reference guide

In case of detection when the unit is standby

When the detection occurs when the unit is standby, "false detection check" will occur.

False detection check

1 Unit starts fan operation on the lowest setting.

2 User interface displays error code "A0-13", emits alarm sound and status

indicator is blinking.

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10 | Maintenance and service

3 Sensor checks if refrigerant leakage or misdetection occurred.

▪ If refrigerant leakage is NOT detected, Result: system returns to normal

operation after approximately 2 minutes.

▪ If refrigerant leakage is detected, Result:

1 User interface displays error "A0-11", emits alarm sound and status indicator

is blinking.

2 Contact your dealer immediately. For more information, see the installation

manual of the outdoor unit.

In case of detection when the unit is turned on

1 User interface displays error "A0-11", emits alarm sound and status indicator

is blinking.

2 Contact your dealer immediately. For more information, see the installation

manual of the outdoor unit.

INFORMATION

To stop alarm of the user interface see the reference guide of the user interface.

INFORMATION

The minimum airflow during normal operation or during the refrigerant leakage detection is always >240m3/h.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

11 | Troubleshooting

11 Troubleshooting

If one of the following malfunctions occur, take the measures shown below and contact your dealer.

WARNING

Stop operation and shut off the power if anything unusual occurs (burning smells etc.).

Leaving the unit running under such circumstances may cause breakage, electric shock 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 circuit breaker or a residual current device frequently actuates

Turn OFF all main power supply

switches to the unit. or the ON/OFF switch does NOT function properly.

If water leaks from the unit. Stop operation.

The operation switch does NOT function

Turn OFF the power supply. properly.

If the user interface displays . Notify your installer and report

the error code. To display an

error code see the reference

guide of the user interface.

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

Malfunction Measure

If the system does not operate at all.

▪ Check if there is no power failure. Wait until

power is restored. If power failure occurs during operation, the system automatically restarts immediately after power is restored.

▪ Check if no fuse has blown or breaker is activated.

Change the fuse or reset the breaker if necessary.

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11 | Troubleshooting

Malfunction Measure

The system operates but cooling or heating is insufficient.

▪ Check if air inlet or outlet of outdoor or indoor

unit is not blocked by obstacles. Remove any obstacles and make sure the air can flow freely.

▪ Check if the air filter is not clogged (see "10.2.1To

clean the air filter"[432]).

▪ Check the temperature setting.

▪ Check the fan speed setting on your user

interface.

▪ Check for open doors or windows. Close doors and

windows to prevent wind from coming in.

▪ Check if there are too many occupants in the room

during cooling operation. Check if the heat source of the room is excessive.

▪ Check if direct sunlight enters the room. Use

curtains or blinds.

▪ Check if the air flow angle is proper.

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

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 the

user interface is pressed. If the operation lamp lights, the system is in normal condition. To prevent overloading of the compressor motor, the air conditioner starts 5 minutes after it is turned ON again in case it was turned OFF just before. The same starting delay occurs after the operation mode selector button was used.

▪ The system does not start immediately after the power supply is turned on. Wait

one minute until the micro computer is prepared for operation.

11.1.2 Symptom: The fan speed does not correspond to the setting

The fan speed does not change even if the fan speed adjustment button in pressed. During heating operation, when the room temperature reaches the set temperature, the outdoor unit goes off and the indoor unit changes to whisper fan speed. This is to prevent cold air blowing directly on occupants of the room. The fan speed will not change if the button is pressed.

11.1.3 Symptom: The fan direction does not correspond to the setting

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

The fan direction does not correspond with the user interface display. The fan direction does not swing. This is because the unit is being controlled by the micro computer.

Installer and user reference guide

11 | Troubleshooting

11.1.4 Symptom: White mist comes out of a unit (Indoor unit)

11.1.5 Symptom: White mist comes out of a unit (Indoor unit, outdoor unit)

11.1.6 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes

▪ When humidity is high during cooling operation. If the interior of an indoor unit is

extremely contaminated, the temperature distribution inside a room becomes uneven. It is necessary to clean the interior of the indoor unit. Ask your dealer for details on cleaning the unit. This operation requires a qualified service person.

▪ Immediately after the cooling operation stops and if the room temperature and

humidity are low. This is because warm refrigerant gas flows back into the indoor unit and generates steam.

When the system is changed over to heating operation after defrost operation. Moisture generated by defrost becomes steam and is exhausted.

This is because the user interface is intercepting noise from electric appliances other than the air conditioner. The noise prevents communication between the units, causing them to stop. Operation automatically restarts when the noise ceases.

11.1.7 Symptom: Noise of air conditioners (Indoor unit)

▪ A "zeen" sound is heard immediately after the power supply is turned on. The

electronic expansion valve inside an indoor unit starts working and makes the noise. Its volume will reduce in about one minute.

▪ A continuous low "shah" sound is heard when the system is in cooling operation

or at a stop. When the drain pump is in operation, this noise is heard.

▪ A "pishi-pishi" squeaking sound is heard when the system stops after heating

operation. Expansion and contraction of plastic parts caused by temperature change make this noise.

11.1.8 Symptom: Noise of air conditioners (Indoor unit, outdoor unit)

▪ A continuous low hissing sound is heard when the system is in cooling or defrost

operation. This is the sound of refrigerant gas flowing through both indoor and outdoor units.

▪ A hissing sound which is heard at the start or immediately after stopping

operation or defrost operation. This is the noise of refrigerant caused by flow stop or flow change.

11.1.9 Symptom: Dust comes out of the unit

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

11.1.10 Symptom: The units can give off odours

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

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FXZA15~50A2VEB

VRV system air conditioner

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12 Relocation

Contact your dealer for removing and reinstalling the total unit. Moving units requires technical expertise.

12 | Relocation

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

13 | Disposal

13 Disposal

NOTICE

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

Installer and user reference guide

FXZA15~50A2VEB

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For the installer

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

For the installer

Installer and user reference guide

14 | About the box

1 2

14 About the box

14.1 Overview: About the box

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

It contains information about:

▪ Unpacking and handling the unit

▪ Removing the accessories from the unit

Keep the following in mind:

▪ At delivery, the unit MUST be checked for damage. Any damage MUST be

reported immediately to the claims agent of the carrier.

▪ Bring the packed unit as close as possible to its final installation position to

prevent damage during transport.

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

14.2 Indoor unit

14.2.1 To unpack and handle the unit

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

1 Lift the unit by holding on to the hanger brackets without exerting any

pressure on other parts, especially on refrigerant piping, drain piping and other resin parts.

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14.2.2 To remove the accessories from the indoor unit

7×

1× 1×

4×

1×

dcb

j k

4×8×

a Paper pattern for installation (upper part of packing) b General safety precautions c Indoor unit installation and operation manual d Tie wraps e Sealing pads: Large (drain pipe), medium 1 (gas pipe), medium 2 (liquid pipe), small (electrical wiring)

f Metal clamp g Drain hose h Washers for hanger bracket

i Screws

j Insulation piece: Small (liquid pipe) k Insulation piece: Large (gas pipe)

14 | About the box

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

15 | About the units and options

15 About the units and options

In this chapter

15.1 Identification........................................................................................................................................................................... 46

15.1.1 Identification label: Indoor unit ............................................................................................................................. 46

15.2 About the indoor unit ............................................................................................................................................................. 46

15.3 System layout.......................................................................................................................................................................... 46

15.4 Combining units and options.................................................................................................................................................. 47

15.4.1 Possible options for the indoor unit ...................................................................................................................... 47

15.1 Identification

15.1.1 Identification label: Indoor unit

NOTICE

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

Location

15.2 About the indoor unit

INFORMATION

For the operation limits see the technical data of the connected outdoor unit.

15.3 System layout

Installer and user reference guide

INFORMATION

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

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

a Indoor unit b Outdoor unit c User interface d Suction air e Discharge air

f Refrigerant piping + transmission cable g Drain pipe h Suction grille and air filter

15 | About the units and options

15.4 Combining units and options

INFORMATION

Certain options might not be available in your country.

15.4.1 Possible options for the indoor unit

Make sure you have the following mandatory options:

▪ User interface: Only a safety system compatible remote controller can be used.

See technical data sheet for remote controller compatibility (e.g. BRC1H52/82*)

Note: The user interface will generate a visible and audible warning sign in case of refrigerant leakage detection. E.g. the BRC1H52* remote controllers can generate an alarm of 65dB (sound pressure, measured at 1m distance of the alarm). Sound data is available in the technical data sheet of the remote controller. The alarm should always be 15dB louder than the background noise of the room. In case of higher background noise we recommend to use an external alarm (field supply) to connect to the optional output PCB of the indoor unit. This field supply alarm has to be mounted in every room where an indoor unit is installed.

CAUTION

▪ Each indoor unit has to be connected to a separate user interface. Only a safety

system compatible remote controller can be used as the user interface. See technical data sheet for remote controller compatibility (e.g. BRC1H52/82*).

▪ The user interface has to be put in the same room as the indoor unit. For details,

please refer to the installation and operation manual of the user interface.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

15 | About the units and options

▪ Optional output PCB (to provide output for external device): The PCB will trigger

in case of leak detection, sensor fails or when sensor is disconnected. For exact model name see option list of the indoor unit. For more information about this option, refer to the installation manual of the optional output PCB.

▪ Decoration panel: Standard

INFORMATION

All possible options are mentioned in the option list of the indoor unit. For more information about an option, refer to the installation and operation manual of the option.

Installer and user reference guide

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VRV system air conditioner

4P599623-1B – 2020.10

16 Unit installation

In this chapter

16.1 Preparing the installation site ................................................................................................................................................ 49

16.1.1 Installation site requirements of the indoor unit.................................................................................................. 49

16.2 Mounting the indoor unit ....................................................................................................................................................... 51

16.2.1 Guidelines when installing the indoor unit............................................................................................................ 51

16.2.2 Guidelines when installing the drain piping .......................................................................................................... 54

16.1 Preparing the installation site

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

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

Avoid installation in an environment with a lot of organic solvents such as ink and siloxane.

16 | Unit installation

WARNING

The appliance shall be stored in a room without continuously operating ignition sources (example: open flames, an operating gas appliance or an operating electric heater).

16.1.1 Installation site requirements of the indoor unit

INFORMATION

Also read the general installation site requirements. See the ""2 General safety

precautions"[45]" chapter.

INFORMATION

The sound pressure level is less than 70dBA.

CAUTION

Appliance not accessible to the general public, install it in a secured area, protected from easy access.

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

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Do NOT install the unit in the following places:

▪ In places where a mineral oil mist, spray or vapour may be present in the

atmosphere. Plastic parts may deteriorate and fall off or cause water leakage.

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

▪ Where the voltage fluctuates a lot

▪ In vehicles or vessels

▪ Where acidic or alkaline vapour is present

Installer and user reference guide

16 | Unit installation

a b c

(mm)

≥1500

≥

2000

≥

4000

≥1500

ba dac

NOTICE

The equipment described in this manual may cause electronic noise generated from radio-frequency energy. The equipment complies to specifications that are designed to provide reasonable protection against such interference. However, there is no guarantee that interference will not occur in a particular installation.

It is therefore recommended to install the equipment and electric wires in such a way 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 avoid electromagnetic disturbance of other equipment and use conduit tubes for power and transmission lines.

▪ Take care that in the event of a water leak, water cannot cause any damage to

the installation space and surroundings.

▪ Choose a location where the operation noise or the hot/cold air discharged from

the unit will not disturb anyone.

▪ Air flow. Make sure nothing blocks the air flow.

▪ Drainage. Make sure condensation water can be evacuated properly.

▪ Paper pattern for installation (upper part of packing) (accessory). When

selecting the installation location, use the paper pattern. It contains the dimensions of the unit and the required ceiling opening.

▪ Air flow directions. You can select different air flow directions. Choose the one

best suited for the room. For more information, see the installation manual of the optional blocking pad kit.

Example:

a 4-way air flow (all air outlets open) b 3-way air flow (1 air outlet closed) (optional blocking pad kit required)

c 2-way air flow (2 air outlets closed) (optional blocking pad kit required)

▪ 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 additional insulation is required (minimum 10mm thickness, polyethylene foam).

▪ Spacing. Mind the following requirements:

Installer and user reference guide

A Minimum distance to the wall

≥1500mm: Air outlet open

≥200mm: Air outlet closed B Minimum and maximum distance to the floor (see below) C ≥295mm: In case of installation with BYFQ60B

≥308mm: In case of installation with BYFQ60C a Indoor unit b Lighting (the figure shows ceiling-mounted lighting, but recessed lighting is also allowed)

c Air fan

d Static volume (example: table)

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

16 | Unit installation

450

(mm)

(300)

▪ B: Minimum and maximum distance to the floor:

- Minimum: 2.7m to avoid accidental touching.

- Maximum: Depends on the air flow directions and the capacity class. Also make

sure the "Ceiling height" field setting corresponds with the actual situation. See

"20.1Field setting"[469].

▪ Install inspection opening on the control box side to make maintenance easier.

a Inspection opening

INFORMATION

Some options may require additional service space. Refer to the installation manual of the used option before installation.

Minimum floor area requirements

CAUTION

16.2 Mounting the indoor unit

16.2.1 Guidelines when installing the indoor unit

INFORMATION

Optional equipment. When installing optional equipment, also read the installation

manual of the optional equipment. Depending on the field conditions, it might be easier to install the optional equipment first.

▪ Decoration panel. Install the decoration panel always after installing the unit.

NOTICE

After installing the decoration panel:

▪ Make sure there is no gap between the unit body and the decoration panel.

Possible consequence: Air might leak and cause dew drop.

▪ Make sure no oil remains on the plastic parts of the decoration panel. Possible

consequence: Degradation and damage of plastic parts.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

▪ Ceiling strength. Check whether the ceiling is strong enough to support the

weight of the unit. If there is a risk, reinforce the ceiling before installing the unit.

- For existing ceilings, use anchors.

- For new ceilings, use sunken inserts, sunken anchors or other field supplied

parts.

Installer and user reference guide

16 | Unit installation

(mm)

a1 b

b a2

4×

533

a cb d

A 50~100 mm a Ceiling slab b Anchor

c Long nut or turnbuckle d Suspension bolt e Suspended ceiling

▪ Suspension bolts. Use M8~M10 suspension bolts for installation. Attach the

hanger bracket to the suspension bolt. Fix it securely using a nut and washer from the upper and lower sides of the hanger bracket.

a1 Nut (field supply) a2 Double nut (field supply)

b Washer (accessories)

c Hanger bracket (attached to the unit)

▪ Paper pattern for installation (upper part of the packing). Use the paper pattern

to determine the correct horizontal positioning. It contains the necessary dimensions and centers. You can attach the paper pattern to the unit.

a Centre of the unit b Centre of the ceiling opening

c Paper pattern for installation (upper part of the packing) d Screws (accessories)

▪ Ceiling opening and unit:

- Make sure the ceiling opening is within the following limits:

Minimum: 585mm to be able to fit the unit.

Maximum: 660mm in case of installation with BYFQ60B and 595mm in case of

installation with BYFQ60C ensure enough overlapping between the decoration panel and the suspended ceiling. If the ceiling opening is larger, add extra ceiling material.

Installer and user reference guide

- Make sure the unit and its hanger brackets (suspension) are centered within

the ceiling opening.

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VRV system air conditioner

4P599623-1B – 2020.10

(mm)

c d

A B

533

350

575

533

575

A 585~660mm: In case of installation with BYFQ60B

bba

585~595 mm: In case of installation with BYFQ60C

B 700mm: In case of installation with BYFQ60B

620 mm: In case of installation with BYFQ60C

a Drain piping

b Refrigerant piping

c Hanger bracket pitch (suspension)

d Unit

Example If A

16 | Unit installation

(a)

BYFQ60B

Then

(a)

585mm 5mm 57.5mm

660mm 42.5mm 20mm

BYFQ60C

585mm 5mm 17.5mm

595mm 10mm 12.5mm

(a)

A: Ceiling opening

B: Distance between the unit and the ceiling opening

C: Overlap between the decoration panel and the suspended ceiling

▪ Level. Make sure the unit is level at all 4 corners using a level or a water-filled

vinyl tube.

a Level

b Vinyl tube

c Water level

NOTICE

Do NOT install the unit tilted. Possible consequence: If the unit is tilted against the

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

direction of the condensate flow (the drain piping side is raised), the float switch might malfunction and cause water to drip.

Installer and user reference guide

16 | Unit installation

1~1.5 m

≤675

≤300

0~75

1000~1500

(mm)

b c

≥100

≤675

(mm)

16.2.2 Guidelines when installing the drain piping

General guidelines

Make sure condensation water can be evacuated properly. This involves:

▪ General guidelines

▪ Connecting the drain piping to the indoor unit

▪ Checking for water leaks

▪ Pipe length. Keep drain piping as short as possible.

▪ Pipe size. Keep the pipe size equal to or greater than that of the connecting pipe

(vinyl pipe of 25mm nominal diameter and 32mm outer diameter).

▪ Slope. Make sure the drain piping slopes down (at least 1/100) to prevent air

from being trapped in the piping. Use hanging bars as shown.

a Hanging bar

O Allowed

X Not allowed

▪ Condensation. Take measures against condensation. Insulate the complete drain

piping in the building.

▪ Rising piping. If necessary to make the slope possible, you can install rising

piping.

- Drain hose inclination: 0~75mm to avoid stress on the piping and to avoid air

bubbles.

a Metal clamp (accessory) b Drain hose (accessory)

c Rising drain piping (vinyl pipe of 25mm nominal diameter and 32mm outer diameter) (field supply) d Hanging bars (field supply)

▪ Combining drain pipes. You can combine drain pipes. Make sure to use drain

pipes and T-joints with a correct gauge for the operating capacity of the units.

Installer and user reference guide

a T-joint

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VRV system air conditioner

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To connect the drain piping to the indoor unit

≤4 mm

A-A'

542

b a

d c

2~51

NOTICE

Incorrect connection of the drain hose might cause leaks, and damage the installation space and surroundings.

1 Push the drain hose as far as possible over the drain pipe connection.

2 Tighten the metal clamp until the screw head is less than 4 mm from the

metal clamp part.

3 Check for water leaks (see "To check for water leaks"[455]).

4 Wind the large sealing pad (= insulation) around the metal clamp and drain

hose, and fix it with tie wraps.

5 Connect the drain piping to the drain hose.

16 | Unit installation

a Drain pipe connection (attached to the unit)

b Drain hose (accessory)

c Metal clamp (accessory)

d Large sealing pad (accessory)

e Drain piping (field supply)

To check for water leaks

The procedure differs depending on whether installation of the system is already completed. When installation of the system is not yet completed, temporarily connect the user interface and power supply to the unit.

When installation of the system is not yet completed

1 Temporarily connect electrical wiring.

▪ Remove the service cover (a). ▪ Connect the power supply (d). ▪ Connect the user interface (f). ▪ Reattach the service cover (a).

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Installer and user reference guide

16 | Unit installation

1×

c d

1×

P1P2 F1F2 T1T2

≥100 mm

a Service cover with wiring diagram b Opening for cables

c User interface terminal block d Power supply terminal block

2 Turn ON the power.

3 Start fan only operation (see the reference guide or the service manual of the

user interface).

4 Gradually pour approximately 1 l of water through the air discharge outlet,

and check for leaks.

a Plastic watering can b Service drain outlet (with rubber plug). Use this outlet to drain water from the drain pan.

c Drain pump location d Drain pipe connection e Drain pipe

5 Turn OFF the power.

6 Disconnect the electrical wiring.

▪ Remove the service cover. ▪ Disconnect the power supply. ▪ Disconnect the user interface. ▪ Reattach the service cover.

When installation of the system is already completed

1 Start cooling operation (see the reference guide or the service manual of the

user interface).

2 Gradually pour approximately 1l of water through the water inlet, and check

for leaks (see "When installation of the system is not yet completed"[455]).

Installer and user reference guide

FXZA15~50A2VEB

VRV system air conditioner

4P599623-1B – 2020.10

17 Piping installation

In this chapter

17.1 Preparing refrigerant piping ................................................................................................................................................... 57

17.1.1 Refrigerant piping requirements ........................................................................................................................... 57

17.1.2 Refrigerant piping insulation.................................................................................................................................. 58

17.2 Connecting the refrigerant piping .......................................................................................................................................... 58

17.2.1 About connecting the refrigerant piping............................................................................................................... 58

17.2.2 Precautions when connecting the refrigerant piping............................................................................................ 59

17.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 59

17.2.4 Pipe bending guidelines ......................................................................................................................................... 60

17.2.5 To flare the pipe end.............................................................................................................................................. 60

17.2.6 To connect the refrigerant piping to the indoor unit............................................................................................ 61

17.1 Preparing refrigerant piping

17.1.1 Refrigerant piping requirements

INFORMATION

Also read the precautions and requirements in the "2 General safety

precautions"[45].

17 | Piping installation

▪ Foreign materials inside pipes (including oils for fabrication) must be

≤30mg/10m.

Refrigerant piping diameter

For piping connections of the indoor unit use the following piping diameters:

15~32 Ø6.4 Ø9.5

40+50 Ø6.4 Ø12.7

Refrigerant piping material

CAUTION

Piping MUST be installed according to instructions given in "17 Piping

installation" [4 57]. Only mechanical joints (e.g. braze+flare connections) that are

compliant with the latest version of ISO14903 can be used.

NOTICE

The piping and other pressure-containing parts shall be suitable for refrigerant. Use phosphoric acid deoxidised seamless copper for refrigerant.

Class Pipe outer diameter (mm)

Liquid pipe Gas pipe

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

▪ Piping material: Phosphoric acid deoxidised seamless copper.

▪ Flare connections: Only use annealed material.

▪ Piping temper grade and thickness:

Installer and user reference guide

17 | Piping installation

ØiØ

ØpØ

Outer diameter (Ø) Temper grade Thickness (t)

6.4mm (1/4") Annealed (O) ≥0.8mm

9.5mm (3/8")

12.7mm (1/2")

(a)

Depending on the applicable legislation and the maximum working pressure of the unit (see "PS High" on the unit name plate), larger piping thickness might be required.

17.1.2 Refrigerant piping insulation

▪ Use polyethylene foam as insulation material:

- with a heat transfer rate between 0.041 and 0.052 W/mK (0.035 and

0.045kcal/mh°C)

- with a heat resistance of at least 120°C

▪ Insulation thickness

Pipe outer diameter (Øp) Insulation inner diameter

6.4mm (1/4") 8~10mm ≥10mm

9.5mm (3/8") 12~15mm ≥13mm

(a)

Insulation thickness (t)

(Øi)

12.7mm (1/2") 14~16mm ≥13mm

If the temperature is higher than 30°C and the humidity is higher than RH80%, the thickness of the insulation materials should be at least 20 mm to prevent condensation on the surface of the insulation.

17.2 Connecting the refrigerant piping

17.2.1 About connecting the refrigerant piping

Before connecting the refrigerant piping

Make sure the outdoor and indoor unit are mounted.

Typical workflow

Connecting the refrigerant piping involves:

▪ Connecting the refrigerant piping to the indoor unit

▪ Connecting the refrigerant piping to the outdoor unit

▪ Insulating the refrigerant piping

▪ Keeping in mind the guidelines for:

- Pipe bending

- Flaring pipe ends

- Using the stop valves

Installer and user reference guide

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VRV system air conditioner

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17.2.2 Precautions when connecting the refrigerant piping

INFORMATION

Also read the precautions and requirements in the following chapters:

▪ General safety precautions ▪ Preparation

DANGER: RISK OF BURNING/SCALDING

CAUTION

▪ Do NOT use mineral oil on flared part. ▪ Do NOT reuse piping from previous installations. ▪ NEVER install a drier to this R32 unit to guarantee its lifetime. The drying material

may dissolve and damage the system.

NOTICE

Take the following precautions on refrigerant piping into account:

▪ Avoid anything but the designated refrigerant to get mixed into the refrigerant

cycle (e.g. air).

▪ Only use R32 when adding refrigerant. ▪ Only use installation tools (e.g. manifold gauge set) that are exclusively used for

R32 installations to withstand the pressure and to prevent foreign materials (e.g. mineral oils and moisture) from mixing into the system.

▪ Install the piping so that the flare is NOT subjected to mechanical stress. ▪ Protect the piping as described in the following table to prevent dirt, liquid or

dust from entering the piping.

▪ Use caution when passing copper tubes through walls (see figure below).

17 | Piping installation

17.2.3 Guidelines when connecting the refrigerant piping

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

Unit Installation period Protection method

Outdoor unit >1month Pinch the pipe

<1month Pinch or tape the pipe

Indoor unit Regardless of the period

INFORMATION

Do NOT open the refrigerant stop valve before checking the refrigerant piping. When you need to charge additional refrigerant it is recommended to open the refrigerant stop valve after charging.

Take the following guidelines into account when connecting pipes:

Installer and user reference guide

17 | Piping installation

0.4~0.8

±2

45°

90°

±2

ØA

a b

▪ Coat the flare inner surface with ether oil or ester oil when connecting a flare

nut. Tighten 3 or 4 turns by hand, before tightening firmly.

▪ ALWAYS use 2 wrenches together when loosening a flare nut.

▪ ALWAYS use a spanner and torque wrench together to tighten the flare nut when

connecting the piping. This to prevent nut cracking and leaks.

a Torque wrench b Spanner

c Piping union d Flare nut

Piping size (mm) Tightening torque

(N•m)

Flare dimensions

(A) (mm)

Flare shape (mm)

Ø6.4 15~17 8.7~9.1

Ø9.5 33~39 12.8~13.2

Ø12.7 50~60 16.2~16.6

17.2.4 Pipe bending guidelines

Use a pipe bender for bending. All pipe bends should be as gentle as possible (bending radius should be 30~40 mm or larger).

17.2.5 To flare the pipe end

1 Cut the pipe end with a pipe cutter.

2 Remove burrs with the cut surface facing down so that the chips do NOT enter

the pipe.

CAUTION

cause refrigerant gas leakage.

Installer and user reference guide

a Cut exactly at right angles. b Remove burrs.

3 Remove the flare nut from the stop valve and put the flare nut on the pipe.

4 Flare the pipe. Set exactly at the position as shown in the following figure.

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VRV system air conditioner

4P599623-1B – 2020.10

17 | Piping installation

a b

a dc e fb b

A B

Flare tool for R32

(clutch type)

A 0~0.5mm 1.0~1.5mm 1.5~2.0mm

5 Check that the flaring is properly made.

a Flare’s inner surface MUST be flawless.

b The pipe end MUST be evenly flared in a perfect circle.

c Make sure the flare nut is fitted.

17.2.6 To connect the refrigerant piping to the indoor unit

CAUTION

Conventional flare tool

Clutch type

(Ridgid-type)

Wing nut type

(Imperial-type)

WARNING: MILDLY FLAMMABLE MATERIAL

The refrigerant inside this unit is mildly flammable.

▪ Pipe length. Keep refrigerant piping as short as possible.

▪ Flare connections. Connect refrigerant piping to the unit using flare connections.

▪ Insulation. Insulate the refrigerant piping on the indoor unit as follows:

A Gas piping B Liquid piping

a Insulation material (field supply)

b Tie wrap (accessory)

c Insulation pieces: Large (gas pipe), small (liquid pipe) (accessories)

d Flare nut (attached to the unit)

e Refrigerant pipe connection (attached to the unit)

f Unit

g Sealing pads: Medium 1 (gas pipe), medium 2 (liquid pipe) (accessories)

1 Turn up the seams of the insulation pieces. 2 Attach to the base of the unit. 3 Tighten the tie wrap on the insulation pieces. 4 Wrap the sealing pad from the base of the unit to the top of the flare nut.

FXZA15~50A2VEB VRV system air conditioner 4P599623-1B – 2020.10

NOTICE

Make sure to insulate all refrigerant piping. Any exposed piping might cause condensation.

Installer and user reference guide

18 | Electrical installation

18 Electrical installation

In this chapter

18.1 About connecting the electrical wiring

18.1 About connecting the electrical wiring .................................................................................................................................. 62

18.1.1 Precautions when connecting the electrical wiring .............................................................................................. 62

18.1.2 Guidelines when connecting the electrical wiring ................................................................................................ 63

18.1.3 Specifications of standard wiring components ..................................................................................................... 64

18.2 To connect the electrical wiring to the indoor unit ............................................................................................................... 65

Typical workflow

Connecting the electrical wiring typically consists of the following stages:

1 Making sure the power supply system complies with the electrical

specifications of the units.

2 Connecting the electrical wiring to the outdoor unit. 3 Connecting the electrical wiring to the indoor unit. 4 Connecting the main power supply.

18.1.1 Precautions when connecting the electrical wiring

DANGER: RISK OF ELECTROCUTION

WARNING

ALWAYS use multicore cable for power supply cables.

INFORMATION

Also read the precautions and requirements in the "2 General safety

precautions"[45].

INFORMATION

Also read "18.1.3Specifications of standard wiring components"[464].

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.

Installer and user reference guide

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VRV system air conditioner

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18 | Electrical installation

b a

c b

AA´

A´