Daikin RXYSQ6TMYFK Operation manuals

Installation and operation

manual

VRV IV-S system air conditioner

RXYSQ6TMYFK

Installation and operation manual

VRV IV-S system air conditioner

English

1+2

A~E

a b c d e e

HBHDH

(mm)

B — ≥100 A, B, C — ≥100 ≥100 ≥100 B, E — ≥100 ≥1000 ≤500 A, B, C, E — ≥150 ≥150 ≥150 ≥1000 ≤500 D — ≥500 D, E — ≥1000 ≥1000 ≤500 B, D — ≥100 ≥1000 B, D, E HB<HDHB≤½H

≥250 ≥1000 ≥1000 ≤500

½HU<HB≤H

≥250 ≥1250 ≥1000 ≤500

HB>H

HB>HDHD≤½H

≥100 ≥1000 ≥1000 ≤500

½HU<HD≤H

≥200 ≥1000 ≥1000 ≤500

HD>H

≥200 ≥1700 ≥1000 ≤500

≥100

A, B, C — ≥200 ≥300 ≥1000 A, B, C, E — ≥200 ≥300 ≥1000 ≥1000 ≤500 D — ≥1000 D, E — ≥1000 ≥1000 ≤500 B, D HD>H

≥300 ≥1000

HD≤½H

≥250 ≥1500

½HU<HD≤H

≥300 ≥1500

B, D, E HB<HDHB≤½H

≥300 ≥1000 ≥1000 ≤500

½HU<HB≤H

≥300 ≥1250 ≥1000 ≤500

HB>H

HB>HDHD≤½H

≥250 ≥1500 ≥1000 ≤500

½HU<HD≤H

≥300 ≥1500 ≥1000 ≤500

HD>H

≥300 ≥2200 ≥1000 ≤500

b (mm)

HB≤½H

b≥250

½HU<HB≤H

b≥300

HB>H

HBH

≥1000

≥200

≥2000

≥100

≥3000

≥600

≥1500

≥100

≥1000

≥300

≥100

≥300

≥100

≥1000

Table of contents

1 About the documentation 4

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

For the installer 4

2 About the box 4

2.1 Outdoor unit............................................................................... 4

2.1.1 To remove the accessories from the outdoor unit....... 4

2.1.2 To remove the transportation stay .............................. 4

3 About the units and options 4

3.1 About the outdoor unit ............................................................... 4

3.2 System layout............................................................................ 5

4 Preparation 5

4.1 Preparing the installation site .................................................... 5

4.1.1 Installation site requirements of the outdoor unit ........ 5

4.1.2 Additional installation site requirements of the

outdoor unit in cold climates ....................................... 5

4.2 Preparing refrigerant piping....................................................... 5

4.2.1 Refrigerant piping requirements.................................. 5

4.2.2 Refrigerant piping material.......................................... 5

4.2.3 To select the piping size ............................................. 6

4.2.4 To select refrigerant branch kits.................................. 6

4.3 Preparing electrical wiring ......................................................... 7

4.3.1 Safety device requirements ........................................ 7

5 Installation 7

5.1 Opening the units ...................................................................... 7

5.1.1 To open the outdoor unit............................................. 7

5.2 Mounting the outdoor unit.......................................................... 7

5.2.1 To provide the installation structure............................ 7

5.2.2 To install the outdoor unit............................................ 7

5.2.3 To provide drainage.................................................... 7

5.2.4 To prevent the outdoor unit from falling over .............. 8

5.3 Connecting the refrigerant piping .............................................. 8

5.3.1 Using the stop valve and service port......................... 8

5.3.2 To remove the pinched pipes...................................... 9

5.3.3 To connect the refrigerant piping to the outdoor unit .. 9

5.4 Checking the refrigerant piping ................................................. 10

5.4.1 About checking the refrigerant piping ......................... 10

5.4.2 Checking refrigerant piping: General guidelines......... 11

5.4.3 Checking refrigerant piping: Setup.............................. 11

5.4.4 To perform a leak test ................................................. 11

5.4.5 To perform vacuum drying .......................................... 11

5.5 To insulate the refrigerant piping............................................... 11

5.6 Charging refrigerant .................................................................. 12

5.6.1 Precautions when charging refrigerant ....................... 12

5.6.2 To determine the additional refrigerant amount.......... 12

5.6.3 To charge refrigerant .................................................. 12

5.6.4 Error codes when charging refrigerant........................ 13

5.6.5 To fix the fluorinated greenhouse gases label ............ 13

5.7 Connecting the electrical wiring................................................. 14

5.7.1 Field wiring: Overview................................................. 14

5.7.2 Guidelines when knocking out knockout holes ........... 14

5.7.3 Guidelines when connecting the electrical wiring ....... 14

5.7.4 To connect the electrical wiring on the outdoor unit.... 14

5.8 Finishing the outdoor unit installation ........................................ 15

5.8.1 To finish the transmission wiring................................. 15

6 Configuration 15

6.1 Making field settings.................................................................. 15

6.1.1 About making field settings......................................... 15

6.1.2 To access the field setting components...................... 16

6.1.3 Field setting components............................................ 16

6.1.4 To access mode 1 or 2 ................................................ 16

6.1.5 To use mode 1 ............................................................. 17

6.1.6 To use mode 2 ............................................................. 17

6.1.7 Mode 1 (and default situation): Monitoring settings ..... 17

6.1.8 Mode 2: Field settings.................................................. 18

6.1.9 To connect the PC configurator to the outdoor unit ..... 20

7 Commissioning 20

7.1 Precautions when commissioning .............................................. 20

7.2 Checklist before commissioning................................................. 20

7.3 Checklist during commissioning ................................................. 21

7.3.1 About the test run......................................................... 21

7.3.2 To perform a test run (7-segments display) ................. 21

7.3.3 Correcting after abnormal completion of the test run... 21

7.3.4 Operating the unit ........................................................ 21

8 Troubleshooting 21

8.1 Solving problems based on error codes..................................... 21

8.1.1 Error codes: Overview ................................................. 22

9 Technical data 23

9.1 Overview: Technical data ........................................................... 23

9.2 Dimensions: Outdoor unit........................................................... 24

9.3 Service space: Outdoor unit ....................................................... 25

9.4 Piping diagram: Outdoor unit...................................................... 26

9.5 Wiring diagram: Outdoor unit ..................................................... 27

9.6 Technical specifications: Outdoor unit........................................ 28

9.7 Capacity table: Indoor unit.......................................................... 30

For the user 31

10 About the system 31

10.1 System layout ............................................................................. 31

11 User interface 31

12 Operation 31

12.1 Operation range ......................................................................... 31

12.2 Operating the system ................................................................. 31

12.2.1 About operating the system ......................................... 31

12.2.2 About cooling, heating, fan only, and automatic

operation ...................................................................... 31

12.2.3 About the heating operation ......................................... 31

12.2.4 To operate the system ................................................. 32

12.3 Using the dry program ................................................................ 32

12.3.1 About the dry program ................................................. 32

12.3.2 To use the dry program................................................ 32

12.4 Adjusting the air flow direction.................................................... 32

12.4.1 About the air flow flap .................................................. 32

12.5 Setting the master user interface ............................................... 32

12.5.1 About setting the master user interface ....................... 32

12.5.2 To designate the master user interface (VRV DX)....... 33

12.5.3 To designate the master user interface (RA DX) ......... 33

13 Maintenance and service 33

13.1 About the refrigerant................................................................... 33

13.2 After-sales service and warranty ................................................ 33

13.2.1 Warranty period ........................................................... 33

13.2.2 Recommended maintenance and inspection ............... 33

14 Troubleshooting 34

14.1 Error codes: Overview ................................................................ 34

14.2 Symptoms that are NOT system malfunctions ........................... 35

14.2.1 Symptom: The system does not operate ..................... 35

14.2.2 Symptom: Fan operation is possible, but cooling and

heating do not work...................................................... 35

14.2.3 Symptom: The fan strength does not correspond to

the setting .................................................................... 35

14.2.4 Symptom: The fan direction does not correspond to

the setting .................................................................... 35

RXYSQ6TMYFK VRV IV-S system air conditioner 4P524881-1 – 2018.02

Installation and operation manual

1 About the documentation

3 (12.3 N·m)3 (12.3 N·m)

14.2.5 Symptom: White mist comes out of a unit (Indoor

unit) ............................................................................. 35

14.2.6 Symptom: White mist comes out of a unit (Indoor

unit, outdoor unit) ........................................................ 35

14.2.7 Symptom: The user interface display reads "U4" or "U5" and stops, but then restarts after a few minutes. 36

14.2.8 Symptom: Noise of air conditioners (Indoor unit) ........ 36

14.2.9 Symptom: Noise of air conditioners (Indoor unit,

outdoor unit)................................................................ 36

14.2.10 Symptom: Noise of air conditioners (Outdoor unit) ..... 36

14.2.11 Symptom: Dust comes out of the unit ......................... 36

14.2.12 Symptom: The units can give off odours..................... 36

14.2.13 Symptom: The outdoor unit fan does not spin ............ 36

14.2.14 Symptom: The display shows "88".............................. 36

14.2.15 Symptom: The compressor in the outdoor unit does

not stop after a short heating operation ...................... 36

14.2.16 Symptom: The inside of an outdoor unit is warm

even when the unit has stopped ................................. 36

14.2.17 Symptom: Hot air can be felt when the indoor unit is

stopped ....................................................................... 36

15 Relocation 36

16 Disposal 36

1 About the documentation

1.1 About this document

INFORMATION

Make sure that the user has the printed documentation and ask him/her to keep it for future reference.

Target audience

Authorised installers + end users

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.

Documentation set

This document is part of a documentation set. The complete set consists of:

▪ General safety precautions:

▪ Safety instructions that you must read before installing

▪ Format: Paper (in the box of the outdoor unit)

▪ Outdoor unit installation and operation manual:

▪ Installation and operation instructions

▪ Format: Paper (in the box of the outdoor unit)

▪ Installer and user reference guide:

▪ Preparation of the installation, 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

▪ 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

extranet (authentication required).

For the installer

2 About the box

2.1 Outdoor unit

2.1.1 To remove the accessories from the outdoor unit

1 Remove the service cover. See "5.1.1 To open the outdoor

unit"on page7.

2 Remove the accessories.

2.1.2 To remove the transportation stay

NOTICE

If the unit is operated with the transportation stay attached, abnormal vibration or noise may be generated.

3 About the units and options

3.1 About the outdoor unit

This installation manual concerns the VRV IV-S, full inverter driven, heat pump system.

This unit is intended for outdoor installation and aimed for air to air heat pump applications.

Installation and operation manual

VRV IV-S system air conditioner

RXYSQ6TMYFK

4P524881-1 – 2018.02

4 Preparation

d d

c cb

(°C WB)

a b

15.5 15

–5

–10

–15

–20

10 15 20 25

(°C DB)

Specification RXYSQ6

Capacity Heating 12.3kW

Cooling 12.8~15.1kW

Ambient design temperature

Heating –20~15.5°CWB

Cooling –5~52°CDB

3.2 System layout

NOTICE

Design of the system must not be done at temperatures below –15°C.

a VRV IV-S Heat pump outdoor unit b Refrigerant piping c VRV direct expansion (DX) indoor unit d User interface (dedicated depending on indoor unit type)

4.1.2 Additional installation site requirements of the outdoor unit in cold climates

NOTICE

When operating the unit in heating in a low outdoor ambient temperature with high humidity conditions, make sure to take precautions to keep the drain holes of the unit free by using proper equipment.

In heating:

4 Preparation

4.1 Preparing the installation site

4.1.1 Installation site requirements of the outdoor unit

Mind the spacing guidelines. See the "Technical data" chapter, and the figures on the inside of the front cover.

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.

NOTICE

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

a Warming up operation range

b Operation range

TAI Ambient indoor temperature

TAO Ambient outdoor temperature

If the unit is selected to operate at ambient temperatures lower than –5°C for 5 days or longer, with relative humidity levels exceeding 95%, we recommend to apply a Daikin range specifically designed for such application and/or to contact your dealer for further advice.

4.2 Preparing refrigerant piping

4.2.1 Refrigerant piping requirements

NOTICE

Refrigerant R410A requires strict cautions for keeping the system clean and dry. Foreign materials (including mineral oils or moisture) should be prevented from getting mixed into the system.

NOTICE

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

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

be ≤30mg/10m.

4.2.2 Refrigerant piping material

▪ Piping material: Phosphoric acid deoxidised seamless copper.

▪ Piping temper grade and thickness:

RXYSQ6TMYFK VRV IV-S system air conditioner 4P524881-1 – 2018.02

Installation and operation manual

4 Preparation

B-1 B-2

C-1 C-2 C-3 C-4

3-1 3-2 3-3 3-4

VRV DX

2 2

Outer diameter

Temper grade Thickness (t)

(a)

(Ø)

6.4mm (1/4")

Annealed (O) ≥0.80mm

9.5mm (3/8")

12.7mm (1/2")

15.9mm (5/8") Annealed (O) ≥0.99mm

19.1mm (3/4")

Half hard (1/2H) ≥0.80mm

22.2mm (7/8")

25.4mm (1") Half hard (1/2H) ≥0.88mm

28.6mm (1‑1/8") Half hard (1/2H) ≥0.99mm

(a) Depending on the applicable legislation and the unit's

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

4.2.3 To select the piping size

Determine the proper size using the following tables and reference figure (only for indication).

INFORMATION

Combination of RA DX and aircurtain indoor units is not allowed.

a Outdoor unit b Main pipes c Increase d First refrigerant branch kit e Indoor unit

Outdoor unit

capacity type (HP)

Piping outer diameter size (mm)

Gas pipe Liquid pipe

Standard Size-up Standard Size-up

6 22.2 25.4

(a) If size is NOT available, increase is NOT allowed.

(a)

9.5 12.7

B: Piping between refrigerant branch kits

Choose from the following table in accordance with the indoor unit total capacity type, connected downstream. Do not let the connection piping exceed the refrigerant piping size chosen by the general system model name.

Indoor unit capacity

index

<150 15.9 9.5

150≤x<200 19.1

Piping outer diameter size (mm)

Gas pipe Liquid pipe

1 Outdoor unit 2 Refrigerant branch kits

3-1~3-4 VRVDX indoor units

A Piping between outdoor unit and (first) refrigerant branch

B-1 B-2 Piping between refrigerant branch kits

C-1~C-4 Piping between refrigerant branch kit and indoor unit

In case the required pipe sizes (inch sizes) are not available, it is also allowed to use other diameters (mm sizes), taken the following into account:

▪ Select the pipe size nearest to the required size.

▪ Use the suitable adapters for the change-over from inch to mm

pipes (field supply).

▪ The additional refrigerant calculation has to be adjusted as

mentioned in "5.6.2 To determine the additional refrigerant

amount"on page12.

A: Piping between outdoor unit and (first) refrigerant branch kit or between outdoor unit and indoor unit

When the equivalent pipe length between outdoor and indoor units is 90m or more, the size of the main pipes (both gas side and liquid side) must be increased. Depending on the length of the piping, the capacity may drop, but even in such a case the size of the main pipes has to be increased. More specifications can be found in the technical engineering data book.

Installation and operation manual

Example: Downstream capacity for B-1 = capacity index of unit 3-1 + capacity index of unit 3-2

C: Piping between refrigerant branch kit and indoor unit

Use the same diameters as the connections (liquid, gas) on the indoor units. The diameters of the indoor units are as follows:

Indoor unit capacity

index

Piping outer diameter size (mm)

Gas pipe Liquid pipe

15~50 12.7 6.4

kit

63~160 15.9 9.5

4.2.4 To select refrigerant branch kits

For piping example, refer to "4.2.3 To select the piping size" on

page6.

Refnet joint at first branch (counting from outdoor unit)

When using refnet joints at the first branch counted from the outdoor unit side, choose from the following table in accordance with the capacity of the outdoor unit. Example: Refnet joint A→B‑1.

Outdoor unit capacity type

(HP)

6 KHRQ22M29T9

Refnet joints at other branches

For refnet joints other than the first branch, select the proper branch kit model based on the total capacity index of all indoor units connected after the refrigerant branch. Example: Refnet joint B‑1→C‑1.

Indoor unit capacity index Refrigerant branch kit

x<200 KHRQ22M20T

Refnet headers

Concerning refnet headers, choose from the following table in accordance with the total capacity of all the indoor units connected below the refnet header.

Refrigerant branch kit

RXYSQ6TMYFK

VRV IV-S system air conditioner

4P524881-1 – 2018.02

5 Installation

3×

(mm)

>150

620

(485-495)

490

4× M12

Indoor unit capacity index Refrigerant branch kit

x<200 KHRQ22M29H

INFORMATION

Maximum 8 branches can be connected to a header.

4.3 Preparing electrical wiring

4.3.1 Safety device requirements

The power supply must be protected with the required safety devices, i.e. a main switch, a slow blow fuse on each phase and an earth leakage protector in accordance with the applicable legislation.

Selection and sizing of the wiring should be done in accordance with the applicable legislation based on the information mentioned in the table below.

Model Minimum

circuit

ampacity

RXYSQ6 22A 25A 3N~50 / 60Hz

Transmission wiring

Transmission wiring Vinyl cords with 0.75 to

Maximum wiring length

(= distance between outdoor and furthest indoor unit)

Total wiring length

(= distance between outdoor and all indoors)

If the total transmission wiring exceeds these limits, it may result in communication error.

Recommended

fuses

1.25mm² sheath or cables

Power supply

380-415 / 400V

(2‑core wires)

300m

600m

5.2 Mounting the outdoor unit

5.2.1 To provide the installation structure

Prepare 4 sets of anchor bolts, nuts and washers (field supply) as follows:

a Make sure not to cover the drain holes.

5.2.2 To install the outdoor unit

5 Installation

5.1 Opening the units

5.1.1 To open the outdoor unit

DANGER: RISK OF ELECTROCUTION

DANGER: RISK OF BURNING

5.2.3 To provide drainage

▪ Make sure that condensation water can be evacuated properly.

▪ Install the unit on a base to make sure that there is proper

drainage in order to avoid ice accumulation.

▪ Prepare a water drainage channel around the foundation to drain

waste water away from the unit.

▪ Avoid drain water flowing over the footpath, so that it does NOT

become slippery in case of ambient freezing temperatures.

▪ If you install the unit on a frame, install a waterproof plate within

150 mm of the bottom side of the unit in order to prevent water from getting into the unit and to avoid drain water dripping (see the following figure).

RXYSQ6TMYFK VRV IV-S system air conditioner 4P524881-1 – 2018.02

Installation and operation manual

5 Installation

≥150 mm

102

118

216

130

NOTICE

If drain holes of the outdoor unit are covered by a mounting base or by floor surface, raise the unit to provide a free space of more than 150mm under the outdoor unit.

Drain holes (dimensions in mm)

a Drain holes

5.2.4 To prevent the outdoor unit from falling over

In case the unit is installed in places where strong wind can tilt the unit, take following measure:

1 Prepare 2 cables as indicated in the following illustration (field

supply).

2 Place the 2 cables over the outdoor unit.

3 Insert a rubber sheet between the cables and the outdoor unit

to prevent the cables from scratching the paint (field supply).

4 Attach the ends of the cables and tighten them.

2 Insert a hexagon wrench into the stop valve and turn the stop

valve counterclockwise.

3 When the stop valve cannot be turned any further, stop turning.

Result: The valve is now open.

To fully open the Ø19.1 mm~Ø25.4 mm stop valve, turn the hexagonal wrench until a torque between 27 and 33 N•m is achieved.

Inadequate torque may cause leakage of refrigerant and breakage of the stop valve cap.

NOTICE

Pay attention that mentioned torque range is applicable for opening Ø19.1~Ø25.4mm stop valves only.

To close the stop valve

1 Remove the stop valve cover.

2 Insert a hexagon wrench into the stop valve and turn the stop

valve clockwise.

3 When the stop valve cannot be turned any further, stop turning.

Result: The valve is now closed.

Closing direction:

5.3 Connecting the refrigerant piping

DANGER: RISK OF BURNING

5.3.1 Using the stop valve and service port

To handle the stop valve

▪ Make sure to keep all stop valves open during operation.

▪ The stop valve is factory closed.

To open the stop valve

1 Remove the stop valve cover.

Installation and operation manual

To handle the stop valve cover

▪ The stop valve cover is sealed where indicated by the arrow. Do

NOT damage it.

▪ After handling the stop valve, tighten the stop valve cover

securely, and check for refrigerant leaks. For the tightening torque, refer to the table below.

To handle the service port

▪ Always use a charge hose equipped with a valve depressor pin,

since the service port is a Schrader type valve.

▪ After handling the service port, make sure to tighten the service

port cover securely. For the tightening torque, refer to the table below.

▪ Check for refrigerant leaks after tightening the service port cover.

RXYSQ6TMYFK

VRV IV-S system air conditioner

4P524881-1 – 2018.02

Tightening torques

p<p

R410AN2

b c e

f g

A B

4× Ø6 mm

5 Installation

Stop valve

size (mm)

Tightening torque N•m (turn clockwise to close)

Shaft

Valve body Hexagonal

wrench

Cap (valve

lid)

Service

port

Ø12.7 8.1~9.9 4mm 18.0~22.0 11.5~13.9

Ø25.4 27.0~33.0 8mm 22.5~27.5

5.3.2 To remove the pinched pipes

WARNING

Any gas or oil remaining inside the stop valve may blow off the pinched piping.

Failure to observe the instructions in procedure below properly may result in property damage or personal injury, which may be serious depending on the circumstances.

Use the following procedure to remove the pinched piping:

1 Remove the valve cover and make sure that the stop valves are

fully closed.

a Service port and service port cover b Stop valve c Field piping connection d Stop valve cover

2 Connect the vacuuming/recovery unit through a manifold to the

service port of all stop valves.

WARNING

Never remove the pinched piping by brazing.

Any gas or oil remaining inside the stop valve may blow off the pinched piping.

6 Wait until all oil is dripped out before continuing with the

connection of the field piping in case the recovery was not complete.

5.3.3 To connect the refrigerant piping to the outdoor unit

NOTICE

Be sure that the field installed piping does not touch other pipes, the bottom panel or side panel. Especially for the bottom and side connection, be sure to protect the piping with suitable insulation, to prevent it from coming into contact with the casing.

1 Do the following:

▪ Remove the service cover. See "5.1.1 To open the outdoor

unit"on page7.

▪ Remove the piping intake plate (a) with screw (b).

a Pressure reducing valve b Nitrogen c Weighing scales d Refrigerant R410A tank (siphon system) e Vacuum pump

f Liquid line stop valve

g Gas line stop valve A Valve A B Valve B

3 Recover gas and oil from the pinched piping by using a

recovery unit.

CAUTION

Do not vent gases into the atmosphere.

4 When all gas and oil is recovered from the pinched piping,

disconnect the charge hose and close the service ports

5 Cut off the lower part of the gas and liquid stop valve pipes

along the black line. Use an appropriate tool (e.g. a pipe cutter, a pair of nippers).

RXYSQ6TMYFK VRV IV-S system air conditioner 4P524881-1 – 2018.02

2 Choose a piping route (a, b, c or d).

3 If you have chosen the downwards piping route:

▪ Drill (a, 4×) and remove the knockout hole (b). ▪ Cut out the slits (c) with a metal saw.

Installation and operation manual

5 Installation

a b c

a b f g

cde

cdd1

c d d1

d d1

Refrigerant piping works are finished?

The indoor units and/or outdoor unit were already powered ON?

Use procedure: "Method 2: After power ON".

Finish piping work.

Use procedure: "Method 1: Before power ON

(regular method)".

Yes

4 Do the following:

▪ Connect the liquid pipe (a) to the liquid stop valve. (brazing) ▪ Connect the gas pipe (b) to the gas stop valve. (brazing)

NOTICE

When brazing: First braze the liquid side piping, then the

gas side piping. Enter the electrode from the front of the unit and the welding torch from the right side to braze with the flames facing outside and avoid the compressor sound insulation and other piping.

a Electrode

b Burning-resistant plate

c Welding torch

d Flames

e Compressor sound insulation

f Liquid side piping

g Gas side piping

▪ Connect the gas piping accessories (c, d), and cut them to

the required length (d1).

6 Seal all gaps (example: a) to prevent snow and small animals

from entering the system.

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.

NOTICE

Make sure to open the stop valves after installing the refrigerant piping and performing vacuum drying. Running the system with the stop valves closed may break the compressor.

5.4 Checking the refrigerant piping

5.4.1 About checking the refrigerant piping

Possibility 1: To the front

Possibility 3: To the side

5 Reattach the service cover and the piping intake plate.

Possibility 2: To the back

It is very important that all refrigerant piping work is done before the units (outdoor or indoor) are powered on.

When the units are powered on, the expansion valves will initialise. This means that they will close. Leak test and vacuum drying of field piping and indoor units is impossible when this happens.

Therefore, there will be explained 2 methods for initial installation, leak test and vacuum drying.

Method 1: Before power ON

If the system has not yet been powered on, no special action is

Possibility 4: Downwards

required to perform the leak test and the vacuum drying.

Method 2: After power ON

If the system has already been powered on, activate setting [2‑21] (refer to "6.1.4 To access mode 1 or 2" on page 16). This setting will open field expansion valves to guarantee a R410A piping pathway and make it possible to perform the leak test and the vacuum drying.

NOTICE

Make sure that all indoor units connected to the outdoor unit are powered on.

NOTICE

Wait until the outdoor unit has finished the initialisation to apply setting [2‑21].

Installation and operation manual

VRV IV-S system air conditioner

RXYSQ6TMYFK

4P524881-1 – 2018.02

5 Installation

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Leak test and vacuum drying

Checking the refrigerant piping involves:

▪ Checking for any leakages in the refrigerant piping.

▪ Performing vacuum drying to remove all moisture, air or nitrogen

in the refrigerant piping.

If there is a possibility of moisture being present in the refrigerant piping (for example, water may have entered the piping), first carry out the vacuum drying procedure below until all moisture has been removed.

All piping inside the unit has been factory tested for leaks.

Only field installed refrigerant piping needs to be checked. Therefore, make sure that all the outdoor unit stop valves are firmly closed before performing leak test or vacuum drying.

NOTICE

Make sure that all (field supplied) field piping valves are OPEN (not outdoor unit stop valves!) before you start leak test and vacuuming.

For more information on the state of the valves, refer to

"5.4.3Checking refrigerant piping: Setup"on page11.

5.4.2 Checking refrigerant piping: General guidelines

Connect the vacuum pump through a manifold to the service port of all stop valves to increase efficiency (refer to "5.4.3 Checking

refrigerant piping: Setup"on page11).

NOTICE

Use a 2-stage vacuum pump with a non-return valve or a solenoid valve that can evacuate to a gauge pressure of –⁠100.7kPa (−⁠1.007bar)(5Torr absolute).

NOTICE

Make sure the pump oil does not flow oppositely into the system while the pump is not working.

NOTICE

Do not purge the air with refrigerants. Use a vacuum pump to evacuate the installation.

5.4.3 Checking refrigerant piping: Setup

a Pressure reducing valve b Nitrogen c Weighing scales d Refrigerant R410A tank (siphon system) e Vacuum pump

f Liquid line stop valve

g Gas line stop valve A Valve A B Valve B C Valve C

Valve State of valve

Valve A Open

Valve B Open

Valve C Open

Liquid line stop valve Close

Gas line stop valve Close

RXYSQ6TMYFK VRV IV-S system air conditioner 4P524881-1 – 2018.02

NOTICE

The connections to the indoor units and all indoor units should also be leak and vacuum tested. Keep any possible (field supplied) field piping valves open as well.

Refer to the indoor unit installation manual for more details. Leak test and vacuum drying should be done before the power supply is set to the unit. If not, see also the flow chart earlier described in this chapter (see "5.4.1 About

checking the refrigerant piping"on page10).

5.4.4 To perform a leak test

The leak test must satisfy the specifications of EN378‑2.

To check for leaks: Vacuum leak test

1 Evacuate the system from the liquid and gas piping to

–⁠100.7kPa (–⁠1.007bar)(5Torr absolute) for more than 2 hours.

2 Once reached, turn off the vacuum pump and check that the

pressure does not rise for at least 1 minute.

3 Should the pressure rise, the system may either contain

moisture (see vacuum drying below) or have leaks.

To check for leaks: Pressure leak test

1 Break the vacuum by pressurising with nitrogen gas to a

minimum gauge pressure of 0.2 MPa (2 bar). Never set the gauge pressure higher than the maximum operation pressure of the unit, i.e. 4.0MPa (40bar).

2 Test for leaks by applying a bubble test solution to all piping

connections.

3 Discharge all nitrogen gas.

NOTICE

Make sure to use a recommended bubble test solution from your wholesaler. Do not use soap water, which may cause cracking of flare nuts (soap water may contain salt, which absorbs moisture that will freeze when the piping gets cold), and/or lead to corrosion of flared joints (soap water may contain ammonia which causes a corrosive effect between the brass flare nut and the copper flare).

5.4.5 To perform vacuum drying

To remove all moisture from the system, proceed as follows:

1 Evacuate the system for at least 2 hours to a target vacuum of

–⁠100.7kPa (–⁠1.007bar)(5Torr absolute).

2 Check that, with the vacuum pump turned off, the target

vacuum is maintained for at least 1 hour.

3 Should you fail to reach the target vacuum within 2 hours or

maintain the vacuum for 1 hour, the system may contain too much moisture. In that case, break the vacuum by pressurising with nitrogen gas to a gauge pressure of 0.05 MPa (0.5bar) and repeat steps 1 to 3 until all moisture has been removed.

4 Depending on whether you want to immediately charge

refrigerant through the refrigerant charge port or first pre-charge a portion of refrigerant through the liquid line, either open the outdoor unit stop valves, or keep them closed. See "5.6.3 To

charge refrigerant"on page12 for more information.

5.5 To insulate the refrigerant piping

After finishing the leak test and vacuum drying, the piping must be insulated. Take into account the following points:

▪ Make sure to insulate the connection piping and refrigerant branch

kits entirely.

▪ Be sure to insulate the liquid and gas piping (for all units).

Installation and operation manual

5 Installation

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▪ Use heat resistant polyethylene foam which can withstand a

temperature of 70°C for liquid piping and polyethylene foam which can withstand a temperature of 120°C for gas piping.

▪ Reinforce the insulation on the refrigerant piping according to the

installation environment.

Ambient

Humidity Minimum thickness

temperature

≤30°C 75% to 80% RH 15mm

>30°C ≥80% RH 20mm

Condensation might form on the surface of the insulation.

▪ If there is a possibility that condensation on the stop valve might

drip down into the indoor unit through gaps in the insulation and piping because the outdoor unit is located higher than the indoor unit, this must be prevented by sealing up the connections. See below figure.

a Insulation material

b Caulking etc.

5.6 Charging refrigerant

NOTICE

Close the front panel before any refrigerant charge operation is executed. Without the front panel attached the unit cannot judge correctly whether it is operating properly or not.

NOTICE

In case of maintenance and the system (outdoor unit+field piping+indoor units) does not contain any refrigerant any more (e.g., after refrigerant reclaim operation), the unit has to be charged with its original amount of refrigerant (refer to the nameplate on the unit) and the determined additional refrigerant amount.

5.6.2 To determine the additional refrigerant amount

INFORMATION

For final charge adjustment in a test laboratory, contact your dealer.

Formula:

R=[(X1×Ø15.9)×0.18+(X2×Ø12.7)×0.12+(X3×Ø9.5)×0.059+ (X4×Ø6.4)×0.022]

R Additional refrigerant to be charged [in kg and rounded off

to 1 decimal place]

Total length [m] of liquid piping size at Øa

1...4

Metric piping. When using metric piping, replace the weight factors

in the formula by the ones from the following table:

5.6.1 Precautions when charging refrigerant

Installation and operation manual

WARNING

▪ Only use R410A as refrigerant. Other substances may

cause explosions and accidents.

▪ R410A contains fluorinated greenhouse gases. Its

global warming potential (GWP) value is 2087.5. Do NOT vent these gases into the atmosphere.

▪ When charging refrigerant, always use protective

gloves and safety glasses.

NOTICE

If the power of some units is turned off, the charging procedure cannot be finished properly.

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.

NOTICE

If operation is performed within 12 minutes after the indoor and outdoor units are turned on, the compressor will not operate before the communication is established in a correct way between outdoor unit(s) and indoor units.

NOTICE

Before starting charging procedures, check if the 7‑segment display indication of the compressor unit A1P PCB is as normal (see "6.1.4 To access mode 1 or 2" on

page 16). If a malfunction code is present, see "8.1Solving problems based on error codes"on page21.

NOTICE

Make sure all connected indoor units are recognised (setting [1‑10]).

Inch piping Metric piping

Piping Weight factor Piping Weight factor

Ø6.4mm 0.022 Ø6mm 0.018

Ø9.5mm 0.059 Ø10mm 0.065

Ø12.7mm 0.12 Ø12mm 0.097

Ø15.9mm 0.18 Ø15mm 0.16

5.6.3 To charge refrigerant

To speed up the refrigerant charging process, it is in case of larger systems recommended to first pre-charge a portion of refrigerant through the liquid line before proceeding with the manual charging. It can be skipped, but charging will take longer then.

Pre-charging refrigerant

Pre-charging can be done without compressor operation, by connecting the refrigerant bottle to the service port of the liquid stop valve.

1 Connect as shown. Make sure that all outdoor unit stop valves,

as well as valve A are closed.

a Pressure reducing valve b Nitrogen c Weighing scales d Refrigerant R410A tank (siphon system) e Vacuum pump

f Liquid line stop valve

g Gas line stop valve A Valve A B Valve B C Valve C

2 Open valves C and B.

RXYSQ6TMYFK

VRV IV-S system air conditioner

4P524881-1 – 2018.02

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