INSTALLATION MANUAL

URBAN MULTI AIR CONDITIONER

U-5MX4XPQ

U-8MX4XPQ

U-10MX4XPQ

U-12MX4XPQ

U-14MX4XPQ

U-16MX4XPQ

U-18MX4XPQ

Installation manual

Urban Multi air conditioner

Installationsanleitung

Urban Multi Klimaanlage

Manuel d'installation

Climatiseur Urban Multi

Montagehandleiding

Urban Multi airconditioner

Manual de instalación

Acondicionador de aire Urban Multi

Manuale d'installazione

Climatizzatore Urban Multi

∂Á¯ÂÈÚ›‰ÈÔ ÂÁηٿÛÙ·Û˘

∫ÏÈÌ·ÙÈÛÙÈÎfi Urban Multi

Manual de instalação

Ar condicionado Urban Multi

English

Deutsch

Français

Nederlands

Español

Italiano

EÏÏËÓÈο

Portugues

A

1

8

4

8

4

A

1

8

4

1 b

A

a d

1

B

D

c

C A

a

1

4

3

1

1

2

3

4

A+B+C+D

a ≥ 10 mm b ≥ 300 mm c ≥ 10 mm d ≥ 500 mm a ≥ 10 mm b ≥ 300 mm c ≥ 10 mm d ≥ 500 mm e ≥ 20 mm a ≥ 10 mm b ≥ 300 mm c ≥ 10 mm d ≥ 500 mm e ≥ 20 mm f ≥ 600 mm a ≥ 10 mm b ≥ 300 mm c ≥ 10 mm d ≥ 300 mm e ≥ 20 mm f ≥ 500 mm a ≥ 50 mm b ≥ 100 mm c ≥ 50 mm d ≥ 500 mm a ≥ 50 mm b ≥ 100 mm c ≥ 50 mm d ≥ 500 mm e ≥ 100 mm a ≥ 50 mm b ≥ 100 mm c ≥ 50 mm d ≥ 500 mm e ≥ 100 mm f ≥ 500 mm a ≥ 50 mm b ≥ 100 mm c ≥ 50 mm d ≥ 100 mm e ≥ 100 mm f ≥ 500 mm

3

5 1

e b

2

B

d

D

e

A+B

a ≥ 200 mm b ≥ 300 mm a ≥ 200 mm b ≥ 300 mm e ≥ 400 mm

h

2 c

C A

a

3

5

A

a h

1

2 2 4 3

U-5~18MX4

B

2

3

1

8

6

8

5

5

9

3

2

8

7

8

11

10

8

6

1

2

6

8 9

U-20~54MX4

B

2

3

1

8

6

8

5

3

2

8

7

8

11

1

3

B

b e f

D

d

4

B

b e f

D

d

1

3

4

5

4

5

c

C

c

C

3

5

2

10

8

1 2 4 5 6

1

3

3

2

7

5

7

2

3

2

1

1500

≥

100

6

4

5

≥

1000

≥

1000

≥

1500

≥

1500

≥

1500

A

B

5

3

U-Q5~12MX4 U-14~18MX4

3

2

(mm)

≥

100

12

9

9

1

4

5

6

6

1 3 2 5 4

2

3

4

5

4

3 7

10 11 12

13

17

14

1 2 max

15

°

A

1

1

A

13

15

1

B

2

18

15

3

23

7 8

6

5

18

23

B

2

2

4

1

1

2

3

4

1

6

5

3

4

6

6

1

B

3

5

6

5

14

16

1

A B

1

4 3

1

2

2

8

2

2

2

2

6

7

3

4

5

7

16

>12

0 mm

>500

mm

1

19

21

19

1

2

3

4

A B C

1 3

4

5

A1P

A B C F

1

F

2

F

1

F

2

Q

1

Q

2

7

F1 F2

A B C F1 F2 F1 F2 Q1 Q2

C/H SELECTOR

TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT

2 6

F1 F2 F1 F2

F1 F2 F1 F2 F1 F2

17

20

1

A1P

A B C F1 F2 F1 F2 Q1 Q2

2

Q1 Q2

L 1 L 2 L 3 N

5

6

7

7 5 6

20

4 4

22

TO IN/D

UNIT

F1 F2

ON

OFF

O

U

T

1 2 3 4

I

N

DS1

8

9

3

Q1 Q2

F1 F2 F1 F2 F1 F2

10

11

1

24

21

U-5~12MX4 U-14~18MX4

22

25

1

1

A B C

ON

OFF

O

U

T

1 2 3 4

I

N

DS1

2 2

24 25

A B C

1

U-5~18MX4XPQ

Urban Multi air conditioner

Installation manual

C

ONTENTS

Page

1. Introduction................................................................................ 1

1.1. Combination................................................................................. 1

1.2. Standard supplied accessories.................................................... 2

1.3. Optional accessories ................................................................... 2

1.4. Technical and Electrical specifications......................................... 2

2. Main components ...................................................................... 2

3. Selection of location .................................................................. 3

4. Inspecting and handling the unit................................................ 4

5. Unpacking and placing the unit ................................................. 4

6. Refrigerant piping ...................................................................... 4

6.1. Installation tools ........................................................................... 5

6.2. Selection of piping material.......................................................... 5

6.3. Pipe connection ........................................................................... 5

6.4. Connecting the refrigerant piping................................................. 5

6.5. Protection against contamination when installing pipes .............. 7

6.6. Example of connection ................................................................ 8

7. Leak test and vacuum drying................................................... 10

8. Field wiring .............................................................................. 10

8.1. Internal wiring – Parts table ....................................................... 11

8.2. Optional parts cool/heat selector ............................................... 11

8.3. Power circuit and cable requirements ........................................ 12

8.4. General cautions........................................................................ 12

8.5. System examples....................................................................... 13

8.6. Leading power line and transmission line .................................. 13

8.7. Field line connection: transmission wiring and cool/heat selection .............................................................. 13

8.8. Field line connection: power wiring ............................................ 14

8.9. Wiring example for wiring inside unit ......................................... 15

9. Pipe insulation ......................................................................... 15

10. Checking of unit and installation conditions............................. 15

11. Charging refrigerant................................................................. 16

11.1. Precautions when adding R410A .............................................. 16

11.2. Stop valve operation procedure ................................................. 16

11.3. How to check how many units are connected............................ 16

11.4. Additional refrigerant charge...................................................... 17

11.5. Checks after adding refrigerant.................................................. 22

12. Before operation ...................................................................... 22

12.1. Service precautions ................................................................... 22

12.2. Checks before initial start-up ..................................................... 23

12.3. Field setting ............................................................................... 23

12.4. Test operation ............................................................................ 25

13. Service mode operation........................................................... 27

14. Caution for refrigerant leaks .................................................... 27

15. Disposal requirements............................................................. 28

READ THIS MANUAL ATTENTIVELY BEFORE STARTING

UP THE UNIT. DO NOT THROW IT AWAY. KEEP IT IN

YOUR FILES FOR FUTURE REFERENCE.

IMPROPER INSTALLATION OR ATTACHMENT OF

EQUIPMENT OR ACCESSORIES COULD RESULT IN

ELECTRIC SHOCK, SHORT-CIRCUIT, LEAKS, FIRE OR

OTHER DAMAGE TO THE EQUIPMENT. BE SURE ONLY

TO USE ACCESSORIES MADE BY PANASONIC WHICH

ARE SPECIFICALLY DESIGNED FOR USE WITH THE

EQUIPMENT AND HAVE THEM INSTALLED BY A

PROFESSIONAL.

PANASONIC EQUIPMENT IS DESIGNED FOR

COMFORT APPLICATIONS. FOR USE IN OTHER

APPLICATIONS, PLEASE CONTACT YOUR LOCAL

PANASONIC DEALER.

IF UNSURE OF INSTALLATION PROCEDURES OR USE,

ALWAYS CONTACT YOUR DEALER FOR ADVICE AND

INFORMATION.

THIS AIR CONDITIONER COMES UNDER THE TERM

"APPLIANCES NOT ACCESSIBLE TO THE GENERAL

PUBLIC".

Installation manual

1

The refrigerant charge of the system must be less than

100 kg. This means that in case the calculated refrigerant charge is equal to or more than 95 kg you must divide your multiple outdoor system into smaller independent systems, each containing less than 95 kg refrigerant charge.

For factory charge, refer to the unit name plate.

The refrigerant R410A requires strict cautions for keeping the system clean, dry and tight.

■

Clean and dry

Foreign materials (including mineral oils such as

SUNISO oil or moisture) should be prevented from getting mixed into the system.

■

Tight

R410A does not contain any chlorine, does not destroy the ozone layer, and does not reduce the earth's protection against harmful ultraviolet radiation.

R410A can contribute slightly to the greenhouse effect if it is released. Therefore we should take special attention to check the tightness of the installation.

Read "6. Refrigerant piping" on page 4 carefully and follow these procedures correctly.

Since design pressure is 4.0 MPa or 40 bar (for R407C units: 3.3 MPa or 33 bar), pipes of larger wall thickness may be required. The wall thickness of piping must be carefully selected, refer to paragraph "6.2. Selection of piping material" on page 5 for more details.

1.

I

NTRODUCTION

This installation manual concerns Urban Multi units of the Panasonic

U-MX4XPQ series. These units are designed for outdoor installation and used for cooling and heat pump applications. The U-MX4XPQ series can be combined from 7 main units and has nominal cooling capacities ranging from 16.0 to 170 kW.

The U-MX4XPQ units can be combined with Panasonic Urban Multi indoor units for air conditioning purposes, and suitable for R410A.

The present installation manual describes the procedures for unpacking, installing and connecting the U-MX4XPQ units.

Installation of the indoor units is not described in this manual. Always refer to the installation manual supplied with these units for their installation.

1.1.

Combination

The indoor units can be installed in the following range.

■

Always use appropriate indoor units compatible with R410A.

To learn which models of indoor units are compatible with

R410A, refer to the product catalogs.

■

Pay attention when connecting outdoor units in multi combination. U-MX3XPQ(A) units are NOT compatible with

U-MX4XPQ units.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

■

Total capacity/quantity of indoor units

Standard combination of outdoor units

U-5MX4

(a)

U-8MX4 (a)

U-10MX4 (a)

U-12MX4 (a)

U-14MX4 (a)

U-16MX4 (a)

U-18MX4 (a)

U-20MX4 = U-8MX4 + U-12MX4

U-22MX4

U-24MX4

U-26MX4

U-28MX4

U-30MX4

U-32MX4

U-34MX4

U-36MX4

= U-10MX4 + U-12MX4

= U-12MX4 + U-12MX4

= U-8MX4 + U-18MX4

= U-10MX4 + U-18MX4

= U-12MX4 + U-18MX4

= U-14MX4 + U-18MX4

= U-16MX4 + U-18MX4

= U-18MX4 + U-18MX4

U-38MX4

U-40MX4

U-42MX4

U-44MX4

U-46MX4

U-48MX4

U-50MX4

U-52MX4

= U-18MX4 + U-12MX4 + U-12MX4

= U-10MX4 + U-12MX4 + U-12MX4

= U-12MX4 + U-12MX4 + U-12MX4

= U-8MX4 + U-18MX4 + U-18MX4

= U-10MX4 + U-18MX4 + U-18MX4

= U-12MX4 + U-18MX4 + U-18MX4

= U-14MX4 + U-18MX4 + U-18MX4

= U-16MX4 + U-18MX4 + U-18MX4

U-54MX4 = U-18MX4 + U-18MX4 + U-18MX4

(a) = main unit

Total capacity of indoor units

(kW)

Total quantity of indoor units

62.5~250 12

100~400

125~500

150~600

175~700

200~800

225~900

250~800

275~880

300~960

325~1040

350~1120

375~1200

400~1280

425~1360

450~1440

475~1235

500~1300

525~1365

550~1430

575~1495

600~1560

625~1625

650~1690

675~1755

60

64

64

64

44

48

52

56

35

40

45

40

20

25

30

64

64

64

64

64

61

64

64

64

NOTE

■

■

■

The table above shows the possible total capacity and number of possible indoor units when configured in a standard combination.

Refer to the service manual for more details when using a configuration other than a standard combination.

If the total capacity of the connected indoor units exceeds the capacity of the outdoor unit, cooling and heating performance may drop when running the indoor units.

Refer to the section on performance characteristics in the Engineering Data Book for details.

There are restrictions on the refrigerant pipe connection order between outdoor units during installation in case of a multiple outdoor unit system.

Install according to the following restrictions.

The capacities of outdoor units A, B, and C must fulfill the following restriction conditions:

A

≥

B

≥

C

.

A B C

1.2.

Standard supplied accessories

accessories are supplied with the unit.

Installation manual

Operation manual

Additional refrigerant charge label

1

1

1 accessories are supplied with the unit.

Unit type

5~18 Hp

Gas side accessory pipe

Item

5~10 Hp

12~18 Hp

Liquid side accessory pipe

Item Unit type

5~18 Hp

5~10, 14, 16 Hp

12, 18 Hp

1.3.

Optional accessories

To install the above outdoor units, the following optional parts are also required.

■

Refrigerant branching kit (for R410A only: Always use an appropriate kit dedicated for your system.)

■

■

Refnet header

CZ-P29HK12Q

CZ-P64HK12Q

CZ-P75HK12Q

Refnet joint

CZ-P20BK12Q

CZ-P29BK12Q

CZ-P64BK12Q

CZ-P75BK12Q

Outdoor unit multi connection piping kit (For R410A only: Always use an appropriate kit dedicated for your system.)

Number of outdoor units connected

2

CZ-32PJ4PQ

3

CZ-48PJ4PQ

Pipe size reducer (For R410A only: Always use an appropriate kit dedicated for your system.)

U-24~54MX4

CZ-P75BK12Q CZ-P75HK12Q

To select an optimum refrigerant branching kit, refer to "6. Refrigerant piping" on page 4.

Quantity

1

1

1

Quantity

1

1

1

1.4.

Technical and Electrical specifications

Refer to the Engineering Data Book for the complete list of specifications.

2.

M

AIN COMPONENTS

For main components and function of the main components, refer to the Engineering Data Book.

1

2

3

1 2 3

To indoor units

Outdoor unit multi connection piping kit (first branch)

Outdoor unit multi connection piping kit

(second branch)

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

2

3.

S

ELECTION OF LOCATION

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.

This unit, both indoor and outdoor, is suitable for installation in a commercial and light industrial environment. If installed as a household appliance it could cause electromagnetic interference.

■

■

Make sure to provide for adequate measures in order to prevent that the outdoor unit be used as a shelter by small animals.

Small animals making contact with electrical parts can cause malfunctions, smoke or fire. Please instruct the customer to keep the area around the unit clean.

Obtain the customer's permission before installing.

The inverter units should be installed in a location that meets the following requirements:

1

The foundation is strong enough to support the weight of the unit and the floor is flat to prevent vibration and noise generation.

2

If not, the unit may fall over and cause damage or injury.

The space around the unit is adequate for servicing and the minimum space for air inlet and air outlet is available. (Refer to figure 1 and choose one of the possibilities).

A B C D

Sides along the installation site with obstacles

Suction side

■

In case of an installation site where sides

A+B+C+D

have obstacles, the wall heights of sides

A+C

have no impact on service space dimensions. Refer to figure 1 for impact of wall heights of sides

B+D

on service space dimensions.

■

In case of an installation site where only the sides

A+B

have obstacles, the wall heights have no influence on any indicated service space dimensions.

NOTE

The service space dimensions in figure 1 are based on cooling operation at 35°C.

3

4

5

6

7

8

9

10

Make sure that there is no danger of fire due to leakage of inflammable gas.

Ensure that water cannot cause any damage to the location in case it drips out the unit (e.g. in case of a blocked drain pipe).

The piping length between the outdoor unit and the indoor unit may not exceed the allowable piping length. (Refer to

"6.6. Example of connection" on page 8)

Select the location of the unit in such a way that neither the discharged air nor the sound generated by the unit disturbs anyone.

Make sure that the air inlet and outlet of the unit are not positioned towards the main wind direction. Frontal wind will disturb the operation of the unit. If necessary, use a windscreen to block the wind.

Do not install or operate the unit on locations where air contains high levels of salt, like e.g. in the vicinity of oceans. (Refer for further information to the engineering databook).

During installation, avoid the possibility that anybody can climb on the unit or place objects on the unit.

Falls may result in injury.

When installing the unit in a small room, take measures in order to keep the refrigerant concentration from exceeding allowable safety limits in the event of a refrigerant leak.

Excessive refrigerant concentrations in a closed room can lead to oxygen deficiency.

Installation manual

3

■

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 keeping proper distances away from stereo equipment, personal computers, etc...

(See figure 2).

1

2

3

4

5

6

Personal computer or radio

Fuse

Earth leakage breaker

Remote controller

Cool/heat selector

Indoor unit

■

■

■

■

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.

In heavy snowfall areas, select an installation site where snow will not affect the operation of the unit.

The refrigerant R410A itself is nontoxic, nonflammable and is safe. If the refrigerant should leak however, its concentration may exceed the allowable limit depending on room size. Due to this, it could be necessary to take measures against leakage. Refer to the chapter "14. Caution for refrigerant leaks" on page 27.

Do not install in the following locations.

• Locations where sulfurous acids and other corrosive gases may be present in the atmosphere.

Copper piping and soldered joints may corrode, causing refrigerant to leak.

• Locations where a mineral oil mist, spray or vapour may be present in the atmosphere.

Plastic parts may deteriorate and fall off or causing water leakage.

• Locations where equipment that produces electromagnetic waves is found.

The electromagnetic waves may cause the control system to malfunction, preventing normal operation.

• Locations where flammable gases may leak, where thinner, gasoline, and other volatile substances are handled, or where carbon dust and other incendiary substances are found in the atmosphere.

Leaked gas may accumulate around the unit, causing an explosion.

When installing, take strong winds, typhoons or earthquakes into account.

Improper installation may result in fall over of the unit.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

4.

I

NSPECTING AND HANDLING THE UNIT

At delivery, the package should be checked and any damage should be reported immediately to the carrier claims agent.

When handling the unit, take into account the following:

1

Fragile, handle the unit with care.

2

3

Keep the unit upright in order to avoid compressor damage.

Choose on beforehand the path along which the unit is to be brought in.

Bring the unit as close as possible to its final installation position in its original package to prevent damage during transport. (See figure 4)

4

3

4

1

2

5

Packaging material

Opening (large)

Belt sling

Opening (small) (40x45)

Protector

Lift the unit preferably with a crane and 2 belts of at least 8 m long. (See figure 4)

Always use protectors to prevent belt damage and pay attention to the position of the unit's centre of gravity.

NOTE

Use a belt sling of

≤

20 mm wide that adequately bears the weight of the unit.

5

If a forklift is to be used, preferably transport the unit with pallet first, then pass the forklift arms through the large rectangular openings on the bottom of the unit. (See figure 5)

5.1

From the moment you use a forklift to move the unit to its final position, lift the unit under the pallet.

5.2

Once at final position, unpack the unit and pass the forklift arms through the large rectangular openings on the bottom of the unit.

NOTE

Use filler cloth on the forklift arms to prevent damaging the unit. If the paint on the bottom frame peels off, the anti corrosion effect may decrease.

5.

U

NPACKING AND PLACING THE UNIT

■

■

Remove the four screws fixing the unit to the pallet.

Make sure the unit is installed level on a sufficiently strong base to prevent vibration and noise.

Do not use stands to only support the corners. (See figure 7)

X

O

Not allowed (except for U-5MX4)

Allowed (units: mm)

■

■

■

Make sure the base under the unit is larger than the 765 mm of the unit depth. (See figure 3)

The height of the foundation must at least be 150 mm from the floor.

The unit must be installed on a solid longitudinal foundation

(steelbeam frame or concrete) as indicated in figure 3.

Model

U-5MX4

U-8+10MX4

U-12~18MX4

A

635

930

1240

B

497

792

1102

■

Support the unit with a foundation of 67 mm wide or more. (The support leg of the unit is 67 mm wide, see figure 3).

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

■

Fasten the unit in place using four foundation bolts M12. It is best to screw in the foundation bolts until their length surface.

■

■

■

■

Prepare a water drainage channel around the foundation to drain waste water from around the unit.

If the unit is to be installed on a roof, check the strength of the roof and its drainage facilities first.

If the unit is to be installed on a frame, install the waterproofing board within a distance of 150 mm under the unit in order to prevent infiltration of water coming from under the unit.

When installed in a corrosive environment, use a nut with plastic washer (1) to protect the nut tightening part from rust.

1

6.

R

EFRIGERANT PIPING

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.

Use R410A to add refrigerant.

All field piping must be installed by a licensed refrigeration technician and must comply with relevant local and national regulations.

Caution to be taken when brazing refrigerant piping

Do not use flux when brazing copper-to-copper refrigerant piping. (Particularly for the HFC refrigerant piping)

Therefore, use the phosphor copper brazing filler metal

(BCuP) which does not require flux.

Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine based flux is used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant oil.

Be sure to perform a nitrogen blow when brazing. Brazing without performing nitrogen replacement or releasing nitrogen into the piping will create large quantities of oxidized film on the inside of the pipes, adversely affecting valves and compressors in the refrigerating system and preventing normal operation.

After completing the installation work, check that the refrigerant gas does not leak.

Toxic gas may be produced if the refrigerant gas leaks into the room and comes in contact with a source of fire.

Ventilate the area immediately in the event of a leak.

In the event of a leak, do not touch the leaked refrigerant directly. Frostbite may be caused.

Installation manual

4

6.1.

Installation tools

Make sure to use installation tools (gauge manifold charge hose, etc.) that are exclusively used for R410A installations to withstand the pressure and to prevent foreign materials (e.g. mineral oils such as

SUNISO and moisture) from mixing into the system.

(The screw specifications differ for R410A and R407C.)

Use a 2-stage vacuum pump with a non-return valve which can evacuate to –100.7 kPa (5 Torr, –755 mm Hg).

NOTE

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

6.2.

Selection of piping material

1.

2.

Foreign materials inside pipes (including oils for fabrication) must be 30 mg/10 m or less.

Use the following material specification for refrigerant piping:

■

Size: determine the proper size referring to chapter

"6.6. Example of connection" on page 8.

■

Construction material: phosphoric acid deoxidized seamless copper for refrigerant.

■

Temper grade: use piping with temper grade in function of the pipe diameter as listed in the table below.

Pipe Ø

≤

15.9

≥

19.1

O = Annealed

1/2H = Half hard

Temper grade of piping material

O

1/2H

■

The pipe thickness of the refrigerant piping should comply with relevant local and national regulations. The minimal pipe thickness for R410A piping must be in accordance with the table below.

Pipe Ø

6.4

9.5

12.7

15.9

19.1

Minimal thickness t (mm)

0.80

0.80

0.80

0.99

0.80

Pipe Ø

22.2

28.6

34.9

41.3

Minimal thickness t (mm)

0.80

0.99

1.21

1.43

3.

4.

5.

Make sure to use the particular branches of piping that have been selected referring to chapter "6.6. Example of connection" on page 8.

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).

Precautions when selecting branch piping

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 it is possible to increase the size of the main pipes. Refer to page 9. If the recommended pipe size is not available, stick to the original pipe diameter (which may result in a small capacity decrease).

6.3.

Pipe connection

Be sure to perform a nitrogen blow when brazing and to read the paragraph "Caution to be taken when brazing refrigerant piping" on page 4 first.

NOTE

The pressure regulator for the nitrogen released when doing the brazing should be set to 0.02 MPa or less.

(See figure 10)

3

4

5

1

2

6

7

Refrigerant piping

Location to be brazed

Nitrogen

Taping

Manual valve

Regulator

Nitrogen

Do not use anti-oxidants when brazing the pipe joints.

Residue can clog pipes and break equipment.

6.4.

Connecting the refrigerant piping

1 Front connection or side connection

Installation of refrigerant piping is possible as front connection or side connection (when taken out from the bottom) as shown in the figure.

1

1

2

3

2

Left-side connection

Front connection

Right-side connection

3

NOTE Precautions when knocking out knock holes

■

Be sure to avoid damaging the casing

■

After knocking out the holes, we recommend you remove the burrs and paint the edges and areas around the edges using the repair paint to prevent rusting.

■

When passing electrical wiring through the knock holes, wrap the wiring with protective tape to prevent damage.

Installation manual

5

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

2 Removing the pinched piping

When connecting refrigerant piping to the outdoor unit, first remove the pinched piping.

Removing of the pinched piping must be carried out according to the following procedure:

1.

Connect a charge hose to the service port of the liquid side stop valve and to the service port of the gas side stop valve.

2.

Remove the gas from the pinched piping.

3.

When all the gas is removed from the pinched piping, dissolve the brazing using a burner and remove the pinched piping.

Any gas remaining inside the stop valve may blow off the pinched piping, causing damage or injury.

See figure 6.

3

4

1

2

5

Service port

Gas side stop valve

Liquid side stop valve

Point of melting the brazing metal

Pinched piping

Precautions when connecting field piping.

■

Perform brazing at the gas stop valve before brazing at the liquid stop valve.

■

Add brazing material as shown in the figure.

■

Processing the gas side accessory pipe (2)

Only in case of connecting at lateral side, cut the gas side accessory pipe (2) as shown in figure 11.

3

4

1

2

Unit type

5 HP

8 HP

10 HP

12 HP

14~18 HP

Gas side accessory pipe

Cutting location

Gas side piping (field supply)

Base

(mm)

(mm)

(mm)

(mm)

(mm)

A

166

156

156

150

150

B

16

17

23

29

29

C

199

188

192

192

192

D

246

247

247

247

251

NOTE

■

When connecting the piping on site, be sure to use the accessory piping.

■

Make sure the onsite piping does not come into contact with other piping, the bottom frame or side panels of the unit.

4 Outdoor units installed in a multiple outdoor unit system:

U-20~54MX4

■

Front connection:

Remove the stop valve cover to connect. (See figure 8)

■

Bottom connection:

Remove the knock holes on the bottom frame and route the piping under the bottom frame. (See figure 8)

4.1 Precautions when connecting piping between outdoor

units (multiple outdoor unit system)

■

The 5 HP unit type cannot be used as an independent unit in a multi system.

■

To connect the piping between outdoor units, an optional multi connection piping kit CZ-32+48PJ4PQ is always required. When installing the piping, follow the instructions in the installation manual that comes with the kit.

■

Only proceed with piping work after considering the limitations on installing listed here and in the chapter

"6.4. Connecting the refrigerant piping" on page 5, always referring to the installation manual delivered with the kit.

4.2 Possible installation patterns and configurations

■

The piping between the outdoor units must be routed level or slightly upward to avoid the risk of oil detention into the piping side.

Pattern 1

■

Be sure to use the supplied accessory pipes when carrying out piping work in the field.

■

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.

7

8

5

6

3

4

1

2

9

10

11

3 One outdoor unit installed: In case of U-5~18MX4

(See figure 8)

■

Front connection:

Remove the stop valve cover to connect.

■

Bottom connection:

Remove the knock holes on the bottom frame and route the piping under the bottom frame.

A

B

Front connection

Remove the stop valve cover to connect.

Bottom connection:

Remove the knock holes on the bottom frame and route the piping under the bottom frame

Gas side stop valve

Liquid side stop valve

Service port for adding refrigerant

Gas side accessory pipe (1)

Gas side accessory pipe (2)

Liquid side accessory pipe (1)

Liquid side accessory pipe (2)

Brazing

Gas side piping (field supply)

Liquid side piping (field supply)

Punch the knockout holes (use a hammer)

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

1

1

To indoor unit

Pattern 2

1

1

To indoor unit

1

1

Installation manual

6

Prohibited patterns : change to pattern 1 or 2.

If

≥

2 m

Installation manual

7

1

1

1

2

2

To indoor unit

Piping between outdoor units

2

■

To avoid the risk of oil retention to the outmost outdoor unit, always connect the stop valve and the piping between outdoor units as shown in the 4 correct possibilities of the figure below.

Prohibited patterns change to pattern 1 or 2.

1

2

1

1

2 2

2

To indoor unit

Oil collects to the outmost outdoor unit.

Change to configuration as in figures below

2

1

2

1 1

2 2

To indoor unit

Oil collects to the outmost outdoor unit when the system stops.

Correct configuration

1 1

1

To indoor unit

■

If the piping length between the outdoor units exceeds 2 m, create a rise of 200 mm or more in the gas line within a length of 2 m from the kit.

If

≤

2 m

1

2

1

2

≤

2 m

To indoor unit

Piping between outdoor units

1

2

1

2

≤

2 m

≥

2 m

To indoor unit

Piping between outdoor units

5 Branching the refrigerant piping

■

For installation of the refrigerant branching kit, refer to the installation manual delivered with the kit.

(See figure 13)

1

Horizontal surface

Follow the conditions listed below:

- Mount the refnet joint so that it branches either horizontally or vertically.

- Mount the refnet header so that it branches horizontally.

■

Installation of the multi connection piping kit

(See figure 17)

- Install the joints horizontally, so that the caution label (1) attached to the joint comes to the top.

Do not tilt the joint more than 15° (see view

A

).

Do not install the joint vertically (see view

B

).

- Make sure that the total length of the piping connected to the joint is absolute straight for more than 500 mm. Only if a straight field piping of more than 120 mm is connected, more than 500 mm of straight section can be ensured.

- Improper installation may lead to malfunction of the outdoor unit.

6 Piping length restrictions

Make sure to perform the piping installation within the range of the maximum allowable pipe length, allowable level difference and allowable length after branching as indicated in

"6.6. Example of connection" on page 8.

6.5.

Protection against contamination when installing pipes

Take measures to prevent foreign materials like moisture and contamination from mixing into the system.

Installation period

More than a month

Less than a month

Regardless of the period

Protection method

Pinch the pipe

Pinch or tape the pipe

Great caution is needed when passing copper tubes through walls.

Block all gaps in the holes for passing out piping and wiring using sealing material (field supply). (The capacity of the unit will drop and small animals may enter the machine.)

Example: passing piping out through the front

1

2

3

Plug the areas marked with " ".

(When the piping is routed from the front panel.)

Gas side piping

Liquid side piping

1 2 3

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

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

6.6.

Example of connection

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

8

Installation manual

9

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

7.

L

EAK TEST AND VACUUM DRYING

The units were checked for leaks by the manufacturer.

After connecting the field piping, perform the following inspections.

1

Preparations

Referring to figure 27, connect an oxygen tank, a cooling tank, and a vacuum pump to the outdoor unit and perform the airtightness test and the vacuum drying. The stop valve and valves A and B in figure 27 should be open and closed as shown in the table below when performing the airtightness test and vacuum drying.

11

12

13

14

15

16

7

8

9

10

3

4

1

2

5

6

Pressure reducing valve

Nitrogen

Measuring instrument

Tank (siphon system)

Vacuum pump

Charge hose

Service port for adding refrigerant

Gas line stop valve

Liquid line stop valve

Outdoor unit

To indoor unit

Stop valve service port

Dotted lines represent on site piping

Valve B

Valve C

Valve A

State of the valves A and B and the stop valve

Performing the airtightness test and vacuum drying

(Valve A must always be shut. Otherwise the refrigerant in the unit will pour out.)

Valve

A

Valve

B

Valve

C

Liquid side stop valve

Close Open Open Close

Gas side stop valve

Close

2

Airtightness test and vacuum drying

NOTE

Make sure to perform airtightness test and vacuum drying using the service ports of the stop valves of the liquid side and of the gas side. (For the service port location, refer to the

"Caution" label attached on the front panel of the outdoor unit.)

■

See "11.2. Stop valve operation procedure" on page 16 for details on handling the stop valve.

■

To prevent entry of any contamination and to prevent insufficient pressure resistance, always use the special tools dedicated for working with

R410A refrigerant.

■

Airtightness test:

NOTE

Make sure to use nitrogen gas.

■

Vacuum drying: Use a vacuum pump which can evacuate to

–100.7 kPa (5 Torr, –755 mm Hg)

1.

Evacuate the system from the liquid and gas pipes by using a vacuum pump for more than 2 hours and bring the system to

–100.7 kPa. After keeping the system under that condition for more than 1 hour, check if the vacuum gauge rises or not. If it rises, the system may either contain moisture inside or have leaks.

2.

Following should be executed if there is a possibility of moisture remaining inside the pipe (if piping work is carried out during the raining season or over a long period of time, rainwater may enter the pipe during work).

After evacuating the system for 2 hours, pressurize the system to 0.05 MPa (vacuum break) with nitrogen gas and evacuate the system again using the vacuum pump for 1 hour to –100.7 kPa

(vacuum drying). If the system cannot be evacuated to

–100.7 kPa within 2 hours, repeat the operation of vacuum break and vacuum drying.

Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does not rise.

8.

F

IELD WIRING

All field wiring and components must be installed by a licensed electrician and must comply with relevant local and national regulations.

The field wiring must be carried out in accordance with the wiring diagrams and the instructions given below.

Be sure to use a dedicated power circuit. Never use a power supply shared by another appliance. This can lead to electric shock or fire.

Be sure to install an earth leakage circuit breaker.

(Because this unit uses an inverter, install an earth leakage circuit breaker that is capable of handling high harmonics in order to prevent malfunctioning of the earth leakage breaker itself.)

Do not operate until refrigerant piping work is completed.

(If operated before completion of the piping work, the compressor may break down.)

Never remove a thermistor, sensor, etc., when connecting power wiring and transmission wiring.

(If operated without thermistor, sensor, etc., the compressor may break down.)

This product's reversed phase protection detector only works when the product started up.

The reversed phase protection detector is designed to stop the product in the event of an abnormalities when the product is started up.

Replace two of the three phases (L1, L2, and L3) during reverse-phase protection circuit operation.

Reversed phase detection is not performed while the product is operating.

If there exists the possibility of reversed phase after an 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.

Means for disconnection must be incorporated in the field wiring in accordance with the wiring rules.

(An all-pole disconnection switch must be available on the unit.)

Pressurize the liquid and gas pipes to 4.0 MPa (40 bar) (do not pressurize more than 4.0 MPa (40 bar)). If the pressure does not drop within 24 hours, the system passes the test. If the pressure drops, check where the nitrogen leaks from.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

10

8.1.

Internal wiring – Parts table

Refer to the wiring diagram sticker on the unit. The abbreviations used are listed below:

A1P~7P ..................Printed circuit board

BS1~5 ....................Push button switch (mode, set, return, test, reset)

C1,C63,C66 ...........Capacitor

DS1,2 .....................Dip switch

E1HC~3HC ............Crankcase heater

F1U ........................Fuse (250 V, 8 A, B) (A4P) (A8P)

F1U,2U ...................Fuse (250 V, 3.15 A, T) (A1P)

F5U ........................Field fuse

F400U ....................Fuse (250 V, 6.3 A, T) (A2P)

H1P~8P..................Light emitting diode (service monitor - orange)

HAP........................Pilot lamp (service monitor - green)

K1...........................Magnetic relay

K2...........................Magnetic contactor (MIC)

K2M,3M..................Magnetic contactor (M2C,M3C)

K1R,R.....................Magnetic relay (K2M,K3M)

K3R~5R..................Magnetic relay (Y1S~Y3S)

K6R~9R..................Magnetic relay (E1HC~E3HC)

L1R.........................Reactor

M1C~3C .................Motor (compressor)

M1F,2F ...................Motor (fan)

PS ..........................Switching power supply (A1P,A3P)

Q1DI.......................Earth leakage breaker (field supply)

Q1RP .....................Phase reversal detection circuit

R1T ........................Thermistor (fin) (A2P)

R1T ........................Thermistor (air) (A1P)

R2T ........................Thermistor (suction)

R4T ........................Thermistor (coil-deicer)

R5T ........................Thermistor (coil-outlet)

R6T ........................Thermistor (liquid-pipe receiver)

R7T ........................Thermistor (accumulator)

R10.........................Resistor (current sensor) (A4P) (A8P)

R31T~33T ..............Thermistor (discharge) (M1C~M3C)

R50,59....................Resistor

R95.........................Resistor (current limiting)

S1NPH ...................Pressure sensor (high)

S1NPL....................Pressure sensor (low)

S1PH,3PH..............Pressure switch (high)

T1A.........................Current sensor (A6P,A7P)

SD1 ........................Safety devices input

V1R ........................Power module (A4P,A8P)

V1R,V2R ................Power module (A3P)

X1A,X4A.................Connector (M1F,M2F)

X1M........................Terminal strip (power supply)

X1M........................Terminal strip (control) (A1P)

X1M........................Terminal strip (A5P)

Y1E,2E ...................Expansion valve (electronic type) (main, subcool)

Y1S ........................Solenoid valve (hotgas bypass)

Y2S ........................Solenoid valve (oil return)

Y3S ........................Solenoid valve (4 way valve)

Z1C-7C...................Noise filter (ferrite core)

Z1F.........................Noise filter (with surge absorber)

L1,L2,L3................. Live

N ............................ Neutral

............... Field wiring

................. Terminal strip

......................... Connector

......................... Terminal

.......................... Protective earth (screw)

BLK........................ Black

BLU........................ Blue

BRN ....................... Brown

GRN....................... Green

GRY ....................... Grey

ORG ...................... Orange

PNK ....................... Pink

RED ....................... Red

WHT ...................... White

YLW ....................... Yellow

NOTE

(1) This wiring diagram only applies to the outdoor unit.

(4) When using the option adaptor, refer to the installation manual.

(5) Refer to the installation manual, for connection wiring to indoor-outdoor transmission F1-F2, outdoormulti transmission Q1-Q2 and on how to use BS1~BS5 and DS1, DS2 switch.

(6) Do not operate the unit by short-circuiting protection device S1PH.

8.2.

Optional parts cool/heat selector

S1S........................ Selector switch (fan, cool/heat)

S2S........................ Selector switch (cool/heat)

NOTE

■

Use copper conductors only.

■

For connection wiring to the central remote controller, refer to the installation manual of the central remote controller.

■

Use insulated wire for the power cord.

Installation manual

11

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

8.3.

Power circuit and cable requirements

U-5MX4

U-8MX4

U-10MX4

U-12MX4

U-14MX4

U-16MX4

U-18MX4

U-20MX4

U-22MX4

U-24MX4

U-26MX4

U-28MX4

U-30MX4

U-32MX4

U-34MX4

U-36MX4

U-38MX4

U-40MX4

U-42MX4

U-44MX4

U-46MX4

U-48MX4

U-50MX4

U-52MX4

U-54MX4

A power circuit (see table below) must be provided for connection of the unit. This circuit must be protected with the required safety devices, i.e. a main switch, a slow blow fuse on each phase and an earth leakage breaker.

Phase and frequency Voltage

Minimum circuit ampere

3 N~50 Hz 400 V 11.9 A

3 N~50 Hz 400 V 18.5 A

3 N~50 Hz 400 V 21.6 A

3 N~50 Hz 400 V 22.7 A

3 N~50 Hz 400 V 31.5 A

3 N~50 Hz 400 V 31.5 A

3 N~50 Hz 400 V 32.5 A

3 N~50 Hz 400 V 41.2 A

3 N~50 Hz 400 V 44.3 A

3 N~50 Hz 400 V 50.4 A

3 N~50 Hz 400 V 51.0 A

3 N~50 Hz 400 V 54.1 A

3 N~50 Hz 400 V 55.2 A

3 N~50 Hz 400 V 63.0 A

3 N~50 Hz 400 V 64.0 A

3 N~50 Hz 400 V 65.0 A

3 N~50 Hz 400 V 73.7 A

3 N~50 Hz 400 V 81.5 A

3 N~50 Hz 400 V 82.5 A

3 N~50 Hz 400 V 83.5 A

3 N~50 Hz 400 V 86.6 A

3 N~50 Hz 400 V 87.7 A

3 N~50 Hz 400 V 96.5 A

3 N~50 Hz 400 V 96.5 A

3 N~50 Hz 400 V 97.5 A

Recommended fuses

16 A

32 A

32 A

32 A

50 A

50 A

50 A

63 A

63 A

63 A

63 A

63 A

80 A

80 A

80 A

80 A

100 A

100 A

100 A

100 A

100 A

100 A

125 A

125 A

125 A

Transmission line section

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

0.75~1.25 mm

2

NOTE

The above table indicates power specifications for page 1.

If using anything other than the above combinations in a multiple outdoor unit system, calculate using the following procedure.

Calculate the recommended fuse capacity

Calculate, by adding the minimum circuit ampere of each used unit (according to the table above), multiply the result by 1.1 and select the next higher recommended fuse capacity.

Example

Combining the U-30MX4 by using the U-8MX4,

U-10MX4, and U-12MX4.

Minimum circuit ampere of the U-8MX4 = 18.5 A

Minimum circuit ampere of the U-12MX4 = 21.6 A

Minimum circuit ampere of the U-12MX4 = 22.7 A

Accordingly, the minimum circuit ampere of the

U-30MX4=18.5+21.6+22.7= 62.8 A

Multiplying the above result by 1.1

(62.8 x 1.1)=69.08 A, so the recommended fuse capacity would be 80 A.

When using residual current operated circuit breakers, be sure to use a high-speed type 300 mA rated residual operating current.

Be sure to install a main switch for the complete system.

NOTE

■

Select the power supply cable in accordance with relevant local and national regulations.

■

Wire size must comply with the applicable local and national code.

■

Specifications for local wiring power cord and branch wiring are in compliance with IEC60245.

■

WIRE TYPE H05VV(*)

*Only in protected pipes (use H07RN-F when protected pipes are not used).

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

8.4.

General cautions

■

Up to 3 units can be connected by crossover power source wiring between outdoor units. However, units of smaller capacity must be connected downstream. For details, refer to the technical data.

■

When connecting several units in Urban Multi combination, the power supply of each outdoor unit can also be connected separately. Refer to the field wiring on the engineering data book for further details.

■

Make sure to connect the power source wire to the power source terminal block and to clamp it as shown in figure 21 and described in chapter "8.8. Field line connection: power wiring" on page 14.

■

As this unit is equipped with an inverter, installing a phase advancing capacitor not only will deteriorate power factor improvement effect, but also may cause capacitor abnormal heating accident due to high-frequency waves. Therefore, never install a phase advancing capacitor.

■

Keep power imbalance within 2% of the supply rating.

• Large imbalance will shorten the life of the smoothing capacitor.

• As a protective measure, the product will stop operating and an error indication will be made, when power imbalance exceeds 4% of the supply rating.

■

Follow the "electrical wiring diagram" supplied with the unit when carrying out any electrical wiring.

■

Only proceed with wiring work after all power is shut off.

■

Always ground wires. (In accordance with national regulations of the pertinent country.)

■

Do not connect the ground wire to gas pipes, sewage pipes, lightning rods, or telephone ground wires. This may cause electric shock.

• Combustion gas pipes: can explode or catch fire if there is a gas leak.

• Sewage pipes: no grounding effect is possible if hard plastic piping is used.

• Telephone ground wires and lightning rods: dangerous when struck by lightning due to abnormal rise in electrical potential in the grounding.

■

This unit uses an inverter, and therefore generates noise, which will have to be reduced to avoid interfering with other devices.

The outer casing of the product may take on an electrical charge due to leaked electrical current, which will have to be discharged with the grounding.

■

Be sure to install an earth leakage breaker. (One that can handle high-frequency electrical noise.)

(This unit uses an inverter, which means that an earth leakage breaker capable of handling high-frequency electrical noise must be used in order to prevent malfunctioning of the earth leakage breaker itself.)

■

Earth leakage breakers that are especially designed for protecting ground-faults must be used in conjunction with main switch and fuse for use with wiring.

■

Never connect the power supply in reversed phase.

The unit can not operate normally in reversed phase. If you connect in reversed phase, replace two of the three phases.

■

This unit has a reverse phase detection circuit. (If it is activated, only operate the unit after correcting the wiring.)

■

Power supply wires must be attached securely.

■

If the power supply has a missing or wrong N-phase, equipment will break down.

■

Make sure that all wiring is secure, the specified wires are used, and no external forces act on the terminal connection or wires.

■

Improper connections or installation may result in fire.

■

When wiring the power supply and connecting the remote controller wiring and transmission wiring, position the wires so that the control box lid can be securely fastened.

Improper positioning of the control box lid may result in electric shocks, fire, or overheating of the terminals.

Installation manual

12

8.5.

System examples

(See figure 15)

3

4

1

2

5

6

Field power supply

Main switch

Earth leakage breaker

Outdoor unit

Indoor unit

Remote controller

Power supply wiring (sheathed cable) (200 V)

Transmission wiring (sheathed cable) (16 V)

5

6

3

4

7

8

8.6.

Leading power line and transmission line

■

Be sure to let the power line and the transmission line pass through a conduit hole.

■

Lead the power line from the upper hole on the left side plate, from the front position of the main unit (through the conduit hole of the wiring mounting plate) or from a knock out hole to be made in the unit's bottom plate. (See figure 18)

1

2

Electric wiring diagram. Printed on the back of the electric box lid.

Power wiring and ground wiring between outdoor units (inside conduit)

(When the wiring is routed out through the lateral panel.)

Transmission wiring

Pipe opening

Conduit

Power wiring and ground wiring

Cut off the shaded zones before use.

Through cover

Precautions when knocking out knockout holes

■

To punch a knockout hole, hit on it with a hammer.

■

After knocking out the holes, we recommend you paint the edges and areas around the edges using the repair paint to prevent rusting.

■

When passing electrical wiring through the knockout holes, remove any burrs from the knockout holes and wrap the wiring with protective tape to prevent damage.

1

2

3

1 2

3

Knockout hole

Burr

If there are any possibilities that small animals enter the system through the knockout holes, plug the holes with packing materials

(to be prepared on-site).

■

Use a power wire pipe for the power wiring.

■

Outside the unit, make sure the weak low voltage electric wiring (i.e. for the remote control, between units, etc.) and the high voltage electric wiring do not pass near each other, keeping them at least 50 mm apart. Proximity may cause electrical interference, malfunctions, and breakage.

■

Be sure to connect the power wiring to the power wiring terminal block and secure it as described under

"Field line connection: power wiring" on page 14.

■

Inter-unit wiring should be secured as described in

"8.7. Field line connection: transmission wiring and cool/heat selection" on page 13.

• Secure the wiring with the accessory clamps so that it does not touch the piping and no external force can be applied to the terminal.

• Make sure the wiring and the electric box lid do not stick up above the structure, and close the cover firmly.

8.7.

Field line connection: transmission wiring and cool/heat selection

In case of U-5~18MX4 (See figure 19)

3

4

1

2

5

6

7

Cool/heat selector

Outdoor unit PC board (A1P)

Take care of the polarity

Use the conductor of sheathed wire (2 wire) (no polarity)

Terminal board (field supply)

Indoor unit

Outdoor unit

In case of U-20~54MX4 (See figure 20)

4

5

6

7

1

2

3

Unit A (Master unit)

Unit B (Slave unit)

Unit C (Slave unit)

To slave unit(s)

To indoor unit

To outdoor unit

To cool/heat selector

NOTE

U-5MX4 cannot install the multi unit transmission wiring. Run will not be successful if the wiring is connected to Q1-Q2 (TO MULTI UNIT) terminal.

■

The interconnecting wiring between the outdoor units in the same piping system must be connected to the Q1/Q2 (Out Multi) terminals. Connecting the wires to the F1/F2 (Out-Out) terminals results in system malfunction.

■

The wiring for the other systems must be connected to the F1/F2

(Out-Out) terminals of the P-board in the outdoor unit to which the interconnecting wiring for the indoor units is connected.

■

The base unit is the outdoor unit to which the interconnecting wiring for the indoor units is connected.

Installation manual

13

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Fixing transmission wiring (See figure 23)

Inside switchbox

1

2

5

6

3

4

Heating/cooling switching remote control cord (when a heating/ cooling switch remote control (optional) is connected) (ABC) (not for U-5~18MX4)

Fix to the indicated plastic brackets using field supplied clamping material.

Wiring between the units (Outdoor - outdoor) (F1+F2 right)

Wiring between the units (Indoor - outdoor) (F1+F2 left)

Wiring for multi connection (only for U-20~54MX4) (Q1+Q2)

Plastic bracket

Outside unit

■

Be sure to follow the limits below. If the unit-to-unit cables are beyond these limits, it may result in malfunction of transmission.

Maximum wiring length:

Total wiring length:

1000 m

2000 m

Maximum interunit wiring length between outdoor units:

Transmission wiring to cool/heat selector:

Maximum number of branches:

30 m

500 m

16

■

Maximum number of outdoor units connectable: 10.

■

Up to 16 branches are possible for unit-to unit cabling.

No branching is allowed after branching.

(See figure 16)

7

8

A

5

6

1

2

3

4

Outdoor unit

Indoor unit

Main line

Branch line 1

Branch line 2

Branch line 3

No branch is allowed after branch

Central remote controller (etc...)

Transmission wiring between outdoor unit and indoor unit(s)

Transmission wiring between outdoor units

B

■

Never connect the power supply to transmission wiring terminal block. Otherwise the entire system may break down.

■

Never connect 400 V to the terminal block of the interconnecting wiring. Doing so will break the entire system.

The wiring from the indoor units must be connected to the F1/F2 (In-Out) terminals on the

PC board in the outdoor unit.

After installing the interconnecting wires inside the unit, wrap them along with the on-site refrigerant pipes using finishing tape, as shown in figure 12.

1

2

3

4

5

Liquid pipe

Gas pipe

Insulator

Interconnecting wiring

Finishing tape

For the above wiring, always use vinyl cords with 0.75

to 1.25 mm

2

sheath or cables (2-core wires). (3-core wire cables are allowable for the cooler/heater changeover remote controller only.)

■

Be sure to keep the power line and transmission line apart from each other.

■

Be careful about polarity of the transmission line.

■

Make sure that the transmission line is clamped as shown in figure 23.

■

Check that wiring lines do not make contact with refrigerant piping.

■

Firmly close the lid and arrange the electrical wires so as to prevent the lid or other parts from coming loose.

■

When you do not use a wire conduit, be sure to protect the wires with vinyl tubes etc, to prevent the edge of the knock-out hole from cutting the wires.

Sequential start

The outdoor unit PC board (A1P) is factory set at "Sequential start available".

Setting the cool/heat operation

1

Performing cool/heat setting with the remote controller connected to the indoor unit.

Keep the cool/heat selector switch (DS1) on the outdoor unit PC board at the factory setting position IN/D UNIT. (See figure 22)

1

Remote controller

2

Performing cool/heat setting with the cool/heat selector.

Connect the cool/heat selector remote controller (optional) to the

A/B/C terminals and set the cool/heat selector switch (DS1) on the outdoor unit PC board (A1P) to OUT/D UNIT. (See figure 25)

1

Cool/heat selector

For low-noise operation, it is necessary to get the optional

'External control adaptor for outdoor unit' (DTA104A61/62).

For details, see the installation manual attached to the adaptor.

7

8

9

10

11

3

4

1

2

5

6

8.8.

Field line connection: power wiring

The power cord must be clamped to the plastic bracket using field supplied clamp material.

The green and yellow striped wrapped wires must be used for grounding. (See figure 21)

Power supply (400 V, 3 N~50 Hz)

Fuse

Earth leakage breaker

Grounding wire

Power supply terminal block

Connect each power wire

RED to L1, WHT to L2, BLK to L3 and BLU to N

Ground wire (GRN/YLW)

Clamp the power wire to the plastic bracket using a field supplied clamp to prevent external force being applied to the terminal.

Clamp (field supply)

Cup washer

When connecting the earth wire, it is recommended to perform curling.

■

Do not allow the ground wires to contact the compressor lead wires. If the wires contact each other, adverse effects may occur to other units.

■

When connecting or disconnecting a power supply cord, make sure that the current-carrying conductors become taut before the earthing conductor.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

14

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 below.

■

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 strip the head and make proper tightening impossible.

■

Over-tightening the terminal screws may break them.

■

See the table below for tightening torque for the terminal screws.

Tightening torque (N•m)

M8 (Power terminal block)

M8 (Ground)

M3 (Inter-unit wiring terminal block)

5.5~7.3

0.8~0.97

Recommendations when connecting the ground

When pulling the ground wire out, wire it so that it comes through the cut out section of the cup washer. (An improper ground connection may prevent a good ground from being achieved.) (See figure 21)

16

17

18

12

13

14

15

8.9.

Wiring example for wiring inside unit

See figure 26.

7

8

9

10

11

1

2

3

4

5

6

Electric wiring

Wiring between units

Clamp to the electric box with field supplied clamps.

When routing out the power/ground wires from the right side:

When routing the remote control cord and inter-unit wiring, secure clearance of 50 mm or more from the power wiring. Ensure that the power wiring does not contact any heated sections ( ).

Clamp to the back of the column support with field supplied clamps.

When routing out the inter-unit wirings from the opening for piping:

When routing out the power/ground wires from the front:

When routing out the ground wires from the left side:

Grounding wire

When wiring, pay attention not to detach the acoustic insulators from the compressor.

Power supply

Fuse

Earth leakage breaker

Ground wire

Unit A

Unit B

Unit C

9.

P

IPE INSULATION

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 liquid and gas piping (for all units).

■

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

■

Reinforce the insulation on the refrigerant piping according to the installation environment.

Ambient temperature

≤

30°C

>30°C

Humidity

75% to 80% RH

≥

80 RH

Minimum thickness

15 mm

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 figure 9.

1

2

3

4

5

6

Gas line stop valve

Liquid line stop valve

Service port for adding refrigerant

Sealing up treatment

Insulation

Indoor -outdoor interconnection piping

Be sure to insulate local pipes, as touching them can cause burns.

10. C

HECKING OF UNIT AND INSTALLATION

CONDITIONS

Be sure to check the following:

The piping work

1

Make sure piping size is correct.

See "6.2. Selection of piping material" on page 5.

2

Make sure insulation work is done.

See "9. Pipe insulation" on page 15.

3

Make sure there is no faulty refrigerant piping.

See "6. Refrigerant piping" on page 4.

The electrical work

1

Make sure there is no faulty power wiring or loose nuts.

See "8. Field wiring" on page 10.

2

Make sure there is no faulty transmission wiring or loose nuts.

See "8. Field wiring" on page 10.

3

Make sure the insulation resistance of the main power circuit is not deteriorated.

V, check that the insulation resistance of 2 M

Ω

or more is attained by applying a voltage of

500 V DC between the power terminals and earth. Never use the megatester for the transmission wiring (between outdoor and indoor unit, outdoor and COOL/HEAT selector, etc.).

Installation manual

15

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

11. C

HARGING REFRIGERANT

The outdoor unit is factory charged, but depending on the length of the piping when installed, the outdoor unit may require additional charging.

For charging the additional refrigerant follow the procedure as described in this chapter.

Refrigerant cannot be charged until all field wiring and field piping has been completed.

Refrigerant may only be charged after performing the leak test and the vacuum drying.

The refrigerant charge of the system must be less than

100 kg. This means that in case the calculated refrigerant charge is equal to or more than 95 kg you must divide your multiple outdoor system into smaller independent systems, each containing less than 95 kg refrigerant charge.

For factory charge, refer to the unit name plate.

11.1. Precautions when adding R410A

Be sure to charge the specified amount of refrigerant in liquid state to the liquid pipe.

Since this refrigerant is a mixed refrigerant, adding it in gas form may cause the refrigerant composition to change, preventing normal operation.

■

Before charging, check whether the refrigerant cylinder is equipped with a siphon tube or not.

Charge the liquid refrigerant with the cylinder in upright position.

Charge the liquid refrigerant with the cylinder in up-side-down position.

■

Be sure to use tools exclusively for R410A to ensure required pressure resistance and to prevent foreign materials from mixing into the system.

Charging with an unsuitable substance may cause explosions and accidents, so always make sure that the appropriate refrigerant (R410A) is charged.

Refrigerant containers must be opened slowly.

11.2. Stop valve operation procedure

■

Do not open the stop valve until all piping and installation conditions" on page 15 are completed. If the stop valve is left open without turning on the power, it may cause refrigerant to build up in the compressor, leading to insulation degradation.

■

Always use a charge hose for service port connection.

■

After tightening the cap, check that no refrigerant leaks are present.

Size of stop valve

The sizes of the stop valves connected to the system are as listed in the table below.

Type

Liquid line stop valve

5 8 10

Ø9.5

(a)

12 14 16

Ø12.7

(b)

18

Gas line stop valve Ø15.9 Ø19.1

Ø25.4

(c)

(a) The model U-12MX4 supports field piping of Ø12.7 on the accessory pipe supplied with the unit.

(b) The model U-18MX4 supports field piping of Ø15.9 on the accessory pipe supplied with the unit.

(c) The model U-10MX4 supports field piping of Ø22.2 on the accessory pipe supplied with the unit.

The model U-12~18MX4 supports field piping of Ø28.6 on the accessory pipe supplied with the unit.

Opening stop valve (See figure 14)

3

4

1

2

5

Service port

Cap

Hexagon hole

Shaft

Seal

1.

Remove the cap and turn the valve counterclockwise with the hexagon wrench.

2.

Turn it until the shaft stops.

Do not apply excessive force to the stop valve. Doing so may break the valve body, as the valve is not a backseat type. Always use the special tool.

3.

Make sure to tighten the cap securely. Refer to the table below

Stop valve size

Ø9.5

Ø12.7

Ø15.9

Ø22.2

Ø25.4

Tightening torque N•m (Turn clockwise to close)

Valve body

Shaft

Hexagonal wrench

5.4~6.6

8.1~9.9

13.5~16.5

4 mm

6 mm

Cap (valve lid) Service port

13.5~16.5

18.0~22.0

23.0~27.0

11.5~13.9

27.0~33.0

8 mm 22.5~27.5

Closing stop valve (See figure 14)

1.

Remove the cap and turn the valve clockwise with the hexagon wrench.

2.

Securely tighten the valve until the shaft contacts the main body seal.

3.

Make sure to tighten the cap securely.

For the tightening torque, refer to the table above.

11.3. How to check how many units are connected

It is possible to find out how many indoor units are active and connected by operating the push-button switch on the printed circuit board (A1P) of the working outdoor unit. In a multiple outdoor unit system, you can find out how many outdoor units are connected to the system by using the same procedure.

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

Follow the 5-step procedure as explained below.

■

The LEDs on the A1P shows the operating status of the outdoor unit and the number of indoor units that are active.

x

OFF w

ON c

Blinking

■

The number of units that are active can be read from the LED display in the "Monitor Mode" procedure below.

Example: in the following procedure there are 22 units active:

NOTE

Wherever during this procedure, press the

BS1 MODE

button if something becomes unclear.

You will return to setting mode 1 (H1P= x

"OFF").

1 Setting mode 1 (default system status)

Default status (normal)

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

Press the mode.

BS1 MODE

button to switch from setting mode 1 to monitor

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

16

2

Monitor mode

Default status display

H1P H2P H3P H4P H5P H6P H7P

c x x x x x x

To check the number of indoor units, press the

BS2 SET

button 5 times

To check the number of outdoor units, p ress the

BS2 SET

button 8 times

3 Monitor mode

H1P H2P H3P H4P H5P H6P H7P

Selection status of how many connected indoor units to display.

c x x x w x w

OR

H1P H2P H3P H4P H5P H6P H7P

Selection status of how many connected outdoor units to display. c x x w x x x

Pressing the

BS3 RETURN

button causes the LED display to show the data on the number of indoor units that are connected or how many outdoor units that are connected in a multiple outdoor unit system.

4 Monitor mode

Displaying the number of connected indoor units

H1P H2P H3P H4P H5P H6P H7P

c x c x c c x

32 16 8 4 2 1

Calculate the number of connected indoor units by adding the values of all (H2P~H7P) blinking ( c ) leds together.

In this example: 16+4+2=22 units

Press the

(H1P=

BS1 MODE

x

"OFF").

button to return to step 1, setting mode 1

11.4. Additional refrigerant charge

There are two ways to charge refrigerant. Use the selected method following the described procedure below.

■

Adding refrigerant using leak detection function.

Refer to "1 Adding refrigerant using leak detection function" on page 17

■

Adding refrigerant without using leak detection function.

Refer to "2 Adding refrigerant without using leak detection function" on page 20

Adding refrigerant using the automatic refrigerant charging function is recommended.

If refrigerant is added manually, without using the automatic refrigerant charging function, the refrigerant leak detection function cannot be used.

The refrigerant leak detection function can be used during regular inspections or maintenance after installation of the unit.

Follow the procedures below.

■

When charging a system, charging over the permissible quantity can cause liquid hammer.

■

Always use protective gloves and protect your eyes when charging refrigerant.

■

When the refrigerant charging procedure is done or when pausing, close the valve of the refrigerant tank immediately. If the tank is left with the valve open, the amount of refrigerant which is properly charged may get off point. More refrigerant may be charged by any remaining pressure after the unit has stopped.

Electric shock warning

■

Close the electric box lid before turning on the main power.

■

Perform the settings on the circuit board (A1P) of the outdoor unit and check the LED display after the power is on via the service lid which is in the lid of the electric box.

Operate switches with an insulated stick (such as a ballpoint pen) to avoid touching the life parts.

Make sure to re-attach the inspection cover into the switch box cover after the job is finished.

■

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

■

In case of a multiple outdoor system, turn on the power of all outdoor units.

■

Make sure to turn ON the power 6 hours before starting the operation. This is necessary to warm the crankcase by the electric heater.

■

If operation is performed within 12 minutes after the indoor and outdoor units are turned on, the

H2P-led will be lit and the compressor will not operate.

NOTE

■

See "11.2. Stop valve operation procedure" on page 16 for details on how to handle stop valves.

■

The refrigerant charging port is connected to the piping inside the unit.

The unit’s internal piping is already factory charged with refrigerant, so be careful when connecting the charge hose.

■

After adding the refrigerant, do not forget to close the lid of the refrigerant charging port.

The tightening torque for the lid is 11.5 to

13.9 N•m.

■

In order to ensure uniform refrigerant distribution, it may take the compressor

±10 minutes to start up after the unit has started operation. This is not a malfunction.

1

Adding refrigerant using leak detection function

The automatic refrigerant charging has limits as described below.

At out of limit, the system can not operate the automatic refrigerant charging.

Outdoor temperature

Indoor temperature

Total indoor unit capacity

: 0°C DB~43°C DB

: 20°C DB~32°C DB

:

≥

80%

Installation manual

17

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

9

10

11

12

13

14

5

6

7

8

1

2

3

4

To speed up the proces of charging refrigerant for large systems, it is recommended to first manually charge a portion of the refrigerant first before performing automatic charging.

1

Calculate how much refrigerant to be added using the formula explained in the chapter "How to calculate the additional refrigerant to be charged" on page 9.

2

The amount of pre-charging is 10 kg less than the calculated amount.

3

Open valve C (valves A and B and the stop valves must be left closed) and charge the refrigerant in liquid form via the liquid side stop valve service port.

(See figure 28)

Measuring instrument

Tank (siphon system)

Charge hose

Liquid line stop valve

Gas line stop valve

Stop valve service port

Valve B

Valve C

Valve A

Outdoor unit

Refrigerant charge port

To indoor unit

Interunit piping

Refrigerant flow

4

If the calculated amount of pre-charging is reached, close valve C.

At least the unit should be charged with its original amount of refrigerant (refer to the nameplate on the unit), before starting the automatic charging.

5

After pre-charging, perform the refrigerant charge operation as shown below and charge the remaining refrigerant of the additional charging amount through valve A.

(See figure 29)

7

8

9

10

3

4

1

2

5

6

11

12

13

14

Measuring instrument

Tank (siphon system)

Charge hose

Liquid line stop valve

Gas line stop valve

Stop valve service port

Valve B

Valve C

Valve A

Outdoor unit

Refrigerant charge port

Field piping

Refrigerant flow

Indoor unit

NOTE

For a multi outdoor unit system, it is not required to connect all charge ports to a refrigerant tank.

The refrigerant will be charged with ±22 kg in

1 hour time at an outdoor temperature of 30°C DB

0°C DB.

If you need to speed up in case of a multiple outdoor system, connect the refrigerant tanks to each outdoor unit as shown in figure 29.

1.

Start of automatic charging refrigerant

Open the liquid and gas side stop valves and the service port stop valve. (Valves A, B and C must be closed.)

Close all frontpanels except the electric box frontpanel and turn the power ON.

Make sure all indoor units are connected, refer to "11.3. How to check how many units are connected" on page 16.

If the H2P led is not flashing (in 12 minutes time after turning on the power), make sure it is displayed as shown in the

"Normal system display" on page 21.

If the H2P led is flashing, check the malfunction code on the remote controller "4 Remote controller malfunction code display" on page 21.

2.

Press the

BS1 MODE

button once if the LEDs combination is not as in the figure below.

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

3.

Press the

BS4 TEST

button once.

H1P H2P H3P H4P H5P H6P H7P

w w w w w w w

4.

Hold the

BS4 TEST

button down for 5 seconds or more.

5.

Charging mode judgement

For automatic charging, the charging must be done in cooling mode.

However, if the indoor temperature is 20°C DB or lower, in some cases the unit will first charge in heating mode to increase the indoor temperature.

The unit will automatically select the cooling mode or heating mode for charging.

During charging in heating mode, a person must manually close valve A before complete charging is finished. The required amount is the the calculated amount (see "6.6. Example of connection" on page 8) minus 10 kg, therefore, the weight must be monitored constantly.

Continue with the automatic charging in cooling mode OR in heating mode.

■

Charging in heating mode

6.

Start up

Wait while the unit is preparing for charging in heating mode.

Pressure control

(for the first minute)

Start up control

(for the next 2 minutes)

Waiting for stable heating conditions

(for the next ±15 minutes (according to the system))

H1P H2P H3P H4P H5P H6P H7P

x c x x x x w c c x c c x x x x w x x w w

7.

Ready

H1P H2P H3P H4P H5P H6P H7P

c c x x w x w

Press the

BS4 TEST

button once within 5 minutes.

If the

BS4 TEST

button is not pushed within 5 minutes,

P2

will be displayed on the remote controller. Refer to "4 Remote controller malfunction code display" on page 21.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

18

8.

Operation

When the following led display is shown, open valve A and close the frontpanel. If the frontpanel is left open, the system can not operate properly during the refrigerant charging.

H1P H2P H3P H4P H5P H6P H7P

w c

* * * * *

*

= The state of this led is not important.

When a malfunction occurs, check the display of the remote controller and refer to "Remote controller malfunction code display" on page 21.

9.

Complete

If the calculated amount of refrigerant minus 10 kg is reached, close valve A and press the

BS3 RETURN

button once.

H1P H2P H3P H4P H5P H6P H7P

c c c w w w w

As long as the

BS3 RETURN

button is not pressed, the system will remain in heating mode. This can be required to increase the indoor temperature.

10. Press the

BS4 TEST

button to perform the temperature range check

Out of range:

H1P H2P H3P H4P H5P H6P H7P

Out of outdoor temperture range

Out of indoor temperture range w c c c w x x w c c c x w x

In these cases, press the

BS1 MODE

button once and follow the procedure as "5 Final adjustment of the amount of refrigerant" on page 22.

In range:

The unit will restart from the charging mode judgement onwards and the cooling mode will be selected. However, if in the mean time the temperature has become out of range, heating mode will be selected again, this is required to increase the indoor temperature.

■

Charging in cooling mode

H1P H2P H3P H4P H5P H6P H7P

x c x x x x w

6.

Start up

Wait while the unit is preparing for charging in cooling mode.

Pressure control

(for the first minute)

Start up control

(for the next 2 minutes)

Waiting for stable heating conditions

(for the next ±15 minutes (according to the system))

H1P H2P H3P H4P H5P H6P H7P

x c x x x x w x c x x c x x x x w x x w w

7.

Ready

H1P H2P H3P H4P H5P H6P H7P

c c c x w x w

Press the

BS4 TEST

button once within 5 minutes.

If the

BS4 TEST

button is not pushed within 5 minutes,

P2

will be displayed on the remote controller. Refer to "4 Remote controller malfunction code display" on page 21.

8.

Operation

When the following led display is shown, open valve A and close the frontpanel. If the frontpanel is left open, the system can not operate properly during the refrigerant charging.

H1P H2P H3P H4P H5P H6P H7P

w c

* * * * *

*

= The state of this led is not important.

When a malfunction occurs, check the display of the remote controller and refer to "Remote controller malfunction code display" on page 21.

9.

Complete

If the display on the remote controller shows a flashing

PE

code, charging is almost finished.

When the unit stops operating, close valve A immediately and check the leds and check if the

P9

code is displayed on the remote controller. When the charging amount is little, the

PE

code may not be displayed, but instead the

P9

code will be displayed immediately.

H1P H2P H3P H4P H5P H6P H7P

w c c w w w w

If it is not as shown above, correct the malfunction (as indicated in the display of the remote controller) and restart the complete charging procedure.

10. Press the

BS4 TEST

button to perform the temperature range check

Out of range:

H1P H2P H3P H4P H5P H6P H7P

Out of outdoor temperture range

Out of indoor temperture range w c c c w x x w c c c x w x

In these cases, press the

BS1 MODE

button once and follow the procedure as described in "5 Final adjustment of the amount of refrigerant" on page 22.

In range:

The state of the leds will show:

H1P H2P H3P H4P H5P H6P H7P

w c c w w w w

Press the

BS1 MODE

button once. The procedure is completed.

Record the amount that was added on the additional refrigerant charge label provided with the unit and attach it on the back side of the front panel.

Perform the test procedure as described in "In case refrigerant was added by using the leak detection function" on page 25.

Installation manual

19

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

2

Adding refrigerant without using leak detection function

■

Charge with the outdoor unit at standstill

1.

Calculate how much refrigerant to be added using the formula explained in the chapter "How to calculate the additional refrigerant to be charged" on page 9.

2.

Open valve C (valves A and B and the stop valves must be left closed) and charge the required amount of refrigerant through the liquid side stop valve service port.

■

When the required amount of refrigerant is fully charged, close valve C. Record the amount of refrigerant that was added on the additional refrigerant charge label provided with the unit and attach it on the back side of the front panel.

Perform the test procedure as described in "In case refrigerant was added without using the leak detection function (pre-charging, charging in heating mode)" on page 26.

■

When the additional charging is not complete, perform the procedure explained in the chapter "Charge with operating outdoor unit" on page 20.

■

Charge with operating outdoor unit

Charge the refrigerant through valve A.

1.

Start of charging refrigerant manually

Open the liquid and gas side stop valves and the service port stop valve. (Valves A, B and C must be closed.)

Close all frontpanels except the electric box frontpanel and turn the power ON.

Make sure all indoor units are connected, refer to "11.3. How to check how many units are connected" on page 16.

If the H2P led is not flashing (in 12 minutes time after turning on the power), make sure it is displayed as shown below.

If the H2P led is flashing, check the malfunction code on the remote controller "4 Remote controller malfunction code display" on page 21.

2.

Press the

BS1 MODE

button once if the LEDs combination is not as in the figure below.

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

3.

Press the

BS4 TEST

button once.

H1P H2P H3P H4P H5P H6P H7P

w w w w w w w

4.

Hold the

BS4 TEST

button down for 5 seconds or more.

5.

Charging mode judgement

If the indoor temperature is 20°C DB or lower, charging in cooling mode is not possible in some cases. The unit will automatically select the cooling mode or heating mode for charging.

When charging in cooling mode, the unit will stop operating when the required amount of refrigerant is charged.

During charging in heating mode, a person must manually close valve A when complete charging is finished. Calculate how much refrigerant to be added using the formula explained in the chapter "How to calculate the additional refrigerant to be charged" on page 9.

For the cooling only models, heating mode can not be selected. In this case, the led disply will indicate out of range. Refer to the procedure as described in "5 Final adjustment of the amount of refrigerant" on page 22.

Continue with the manually charging in cooling mode OR in heating mode.

■

Charging in heating mode

6.

Start up

Wait while the unit is preparing for charging in heating mode.

Pressure control

(for the first minute)

Start up control

(for the next 2 minutes)

Waiting for stable heating conditions

(for the next ±15 minutes (according to the system))

H1P H2P H3P H4P H5P H6P H7P

x c x x x x w c c x c c x x x x w x x w w

7.

Ready

H1P H2P H3P H4P H5P H6P H7P

c c x x w x w

Press the

BS4 TEST

button once within 5 minutes.

If the

BS4 TEST

button is not pushed within 5 minutes,

P2

will be displayed on the remote controller. Refer to "4 Remote controller malfunction code display" on page 21.

8.

Operation

When the following led display is shown, open valve A and close the frontpanel. If the frontpanel is left open, the system can not operate properly during the refrigerant charging.

H1P H2P H3P H4P H5P H6P H7P

w c

* * * * *

*

= The state of this led is not important.

When a malfunction occurs, check the display of the remote controller and refer to "Remote controller malfunction code display" on page 21.

9.

Complete

If the calculated amount of refrigerant minus 10 kg is reached, close valve A and press the

BS3 RETURN

button once.

H1P H2P H3P H4P H5P H6P H7P

c c c w w w w

10. Press the

BS1 MODE

button once and the charging is complete.

Record the amount that was added on the additional refrigerant charge label provided with the unit and attach it on the back side of the front panel.

Perform the test procedure as described in "In case refrigerant was added without using the leak detection function (precharging, charging in heating mode)" on page 26.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

20

■

Charging in cooling mode

6.

Start up

Wait while the unit is preparing for charging in cooling mode.

Pressure control

(for the first minute)

Start up control

(for the next 2 minutes)

Waiting for stable heating conditions

(for the next ±15 minutes (according to the system))

H1P H2P H3P H4P H5P H6P H7P

x c x x x x w x c x x c x x x x w x x w w

7.

Ready

H1P H2P H3P H4P H5P H6P H7P

c c c x w x w

Press the

BS4 TEST

button once within 5 minutes.

If the

BS4 TEST

button is not pushed within 5 minutes,

P2

will be displayed on the remote controller. Refer to "4 Remote controller malfunction code display" on page 21.

8.

Operation

When the following led display is shown, open valve A and close the frontpanel. If the frontpanel is left open, the system can not operate properly during the refrigerant charging.

H1P H2P H3P H4P H5P H6P H7P

w c

* * * * *

*

= The state of this led is not important.

When a malfunction occurs, check the display of the remote controller and refer to "Remote controller malfunction code display" on page 21.

9.

Complete

If the display on the remote controller shows a flashing

PE

code, charging is almost finished.

When the unit stops operating, close valve A immediately and check the leds and check if the

P9

code is displayed on the remote controller.

H1P H2P H3P H4P H5P H6P H7P

w c c w w w w

If it is not as shown above, correct the malfunction (as indicated in the display of the remote controller) and restart the complete charging procedure. When the charging amount is little, the

PE

code may not be displayed, but instead the

P9

code will be displayed immediately.

10. Press the

BS1 MODE

button once and the charging is complete.

Record the amount that was added on the additional refrigerant charge label provided with the unit and attach it on the back side of the front panel.

Perform the test procedure as described in " In case refrigerant was added without using the leak detection function (charging in cooling mode)" on page 25.

3

Normal system display

LED display

(Default status before delivery)

Single outdoor unit system

Master unit

(a)

Multiple outdoor unit system

Slave unit

1

(a)

Slave unit

2

(a)

Microcomputer operation monitor

Mode

Ready

/Error

Individual

Cooling/Heating changeover

Bulk

(master)

Bulk

(slave)

Low noise Demand Multi

HAP H1P H2P H3P H4P H5P H6P H7P H8P

c x x w x x x x x c c c x x x x x x w x x x x x x x x x x x x x x w c x

(a) The state of the H8P (multi) LED in a multi-system shows wich unit is the master unit ( w ), slave 1 unit ( c ) or slave 2 unit ( x ).

Only the master unit is connected to the indoor units with interunit wiring.

4

Remote controller malfunction code display

Remote controller heating mode malfunction codes

Error code

P8

recharge operation

P2

charge hold

Close valve A immediately and press the TEST OPERATION button once.

The operation will restart from the charging mode judgement onwards.

Close valve A immediately. Check following items:

- Check if the gas side stop valve is opened correctly

- Check if the valve of the refrigerant cylinder is opened

- Check if the air inlet and outlet of the indoor unit are not obstructed

After correcting the abnormality, restart the automatic charging procedure again.

Remote controller cooling mode malfunction codes

Error code

PA

,

PH

, replace cylinder

PC

Close valve A and replace the empty cylinder. When renewed, open valve A (the outdoor unit will not stop operating).

The code on the display shows the unit where a cylinder is to be renewed:

PA

= master unit,

PH

= slave unit 1,

PC

= slave unit 2, flashing

PA

,

PH

and

PC

= all units

After recplacing the cylinder, open valve A again and continue the work.

Close valve A immediately.

Restart the automatic charging procedure again.

P8

recharge operation

P2

charge hold

* abnormal stop

Close valve A immediately. Check following items:

- Check if the gas side stop valve is opened correctly

- Check if the valve of the refrigerant cylinder is opened

- Check if the air inlet and outlet of the indoor unit are not obstructed

- Check if the indoor temperature is not lower than 20°C DB

Close valve A immediately. Confirm the malfunction code by the remote controller and correct the abnormality by following the "Correcting after abnormal completion of the test operation" on page 26.

After correcting the abnormality, restart the automatic charging procedure again.

Installation manual

21

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

5

Final adjustment of the amount of refrigerant

■

When the unit displays an out of temperature range, the automatic charging of refrigerant can not be completed.

■

Out of outdoor temperature range

H1P H2P H3P H4P H5P H6P H7P

w c c c w x x

Complete the charging of refrigerant on another time when the outdoor temperature is warmer than 0°C DB and colder than 43°C DB.

■

Out of indoor temperature range

H1P H2P H3P H4P H5P H6P H7P

w c c c x w x

Complete the charging of refrigerant on another time when the indoor temperature is warmer than 20°C DB and colder than 32°C DB.

In this case, perform a test operation (as explained in the chapter "12.4. Test operation" on page 25) and the unit will work properly. (The malfunction code

U3

will be displayed on the indoor unit.)

However, the refrigerant leak detection function can not be used before completing the refrigerant charging operation and the judgement of the initial amount of refrigerant by performing the test operation again.

■

When the temperature has come in range (outdoor = 0~43°C, indoor 20~32°C), perform the overcharging judgement procedure for completion of the refrigerant charging operation.

Overcharging judgement procedure

1

Close all the front panels except the electric box front panel and the lid on the side of the electric box.

2

Turn on the power to the outdoor unit and all the connected indoor units.

3

Press the

BS1 MODE

button once and set the setting model

H1P = OFF.

4

Press and hold the

BS4 TEST

button down for 5 seconds.

The system will start operating.

5

Close all the front panels.

automatically.

6

After the system has stopped operating, check the display on the remote controller.

7

If

E3

,

F6

or

UF

is displayed on the remote controller as a result of the overcharge judging operation, recover 20% of the charged amount of refrigerant and perform the overcharge judgement procedure again.

■

When there is no more overcharging of refrigerant detected, restart the automatic refrigerant charging from Start of automatic charging refrigerant as explained page 18 again.

11.5. Checks after adding refrigerant

■

Are the stop valves for both liquid and gas open?

■

Is the amount of refrigerant, that has been added, recorded?

Make sure to open the stop valves after charging the refrigerant.

Operating with the stop valves closed will damage the compressor.

12. B

EFORE OPERATION

12.1.

Service precautions

WARNING: ELECTRIC SHOCK

Caution when performing service to inverter equipment

1

Do not open the electric box cover for 10 minutes after the power supply is turned off.

2

Measure the voltage between terminals on the terminal block for power supply with a tester and confirm that the power supply is shut off.

In addition, measure the points, as shown in the figure below, with a tester and confirm that the voltage of the capacitor in the main circuit is less than 50 V DC.

TP1 TP2

A1P

A3P

3

To prevent damaging the PC-board, touch a noncoated metal part to eliminate static electricity before pulling out or plugging in connectors.

4

The performing of the service to the inverter equipment must be started after the junction connectors X1A, X2A,X3A, X4A (X3A and X4A are for

14~18 unit type only) for the fan motors in the outdoor unit are been pulled out. Be carefull not to touch the live parts.

(If a fan rotates due to strong wind, it may store electricity in the capacitor or in the main circuit and cause electric shock.)

5

After the service is finished, plug the junction connecter back in. Otherwise the error code

E7

will be displayed on the remote controller and normal operation will not be performed.

For details refer to the wiring diagram labeled on the back of the electric box cover.

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 and to remove the fuses from the control circuit located in the outdoor unit.

NOTE Play it safe!

For protection of the PCB, touch the switch box casing by hand in order to eliminate static electricity from your body before performing service.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

22

12.2. Checks before initial start-up

NOTE

Remark that during the first running period of the unit, required power input may be higher than stated on the nameplate of the unit. This phenomenon originates from the compressor that needs elapse of a 50 hours run in period before reaching smooth operation and stable power consumption.

■

Make sure that the circuit breaker on the power supply panel of the installation is switched off.

■

Attach the power wire securely.

■

Introducing power with a missing N-phase or with a mistaken N-phase will break the equipment.

After the installation, check the following before switching on the circuit breaker:

1

The position of the switches that require an initial setting

Make sure that switches are set according to your application needs before turning the power supply on.

2

Power supply wiring and transmission wiring

Use a designated power supply and transmission wiring and make sure that it has been carried out according to the instructions described in this manual, according to the wiring diagrams and according to local and national regulations.

3

Pipe sizes and pipe insulation

Make sure that correct pipe sizes are installed and that the insulation work is properly executed.

4

Air tight test and vacuum drying

Make sure the air tight test and vacuum drying were completed.

5

Additional refrigerant charge

The amount of refrigerant to be added to the unit should be written on the included "Added Refrigerant" plate and attached to the rear side of the front cover.

6

Insulation test of the main power circuit resistance of 2 M

Ω

or more is attained by applying a voltage of

500 V DC between power terminals and earth. Never use the megatester for the transmission wiring.

7

Installation date and field setting

Be sure to keep record of the installation date on the sticker on the rear of the upper front panel according to EN60335-2-40.

and keep record of the contents of the field setting.

12.3. Field setting

If required, carry out field settings according to the following instructions. Refer to the service manual for more details.

Opening the switch box and handling the switches

When carrying out field settings, remove the inspection cover (1).

Operate the switches with an insulated stick (such as a ball-point pen) to avoid touching live parts.

1

2

Location of the dip switches, leds and buttons

1

Led H1~8P

2

Push button switches

BS1~BS5

3

Dip switch 1 (DS1: 1~4)

4

Dip switch 2 (DS2: 1~4)

5

Dip switch 3 (DS3: 1~2)

1

2

4

3

5

Led state

Throughout the manual the state of the leds is indicated as follows: x

OFF w

ON c

Blinking

Setting the dip switches

(only in case of a heat pump unit)

1

2~4

1~4

1+2

What to set with dip switch DS1

COOL/HEAT selector (refer to "8.7. Field line connection: transmission wiring and cool/heat selection" on page 13)

(

OFF

= not installed = factory setting)

NOT USED

DO NOT CHANGE THE FACTORY SETTING.

What to set with dip switch DS2

NOT USED

DO NOT CHANGE THE FACTORY SETTING.

What to set with dip switch DS3

NOT USED

DO NOT CHANGE THE FACTORY SETTING.

Setting the push button switch (BS1~5)

Function of the push button switch which is located on the outdoor unit PCB (A1P):

MODE

TEST:

HWL: IND

C/H SELECT

MASTER SLAVE

L.N.O.P DEMAND

MULTI

H1P H2P

BS1

H3P

BS2

H4P

BS3

H5P

BS4

H6P

BS5

H7P H8P

MODE SET RETURN TEST RESET

BS1 MODE

BS2 SET

BS3 RETURN

BS4 TEST

BS5 RESET

For changing the set mode

For field setting

For field setting

For test operation

For resetting the address when the wiring is changed or when an additional indoor unit is installed

The figure shows state of the led indications when the unit is shipped from the factory.

Make sure to re-attach the inspection cover (1) into the switch box cover (2) after the job is finished.

NOTE

Make sure that all outside panels, except for the panel on the electric box, are closed while working.

Close the lid of the electric box firmly before turning on the power.

Installation manual

23

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Check operation procedure

1

Turn the power on for the outdoor unit and the indoor unit.

Be sure to turn the power on at least 6 hours before operation inorder to have power running to the crank case heater.

2

Make sure that transmission is normal by checking the LED display on the outdoor unit circuit board (A1P). (If transmission is normal, each LED will be displayed as shown below.)

LED display

(Default status before delivery)

Single outdoor unit system

Multiple outdoor unit system

Master unit

(a)

Slave unit

1

(a)

Slave unit

2

(a)

Microcomputer operation monitor

HAP

Cooling/Heating changeover

Mode

Ready

/Error

Individual

Bulk

(master)

Bulk

(slave)

Low noise Demand Multi

H1P H2P H3P H4P H5P H6P H7P H8P

c x x w x x x x x c c c x x x x x x w x x x x x x x x x x x x x x w c x

(a) The state of the H8P (multi) LED in a multi-system shows wich unit is the master unit ( w ), slave 1 unit ( c ) or slave 2 unit ( x ).

Only the master unit is connected to the indoor units with interunit wiring.

Setting the mode

The set mode can be changed with the

BS1 MODE

button according to the following procedure:

■

For setting mode 1: Press the

H1P led is off x

.

BS1 MODE

button once, the

■

For setting mode 2: Press the

5 seconds, the H1P led is on w

.

BS1 MODE

button for

If the H1P led is blinking c

and the

BS1 MODE

button is pushed once, the setting mode will change to setting mode 1.

NOTE

If you get confused in the middle of the setting process, push the

BS1 MODE

button. Then it returns to setting mode 1 (H1P led is off).

Setting mode 1

The H1P led is off (COOL/HEAT selection setting).

Setting procedure

1

Push the

BS2 SET

button and adjust the led indication to either one of the possible settings as shown below in the field marked

:

1

In case of COOL/HEAT setting by each individual outdoor unit circuit.

2

In case of COOL/HEAT setting by the master unit when outdoor units are connected in multiple system-combination

(a)

.

3

In case of COOL/HEAT setting by the slave unit when outdoor units connected in multiple system-combination

(a)

.

1

2

3

H1P H2P H3P H4P H5P H6P H7P

x x c x x x x x x x c x x x x x x x c x x

(a) It is necessary to use the optional external control adapter for outdoor unit

(DTA104A61/62). See the instruction delivered with the adapter.

2

Push the

BS3 RETURN

button and the setting is defined.

Setting mode 2

The H1P led is on.

Setting procedure

1

Push the

BS2 SET

button according to the required function

(A~H). The led indication that matches the required function is shown below in the field marked :

Possible functions

A

additional refrigerant charging operation.

B

refrigerant recovery operation/vacuuming operation.

C

setting of high static pressure.

D

automatic low noise operation setting at nighttime.

E

low noise operation level setting ( control adapter.

L.N.O.P

) via the external

F

power consumption limitation setting ( control adapter.

DEMAND

) via the external

G

enabling function of the low noise operation level setting

(

L.N.O.P

) and/or power consumption limitation setting

(

DEMAND

) via the external control adapter (DTA104A61/62).

H

check operation (without initial refrigerant decision)

A

B

C

D

E

F

G

H

H1P H2P H3P H4P H5P H6P H7P

w x w x w x x w x w x w x w w x w x x w x w x w x w w x w x w w x x w w x w w w w x w x x w w x x w x x x x w w

2

When the

BS3 RETURN

button is pushed, the current setting is defined.

3

Push the

BS2 SET

button according to the required setting possibility as shown below in the field marked .

3.1 Possible settings for function A, B, C, G and H are

ON

(ON) or

OFF

(OFF).

ON

OFF

(a)

H1P H2P H3P H4P H5P H6P H7P

w x x x x c x w x x x x x c

(a) This setting = factory setting

3.2 Possible settings for function D

The noise of level 3 < level 2 < level 1 (

1

).

OFF

(a)

1

2

3

H1P H2P H3P H4P H5P H6P H7P

w x x x x x x w x x x x x c w x x x x c x w x x x x c c

(a) This setting = factory setting

3.3 Possible settings for function E and F

For function E

(

L.N.O.P

) only: the noise of level 3 < level 2

< level 1 (

1

).

For function F

(

DEMAND

) level 1< level 2 < level 3 ( only: the power consumption of

3

).

1

2

(a)

3

H1P H2P H3P H4P H5P H6P H7P

w x x x x x c w x x x x c x w x x x c x x

(a) This setting = factory setting

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

24

4

Push the

BS3 RETURN

button and the setting is defined.

5

When the

BS3 RETURN

button is pushed again, the operation starts according to the setting.

Refer to the service manual for more details and for other settings.

Confirmation of the set mode

The following items can be confirmed by setting mode 1 (H1P led is off)

Check the led indication in the field marked .

1

Indication of the present operation state

x

, normal

-

w

, abnormal c

, under preparation or under test operation

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

2

Indication of COOL/HEAT selection setting

1

When set to COOL/HEAT change-over by each individual outdoor unit circuit (= factory setting).

2

Indication on master unit when COOL/HEAT change-over is carried out by outdoor system connected in multiple systemcombination.

3

Indication on slave unit when COOL/HEAT change-over is carried out by outdoor system connected in multiple system-combination.

2

3

1

(a)

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x x x x w x x x x x x x w x x

(a) This setting = factory setting.

3

Indication of low noise operation state

L.N.O.P

-

x standard operation (= factory setting) w

L.N.O.P

operation

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

4

Indication of power consumption limitation setting

DEMAND

-

x

standard operation (= factory setting) w

DEMAND

operation

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x

12.4. Test operation

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.

Do not perform the test operation while working on the indoor units.

When performing the test operation, not only the outdoor unit, but the connected indoor unit will operate as well.

Working on a indoor unit while performing a test operation is dangerous.

In case refrigerant was added by using the leak detection function

■

In the check operation, the following checks and judgements will be performed:

■

Check of the stop valve opening

■

Check for wrong wiring

■

Judgement of piping length

■

Judgement of initial refrigerant state

■

It takes ±3 hours (if the outdoor temperature is low, it takes

±4 hours) to complete the check operation.

■

The system can not perform the judgement of initial refrigerant state in the following cases:

■

The outdoor temperature is out of range

(<0°C DB or >43°C DB)

■

The indoor temperature is out of range

(<20°C DB or >32°C DB)

■

A forced OFF during the test operation

In this case, after performing the check operation, normal operation is possible although the abnormality code

U3

is displayed on the indoor remote controller and the refrigerant leakage detection function can not be used.

Perform the check operation again and complete the judgement of initial refrigerant state.

Perform the test operation as decribed in the paragraph "Test operation procedure" on page 26.

In case refrigerant was added without using the leak detection function (charging in cooling mode)

■

In the check operation, the following checks and judgement will be performed:

■

Check of the stop valve opening

■

Check for wrong wiring

■

Judgement of piping length

■

It takes ±30 minutes to complete the check operation.

Check operation procedure

1

Close the electric box lid and all front panels except the one on the side of the electric box.

2

Turn on the power to the outdoor unit and all connected indoor units. Be sure to turn the power ON at least 6 hours before operation in order to have power running to the crank case heater.

3

Make the field setting as needed using the push buttons on the

PCB (A1P) of the outdoor unit. Refer to "Field setting" on page 23.

Installation manual

25

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

4

Set the check operation (without initial refrigerant decision) following setting mode 2 in the field setting and perform the check operation.

The system operates for ±30 minutes and automatically stops the check operation.

■

If no malfunction code is displayed on the remote controller after the system has stopped, check if the operation is completed. Normal operation will be possible after 5 minutes.

■

If a malfunction code is displayed on the remote controller, correct the malfunction and perform the check operation again as decribed in "Correcting after abnormal completion of the test operation" on page 26

In case refrigerant was added without using the leak detection function (pre-charging, charging in heating mode)

■

In the check operation, the following checks and judgement will be performed:

■

Check of the stop valve opening

■

Check for wrong wiring

■

Check of refrigerant overcharge

■

Judgement of piping length

■

It takes ±40 minutes to complete the check operation.

Perform the test operation as decribed in the paragraph "Test operation procedure" on page 26.

Test operation procedure

1

Close all front panels except the front panel of the electric box.

2

Turn ON the power to all outdoor units and the connected indoor units.

Be sure to turn on the power 6 hours before operation in order to have power running to the crank case heater and to protect the compressor.

3

Make the field setting as described in the paragraph "12.3. Field setting" on page 23.

4

Press the

BS1 MODE

button once, and set to the SETTING

MODE (H1P led = OFF).

5

Press and hold the

BS4 TEST

button down for 5 seconds or more. The unit will start the test operation.

■

The test operation is automatically carried out in cooling mode, the H2P led will light up and the messages "Test operation" and "Under centralized control" will display on the remote controller.

■

It may take 10 minutes to bring the state of the refrigerant uniform before the compressor starts.

■

During the test operation, the refrigerant running sound or the magnetic sound of a solenoid valve may become loud and the led display may change, but these are not malfunctions.

■

During the test operation, it is not possible to stop the unit operation from a remote controller. To abort the operation, press the

BS3 RETURN

button. The unit will stop after

±30 seconds.

6

Close the front panel in order to let it not be the cause of misjudgement.

7

Check the test operation results by the led display on the outdoor unit.

Normal completion

Abnormal completion

H1P H2P H3P H4P H5P H6P H7P

x x w x x x x x w w x x x x

8

When the test operation is fully completed, normal operation will be possible after 5 minutes.

Otherwise, refer to "Correcting after abnormal completion of the test operation" on page 26 to take actions for correcting the abnormality.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Correcting after abnormal completion of the test operation

The test operation is only completed if there is no malfunction code displayed on the remote controller. In case of a displayed malfunction code, perform the following actions to correct the abnormality:

■

Confirm the malfunction code on the remote controller

Installation error

The stop valve of an outdoor unit is left closed.

Error code

E3

E4

F3

UF

U1

Remedial action

Check referring to the table in

"Additional refrigerant charge" on page 17

The phases of the power to the outdoor units are reversed.

No power is supplied to an outdoor or indoor unit (including phase interruption).

Incorrect interconnections between units

Refrigerant overcharge

For the U-5~18MX4, the wiring is connected to the

Q1/Q2 (Out Multi)

Insufficient refrigerant

U1

U4

UF

E3

F6

UF

U7

UF

E4

F3

Exchange two of the three phases

(L1, L2, L3) to make a positive phase connection.

Check if the power wiring for the outdoor units are connected correctly.

(If the power wire is not connected to L2 phase, no malfunction display will appear and the compressor will not work.)

Check if the refrigerant line piping and the unit wiring are consistent with each other.

Recalculate the required amount of refrigerant from the piping length and correct the refrigerant charge level by recovering any excessive refrigerant with a refrigerant recovery machine.

Remove the wiring from the Q1/Q2

(Out Multi).

Check if the additional refrigerant charge has been finished correctly.

Recalculate the required amount of refrigerant from the piping length and add an adequate amount of refrigerant.

■

After correcting the abnormality, press the

BS3 RETURN

button and reset the malfunction code.

■

Carry out the test operation again and confirm that the abnormality is properly corrected.

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26

13. S

ERVICE MODE OPERATION

Vacuuming method

At the first installation, this vacuuming is not required. It is required only for repair purposes.

1

When the unit is at standstill and under the setting mode 2, set the required function B (refrigerant recovery operation/ vacuuming operation) to

ON

(ON).

After this is set, do not reset the setting mode 2 until the vacuuming is finished.

The H1P led is on and the remote controller indicates

(test operation) and (external control) and the operation will be prohibited.

2

Evacuate the system with a vacuum pump.

3

Press the

BS1 MODE

button and reset the setting mode 2.

Refrigerant recovery operation method

by a refrigerant reclaimer

1

When the unit is at standstill and under the setting mode 2, set the required function B (refrigerant recovery operation/ vacuuming operation) to

ON

(ON).

The indoor unit and the outdoor unit expansion valves will fully open and some solenoid valves will be turned on.

The H1P led is on and the remote controller indicates

(test operation) and (external control) and the operation will be prohibited.

2

Cut off the power supply to the indoor units and the outdoor unit with the circuit breaker. After the power supply to one side is cut off, cut off the power supply to the other side within 10 minutes.

Otherwise, the communication between the indoor and outdoor unit may become abnormal and the expansion valves will be completely closed again.

3

Recover the refrigerant by a refrigerant reclaimer. For details, see the operation manual delivered with the refrigerant reclaimer.

14. C

AUTION FOR REFRIGERANT LEAKS

Introduction

The installer and system specialist shall secure safety against leakage according to local regulations or standards. The following standards may be applicable if local regulations are not available.

This system uses R410A as refrigerant. R410A itself is an entirely safe non-toxic, non-combustible refrigerant. Nevertheless care must be taken to ensure that air conditioning facilities are installed in a room which is sufficiently large. This assures that the maximum concentration level of refrigerant gas is not exceeded, in the unlikely event of major leak in the system and this in accordance to the local applicable regulations and standards.

Maximum concentration level

The maximum charge of refrigerant and the calculation of the maximum concentration of refrigerant is directly related to the humanly occupied space in to which it could leak.

The unit of measurement of the concentration is kg/m

3

(the weight in kg of the refrigerant gas in 1 m

3

volume of the occupied space).

Compliance to the local applicable regulations and standards for the maximum allowable concentration level is required.

According to the appropriate European Standard, the maximum allowed concentration level of refrigerant to a humanly space for

R410A is limited to 0.44 kg/m

3

.

1

2

1

2

direction of the refrigerant flow room where refrigerant leak has occurred (outflow of all the refrigerant from the system)

Pay special attention to places, such as a basements, etc. where refrigerant can stay, since refrigerant is heavier than air.

Procedure for checking maximum concentration

Check the maximum concentration level in accordance with steps 1 to 4 below and take whatever action is necessary to comply.

1

Calculate the amount of refrigerant (kg) charged to each system separately.

amount of refrigerant in a single unit system

(amount of refrigerant with which the system is charged before leaving the factory)

+ additional charging amount (amount of refrigerant added locally in accordance with the length or diameter of the refrigerant piping)

= total amount of refrigerant (kg) in the system

NOTE

Where a single refrigerant facility is divided into

2 entirely independent refrigerant systems, use the amount of refrigerant with which each separate system is charged.

Installation manual

27

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

2

Calculate the smallest room volume (m

3

)

In a case such as the following, calculate the volume of (A), (B) as a single room or as the smallest room.

A.

Where there are no smaller room divisions

N

OTES

B.

Where there is a room division but there is an opening between the rooms sufficiently large to permit a free flow of air back and forth.

1

2

1

2

opening between rooms partition

(Where there is an opening without a door or where there are openings above and below the door which are each equivalent in size to 0.15% or more of the floor area.)

3

Calculating the refrigerant density using the results of the calculations in steps 1 and 2 above.

total volume of refrigerant in the refrigerant system size (m

3

) of smallest room in which there is an indoor unit installed

≤ maximum concentration level

(kg/m

3

)

If the result of the above calculation exceeds the maximum concentration level then make similar calculations for the second then third smallest room and so until the result falls short of the maximum concentration.

4

Dealing with the situations where the result exceeds the maximum concentration level.

Where the installation of a facility results in a concentration in excess of the maximum concentration level then it will be necessary to revise the system.

Please consult your supplier.

15. D

ISPOSAL REQUIREMENTS

Dismantling of the unit, treatment of the refrigerant, of oil and of other parts must be done in accordance with relevant local and national legislation.

U-5~18MX4XPQ

Urban Multi air conditioner

4PW28163-1

Installation manual

28

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