Panasonic U-5ML5DPQ User manual

Installation manual
Urban Multi air conditioner
English
Installationsanleitung
Urban Multi Klimaanlage
Deutsch
Manuel d'installation
Unité extérieure Urban Multi
Français
Montagehandleiding
Urban Multi airconditioner
Nederlands
Manual de instalación
Acondicionador de aire Urban Multi
Español
Manuale d'installazione
Climatizzatore Urban Multi
Italiano
∂Á¯ÂÈÚ›‰ÈÔ ÂÁηٿÛÙ·Û˘
KÏÈÌ·ÙÈÛÙÈÎfi Urban Multi
EÏÏËÓÈο
Manual de instalação
Ar condicionado Urban Multi
Portugues
U-4ML5DPQ
U-5ML5DPQ
U-6ML5DPQ
U-4ML5XPQ
U-5ML5XPQ
U-6ML5XPQ
INSTALLATION MANUAL
URBAN MULTI AIR CONDITIONER
4PW40731-1 Page 1 Thursday, October 11, 2007 9:16 AM

3
3
1
1
1
2 3
4
3
AA
B2
B2
B2
CC
D1
D1
D1
D2D2
D2D2
D2
EE
HH
L1
L1
L1
L2
L2
L2
AA
B1
B1
B1
B1
B1
B1
B2
B2
B2
CC
D1
D1
D1
D2D2
D2D2
D2
EE
HH
L1
L1
L1
L2
L2
L2
1+2
3
≥100
≥100
≥150 ≥150
L2>H
L2>H
L1≤H
L1≤H
L1≤H
L2≤H
L2≤H
0<L1≤1/2 H
1/2 H<L1≤H
H<L1
L2≤H
H<L2
L1≤H
H<L1
L2≤H
H<L2
0<L2≤1/2 H
1/2 H<L2≤H
0<L2≤1/2 H
1/2 H<L2≤H
0<L1≤1/2 H
1/2 H<L1≤H
0<L2≤1/2 H
1/2 H<L2≤H
L2<H
L2<H
L2>H
L2<H
L2>H
L2<H
≥150
≥500
≥500
≥500
≥500
≥750
≥100
≥100
≥100
≥100
≥200
≥300≥200
≥100
≥250
≥250
≤500 ≥1000
≥1000
≥1000
≤500
≤500
≤500
≤500
≥1000
≥1000
≥1000
≥1000
≤500
≤500
≥1000
≤500 ≥1000
≥1000
≥300
≥300
≥300
≥250
≥300
≥300 ≤500
≥200 ≥1000
≥1000
≥1000
≥1000
≥1000
≥1250
≥1500
≥1500
≥1000
≥1000
≥100
5
44
321 78
910
A
D
C
B
5 611
7
6
1
2
3
4
56
7
9
8
12
13
10
1111
≥1500
1
3
5
4
2
2
(mm)
63
≥1000
≥1000
≥1000
≥1500
≥1500
≥1500
1
2
2
3
A
B
C
1
12
3
4
5
6
7
4PW40731-1 Page 1 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
1
C
ONTENTS
Page
1. Safety considerations.................................................................1
2. Introduction ................................................................................2
2.1. Combination ................................................................................... 2
2.2. Standard supplied accessories ......................................................2
2.3. Optional accessories...................................................................... 2
2.4. Technical and electrical specifications ........................................... 2
3. Before installation ......................................................................3
3.1. Precautions for R410A ................................................................... 3
3.2. Installation ...................................................................................... 3
3.3. Handling ......................................................................................... 3
4. Selecting installation site............................................................3
5. Precautions on installation.........................................................4
5.1. Installation method for prevention of falling over ............................4
5.2. Method for removing transportation stay........................................ 4
5.3. Method for installing drain piping.................................................... 4
6. Installation servicing space........................................................5
7. Refrigerant pipe size and allowable pipe length.........................5
7.1. Selection of piping material ............................................................ 6
8. Precautions on refrigerant piping...............................................6
8.1. Cautions for brazing .......................................................................6
8.2. Cautions for flare connection.......................................................... 6
9. Refrigerant piping.......................................................................7
9.1. Preventing foreign objects from entering........................................ 7
9.2. Cautions for handling stop valve ....................................................7
9.3. How to use the stop valve ..............................................................8
9.4. Cautions for handling the valve cover............................................. 8
9.5. Cautions for handling service port.................................................. 8
9.6. Precautions when connecting field piping and
regarding insulation ........................................................................ 8
9.7. Leak test and vacuum drying .......................................................10
10. Additional refrigerant charge....................................................10
10.1. Important information regarding the refrigerant used................... 10
10.2. 3 procedures for adding refrigerant.............................................. 11
11. Electrical wiring work ...............................................................13
11.1. Internal wiring – Parts table..........................................................13
11.2. Precautions on electrical wiring work ........................................... 14
11.3. Connection example of total system wiring.................................. 14
11.4. Connecting power wire and transmission wires ........................... 15
11.5. Power circuit and cable requirements .......................................... 15
12. Before operation ......................................................................17
12.1. Service precautions...................................................................... 17
12.2. Checks before initial start-up........................................................17
12.3. Field setting .................................................................................. 17
12.4. Test operation............................................................................... 19
12.5. Checks in normal operation.......................................................... 20
12.6. Temperature adjustment operation confirmation.......................... 20
13. Service mode operation...........................................................21
14. Caution for refrigerant leaks.....................................................21
14.1. Introduction................................................................................... 21
14.2. Maximum concentration level....................................................... 21
14.3. Procedure for checking maximum concentration .........................21
15. Disposal requirements .............................................................22
1. S
AFETY CONSIDERATIONS
The precautions listed here are divided into the following two types.
Both cover very important topics, so be sure to follow them carefully.
Warning
■ Ask your dealer or qualified personnel to carry out installation
work. Do not install the machine by yourself.
Improper installation may result in water leakage, electric shocks
or fire.
■ Perform installation work in accordance with this installation
manual.
Improper installation may lead to water leakage, electric shocks
or fire.
■ When a unit is installed in a small room, it is necessary to take
measures so that the leaked refrigerant amount does not exceed
the limit even if it leaks. As for the measures to prevent the leak
from not exceeding the limit, please consult with your distributor.
If the leaked amount exceeds the limit, it may cause an oxygen
deficiency accident.
■ Be sure to use only the specified accessories and parts for
installation work.
Failure to use the specified parts may result in water leakage,
electric shocks, fire, or the unit falling.
■ Install the air conditioner on a foundation that can withstand its
weight.
Insufficient strength may result in the fall of equipment and
causing injury.
■ Carry out the specified installation work in consideration of strong
winds, typhoons, or earthquakes.
Improper installation work may result in accidents due to fall of
equipment.
U-4ML5DPQ U-4ML5XPQ
U-5ML5DPQ U-5ML5XPQ
U-6ML5DPQ U-6ML5XPQ
Urban Multi air conditioner
Installation manual
READ THESE INSTRUCTIONS CAREFULLY BEFORE
INSTALLATION. KEEP THIS MANUAL IN A HANDY
PLACE 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".
WARNING
If the warning is not observed, it may cause serious casualties.
CAUTION
If the caution is not observed, it may cause injury or damage to the
equipment.
4PW40731-1 Page 1 Thursday, October 11, 2007 9:16 AM

Installation manual
2
U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
■ Make certain that all electrical work is carried out by qualified
personnel according to the local laws and regulations and this
installation manual, using a separate circuit.
Insufficient capacity of the power supply circuit or improper
electrical construction may lead to electric shocks or fire.
■ Make sure that all wiring is secure, using the specified wires and
ensuring that external forces do not act on the terminal
connections or wires.
Incomplete connection or fixing may cause a fire.
■ When wiring between the indoor and outdoor units, and wiring
the power supply, form the wires so that the frontside panel can
be securely fastened.
If the frontside panel is not in place, the terminals may overheat
and electric shocks or a fire may be caused.
■ If refrigerant gas leaks during installation work, ventilate the
area immediately.
Toxic gas may be produced if refrigerant gas comes into contact
with fire.
■ After completing the installation work, check to make sure that
there is no leakage of refrigerant gas.
Toxic gas may be produced if refrigerant gas leaks into the room
and comes into contact with a source of fire, such as a fan
heater, stove or cooker.
■ Before touching electric terminal parts, turn off power switch.
Caution
■ Ground the air conditioner.
Grounding resistance should be according to national
regulations
Do not connect the earth wire to gas or water pipes,
lightning conductor or telephone earth wire.
Incomplete grounding may cause electric shocks.
■ Gas pipe.
Ignition or explosion may occur if the gas leaks.
■ Water pipe.
Hard vinyl tubes are not effective grounds.
■ Lightning conductor or telephone ground wire.
Electric potential may rise abnormally if struck by a lightning
bolt.
■ Be sure to install an earth leakage breaker.
Failure to install an earth leakage breaker may cause electric
shocks or fire.
■ Install drain piping according to this installation manual to
ensure good drainage, and insulate the pipe to prevent
condensation.
Improper drain piping may cause water leakage, and make the
furniture get wet.
■ Install the indoor and outdoor units, power wire and connecting
wire at least 1 meter away from televisions or radios to prevent
image interference or noise.
(Depending on the radio waves, a distance of 1 meter may not
be sufficient to eliminate the noise.)
■ Do not rinse the outdoor unit.
This may cause electric shocks or fire.
■ Do not install the air conditioner in places such as the following:
■ Where there is mist of mineral oil, oil spray or vapour for
example a kitchen.
Plastic parts may deteriorate, and cause them to fall out or
water to leak.
■ Where corrosive gas, such as sulfurous acid gas, is
produced.
Corrosion of copper pipes or soldered parts may cause the
refrigerant to leak.
■ Where there is machinery which emits electromagnetic
waves.
Electromagnetic waves may disturb the control system, and
cause malfunction of the equipment.
■ Where flammable gases may leak, where carbon fiber or
ignitable dust is suspended in the air or where volatile
flammables, such as thinner or gasoline, are handled.
Such gases may cause a fire.
■ Where the air contains high levels of salt such as that near
the ocean.
■ Where voltage fluctuates a lot, such as that in factories.
■ In vehicles or vessels.
■ Where acidic or alkaline vapour is present.
■ Do not allow a child to mount on the outdoor unit or avoid
placing any object on the unit.
Falling or tumbling may result in injury.
■ Do not touch any refrigerant which has leaked out of refrigerant
piping connections.
This may result in frostbite.
2. I
NTRODUCTION
2.1. 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.
■ Total capacity/number of indoor units
2.2. Standard supplied accessories
Location of accessories: refer to figure 1.
2.3. 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.)
To select an optimum refrigerant branching kit, refer to "Refrigerant
branch kit selection" on page 9.
2.4. Technical and electrical specifications
Refer to the Engineering Data Book for the complete list of
specifications.
Outdoor unit Total capacity of
indoor units Total number of indoor units
U-4ML5 50~130 6
U-5ML5 62.5~162.5 8
U-6ML5 70~182 9
Gas line piping (1)
(*)
+ copper gasket
(*) Only for U-6ML5.
1
Gas line piping (2)(*) 1
Gas line piping (3)(*) 1
Installation manual
Operation manual 1 1
1 Accessories
Refnet header Refnet joint
CZ-P29HK12Q CZ-P20BK12Q
+
4PW40731-1 Page 2 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
3
3. B EFORE INSTALLATION
3.1. Precautions for R410A
■ The refrigerant requires strict cautions for keeping the system
clean, dry and tight.
- Clean and dry
Foreign materials (including mineral oils or moisture) should be
prevented from getting mixed into the system.
- Tight
Read "8. Precautions on refrigerant piping" on page 6 carefully
and follow these procedures correctly.
■ Since R410A is a mixed refrigerant, the required additional
refrigerant must be charged in its liquid state. (If the refrigerant
is in state of gas, its composition changes and the system will
not work properly).
■ The connected indoor units must be indoor units designed
exclusively for R410A.
3.2. Installation
■ For installation of the indoor unit(s), refer to the indoor unit
installation manual.
■ Never operate the air conditioner with the discharge pipe
thermistor (R2T), suction pipe thermistor (R3T) and pressure
sensors (S1NPH, S1NPL) removed. Such operation may burn
out the compressor.
■ Be sure to confirm the model name and the serial no. of the
outer (front) plates when attaching/detaching the plates to avoid
mistakes.
■ When closing the service panels, take care that the tightening
torque does not exceed 4.1 N•m.
3.3. Handling
As shown in the figure, bring the unit slowly by grabbing the left and
right grips.
Place your hands on the corner instead of holding the suction inlet in
the side of the casing, otherwise the casing could be deformed.
4. S
ELECTING INSTALLATION SITE
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.
1 Select an installation site where the following conditions are
satisfied and that meets with your customer's approval.
- Places which are well-ventilated.
- Places where the unit does not bother next-door neighbours.
- Safe places which can withstand the unit's weight and
vibration and where the unit can be installed level.
- Places where there is no possibility of flammable gas or
product leak.
- Places where servicing space can be well ensured.
-Places where the indoor and outdoor units' piping and wiring
lengths come within the allowable ranges.
- Places where water leaking from the unit cannot cause
damage to the location (e.g. in case of a blocked drain pipe).
- Places where the rain can be avoided as much as possible.
2 When installing the unit in a place exposed to strong wind, pay
special attention to the following.
Strong winds of 5 m/sec or more blowing against the outdoor
unit's air outlet causes short circuit (suction of discharge air),
and this may have the following consequences:
- Deterioration of the operational capacity.
-Frequent frost acceleration in heating operation.
- Disruption of operation due to rise of high pressure.
- When a strong wind blows continuously on the face of the
unit, the fan can start rotating very fast until it breaks.
Refer to the figures for installation of this unit in a place where
the wind direction can be foreseen.
■ Turn the air outlet side toward the building's wall, fence or
screen.
■ Set the outlet side at a right angle to the direction of the wind.
3 Prepare a water drainage channel around the foundation, to
drain waste water from around the unit.
4 If the water drainage of the unit is not easy, please build up the
unit on a foundation of concrete blocks, etc. (the height of the
foundation should be maximum 150 mm).
5 If you install the unit on a frame, please install a waterproof plate
within 150 mm of the underside of the unit in order to prevent the
invasion of water from the lower direction.
6 When installing the unit in a place frequently exposed to snow,
pay special attention to the following:
- Elevate the foundation as high as possible.
- Construct a large canopy (field supply).
- Remove the rear suction grille to prevent snow from
accumulating on the rear fins.
Since design pressure is 4.0 MPa or 40 bar, pipes of larger
wall thickness may be required. Refer to paragraph
"7.1. Selection of piping material" on page 6.
Take care not to let hands or objects come in contact with
rear fins.
■ 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.
Strong wind
Blown air Strong wind
Make sure there is enough room to do the installation
4PW40731-1 Page 3 Thursday, October 11, 2007 9:16 AM

Installation manual
4
U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
7 The outdoor unit may short circuit depending on its environment,
so use the louvers (field supply).
8 If you install the unit on a building frame,
please install a waterproof plate (within
150 mm of the underside of the unit) or
use a drain plug kit (option) in order to
avoid the drain water dripping.
5. P RECAUTIONS ON INSTALLATION
■ Check the strength and level of the installation ground so that
the unit will not cause any operating vibration or noise after
installation.
■ In accordance with the foundation drawing in the figure, fix the
unit securely by means of the foundation bolts. (Prepare four
sets of M12 foundation bolts, nuts and washers each which are
available on the market.)
■ It is best to screw in the foundation bolts until their length are
20 mm from the foundation surface.
5.1. Installation method for prevention of falling over
If it is necessary to prevent the unit from falling over, install as shown
in the figure.
■ prepare all 4 wires as indicated in the drawing
■ unscrew the top plate at the 4 locations indicated A and B
■ put the screws through the nooses and screw them back tight
A location of the 2 fixation holes on the front side of the unit
B location of the 2 fixation holes on the rear side of the unit
C wires: field supply
5.2. Method for removing transportation stay
The yellow transportation stay installed over the compressor leg for
protecting the unit during transport must be removed. Proceed as
shown in figure 3 and described below.
1 Slightly loosen the fixing nut (B).
2 Remove the transportation stay (C) as shown in figure 3.
3 Tighten the fixing nut (B) again.
5.3. Method for installing drain piping
Depending on installation site, it may be required to install drain plug
for drainage (option kit).
In cold areas, do not use a drain hose with the outdoor unit.
Otherwise, drain water may freeze, impairing the heating
performance.
1 See figure below for installation of the drain plug.
2 Connect a field supplied vinyl hose (internal diameter of 25 mm)
to the drain socket (A).
If the hose is too long and hangs down, fix it carefully to prevent
kinks.
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)
In extreme circumstances you should keep distances of
3 m or more and use conduit tubes for power and
transmission lines.
A Discharge side
B Bottom view (mm)
C Drain hole
1Personal computer or radio
2Fuse
3Earth leakage breaker
4Remote controller
5Cool/heat selector
6Indoor unit
20
140
117
219
289
350
(345-355)
45
140620
612
421
A
B
C
A Compressor
B Fixing nut
C Transportation stay
CAUTION
If the unit is operated with the transportation stay attached,
abnormal vibration or noise may be generated.
A Drain socket
B Drain cap
C Drain receiver
D Insulation tape
C
B
AA
4PW40731-1 Page 4 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
5
6. I
NSTALLATION SERVICING SPACE
■ The connection piping outlet direction in the installation shown in
figure 4 is frontward or downward. The unit of numeric values is
mm.
■ When routing the piping backward, secure space of ≥ 250 mm on
the right side of the unit.
(A) In case of non-stacked installation (See figure 4)
(B) In case of stacked installation
1. In case obstacles exist in front of the outlet side.
2. In case obstacles exist in front of the air inlet.
(C) In case of multiple-row installation (for roof top use, etc.)
1. In case of installing one unit per row.
2. In case of installing multiple units (2 units or more) in lateral
connection per row.
Relation of dimensions between H, A and L is shown in the table
below.
7. R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH
NOTE If drain holes of the outdoor unit are covered by a
mounting base or by floor surface, raise the unit in
order to provide a free space of more than 100 mm
under the outdoor unit.
Suction side obstacle 1In these cases, close the
bottom of the installation
frame to prevent the
discharged air from
being bypassed
Discharge side obstacle
Left side obstacle 2In these cases, only 2
units can be installed.
Right side obstacle 3In these cases, no
restriction of height L1.
Top side obstacle This situation is not
allowed
✓Obstacle is present
NOTE ■Do not stack more than one unit.
■About 100 mm is required as the dimension
for laying the upper outdoor unit's drain pipe.
■Get the portion A sealed so that air from the
outlet does not bypass.
≥1
000
100
A
≥300
100
A
L A
L≤H0<L≤1/2H 250
1/2H<L≤H 300
H<L Installation impossible
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
To persons in charge of piping work:
■Be sure to open the stop valve after piping installing
and vacuuming is complete. (Running the system with
the valve closed may break the compressor.)
■It is forbidden to discharge refrigerant into the
atmosphere. Collect the refrigerant in accordance
with the freon collection and destruction law.
■Do not use flux when brazing the refrigerant piping.
For brazing, use phosphor copper brazing filler metal
(BCuP) which does not require a flux.
(If a chlorine flux is used, the piping will corrode, and if
the flux contains fluoride, it will cause the coolant oil to
deteriorate, adversely affecting the coolant piping
system.
≥1
000
≥2
00
≥2
000
≥100
≥1500
≥600
≥3000
A
H
L
4PW40731-1 Page 5 Thursday, October 11, 2007 9:16 AM

Installation manual
6U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
7.1. Selection of piping material
■Foreign materials inside pipes (including oils for fabrication)
must be ≤30 mg/10 m.
■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 table below.
■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.
O = Annealed
1/2H = Half hard
■Make sure to use the particular branches of piping that have
been selected.
■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).
8. PRECAUTIONS ON REFRIGERANT PIPING
■Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
■Use R410A only when adding refrigerant
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
and moisture) from mixing into the system.
Vacuum pump:
Use a 2-stage vacuum pump with a non-return valve
Make sure the pump oil does not flow oppositely into the system
while the pump is not working.
Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr,
–755 mm Hg).
■In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Great caution is needed when passing copper tubes through
walls.
■For handling of stop valves, refer to "9.3. How to use the stop
valve" on page 8.
■Only use the flare nuts included with the unit. Using different
flare nuts may cause the refrigerant to leak.
■Always use the supplied copper gasket when connecting the
gas pipe supplied with the unit. See "9. Refrigerant piping" on
page 7.
8.1. Cautions for brazing
■Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out 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.
■When brazing while inserting nitrogen into the piping, nitrogen
must be set to 0.02 MPa with a pressure-reducing valve (=just
enough so that it can be felt on the skin).
8.2. Cautions for flare connection
■See the following table for flare part machining dimensions.
■When connecting the flare nuts, apply refrigerant ether or ester
oil to the inside and outside of the flares and turn them three or
four times at first.
■When loosening a flare nut, always use two wrenches in
combination. When connecting the piping, always use a spanner
and torque wrench in combination to tighten the flare nut.
■See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
■After all the piping has been connected, use nitrogen to perform
a gas leak check.
Pipe Ø Temper grade of piping
material Minimal thickness t (mm)
6.4 / 9.5 / 12.7 O 0.80
15.9 O 1
19.1 1/2H 1
Installation period Protection method
More than a month Pinch the pipe
Less than a month Pinch or tape the
pipe
Regardless of the
period
1Refrigerant piping
2Part to be brazed
3Taping
4Hands valve
5Pressure-reducing valve
6Nitrogen
Pipe size Tightening
torque (N•m) A (mm) Flare shape
Ø9.5 32.7~39.9 12.8~13.2
Ø15.9 61.8~75.4 19.3~19.7
Ø19.1 97.2~118.6 12.3~23.7
12 345
6
6
12 3 4
1Piping union
2Spanner
3Flare nut
4Torque wrench
R=0.4~0.8
45 ±2
90 ±2
A
4PW40731-1 Page 6 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
7
9. REFRIGERANT PIPING
■Field pipes can be installed in four directions.
Figure - Field pipes in four directions (See figure 5)
When connecting the piping in the lateral direction (on the rear),
remove the piping cover (rear) in reference to figure 7.
■To install the connecting pipe to the unit in a downward direction,
make a knockout hole by penetrating the center area around the
knockout hole using a Ø6 mm drill. (See figure 5).
■Cutting out the two slits makes it possible to install as shown in
figure 5.
(Use a metal saw to cut out the slits.)
■After knocking out the knock-out, it is recommended to apply
repair paint to the edge and the surrounding end surfaces to
prevent rusting.
For U-6ML5 only
The size of the gas side stop valve is Ø15.9 while the inter-unit piping
is Ø19.1. Use the standard supplied accessory piping to make the
connection. See figure 15.
9.1. Preventing foreign objects from entering
Plug the pipe through-holes with putty or insulating material (field
supply) to stop up all gaps, as shown in the figure.
Insects or small animals entering the outdoor unit may cause a short
circuit in the electrical box.
9.2. Cautions for handling stop valve
■The stop valves for indoor-outdoor connecting piping are closed
at shipment from the factory.
The names of parts of the stop valve are shown in the figure.
■Since the side boards may be deformed if only a torque wrench
is used when loosening or tightening flare nuts, always lock the
stop valve with a wrench and then use a torque wrench.
Do not place wrenches on the valve cover.
Do not apply force on the valve cover, this may result in a
refrigerant leak.
NOTE You must use a torque wrench but if you are obliged to
install the unit without a torque wrench, you may follow
the installation method mentioned below.
After the work is finished, make sure to check that
there is no gas leak.
When you keep on tightening the flare nut with a
spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten
the flare nut within the angle shown below:
1Drill
2Center area around knockout hole
3Knockout hole
4Slit
5Connecting pipe liquid (field supply)
6Bottom frame
7Front plate
8Pipe outlet plate
9Screw front plate
10 Pipe outlet plate screw
11 Connecting pipe gas (field supply, except U-6ML5)
AForward
BBackward
CSideways
DDownward
1Piping cover (rear)
Pipe size Further tightening
angle Recommended arm length of tool
Ø9.5 (3/8") 60~90° ±200 mm
Ø15.9 (5/8") 30~60° ±300 mm
Ø19.1 (5/8") 20~35° ±450 mm
AFront connection
BRear connection
CSide connection
DBottom connection
1Gas line piping + copper gasket supplied with the unit (make sure
to always use the copper gasket).
2Gas line piping supplied with the unit
3Gas piping (field supply)
4Cut to the appropriate length.
5Gas line piping supplied with the unit
1Putty or insulating material (field
supply)
Make sure to keep the valve open during operation.
1Service port
2Stop valve
3Field piping connection
4Valve cover
1Spanner
2Torque wrench
1
3
4
1
2
2
4PW40731-1 Page 7 Thursday, October 11, 2007 9:16 AM

Installation manual
8U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
■For cooling operation under low ambient temperature or any
other operation under low pressure, apply silicon pad or similar
to prevent freezing of the gas stop valve flare nut (see figure).
Freezing of the flare nut may cause refrigerant leak.
9.3. How to use the stop valve
Use hexagonal wrenches 4 mm and 6 mm.
■Opening the valve
1. Place the hex wrench on the valve bar and turn counter-
clockwise.
2. Stop when the valve bar no longer turns. It is now open.
■Closing the valve
1. Place the hex wrench on the valve bar and turn clockwise.
2. Stop when the valve bar no longer turns. It is now closed.
9.4. Cautions for handling the valve cover
■The valve cover is sealed where
indicated by the arrow.
Take care not to damage it.
■After operating the valve, be sure to tighten the valve cover
properly.
■Check for refrigerant leakage after tightening the cap.
9.5. Cautions for handling service port
After the work, tighten the valve cover in place.
Tightening torque: 11.5~13.9 N•m
9.6. Precautions when connecting field piping and
regarding insulation
■Be careful not to let the indoor and outdoor branch piping come
into contact with the compressor terminal cover.
If the liquid-side piping insulation might come into contact with it,
adjust the height as shown in the figure below. Also, make sure
the field piping does not touch the bolts or outer panels of the
compressor.
■When the outdoor unit is installed above the indoor unit the
following can occur:
The condensated water on the stop valve can move to the
indoor unit. To avoid this, please cover the stop valve with
sealing material.
■If the temperature is higher than 30°C and the humidity is higher
than RH 80%, then the thickness of the sealing materials should
be at least 20 mm in order to avoid condensation on the surface
of the sealing.
■Be sure to insulate the liquid and gas-side field piping and the
refrigerant branch kit.
(The highest temperature that the gas-side piping can reach is
around 120°C, so be sure to use insulating material which is
very resistant.)
Silicon sealing pad
(Make sure there is no gap)
Closing direction
Liquid side Gas side
Tightening torque
Liquid pipe 13.5~16.5 N•m
Gas pipe 22.5~27.5 N•m
Any exposed piping may cause condensation or burns
if touched.
2
1
3
5
5
A
4
4
6
1Compressor
2Ter minal cover
3Indoor and outdoor
field piping
4Corking, etc.
5Insulation material
(field supply)
6Bolts
ABe careful with pipe,
bolt and outer panel
connections
4PW40731-1 Page 8 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
9
Example of connection (Connection of 8 indoor units Heat pump system)
Branch with line branch pipe Branch with line branch pipe and header branch pipe Branch with header branch pipe
Maximum allowable length
Between outdoor and indoor units
Actual pipe length Pipe length between outdoor and indoor units ≤150 m
[Example] unit 8: a+b+c+d+e+f+g+p≤150 m [Example] unit 6: a+b+h≤150 m, unit 8: a+i+k≤150 m [Example] unit 8: a+i≤150 m
Equivalent length Equivalent pipe length between outdoor and indoor units ≤175 m (Assume equivalent pipe length of line branch pipe to be 0.5 m and of the header branch pipe to be 1.0 m. (for calculation purposes)) Total extension length Total piping length from outdoor unit to all indoor units between 10 m and 300 m
Allowable height
Between outdoor and indoor units
Difference in height Difference in height between outdoor and indoor units (H1)≤50 m (≤40 m if outdoor unit is located in a lower position).
Between indoor and indoor units
Difference in height Difference in height between adjacent indoor units (H2)≤15 m
Allowable length after the branch Actual pipe length Pipe length from first refrigerant branch kit (either line branch pipe or header branch pipe) to indoor unit ≤40 m
[Example] unit 8: b+c+d+e+f+g+p≤40 m [Example] unit 6: b+h≤40 m, unit 8: i+k≤40 m [Example] unit 8: i≤40 m
Refrigerant branch kit selection Refrigerant branch kits can only be used with R410A.
Use the following line branch pipe Use the following header branch pipe
Pipe size selection Caution on selecting connection pipes If the overall equivalent piping length is ≥90 m, be sure to
enlarge the pipe diameter of the gas-side main piping. If the recommended pipe size is not available, stick to the original pipe diameter (which may result in a small capacity decrease). [Gas side] U-4+5ML5: Ø15.9➝Ø19.1 U-6ML5: Ø19.1➝Ø22.2
A. Piping between outdoor unit and refrigerant branch kit
• Match to the size of the connection piping on the outdoor unit.
Outdoor unit connection piping size
B. Piping between refrigerant branch kits
• Use the pipe size from the following table.
C. Piping between refrigerant branch kit and indoor unit
• Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
How to calculate the additional refrigerant to be charged Additional refrigerant to be charged R (kg) R should be rounded off in units of 0.1 kg
indoor unit line branch pipe header branch pipe
ab c d e f g
hi j kl mn
1234567
8
H2
H1
p
ABCDEFG H1 H2
ai
b
cde fgh
123456
k
j
78
AB
a
H1
H2
cde fghi
b
1234567
8
Outdoor unit capacity type Refrigerant branch kit name U-4~6ML5 CZ-P20BK12Q
Outdoor unit capacity type Refrigerant branch kit name U-4~6ML5 CZ-P29HK12Q
1 2
3
1Main pipe (enlarge) 2First refrigerant branch kit 3Indoor unit
Outdoor unit capacity type
Piping size (outer diameter x minimum
thickness)
Gas pipe Liquid pipe
U-4+5ML5 Ø15.9x1.0
(Ø19.1x1.0) Ø9.5x0.8
U-6ML5 Ø19.1x1.0
(Ø22.2x1.0)
Piping size (outer diameter x minimum thickness)
Gas pipe Liquid pipe
Ø15.9x1.0 Ø9.5x0.8 Indoor capacity
index
Piping size
(outer diameter x minimum thickness)
Gas pipe Liquid pipe
20+25+32+40+50 Ø12.7x0.8 Ø6.4x0.8 63+80+100+125 Ø15.9x1.0 Ø9.5x0.8
R=
(
Total length (m) of liquid
piping size at Ø9.5
)
x0.054+
(
Total length (m) of liquid
piping size at Ø6.4
)
x0.022
Example for refrigerant branch using line branch pipe and header branch pipe R=[73 x 0.054] + [69 x 0.022] = 5.46 ⇒5.5 kg
a: Ø9.5x30 m d: Ø9.5x13 m g: Ø6.4x10 m j: Ø6.4x10 m b: Ø9.5x10 m e: Ø6.4x10 m h: Ø6.4x20 m k: Ø6.4x9 m c: Ø9.5x10 m f: Ø6.4x10 m i: Ø9.5x10 m
4PW40731-1 Page 9 Thursday, October 11, 2007 9:16 AM

Installation manual
10 U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
9.7. Leak test and vacuum drying
The units were checked for leaks by the manufacturer.
See figure 6 and refer to "Additional refrigerant charge" on page 10
for nomenclature of the parts in figure 6.
•Confirm that the gas and liquid line stop valves are firmly closed
before pressure test or vacuuming.
• Make sure that valve A is completely open.
Air tight test and vacuum drying
■Air tight test: Make sure to use nitrogen gas. (For the service
port position, refer to "9.2. Cautions for handling stop valve" on
page 7.
■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.
■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.
10. ADDITIONAL REFRIGERANT CHARGE
See figure 6.
To avoid compressor breakdown. Do not charge the refrigerant
more than the specified amount.
■This outdoor unit is factory charged with refrigerant and
depending on pipe sizes and pipe lengths some systems require
additional charging of refrigerant. See "How to calculate the
additional refrigerant to be charged" on page 9.
■In case re-charge is required, refer to the nameplate of the unit.
The nameplate states the type of refrigerant and necessary
amount.
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.
10.1. Important information regarding the refrigerant
used
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type: R410A
GWP(1) value: 1975
(1) GWP = global warming potential
Please fill in with indelible ink,
■➀the factory refrigerant charge of the product,
■➁the additional refrigerant amount charged in the field and
■➀+➁ the total refrigerant charge
on the refrigerant charge label supplied with the product.
The filled out label must be adhered in the proximity of the product
charging port (e.g. onto the inside of the service cover).
■Refrigerant cannot be charged until field wiring has
been completed.
■Refrigerant may only be charged after performing the
leak test and the vacuum drying (see above).
■When charging a system, care shall be taken that its
maximum permissible charge is never exceeded, in
view of the danger of liquid hammer.
■Charging with an unsuitable substance may cause
explosions and accidents, so always ensure that the
appropriate refrigerant (R410A) is charged.
■Refrigerant containers shall be opened slowly.
■Always use protective gloves and protect your eyes
when charging refrigerant.
■When performing service on the unit requiring the
refrigerant system to be opened, refrigerant must be
evacuated according to local regulations.
■Do not use the automatic refrigerant charging function
while working on the indoor units.
When using the automatic refrigerant charging
function, the indoor units operate automatically as
well as the outdoor unit.
■When the power is on, please close the front
panel when leaving the unit.
1Pressure reducing valve
2Nitrogen
3Tank
4Siphon system
5Measuring instrument
6Vacuum pomp
7Valve A
8Gas line stop valve
9Outdoor unit
10 Liquid line stop valve
11 Indoor unit
12 Stop valve service port
13 Charge hose
Charge the liquid
refrigerant with the cylinder
in upright position.
Charge the liquid
refrigerant with the cylinder
in up-side-down position.
3
5
6
2
1
41factory refrigerant charge
of the product:
see unit name plate
2additional refrigerant
amount charged in the
field
3total refrigerant charge
4Contains fluorinated
greenhouse gases
covered by the Kyoto
Protocol
5outdoor unit
6refrigerant cylinder and
manifold for charging
4PW40731-1 Page 10 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
11
10.2. 3 procedures for adding refrigerant
Procedure 1: Adding refrigerant by using the automatic
refrigerant charging function (recommended)
How to connect the tank?
When the refrigerant tank is connected and the specified operation is
performed, the appropriate amount of refrigerant will be charged into
the system. After charging, the system will stop automatically. The
refrigerant must be charged according to the procedure described
below.
Automatic refrigerant charging procedure
1Open the liquid and gas side stop valves completely.
2Turn on the power of the outdoor unit and indoor units.
3Make sure that the led on the PCB on the outdoor unit are as
shown in the table below. This indicates that the system is
operating normally.
Led state
Throughout the manual the state of the leds is indicated as
follows:
If H2P is lit up, check the type of error based on the error code in
the remote controller and correct the error in accordance with
"12.4. Test operation" on page 19.
4Automatically charge the refrigerant according to the procedure
described below.
4.1 Press once.
4.2 Press for 5 seconds. The unit will start running.
If the led display below appears, the automatic refrigerant
charging restriction has been exceeded. Additional refrigerant
must be charged by calculating the additional refrigerant
charging amount.
or
If the led display below appears, check the indoor unit
connection capacity.
If the led display below appears, the liquid and gas side stop
valves may be closed.
4.3 When the led indication becomes as shown in the table below in
about 15 to 30 minutes after start of operation, open valve A at
once to start charging of the refrigerant.
Immediately after starting charging of the refrigerant by opening
valve A, press once. When is not pressed
within 10 minutes after the led indication is shown, charging is
stopped.
1Liquid line stop valve
2Gas line stop valve
3To indoor unit
4Service port for adding refrigerant
5Valve A
6R410A tank
7Measuring instrument
8Pipe fixing plate
CAUTION
■Make sure to turn ON the power 6 hours before
starting the operation. This is necessary to warm the
crankcase by the electric heater.
■Automatic charging is able to charge 6 kg/hour
refrigerant at an outside temperature of 0°C to 24 kg/
hour refrigerant at an outside temperature of 35°C.
The charging time depends on the amount of charged
refrigerant and on the outside temperature.
■Automatic refrigerant charging is NOT possible if the
following restrictions are exceeded:
■Outside temperature: 0°C DB~43°C DB
■Indoor temperature: 0°C DB~32°C DB
■Indoor unit connection capacity: 50%~130%
Note that valve A must be closed!
NOTE When an indoor unit is connected to the
refrigerant system and the indoor unit is turned
off, automatic charging will fail.
MODE
TEST/HWL
IND
MASTER
SLAVE
L.N.O.P.
DEMAND
H1P H2P H3P H4P H5P H6P H7P
xxwxxxx
3
6
7
12
45
3
6
7
12
8
4
5
DPQ XPQ
xOFF
wON
cblinking
❃ON or OFF
WARNING
Do not touch anything else than the push-
buttons (BS1~5) on the PCB when making
the settings. These settings must be done
with the power on
H1P H2P H3P H4P H5P H6P H7P
wwwwwww
H1P H2P H3P H4P H5P H6P H7P
xcxxx❃❃
H1P H2P H3P H4P H5P H6P H7P Description of error
wcccw x x Inappropriate outdoor
temperature
H1P H2P H3P H4P H5P H6P H7P Description of error
wccc x w x Inappropriate indoor
temperature
H1P H2P H3P H4P H5P H6P H7P Description of error
wcccc x w Inappropriate indoor unit
connection capacity
H1P H2P H3P H4P H5P H6P H7P Description of error
wx ❃❃❃❃❃
Stop valve is closed
NOTE If you want to repeat the automatic refrigerant
charging operation from step 4.2, fully open the
liquid and gas side stop valves and press the
button once.
BS4 TEST
BS4 TEST
BS1 MODE
BS4 TEST BS4 TEST
4PW40731-1 Page 11 Thursday, October 11, 2007 9:16 AM

Installation manual
12 U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
4.4 The led indication becomes as shown in the table below during
automatic refrigerant charging.
During automatic refrigerant charging, the remote controller
indicates (test operation) and (external control).
The led indication becomes as shown in the table below when
automatic refrigerant charging is about to end. Prepare to close
the valve on the refrigerant tank.
4.5 When the led indication becomes as shown in the table below,
quickly close valve A and follow instructions as described below.
Case 1: Charging complete
Charging of the refrigerant is complete. Press
button once and go to step 5.
Case 2: Recharging operation
Press button once and perform automatic
refrigerant charging again starting from Step 4.2.
Case 3: Charging interrupted
Something is preventing normal operation:
■Is the gas side stop valve completely open?
■Are the valve on the refrigerant tank and valve A open?
Check if the button was pressed within 10
minutes after the valves were opened.
■Is the indoor unit air intake vent or outlet vent blocked?
After correcting the problem, press button once and
perform automatic refrigerant charging again starting from
step 4.2.
Case 4: Failure
After correcting the problem, press button once and
perform automatic refrigerant charging again starting from
step 4.2.
5When charging is complete, determine the weight of refrigerant
that was added and fill in the amount in the "Additional
refrigerant charge label" attached to service precautions plate
on the unit.
6After adding the refrigerant, do not forget to close the lid of the
service port. The tightening torque for the lid is 11.5~13.9 N•m.
Procedure 2: Charging while the outdoor unit is at a standstill
See figure 6.
1Determine the weight of refrigerant to be charged additionally
referring to the item "Additional refrigerant charge" in "How to
calculate the additional refrigerant to be charged" on page 9 and
fill in the amount in the "Additional refrigerant charge label"
attached to the unit.
2After the vacuum drying is finished, open valve A and charge the
additional refrigerant in its liquid state through the service port
on the liquid stop valve taking into account following instructions:
-Turn on the power of the outdoor unit and indoor units.
- Check that gas and liquid stop valves are closed.
- Stop the compressor and charge the specified weight of
refrigerant.
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
ccc xwxw PA
H1P H2P H3P H4P H5P H6P H7P
wc ❃❃❃❃❃
NOTE If the led display below appears, the refrigerant
tank is empty. Replace the refrigerant tank, open
valve A and re-charge.
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
cccwwww PE
NOTE It is possible that the code PE is not shown on the
remote controller but this does not indicate a
malfunction. The led indication can immediately
shift to the situation as shown in "Case 1:
Charging complete" on page 12.
CAUTION
■When adding refrigerant is done or when
pausing, close the valve on the refrigerant tank
immediately.
More refrigerant might be charged by any
remaining pressure after the machine is stopped.
■The outdoor fan may keep rotating a little bit
more, but this does not indicate a malfunction.
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
wccwwww P9
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
wcc x www P8
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
wcc xxxw P2
H1P H2P H3P H4P H5P H6P H7P Code on remote controller
wcc x xwx PA
BS1 MODE
BS1 MODE
BS4 TEST
H1P H2P H3P H4P H5P H6P H7P Error code on remote
controller
xwwxxxx See footnote(*)
(*) An error in the system interrupted the operation of the unit. Check the
error by using the error code displayed on the remote controller. For an
explanation of the error codes, see "Error codes on the remote controller"
on page 20 and solve the problem.
1Service port for adding refrigerant
2Liquid line stop valve
3Gas line stop valve
4Pipe fixing plate
BS1 MODE
BS1 MODE
1
2
3
2
4
3
DPQ XPQ
4PW40731-1 Page 12 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
13
Procedure 3: Charging while the outdoor unit is operating
See the figure in "How to connect the tank?" on page 11.
1Completely open the gas side stop valve and liquid side stop
valve. Valve A must be left fully closed.
2Close the front panel and turn on the power to all indoor units
and the outdoor unit.
3Open valve A immediately after starting of the compressor.
4Charge the additional refrigerant in its liquid state through the
service port of the liquid line stop valve.
5While the unit is at a standstill and under setting mode 2 (refer to
Checks before initial start-up, "Setting the mode" on page 18),
set the required function A (additional refrigerant charging
operation) to (ON). Then operation starts. The blinking H2P
led indicates test operation and the remote controller indicates
(test operation) and (external control).
6When the specified amount of refrigerant is charged, push the
button. Then operation stops.
■The operation automatically stops within 30 minutes.
■If the refrigerant charge cannot be finished within 30 minutes,
repeat step 5.
■If the operation stops immediately after restart, there is a
possibility that the system is overcharged.
The refrigerant cannot be charged more than this amount.
7After the refrigerant charge hose is removed, make sure to close
valve A.
11. ELECTRICAL WIRING WORK
11.1. Internal wiring – Parts table
L............................. Live
N............................ Neutral
........... Field wiring
.................... Terminal strip
......................... Connector
......................... Protective earth (screw)
.......................... Connection
....................... Relay connector
...........................Functional earthing
...........................Terminal
..........................Movable connector
..........................Fixed connector
BLU........................Blue
BRN .......................Brown
GRN.......................Green
RED .......................Red
WHT.......................White
YLW .......................Yellow
ORG.......................Orange
BLK ........................Black
A1P ........................Printed circuit board (main)
A2P ........................Printed circuit board (inverter)
A3P ................ * .....Printed circuit board (noise filter)
A4P ................ * .....Printed circuit board (C/H selector)
BS1~BS5 ...............Push button switch (mode, set, return, test,
reset)
C1~C3....................Capacitor
C4 .................. * .....Capacitor
DS1........................DIP switch
E1HC .....................Crankcase heater
F1U, F4U ....... * .....Fuse (T 6.3 A/250 V)
F1U (A1P)......# .....Fuse (T 6.3 A/250 V)
F3U (A1P)......# .....Fuse (T 6.3 A/250 V)
F4U (A1P)......# .....Fuse (T 6.3 A/250 V)
F6U ................ * .....Fuse (T 5.0 A/250 V)
FINTH ............ * .....Thermistor (fin)
H1P~H8P...............Light emitting diode (service monitor orange)
Prepare, test: blinking
H2P........................Malfunction detection: light up
HAP................ * .....Light emitting diode (service monitor green)
HAP (A1P) .....# .....Light emitting diode (service monitor green)
HAP (A2P) .....# .....Light emitting diode (service monitor green)
K1M................ * .....Magnetic contactor (M1C)
K1M (A1P) .....# .....Magnetic contactor
K1R........................Magnetic relay (Y1S)
K2R........................Magnetic relay (Y2S)
K3R........................Magnetic relay (Y3S)
K4R........................Magnetic relay (E1HC)
K5R........................Magnetic relay
K6R................# .....Magnetic relay
L1R ........................Reactor
M1C .......................Motor (compressor)
M1F........................Motor (fan) (upper)
M2F........................Motor (fan) (lower)
PS ..........................Switching power supply
Q1DI.......................Field earth leakage breaker (300 mA)
R1 .................. * .....Resistor (current limiting)
R1 (A1P) ........# .....Resistor
R1 (A2P) ........# .....Resistor
R2 .................. * .....Resistor (current sensor)
R2 (A2P) ........# .....Resistor
R1T ........................Thermistor (air)
■To avoid compressor breakdown. Do not charge the
refrigerant more than the specified amount.
■If the total refrigerant cannot be charged while the
outdoor unit is at a standstill, it is possible to charge
the refrigerant by operating the outdoor unit using the
refrigerant charge function (refer to "Setting mode 2"
on page 18) and follow "Procedure 3: Charging while
the outdoor unit is operating" on page 13.
■All wiring must be performed by an authorized
electrician.
■All field supplied components and all electric
construction should comply with the applicable local
and national codes.
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
ON
BS3 RETURN
4PW40731-1 Page 13 Thursday, October 11, 2007 9:16 AM

Installation manual
14 U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
R2T ................*......Thermistor (discharge)
R2T ............... #......Thermistor (M1C discharge)
R3T ........................Thermistor (suction 1)
R4T ................*......Thermistor (heat exchanger)
R4T ............... #......Thermistor (subcool)
R5T ........................Thermistor (suction 2)
R6T ................*......Thermistor (subcooling heat exchanger)
R6T ............... #......Thermistor (heat exchanger)
R7T ................*......Thermistor (liquid pipe)
R7T ............... #......Thermistor (liquid pipe 1)
R8T ........................Thermistor (liquid pipe 2)
R9T ............... #......Thermistor (power module)
S1NPH ...................Pressure sensor (high)
S1NPL....................Pressure sensor (low)
S1PH......................Pressure switch (high)
V1R ........................Power module
V2R, V3R ...............Diode module
V1T.................*......IGBT (Insulated Gate Bipolar Transistor)
X1M........................Terminal strip (power supply)
X1M................*......Terminal strip (C/H selector) (A4P)
X2M................*......Terminal strip (control)
X2M............... #......Terminal strip (control) (cool/heat selector)
Y1E ........................Electronic expansion valve (main)
Y3E ........................Electronic expansion valve (subcool)
Y1S ........................Solenoid valve (4 way valve)
Y2S ........................Solenoid valve (hot gas)
Y3S ........................Solenoid valve (unload circuit)
Z1C~Z8C........*......Noise filter (ferrite core)
Z1C~Z4C....... #......Noise filter (ferrite core)
Z1F~Z4F ........*......Noise filter
Z1F................ #......Noise filter (with surge absorber)
Z2F................ #......Noise filter
Cool/heat selector
S1S ........................Selector switch (fan/cool – heat)
S2S ........................Selector switch (cool – heat)
Connector of option adaptor
X37A ......................Connector (option adaptor power supply)
*..............................For U-4~6ML5DPQ only
# .............................For U-4~6ML5XPQ only
Notes
11.2. Precautions on electrical wiring work
■Before obtaining access to terminal devices, all supply circuits
must be interrupted.
■Use only copper wires.
■Do not turn on the main switch until all the wiring is completed.
Make sure that the main switch has a contact separation of at
least 3 mm in all poles.
■Never squeeze bundled cables into a unit.
■Secure the electrical wiring with clamping material as shown in
figure 9 so that it does not come in contact with the piping,
particularly on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
■When installing the earth leakage breaker make sure that it is
compatible with the inverter (resistant to high frequency
electrical noise) to avoid unnecessary opening of the earth
leakage breaker.
■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.
■Follow the "electrical wiring diagram" when carrying out any
electrical wiring.
■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.
•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.
■XPQ: Make sure to connect power supply cables in normal
phase. If connected in reverse phase, the remote controller of
the indoor unit indicates " U1 "and the equipment cannot operate.
Change any two of the three power supply cables (L1, L2, L3) to
correct phase.
11.3. Connection example of total system wiring
(See figure 8)
1This wiring diagram only applies to the outdoor unit.
4When using the option adaptor, refer to the installation manual.
5Refer to the wiring diagram sticker (on the back of the front
plate) for instructions on how to use BS1~BS5 and DS1-1,
DS1-2 switches.
6Do not operate the unit by short-circuiting protection device
S1PH.
8Refer to the installation manual for connection wiring to indoor-
outdoor transmission F1-F2.
9When using the central control system, connect outdoor-
outdoor transmission F1-F2.
1Power
2Earth leakage breaker
3Branch switch overcurrent breaker (fuse)
4Ground
5Remote controller
4PW40731-1 Page 14 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
15
11.4. Connecting power wire and transmission wires
■Let the power wire (including ground wire) go through the power
outlet port on either the front, side or back of the outdoor unit.
■Let the transmission wires go through the cable outlet port, pipe
outlet port or knock out hole on either the front, side or back of
the outdoor unit. (See figure 9).
Precautions when knocking out knockout holes
■To punch a knock 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 knock holes, remove
any burrs from the knock holes and wrap the wiring with
protective tape to prevent damage.
■If there is any possibility that small animals enter the system
through the knock holes, plug the holes with packing materials
(to be prepared on-site).
11.5. Power circuit and cable requirements
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.
■In connecting the power cable to the power terminal block,
securely clamp the cable as shown in figure 9.
ARear direction
BLateral direction
CFront direction
1Power terminal block (X1M)
2Control wiring between units
3Power cable with ground wire. (Keep proper distance between
power cable and control wiring).
4Clamp (field supply)
5Stop valve mounting plate
6Power cable
7Ground cable (yellow/green)
8Fix the control wiring with the clamp
9Control terminal block (X2M)
1Knockout hole
2Burr
3Packing materials
■Use a power wire pipe for the power wiring.
■Outside the unit, make sure the 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
"11.4. Connecting power wire and transmission wires"
on page 15.
■Inter-unit wiring should be secured as described in
"11.4. Connecting power wire and transmission wires"
on page 15.
•Secure the wiring with clamps so that it does not touch
the piping.
•Make sure the wiring and the electric box lid do not
stick up above the structure, and close the cover
firmly.
23 1
U-4~6ML5DPQ U-4~6ML5XPQ
Phase and
frequency 1 N~50 Hz 3 N~50 Hz
Voltage 220-240 V 380-415 V
Recommended
field fuse 32 A 16 A
Minimum circuit
amps (MCA)(*)
(*) Stated values are maximum values (see electrical data of combination with
indoor units for exact values).
27 13.5
Transmission line
section 0.75~1.25 mm2
Wire type(†)
(†) Only in protected pipes, use H07RN-F when protected pipes are not used.
H05VV
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.
After finishing the electric work, confirm that each electric
part and terminal inside the electric parts box is connected
securely.
4PW40731-1 Page 15 Thursday, October 11, 2007 9:16 AM

Installation manual
16 U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Field line connection: Control wiring and cool/heat selection
See figure 10.
Setting the cool/heat operation
1Performing cool/heat setting with the remote controller
connected to the indoor unit.
Keep the cool/heat selector switch (DS1-1) on the outdoor unit
PC board at the factory setting position IN/D UNIT. (See
figure 11).
2Performing 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 (DS1-1) on
the outdoor unit PC board to OUT/D UNIT. (See figure 12).
■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 14.
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm2
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover remote controller only.)
Precautions when laying power wiring
Use round pressure terminals for connections to the power
terminal block.
When none are available, follow the instructions below.
■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.
If an excessive force is applied while connecting a cable to
the terminal block on the PC board, the PC board may be
damaged.
1Cool/heat selector
2Outdoor unit PC board
3Take care of the polarity
4Use the conductor of sheathed wire (2 wire) (no polarity)
5Ter minal board (field supply)
1Remote controller
1Cool/heat selector
NOTE When the cool/heat selector is set to heat, you
cannot select cooling with the remote controller.
12
1Round pressure terminal
2Power wire
Tightening torque (N•m)
M5 (Power terminal block/ground wire) 2.39~2.92
M4 (Shielded ground) 1.18~1.44
M3.5 (Control wiring block) 0.79~0.97
For low-noise operation or demand 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.
■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: 300 m
Total wiring length: 600 m
Maximum No. of branches: 9
■Up to 9 branches are possible for unit-to unit cabling.
No branching is allowed after branching. (See
figure 13).
■Never connect the power supply to unit-to-unit cabling
terminal block. Otherwise the entire system may
break down.
1Liquid pipe
2Gas pipe
3Interconnecting wiring
4Insulator
5Finishing tape
1Branch
2Subbranching
4PW40731-1 Page 16 Thursday, October 11, 2007 9:16 AM

U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Installation manual
17
12. BEFORE OPERATION
12.1. Service precautions
Caution when performing service to inverter equipment
■Do not touch live parts for 10 minutes after the power supply is
turned off because of high voltage risk.
■Additionally, measure the points as shown in the figure with a
tester and confirm that the voltage of the capacitor in the main
circuit is no more than 50 V DC.
■Make sure that the power supply is turned off before performing
the maintenance work. The heater of the compressor may
operate even in stop mode.
■Please note that some sections of the electric component box
are extremely hot.
■In order to prevent damage to the PCB, first eliminate static
electricity by touching a metal part (e.g. stop valve) with your
hand. Then pull out the connector.
■After measuring the residual voltage, pull out the outdoor fan
connector.
■Make sure you do not touch a conductive section.
■The outdoor fan may rotate due to strong backblow wind,
causing the capacitor to charge. This may result in an electric
shock.
After maintenance, make sure the outdoor fan connector is
connected again. Otherwise, the unit may break down.
12.2. Checks before initial start-up
After the installation, check the following before switching on the
circuit breaker:
1Transportation stay
Be sure that the transportation stay is removed from the
compressor.
2The 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.
3Power 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.
4Pipe sizes and pipe insulation
Make sure that correct pipe sizes are installed and that the
insulation work is properly executed.
5Additional 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.
6Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 MΩor more is attained by applying a voltage of
500 V DC between power terminals and earth. Never use the
megatester for the transmission wiring.
7Stop valves
Be sure that the stop valves are open on both liquid and gas
side.
8Drain pipe installation
Make sure that the drain piping is installed properly.
12.3. Field setting
If required, carry out any field setting according to the following
instructions. Refer to the service manual for more details.
Handling the switches
When carrying out field settings, operate the
switches with an insulated stick (such as a ball-
point pen) to avoid touching of live parts.
WARNING: ELECTRIC SHOCK
A2P
A1P
A1P
X2M
A4P
X106A X107A
DPQ
C+
C–
XPQ
Play it safe!
Touch a metal part by hand (such as the stop valve) in
order to eliminate static electricity and to protect the PCB
before performing service.
NOTE Note 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.
4PW40731-1 Page 17 Thursday, October 11, 2007 9:16 AM

Installation manual
18 U-4~6ML5DPQ + U-4~6ML5XPQ
Urban Multi air conditioner
4PW40731-1
Location of the DIP switches, leds and buttons
Led state
Throughout the manual the state of the leds is indicated as follows:
Setting the push button switch (BS1~5)
Function of the push button switch which is located on the outdoor
unit PCB:
The figure shows state of the led indications when the unit is shipped
from the factory.
Setting the mode
The set mode can be changed with the button according
to the following procedure:
■For setting mode 1: Press the button once, the led
is off x.
■For setting mode 2: Press the button for
5 seconds, the H1P led is on w.
If the H1P led is blinking cand the button is pushed
once, it will change to setting mode 1.
Setting mode 1
The H1P led is off (COOL/HEAT selection setting).
Setting procedure
1Push the button and adjust the led indication to either
one of the possible settings as shown below in the field marked
:
2Push the button and the setting is defined.
Setting mode 2
The H1P led is on.
Setting procedure
1Push the button according to the required function
(A~F). The led indication that matches the required function is
shown below in the field marked :
2When the button is pushed, it indicates the current
setting.
3Push the button according to the required setting
possibility as shown below in the field marked .
3.1 Possible settings for function A, B and F are (ON) or
(OFF).
1Led H1P~H8P
2Push button switches BS1~BS5
3DIP switches 2 (DS1-1, DS1-2)
xOFF
wON
cblinking
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
NOTE If you get confused in the middle of the setting
process, push the button.Then it returns to
setting mode 1 (H1P led is off).
1
2
3
BS1 BS2 BS3 BS4 BS5
MODE
DS1 1 2
ON OFF
TEST/
HWL
IND MASTER SLAVE L.N.O.P. DEMAND
H1P H2P H3P H4P H5P H6P H7P
MODE SET RETURN TEST RESET
BS1 MODE
BS2 SET
BS3 RETURN
BS4 TEST
BS5 RESET
BS1 MODE
BS1 MODE
BS1 MODE
BS1 MODE
BS1 MODE
1In case of COOL/HEAT setting by each individual outdoor unit
circuit.
2In case of COOL/HEAT setting by the master unit when outdoor
units are connected in multiple-system combination(*).
(*) It is necessary to use the optional external control adapter for
outdoor unit (DTA104A61/62). See the instruction delivered with
the adapter.
3In case of COOL/HEAT setting by the slave unit when outdoor
units are connected in multiple-system combination(*).
H1P H2P H3P H4P H5P H6P H7P
1xxc x xxx
2xxx c xxx
3xxx x cx x
Possible functions
Aadditional refrigerant charging operation.
Brefrigerant recovery operation/vacuuming operation.
Cautomatic low noise operation setting at nighttime.
Dlow noise operation level setting ( ) via the external
control adapter.
Epower consumption limitation setting ( ) via the external
control adapter.
Fenabling function of the low noise operation level setting
()and/or power consumption limitation setting
()via the external control adapter (DTA104A61/62).
H1P H2P H3P H4P H5P H6P H7P
Aw x w x w x x
Bw x w x w x w
Cw x w x w w x
Dw x w w x x w
Ew x w w w w x
Fw x x w w x x
H1P H2P H3P H4P H5P H6P H7P
ON wxxxxc x
OFF(*)
(*) This setting = factory setting.
wxxxxx c
BS2 SET
BS3 RETURN
BS2 SET
L.N.O.P
DEMAND
L.N.O.P
DEMAND
BS3 RETURN
BS2 SET
ON OFF
4PW40731-1 Page 18 Thursday, October 11, 2007 9:16 AM