LG Multi V PRHR042A User manual

INSTALLATION MANUAL
AIR
CONDITIONER
Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring standards
by authorized personnel only.
Please retain this installation manual for future reference after reading it thoroughly.
For Heat Pump / Heat Recovery system
Original instruction
MFL69717901
Rev.02_111320
www.lghvac.com
www.lg.com
Copyright © 2020 LG Electronics Inc. All Rights Reserved.
ENGLISH
FRANÇAIS
ESPAÑOL

2
ENGLISH
TIPS FOR SAVING ENERGY
Here are some tips that will help you minimize the power consumption
when you use the air conditioner. You can use your air conditioner
more efficiently by referring to the instructions below:
IMPORTANT SAFETY
INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USING THE
APPLIANCE.
Always comply with the following precautions to avoid dangerous
situations and ensure peak performance of your product.
WARNING
It can result in serious injury or death when the directions are ignored.
CAUTION
It can result in minor injury or product damage when the directions are
ignored.
WARNING
• Installation or repairs made by unqualified persons can result in
hazards to you and others. Installation of all field wiring and
components MUST conform with local building codes or, in the
absence of local codes, with the National Electrical Code 70 and the
National Building Construction and Safety Code or Canadian
Electrical code and National Building Code of Canada.
• The information contained in the manual is intended for use by a
qualified service technician familiar with safety procedures and
equipped with the proper tools and test instruments.
• Failure to carefully read and follow all instructions in this manual can
result in equipment malfunction, property damage, personal injury
and/or death.
Installation
• Have all electric work done by a licensed electrician according to
"Electric Facility Engineering Standard" and "Interior Wire
Regulations" and the instructions given in this manual and always
use a special circuit.
- If the power source capacity is inadequate or electric work is
performed improperly, electric shock or fire may result.
• Ask the dealer or an authorized technician to install the air
conditioner.
- Improper installation by the user may result in water leakage,
electric shock, or fire.
• Always ground the product.
- There is risk of fire or electric shock.
• Always intstall a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric shock.
• For re-installation of the installed product, always contact a dealer
or an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or injury.
• Do not store or use flammable gas or combustibles near the air
conditioner.
- There is risk of fire or failure of product.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Prepare for strong wind or earthquake and install the unit at the
specified place.
- Improper installation may cause the unit to topple and result in
injury.
• Do not install the product on a defective installation stand.
- It may cause injury, accident, or damage to the product.
• Use a vacuum pump or Inert(nitrogen) gas when doing leakage test
or air purge. Do not compress air or Oxygen and do not use
Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
• When installing and moving the air conditioner to another site, do
not charge it with a different refrigerant from the refrigerant
specified on the unit.
- If a different refrigerant or air is mixed with the original refrigerant,
the refrigerant cycle may malfunction and the unit may be
damaged.
• Do not reconstruct to change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device
is shorted and operated forcibly, or parts other than those
specified by LGE are used, fire or explosion may result.
• Ventilate before operating air conditioner when gas leaked out.
- It may cause explosion, fire, and burn.
• Securely install the cover of control box and the panel.
- If the cover and panel are not installed securely, dust or water may
enter the outdoor unit and fire or electric shock may result.
• If the air conditioner is installed in a small room, measures must be
taken to prevent the refrigerant concentration from exceeding the
safety limit when the refrigerant leaks.
- Consult the dealer regarding the appropriate measures to prevent
the safety limit from being exceeded. Should the refrigerant leak
and cause the safety limit to be exceeded, harzards due to lack of
oxygen in the room could result.
Operation
• Do not damage or use an unspecified power cord.
- There is risk of fire, electric shock, explosion, or injury.
• Use a dedicated outlet for this appliance.
- There is risk of fire or electrical shock.
• Be cautious that water could not enter the product.
- There is risk of fire, electric shock, or product damage.
• Do not touch the power switch with wet hands.
- There is risk of fire, electric shock, explosion, or injury.
• When the product is soaked (flooded or submerged), contact an
Authorized Service Center.
- There is risk of fire or electric shock.
• Be cautious not to touch the sharp edges when installing.
- It may cause injury.
• Take care to ensure that nobody could step on or fall onto the
outdoor unit.
- This could result in personal injury and product damage.
!
!
!
• Do not cool excessively indoors. This may be harmful for your
health and may consume more electricity.
• Block sunlight with blinds or curtains while you are operating the
air conditioner.
• Keep doors or windows closed tightly while you are operating the
air conditioner.
• Adjust the direction of the air flow vertically or horizontally to
circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, in a short
period of time.
• Open windows regularly for ventilation as the indoor air quality
may deteriorate if the air conditioner is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities
collected in the air filter may block the air flow or weaken the
cooling / dehumidifying functions.
For your records
Staple your receipt to this page in case you need it to prove the date
of purchase or for warranty purposes. Write the model number and
the serial number here:
Model number :
Serial number :
You can find them on a label on the side of each unit.
Dealer’s name :
Date of purchase :

3
• Do not open the inlet grille of the product during operation. (Do not
touch the electrostatic filter, if the unit is so equipped.)
- There is risk of physical injury, electric shock, or product failure.
CAUTION
Installation
• Always check for gas (refrigerant) leakage after installation or repair
of product.
- Low refrigerant levels may cause failure of product.
• Do not install the product where the noise or hot air from the
outdoor unit could damage the neighborhoods.
- It may cause a problem for your neighbors.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
• Do not install the unit where combustible gas may leak.
- If the gas leaks and accumulates around the unit, an explosion
may result.
• Use power cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a
fire.
• Do not use the product for special purposes, such as preserving
foods, works of art, etc. It is a consumer air conditioner, not a
precision refrigeration system.
- There is risk of damage or loss of property.
• Keep the unit away from children. The heat exchanger is very
sharp.
- It can cause the injury, such as cutting the finger. Also the
damaged fin may result in degradation of capacity.
• When installting the unit in a hospital, communication station, or
similar place, provide sufficient protection against noise.
- The inverter equipment, private power generator, high-frequency
medical equipment, or radio communication equipment may cause
the air conditioner to operate erroneously, or fail to operate. On
the other hand, the air conditioner may affect such equipment by
creating noise that disturbs medical treatment or image
broadcasting.
• Do not install the product where it is exposed to sea wind (salt
spray) directly.
- It may cause corrosion on the product. Corrosion, particularly on
the condenser and evaporator fins, could cause product
malfunction or inefficient operation.
• Do not install the unit in potentially explosive atmospheres.
Operation
• Do not use the air conditioner in special environments.
- Oil, steam, sulfuric smoke, etc. can significantly reduce the
performance of the air conditioner or damage its parts.
• Do not block the inlet or outlet.
- It may cause failure of appliance or accident.
• Make the connections securely so that the outside force of the
cable may not be applied to the terminals.
- Inadequate connection and fastening may generate heat and
cause a fire.
• Be sure the installation area does not deteriorate with age.
- If the base collapses, the air conditioner could fall with it, causing
property damage, product failure, or personal injury.
• Install and insulate the drain hose to ensure that water is drained
away properly based on the installation manual.
- A bad connection may cause water leakage.
• Be very careful about product transportation.
- Only one person should not carry the product if it weighs more
than
20 kg (44 lbs).
- Some products use PP bands for packaging. Do not use any PP
bands for a means of transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your
fingers.
- When transporting the outdoor unit, suspending it at the specified
positions on the unit base. Also support the outdoor unit at four
points so that it cannot slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts,
may cause stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children
may not play with them. If children play with a plastic bag which
was not torn apart, they face the risk of suffocation.
• Turn on the power at least 6 hours before starting operation.
- Starting operation immediately after turning on the main power
switch can result in severe damage to internal parts. Keep the
power switch turned on during the operational season.
• Do not touch any of the refrigerant piping during and after
operation.
- It can cause a burn or frostbite.
• Do not operate the air conditioner with the panels or guards
removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not directly turn off the main power switch after stopping
operation.
- Wait at least 5 minutes before turning off the main power switch.
Otherwise it may result in water leakage or other problems.
• Auto-addressing should be done in condition of connecting the
power of all indoor and outdoour units. Auto-addressing should also
be done in case of changing the indoor unit PCB.
• Use a firm stool or ladder when cleaning or maintaining the air
conditioner.
- Be careful and avoid personal injury.
• Do not insert hands or other objects through the air inlet or outlet
while the air conditioner is plugged in.
- There are sharp and moving parts that could cause personal injury.
!
ENGLISH

4
ENGLISH
51 INSTALLATION GUIDE AT THE SEASIDE
51 Model Designation
51 Airborne Noise Emission
2TIPS FOR SAVING ENERGY
2IMPORTANT SAFETY INSTRUCTIONS
5INSTALLATION PROCESS
5OUTDOOR UNITS INFORMATION
5ALTERNATIVE REFRIGERANT R410A
5SELECT THE BEST LOCATION
7INSTALLATION SPACE
8Air guide work
9LIFTING METHOD
9INSTALLATION
9The location of the Anchor bolts
9Foundation for Installation
10 Preparation of Piping
11 Plumbing materials and storage methods
12 REFRIGERANT PIPING INSTALLATION
12 Precautions on Pipe connection / Valve operation
13 Installation procedure for HR unit
13 Installation of Outdoor Unit, HR Unit, Indoor Unit Refrigerant
Pipe
13 Type of HR Unit
14 Installation of Zoning Control
15 Precautions on Pipe connection / Valve operation
17 PIPE CONNECTIONS BETWEEN INDOOR
AND OUTDOOR UNIT
17 Preparation Work
18 Pipe Drawing Out during Single connection
18 Refrigerant piping system
21 Preparation Work
21 Pipe Drawing Out during Single connection
22 Refrigerant piping system
24 Refrigerant charging
24 Branch pipe Fitting
29 Distribution Method
29 Vacuum Mode
30 Leak Test and Vacuum drying
31 Thermal insulation of refrigerant piping
32 ELECTRICAL WIRING
33 Control box and connecting position of wiring
33 Communication and Power Cables
34 Wiring of main power supply and equipment capacity
34 Field Wiring
36 Checking the setting of outdoor units
37 Switch for setup of HR Unit
41 Automatic Addressing
41 The Procedure of Automatic Addressing
42 Flow chart of auto pipe detection Process
43 Flow chart of manual addressing for pipe detection
43 Example of manual valve addressing (Non-Zoning setting)
44 Example of manual valve addressing (Zoning setting)
44 Method of checking the pipe detection result at HR unit
44 Identification of Manual Valve ID (Address)
44 Method of checking the pipe detection result at outdoor unit
44 Setting method of Master indoor unit in zoning
45 Group Number setting
45 Cool & Heat selector (Fn 1)
46 High Static Pressure Compensation mode (Fn 2)
46 Night Low Noise Function (Fn 3)
46 Setting the ODU address (Fn 5)
47 Snow removal & rapid defrost (Fn 6)
47 Target pressure adjusting (Fn 8)
48 Self-Diagnosis Function
50 CAUTION FOR REFRIGERANT LEAK
50 Introduction
50 Checking procedure of limiting concentration
TABLE OF CONTENTS

CAUTION
!
• The wall thickness of the piping should comply with the relevant
local and national regulations for the designed pressure 3.8 MPa
[551.1 psi]
• Since R410A is a mixed refrigerant, the required additional
refrigerant must be charged in its liquid state.
If the refrigerant is charged in its gaseous state, its composition
changes and the system will not work properly.
• Do not place the refrigerant container under the direct rays of
the sun to prevent it from exploding.
• For high-pressure refrigerant, any unapproved pipe must not be
used.
• Do not heat pipes more than necessary to prevent them from
softening.
• Be careful not to install wrongly to minimize economic loss
because it is expensive in comparison with R22.
5
ENGLISH
CAUTION
!
• Ratio of the connectable Indoor Units to the Outdoor: 50 ~
130%
• Ratio of running Indoor Units to the Outdoor: 10 ~ 100%
• A combination operation over 100% cause to reduce each
indoor unit capacity.
The foundation must be level even
Outdoor unit foundation work
Avoid short circuits and ensure
sufficient space is allowed for service
Installation of outdoor unit
Refer to automatic addressing flowchart
Automatic addressing of indoor unit
In the final check for 24 hours at 3.8 MPa (38.7 kgf/cm
2
)[551.1 psi]
there must be no drop in pressure.
Airtight test
Multiple core cable must not be used.
(suitable cable should be selected)
Electrical work
(connection circuits and drive circuits)
Make sure no gaps are left where
the insulating materials are joined
Heat insulation work
Make sure airflow is sufficient
Duct work
Adjust to downward gradient
Drain pipe work
Special attention to dryness,
cleanness and tightness
Refrigerant piping work
Check model name to
make sure the fitting
is made correctly
Installation of indoor unit
Take account of gradient
of drain piping
Sleeve and insert work
Make connection clearly between outdoor, indoor,
remote controller and option.
Preparation of contract drawings
Indicate clearly who will be responsible for switch setting.
Determination of division work
The vacuum pump used must have a capacity of reaching at least
5 torr, more than 1 hour
Vacuum drying
Recharge correctly as calculated in this manual. and record the
amount of added refrigerant
Additional charge of refrigerant
Make sure there are no gaps left between the facing materials
used on the ceiling
Fit facing panels
Run each indoor unit in turn to make sure the pipe work
has been fitted correctly
Test run adjustment
Explain the use of the system as clearly as possible to your customer and
make sure all relevant documentation is in order
Transfer to customer with explanation
Preheat the crank case with the electrical heater for more than 6 hours.
CAUTION
!
• The above list indicates the order in which the individual work
operations are normally carried out but this order may be varied
where local conditions warrants such change.
• The thickness of the piping should comply with the relevant local
and national regulations for the designed pressure 3.8 MPa
(551.1 psi).
• Since R410A is a mixed refrigerant, the required additional
refrigerant must be charged in its liquid state.(If the refrigerant is
charged in its gaseous state, its composition changes and the
system will not work properly.)
SELECT THE BEST LOCATION
Select space for installing outdoor unit, which will meet the following
conditions:
• No direct thermal radiation from other heat sources
• No possibility of annoying neighbors due to noise of unit
• No exposition to strong wind
• With strength which bears weight of unit
• Note that drain flows out of unit when heating
• Because of the possibility of fire, do not install unit to the space
where generation, inflow, stagnation, and leakage of combustible gas
is expected.
• Avoid unit installation in a place where acidic solution and spray
(sulfur) are often used.
• Do not use unit under any special environment where oil, steam and
sulfuric gas exist.
• It is recommended to fence round the outdoor unit in order to
prevent any person or animal from accessing the outdoor unit.
• If installation site is area of heavy snowfall, then the following
directions should be observed.
- Make the foundation as high as possible.
- Fit a snow protection hood.
• Select installation location considering following conditions to avoid
bad condition when additionally performing defrost operation.
- Install the outdoor unit at a place well ventilated and having a lot of
sunshine in case of installing the product at a place With a high
humidity in winter (near beach, coast, lake, etc.)
(Ex : Rooftop where there is always sunshine.)
ALTERNATIVE REFRIGERANT R410A
The refrigerant R410A has the property of higher operating pressure in
comparison with R22.
Therefore, all materials have the characteristics of higher resisting
pressure than R22 ones and this characteristic should also be
considered during the installation.
R410A is an azeotrope of R32 and R125 mixed at 50:50, so the ozone
depletion potential (ODP) of R410A is 0.
OUTDOOR UNITS INFORMATIONINSTALLATION PROCESS

6
ENGLISH
Select installation location of the HR unit suitable for following
conditions
- Avoid a place where rain may enter since the HR unit is for indoor.
- Sufficient service space must be obtained.
- Refrigerant pipe must not exceed limited length.
- Avoid a place subject to a strong radiation heat from other heat
source.
- Avoid a place where oil spattering, vapor spray or high frequency
electric noise is expected.
- Install the unit at a place in which it is not affected by operation noise.
(Installation within cell such as meeting room etc. may disturb
business due to noise.)
- Place where refrigerant piping, drain piping and electrical wiring
works are easy.
2 Series
3 Series
■ Unit: mm(inch)
No. Part Name
Description
PRHR042A
PRHR032A
PRHR083A
PRHR063A
PRHR043A
PRHR033A
PRHR022A
PRHR023A
1Low pressure Gas
pipe connection port
Ø 28.58 (1-1/8)
Brazing connection
Ø 22.2 (7/8) Brazing
connection
2High pressure Gas
pipe connection port
Ø 22.2 (7/8) Brazing
connection
Ø 19.05 (3/4) Brazing
connection
3Liquid pipe
connection port
Ø 15.88 (5/8) Brazing
connection
(PRHR042A)
Ø 9.52 (3/8) Brazing
connection
Ø 12.7 (1/2) Brazing
connection
(PRHR032A)
4Indoor unit Gas pipe
connection port
Ø 15.88 (5/8) Brazing
connection
Ø 15.88 (5/8) Brazing
connection
5Indoor unit Liquid
pipe connection port
Ø 9.52 (3/8) Brazing
connection
Ø 9.52 (3/8) Brazing
connection
6 Control box - -
7 Hanger metal M10 or M8 M10 or M8
NOTE
!
• Be sure to install the inspection door at the control box side.
• If reducers are used, servicing space must be increased equal to
reducer's dimension.
For Heat Recovery Installation
54
6
419 (16-1/2)
61
(2-13/32)
137
(5-13/32)
124 (4-7/8)
128 (5-1/32)
30
(1-3/16)
60
(2-3/8)
More than
300 (11-13/16)
(Servicing space)
More than
450 (17-23/32)
(Servicing space)
More than 100 (3-15/16)
More than 100 (3-15/16)
(Servicing space)
(Servicing space)
More than 100 (3-15/16)
(Servicing space)
More than 100 (3-15/16)
More than 100 (3-15/16)
(Servicing space)
(Servicing space)
More than
300 (11-13/16)
More than
300 (11-13/16)
(Servicing space) (Servicing space)
More than 100 (3-15/16)
(Servicing space)
453 (17-27/32)
174
(6-27/32)
174
(6-27/32)
182
(7-5/32)
218 (8-19/32)
Inspection door
(servicing space)
481 (18-15/16)
1
2
3
7
450 (17-23/32)
450 (17-23/32)
345 (13-19/32)
345 (13-19/32)
345 (13-19/32)
300(11-13/16)
300(11-13/16) more
300(11-13/16)
254(10) more
(Servicing space) (Servicing space)
(Servicing space) (Servicing space)
500(19-11/16)
7
311(12-1/4)
6(1/4) more (Serviceing space)
6(1/4) more (Serviceing space)
126(4-31/32)
147(5-23/32)
6
54
19(3/4) 55(2-5/32)
389(15-5/16)
92
(3-5/8)
176(6-15/16)
Inspection door
(servicing space)
500(19-11/16)
254(10)
1
2
3
150(5-29/32) 486(19-1/8) 150(5-29/32)
165(6-1/2)
218(8-19/32)
300(11-13/16) more
300(11-13/16) more
300(11-13/16) more
254(10) more
(Servicing space) (Servicing space)
(Servicing space) (Servicing space)
7
311(12-1/4)
809(31-27/32)
793(31-7/32)
160
(6-5/16) 160
(6-5/16)
218(8-19/32)
165
(6-1/2)
1
2
3
19(3/4)
55(2-5/32)
389(15-5/16)
92(3-5/8) 176(6-15/16)
147(5-23/32)
126(4-31/32) 5
4
6
254(10)
Inspection door
(servicing space)
800(31-1/2)
6(1/4) more (Serviceing space)
6(1/4) more (Serviceing space)
Air inlet grille
500mm
(19-11/16inch)
[Unit:mm(inch)]
Turn the air outlet side toward the
building's wall, fence or windbreak screen.
When installing the outdoor unit in a place that is constantly exposed to a
strong wind like a coast or on a high story of a building, secure a normal
fan operation by using a duct or a wind shield.
• Install the unit so that its discharge port faces to the wall of the
building.
Keep a distance 500mm(19-11/16inch) or more between the unit and
the wall surface.
• Supposing the wind direction during the operation season of the air
conditioner, install the unit so that the discharge port is set at right
angle to the wind direction.
WARNING
!
Fix the outdoor unit firmly with anchor bolt or it may fall and hurt
people. (refer to ‘Foundation for installation’)

7
ENGLISH
• The following values are the least space for installation. If any service
area is needed for service according to field circumstance, obtain
enough service space.
• The unit of values is mm.
In case of obstacles on the suction side
1. Stand alone installation
100(3-15/16)
or more
1000 (39-1/4)
or more
100(3-15/16)
or more
500(19-5/8)
or less
100(3-15/16)
or more 100(3-15/16)
or more
100(3-15/16)
or more
500(19-5/8)
or less
1000 (39-1/4)
or more
150(5-29/32)
or more 100(3-15/16)
or more
150(5-29/32)
or more
2. Collective installation
100(3-15/16)
or more 100(3-15/16)
or more
1000 (39-1/4)
or more
300(11-13/16)
or more
500(19-5/8)
or less
1000 (39-1/4)
or more
100(3-15/16)
or more 100(3-15/16)
or more
1000 (39-1/4)
or more
300(11-13/16)
or more
Unit:mm(inch)
Unit:mm(inch)
In case of obstacles on the discharge side
1. Stand alone installation
500(19-5/8) or more
500(19-5/8)
or less
1000 (39-1/4)
or more
500(19-5/8) or more
1000 (39-1/4)
or more
100(3-15/16)
or more
500(19-5/8) or less
1000 (39-1/4)
or more
1000 (39-1/4)
or more
100(3-15/16)
or more
H
L
100(3-15/16)
or more
500(19-5/8)
or more
1000 (39-1/4)
or more
500(19-5/8) or less
L
H
250 (9-7/8)
or more
1000 (39-1/4)
or more
2. Collective installation
In case of obstacles on the suction and the
discharge side
Obstacle height of discharge side is higher than the unit
1. Stand alone installation
Unit:mm(inch)
Unit:mm(inch)
L > H L > H
2. Collective installation
Unit:mm(inch)
L
H
1000 (39-1/4)
or more 300(11-13/16)
or more
100(3-15/16)
or more
500(19-5/8)
or less
L
H
1250(49-1/4)
or more 300(11-13/16)
or more
1000 (39-1/4)
or more
100(3-15/16)
or more
L > H L > H
INSTALLATION SPACE

8
ENGLISH
Unit:mm(inch)
H
L
100(3-15/16)
or more
500(19-5/8)
or less
500(19-5/8) or less
H
L
1000 (39-1/4)
or more 300(11-13/16)
ormore
1000 (39-1/4)
or more
H
L
300(11-13/16)
or more
100(3-15/16)
or more
1500(59)
or more
300(11-13/16)
or more
500(19-5/8)
or less
1000 (39-1/4)
or more
H
L
1500(59)
or more
100(3-15/16)
or more
Obstacle height of discharge side is lower than the unit
1. Stand alone installation
2. Collective installation
L ≤HL≤H
L ≤HL≤H
Seasonal wind and cautions in winter
• Sufficient measures are required in a snow areas or severe cold
areas in winter so that product can be operated well.
• Get ready for seasonal wind or snow in winter even in other areas.
• Install a suction and discharge duct not to let in snow or rain.
• Install the outdoor unit in such a way that it should not come in
contact with snow directly.
If snow piles up and freezes on the air suction hole, the system may
malfunction. If it is installed at snowy area, attach the hood to the
system.
• The raised support platform must be high enough to allow the unit to
remain above possible snow drifts, and must be higher than the
maximum anticipated snowfall for the location.
• Where snow accumulated on the upper part of the Outdoor Unit by
more than 10 cm (3.9 inch), always remove snow for operation.
- Don't install the suction hole and discharge hole of the Outdoor
Unit facing the seasonal wind.
System(Ton) 3, 4, 5
Minimum intake area 1.2(15.5)
300mm
(11-13/16inch)
or more
Air guide
Air guide duct
Less than
Less than
20 degrees
20 degrees
Wind speed : 1.5m/s(4.9 ft/s)
Intake
area
150mm
(5-29/32inch)
or more
350mm
350mm
(13-25/32inch)
(13-25/32inch)
or more
or more
350mm
(13-25/32inch)
or more
Less than
20 degrees
Louver pitch
Louver pitch
100 mm
100 mm
(3-15/16inch)
(3-15/16inch)
or more
or more
Louver pitch
100 mm
(3-15/16inch)
or more
Unit : m2(ft2)
Secure minimum intake area
When the intake area is not secured can efficiency drop and products
may not be operating
• Minimum intake area (For reference)
Air guide work
In case of out door unit is located outdoor cabin of apartment or flats,
then the efficiency can drop and system pressure increases thus finally
damaging the compressor or other components in the system by heat
short circuit.
• Do not use bended louver. It disturbs the air circulation.
• The opening ratio is at least 80%
• Louver angle is 0-20 degree
• Louver pitch will be as more than 100mm(3.9 inch)
• If you have a insect control net, consider the shielded area and static
pressure loss
• Check the static pressure range of outdoor unit fan.
Then, install air guide in the range of static pressure.

9
ENGLISH
• When carrying the suspended, unit pass the ropes under the unit and
use the two suspension points each at the front and rear.
• Always lift the unit with ropes attached at four points so that impact
is not applied to the unit.
• Attach the ropes to the unit at an angle of 40° or less.
CAUTION
!
Be very careful while carrying the product.
• Do not have only one person carry product if it is more than
20 kg (44 lbs).
• PP bands are used to pack some products. Do not use them as
a mean for transportation because they are dangerous.
• Do not touch heat exchanger fins with your bare hands.
Otherwise you may get a cut in your hands.
• Tear plastic packaging bag and scrap it so that children cannot
play with it. Otherwise plastic packaging bag may suffocate
children to death.
• When carrying in Outdoor Unit, be sure to support it at four
points. Carrying in and lifting with 3-point
support may make Outdoor Unit unstable, resulting in a fall.
• Use 2 belts of at least 8 m (26.2 ft) long.
• Place extra cloth or boards in the locations where the casing
comes in contact with the sling to prevent damage.
•
Hoist the unit making sure it is being lifted at its center of gravity.
Air outlet grille Intake hole
Corner
Handle
Always hold the unit by the corners, as holding
it by the side intake holes on the casing may
cause them to deform.
Sub line
40° or less
A
WARNING
• Install at places where it can endure the weight and vibration/noise
of the outdoor unit.
• The outdoor unit support blocks at the bottom shall have width of at
least 100 mm (3-15/16 inch) under the Unit’s legs before being fixed.
• The outdoor unit support blocks should have minimum height of 200
mm (7-7/8 inch).
• Anchor bolts must be inserted at least 75 mm (2-15/16 inch).
• Fix the unit tightly with bolts as shown below so that unit will not fall
down due to earthquake or gust.
• Use the H-beam support as a base support
• Noise and vibration may occur from the floor or wall since vibration is
transferred through the installation part depending on installation
status. Thus, use anti-vibration materials (cushion pad) fully (The base
pad shall be more than 200 mm (7-7/8 inch)).
At least 100mm
(3-15/16inch)
At least 100mm
(3-15/16inch)
At least 100mm
(3-15/16inch)
At least 100mm
(3-15/16inch)
At least 100mm
(3-15/16inch)
At least 100mm
(3-15/16inch)
Center of the Unit
For outdoor units
should not be
supported only
by the corner
supports.
Center of the Unit
a
be e
cd
System(Ton) 3, 4, 5
a 950(37-11/32)
b 619(24-11/32)
c 330(13)
d 360(14-3/16)
e 165.5(6-17/32)
[Unit : mm(inch)]
At least 200mm
(7-7/8 inch)
Foundation for Installation
The location of the Anchor bolts
INSTALLATIONLIFTING METHOD

10
ENGLISH
Unit : mm (inch)
200(7-7/8)
75(2-15/16)
75(2-15/16)
200(7-7/8)
100(3-15/16)
ⒶThe corner part must be fixed firmly. Otherwise, the support for the
installation may be bent.
ⒷGet and use M10 Anchor bolt.
ⒸPut Cushion Pad between the outdoor unit and ground support for
the vibration protection in wide area.
ⒹSpace for pipes and wiring (Pipes and wirings for bottom side)
ⒺH-beam support
ⒻConcrete support
WARNING
!
• Install where it can sufficiently support the weight of the
outdoor unit.
If the support strength is not enough, the outdoor unit may drop
and hurt people.
• Install where the outdoor unit may not fall in strong wind or
earthquake.
If there is a fault in the supporting conditions, the outdoor unit
may fall and hurt people.
• Please take extra cautions on the supporting strength of the
ground, water outlet treatment(treatment of the water flowing
out of the outdoor unit in operation), and the passages of the
pipe and wiring, when making the ground support.
• Do not use tube or pipe for water outlet in the Base panel. Use
drainage instead for water outlet. The tube or pipe may freeze
and the water may not be drained.
Main cause of gas leakage is defect in flaring work. Carry out correct
flaring work in the following procedure.
Cut the pipes and the cable
- Use the accessory piping kit or the pipes purchased locally.
- Measure the distance between the indoor and the outdoor unit.
- Cut the pipes a little longer than measured distance.
- Cut the cable 1.5 m (4.92 ft) longer than the pipe length.
Pipe
Reamer
Point down
Copper
tube 90° Slanted Uneven Rough
Flaring work
- Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated dimension in the
table above.
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the flared section and do
flaring work again.
Burrs removal
- Completely remove all burrs from the cut cross section of pipe/tube.
- Put the end of the copper tube/pipe to downward direction as you
remove burrs in order to avoid to let burrs drop in the tubing.
Bar
Copper pipe
"A"
<Wing nut type> <Clutch type>
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged Cracked Uneven thickness
= Improper flaring =
Flare shape and flare nut tightening torque
Precautions when connecting pipes
- See the following table for flare part machining dimensions.
- When connecting the flare nuts, apply refrigerant oil to the inside and
outside of the flares and turn them three or four times at first. (Use
ester oil or ether oil.)
-
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 size
[mm (inch)]
Tightening Torque
N.m (lbs.ft) A [mm (inch)] Flare shape
Ø 9.52 (3/8) 38±4 (28±3.0) 12.8 (0.5)~13.2 (0.52)
90°±2
45°
±2
A
R=0.4~0.8
Ø 12.7 (1/2) 55±6 (41±4.4) 16.2 (0.64)~16.6 (0.65)
Ø 15.88 (5/8) 75±7 (55±5.2) 19.3 (0.76)~19.7(0.78)
CAUTION
!
• Be sure to remove the Pallet(Wood Support) of the bottom side
of the outdoor unit Base panel before fixing the bolt. It may
cause the unstable state of the outdoor settlement, and may
cause freezing of the heat exchanger resulting in abnormal
operations.
• Be sure to remove the Pallet(Wood Support) of the bottom side
of the outdoor unit before welding. Not removing Pallet(Wood
Support) causes hazard of fire during welding.
Pipe diameter
Inch (mm)
A inch (mm)
Wing nut type Clutch type
Ø 1/4 (Ø 6.35) 0.04~0.05(1.1~1.3)
0~0.02
(0~0.5)
Ø 3/8 (Ø 9.52) 0.06~0.07(1.5~1.7)
Ø 1/2 (Ø 12.7) 0.06~0.07(1.6~1.8)
Ø 5/8 (Ø 15.88) 0.06~0.07(1.6~1.8)
Ø 3/4 (Ø 19.05) 0.07~0.08(1.9~2.1)
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 location indicated A and B
• Put the screws through the nooses and screw them back tight
Pallet(Wood Support)
- Remove before Installation
A
B
C
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
Preparation of Piping

11
ENGLISH
Opening shutoff valve
1Remove the cap and turn the valve counter clockwise with the
hexagon wrench.
2Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may
break the valve body, as the valve is not a backseat type. Always
use the special tool.
3Make sure to tighten the cap securely.
Insulation of shutoff valve
1Use the heat insulation material for the refrigerant piping which has
an excellent heat-resistance (over 120 °C [248 °F]).
2Precautions in high humidity circumstance:
This air conditioner has been tested according to the "ISO
Conditions with Mist" and confirmed that there is not any default.
However, if it is operated for a long time in high humid atmosphere
(dew point temperature: More than 23 °C [73.4 °F]), water drops
are liable to fall. In this case, add heat insulation material according
to the following procedure:
Indoor unit
Thermal insulator
(accessory)
Fastening band
(accessory)
Refrigerant piping
Closing shutoff valve
1Remove the cap and turn the valve clockwise with the hexagon
wrench.
2Securely tighten the valve until the shaft contacts the main body seal.
3Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Tightening torque
Shut
off
valve
size
(mm
(inch))
Tightening torque N.m (lbs.ft) (Turn clockwise to close)
Shaft
(valve body)
Cap
(Valve lid) Service port
Flare nut
Gas line
piping
attached
to unit
Closed Opened Hexagonal
wrench
Ø 6.35
(1/4) 6.0±0.6
(4.4±0.4)
5.0±0.0
(3.7±0.4)
4 mm
(0.16 inch)
17.6±2.0
(13.0±1.5)
12.7±2
(9.4±1.5)
16±2
(12±1.5)
-
Ø 9.52
(3/8) 38±4 (28±3.0)
Ø 12.7
(1/2) 10.0±1.0 (7.4±0.7) 20.0±2.0 (14.8±1.5) 55±6 (41±4.4)
Ø 15.88
(5/8)
12.0±1.2
(8.9±0.9) 5 mm
(0.24 inch)
25.0±2.5
(18.4±1.8)
75±7
(55±5.1)
Ø 19.05
(3/4)
14.0±1.4
(10.3±1.0) 110±10 (81.1±7.4)
Ø 22.2
(7/8) 30.0±3.0
(22.1±2.2) 8 mm (0.31 inch) -
Ø 25.4
(1)
25±3
(18.5±2.2)
CAUTION
!
• Always use a charge hose for service port connection.
•
After tightening the cap, check that no refrigerant leaks are present .
• 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.
• When connecting a flare nut, coat the
flare(inner and outer faces) with oil for
R410A(PVE) and hand tighten the nut
3 to 4 turns as the initial tightening.
Union
Refrigerant piping on three principles
Drying Cleanliness Airtight
Should be no
moisture inside No dust inside. There is no refrigerant leakage
Items
Moisture
Dust
Leakage
Cause failure
- Significant
hydrolysis of
refrigerant oil
- Degradation of
refrigerant oil
- Poor insula’tion of
the compressor
- Do not cold and
warm
- Clogging of EEV,
Capillary
- Degradation of
refrigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
- Clogging of EEV,
Capillary
- Gas shortages
- Degradation of
refrigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
Countermeasure
- No moisture in the
pipe
- Until the
connection is
completed, the
plumbing pipe
entrance should be
strictly controlled.
- Stop plumbing at
rainy day.
- Pipe entrance
should be taken
side or bottom.
- When removal burr
after cutting pipe,
pipe entrance
should be taken
down.
- Pipe entrance
should be fitted
cap when pass
through the walls.
- No dust in the
pipe.
- Until the
connection is
completed, the
plumbing pipe
entrance should be
strictly controlled.
- Pipe entrance
should be taken
side or bottom.
- When removal burr
after cutting pipe,
pipe entrance
should be taken
down.
- Pipe entrance
should be fitted
cap when pass
through the walls.
- Airtightness test
should be.
- Brazing operations
to comply with
standards.
- Flare to comply
with standards.
- Flange connections
to comply with
standards.
- Heat insulation material to be prepared:
EPDM (Ethylene Propylene Diene Methylene)-over 120 °C
[248 °F] the heat-resistance temperature.
- Add the insulation over 10 mm [0.39 inch] thickness at high
humidity environment.
Plumbing materials and storage methods
Pipe must be able to obtain the specified thickness and should be
used with low impurities.
Also when handling storage, pipe must be careful to prevent a
fracture, deformity and wound.
Should not be mixed with contaminations such as dust, moisture.

12
ENGLISH
Regulator
Nitrogen gas
Pressure 0.02 MPa
(2.9 psi) less
Auxiliary valve
Taping
(Should not
contain air)
Welding Point
Note) should not block the outlet side.
When the internal pressure in pipe is abo
ve the atmospheric pressure, pinhole is
occurred and it is a leakage cause.
Oxide scale
Nitrogen
CAUTION
!
• Always use the nitrogen.(not use oxygen, carbon dioxide, and a
Chevron gas): Please use the following nitrogen pressure 0.02 MPa
(2.9 psi) Oxygen - Promotes oxidative degradation of refrigerant oil.
Because it is flammable, it is strictly prohibited to use Carbon
dioxide - Degrade the drying characteristics of gas Chevron Gas -
Toxic gas occurs when exposed to direct flame.
•
Always use a pressure reducing valve.
• Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is observed. In
fact, due to the organic acids generated by oxidation of the
alcohol contained in the anti-oxidants, ants nest corrosion
occurs. (causes of organic acid →alcohol + copper + water +
temperature)
Refrigerant
Charging Port
Liquid pipe
High Pressure gas pipe
Low Pressure gas pipe
C
B
A
- Refer to the table below and install with the correct pipe diameter.
Heat Recovery Heat Pump
A[mm(inch)] Ø15.88(5/8) -
B[mm(inch)] Ø9.52(3/8) -
C[mm(inch)] Ø19.05(3/4) -
ARUB***GSS4
ARUM***GSS5
Low Pressure
Gas pipe C
B
A
Liquid pipe
Refrigerant
Charging Port
Service Port
High Pressure
Gas pipe
- Refer to the table below and install with the correct pipe diameter.
* In case of heat pump installation, please weld with the proper Low
pressure Gas pipe included with product.
Heat Recovery Heat Pump
A[mm(inch)] Ø9.52(3/8) Ø9.52(3/8)
B[mm(inch)] Ø15.88(5/8) Ø15.88(5/8)
C[mm(inch)] Ø19.05(3/4) Not Used*
For Heat Recovery System Installation
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the branching
pipes, and the refrigerant pipe coming out of the outdoor unit is divided at the end
to connect to each indoor unit. Flare connection for the indoor unit, and welding
connection for the outdoor pipe and the branching parts. (Including HR Unit)
* Pipes and wires should be purchased separately for installation of the product.
- Use hexagonal wrench to open/close the valve.
REFRIGERANT PIPING
INSTALLATION
Nitrogen substitution method
Welding, as when heating without nitrogen substitution a large
amount of the oxide film is formed on the internal piping.
The oxide film is a caused by clogging EEV, Capillary, oil hole of
accumulator and suction hole of oil pump in compressor.
It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing
air by nitrogen gas.
When welding plumbing pipe, the work is required.

13
ENGLISH
WARNING
!
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.
CAUTION
!
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
Pipe
connection
from left
side Pipe
connection
from right
side
Parallel
pipe
connection
WARNING
!
Before brazing work, remove gas in the HR Unit by cutting the
three pipes in the small circles on the figure.
If not, it may cause injuries.
Remove the caps before connecting pipes.
Six-sided Nut
(M10 or M8)
Hanger metal
Hanger metal
Hanger metal
Flat washer
Flat washer
Flat washer
(M10)
Hanging bolt
Hanging bolt
Hanging bolt
(M10 or M8)
A
Insulation
CAUTION
!
Whenever connecting the indoor units with the HR unit, install the
indoor units in numerical order from No.1.
Ex) In case of installing 3 indoor units : No. 1, 2, 3 (O), No. 1, 2, 4 (X),
No.1, 3, 4 (X), No.2, 3, 4 (X).
1234
Gas pipe
Gas pipe
Liquid pipe
Liquid pipe
HR Unit
Low pressure
Gas pipe
Liquid pipe High pressure
Gas pipe
2 Series
3 Series
PRHR022A
(2 branches)
PRHR032A
(3 branches)
PRHR042A
(4 branches)
PRHR023A
(2 branches)
PRHR033A
(3 branches)
PRHR063A
(6 branches)
PRHR083A
(8 branches)
PRHR043A
(4 branches)
Type of HR Unit
Select an HR unit according to the number of the indoor units to be
installed. HR units are classified into 3 types by the number of
connectable indoor units.
Ex) Installation of 6 indoor units
Consists of HR unit for 4 branches and HR unit for 2 branches.
Installation of Outdoor Unit, HR Unit, Indoor Unit
Refrigerant Pipe
3 pipes are connected to the HR unit from the outdoor unit, classified
into liquid pipe, low pressure gas pipe and high pressure gas pipe
depending on status of refrigerant passing through the pipe.
You must connect 3 pipes from outdoor unit to HR unit.
For connection between indoor unit and HR unit, you must connect
both liquid pipe and gas pipe from the HR unit to the indoor unit. In this
case, connect them to the indoor unit starting from No.1 connection
port of the HR unit (the port number is displayed on ports of the HR
unit). Use auxiliary flare as annexed parts in connection to the indoor
unit.
Installation procedure for HR unit
1Using an insert-hole-in- anchor, hang the hanging bolt.
2Install a hexagon nut and a flat washer (locally-procured)to the
hanging bolt as shown in the figure in the bottom, and fit the main
unit to hang on the hanger metal.
3 After checking with a level that the unit is level, tighten the hexagon nut.
* The tilt of the unit should be within ±5° in front/back and left/right.
4This unit should be installed suspended from ceiling and side A
should always be facing up.
5Insulate not used pipes completely as shown in the figure.

14
ENGLISH
WARNING
!
• A branch pipe of HR unit allows up to 14.5kW(48kBtu/h) based
on cooling capacity of the indoor unit. (up to 14.5kW(48kBtu/h)
for max installation)
• The maximum total capacity of indoor units connected to a
PRHR043(A) HR unit is 58kW(192kBtu/h).
• The maximum number of indoor units connected to a
PRHR043(A) HR unit are 32 indoor units. (The Maximum indoor
units per a branch pipe of HR unit are 8 indoor units)
• There is not operate “Auto-changeover” & “Mode override”
function in the zoning group.
• When there are operating indoor units on cooling(heating) mode,
another indoor units aren’t changed on heating(cooling) mode in
the zoning group.
• For detailed instructions on installing the HR Unit, see the
installation manual included with the HR Unit.
[Reducers for indoor unit and HR unit]
* For more information, refer accessory installation manual.
Unit : mm (inch)
Models High pressure
-
Gas pipe
Low pressure
Liquid pipe
Indoor unit
reducer
HR unit
reducer
PRHR022A
PRHR023A
OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 15.88(5/8) Ø 12.7(1/2)
Ø 6.35(1/4)OD 9.52(3/8)
Ø 6.35(1/4)OD 9.52(3/8)
OD 19.05(3/4) Ø 15.88(5/8)
OD 12.7(1/2) Ø 9.52(3/8)
Ø12.7(1/2)
OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 15.88(5/8) Ø 12.7(1/2)
PRHR032A
PRHR042A
PRHR033A
PRHR043A
PRHR063A
PRHR083A
OD 19.05(3/4) Ø 15.88(5/8)
OD 28.58(1-1/8) Ø 22.2(7/8) Ø 19.05(3/4)
OD 15.88(5/8) Ø 12.7(1/2) Ø 9.52(3/8)
OD 12.7(1/2) Ø 9.52(3/8)
OD 15.88(5/8) Ø 12.7(1/2)
HR unit HR unit
sealing
Changeover under control Auto changeover Changeover under control
Zoning control group 1 Zoning control group 2
(Max. 8 Indoor Units)
(Max. 8 Indoor Units)
HR unit PRHR022A
PRHR023A
PRHR032A
PRHR033A
PRHR042A
PRHR043A
PRHR063A
PRHR083A
Low pressure
gas pipe Ø 22.2 (7/8) Ø 28.58 (1-1/8) Ø 28.58 (1-1/8)
High pressure
gas pipe Ø 19.05 (3/4) Ø 22.2 (7/8) Ø 22.2 (7/8)
Liquid pipe Ø 9.52 (3/8) Ø 12.7 (1/2) Ø 15.88 (5/8)
NOTE
!
• A connection to un-neighboring pipes is forbidden.
Do not link more than 2 outlets.
• The B8 unit, which has the largest capacity, must be connected
to the 1st and 2nd outlets of the 1st HR unit. Other B8 units can
be connected to any two neighboring outlets within one HR unit.
1st HR Unit 2nd HR Unit
2nd HR Unit1st HR Unit
4 3 2 1
B8
4 3 2 1
4 3 2 1
B8
4 3 2 1
2nd HR Unit1st HR Unit
4 3 2 1
B8
(92k) (38k)
BG
4 3 2 1
B8
(72k)(34k)
BH
1st HR Unit 2nd HR Unit
1 2 3 4
B8
(96 k)(28 k)
BG
1 2 3 4
B8
(76 k)(21 k)
BH
Gas pipe Ø 15.88 (5/8)
Liquid pipe Ø 9.52 (3/8)
Brazing Type
1234
Remove caps on
The brazing part.
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
1st 2HR Unit nd HR Unit
4 3 2 1
BG
(38k) (92k)
B8
(48k)
BH
(72k)
B8
4 3 2 1
3 Series
Installation of Zoning Control
Some indoor unit can be connected to one port of HR unit.
Joint Method of HR Unit
(Big Duct : ARNU763B8-, ARNU963B8-)
Joint Method is required when the big duct chassis is installed. In Joint
Method, two neighboring outlets of one HR unit are linked by Y branch
pipe and connected to one indoor unit.
2 Series

15
ENGLISH
Outer diameter
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-5/8)
44.45
(1-3/4)
53.98
(2-1/8)
Minimum
thickness
[mm(inch)]
0.8
(0.03)
0.8
(0.03)
0.8
(0.03)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
1.1
(0.04)
1.21
(0.05)
1.35
(0.05)
1.43
(0.06)
1.55
(0.06)
2.1
(0.08)
6If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in
heating/cooling performance.
8A second branch cannot be made after a header.
(These are shown by .)
9The Multi V will stop due to an abnormality like excessive or
insufficient refrigerant. At such a time, always properly charge the
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
10 Never perform a pump down. This will not only damage the
compressor but also deteriorate the performance.
11 Never use refrigerant to perform an air purge. Always evacuate air
by using a vacuum pump.
To Outdoor Unit
Sealed Piping
A
A
B
A
B
2Commercially available piping often contains dust and other
materials. Always blow it clean with a dry inert gas.
3Use care to prevent dust, water or other contaminants from
entering the piping during installation.
4Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5Always use the branch piping set shown below, which are sold
separately.
Y branch
Header
4 branches 7 branches 10 branches
ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,
ARBLB23220
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
12 Always insulate the piping properly. Insufficient insulation will
result in a decline in heating/cooling performance, drip of
condensate and other such problems.
13 When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the
Outdoor and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
been completed.
14 Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or
damage to the compressor unit and flux can harm the copper
piping or refrigerant oil.
WARNING
!
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity of the indoor unit connected after branching, use an
appropriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
For Heat Pump System Installation
Not used
(keep closed) C
B
A
Liquid pipe
Refrigerant
Charging Port
Service Port
Gas pipe
- Refer to the table below and install with the correct pipe diameter.
* In case of heat pump installation, please weld with the proper Low
pressure Gas pipe included with product.
Heat Recovery Heat Pump
A[mm(inch)] Ø9.52(3/8) Ø9.52(3/8)
B[mm(inch)] Ø15.88(5/8) Ø15.88(5/8)
C[mm(inch)] Ø19.05(3/4) Not Used*
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare
connection for the indoor unit, and welding connection for the outdoor
pipe and the branching parts.
* Pipes and wires should be purchased separately for installation of the
product.
- Use hexagonal wrench to open/close the valve.
hIn case of the heat pump system installation, be sure to maintain to
close no use pipe like below picture.
Caution
1Use the following materials for refrigerant piping.
- Material: Seamless phosphorous deoxidized copper pipe
- Wall thickness : Comply with the relevant local and national
regulations for the designed pressure 3.8 MPa
(551 psi). We recommend the following table as
the minimum wall thickness.

16
ENGLISH
To Outdoor Unit
Sealed Piping
A
A
B
9The Multi V will stop due to an abnormality like excessive or
insufficient refrigerant. At such a time, always properly charge the
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
10 Never perform a pump down. This will not only damage the
compressor but also deteriorate the performance.
11 Never use refrigerant to perform an air purge. Always evacuate air
by using a vacuum pump.
12 Always insulate the piping properly. Insufficient insulation will
result in a decline in heating/cooling performance, drip of
condensate and other such problems.
13 When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the
Outdoor and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
been completed.
14 Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or
damage to the compressor unit and flux can harm the copper
piping or refrigerant oil.
A
B
WARNING
!
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original
refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity of the indoor unit connected after branching, use an
appropriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
Outer diameter
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-5/8)
44.45
(1-3/4)
53.98
(2-1/8)
Minimum
thickness
[mm(inch)]
0.8
(0.03)
0.8
(0.03)
0.8
(0.03)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
0.99
(0.04)
1.1
(0.04)
1.21
(0.05)
1.35
(0.05)
1.43
(0.06)
1.55
(0.06)
2.1
(0.08)
2Commercially available piping often contains dust and other
materials. Always blow it clean with a dry inert gas.
3Use care to prevent dust, water or other contaminants from
entering the piping during installation.
4Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5Always use the branch piping set shown below, which are sold
separately.
Y branch
Header
4 branches 7 branches 10 branches
ARBLN01621, ARBLN03321,
ARBLN07121, ARBLN14521,
ARBLN23220
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
6If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in
heating/cooling performance.
8A second branch cannot be made after a header. (These are shown
by .)
WARNING
!
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.
CAUTION
!
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
Caution
1Use the following materials for refrigerant piping.
- Material: Seamless phosphorous deoxidized copper pipe
- Wall thickness : Comply with the relevant local and national
regulations for the designed pressure 3.8 MPa
(551 psi). We recommend the following table as
the minimum wall thickness.

17
ENGLISH
- Pipe connections can be done on the front side or on the side
according to the installation environments.
- Be sure to let 0.2 kgf/cm2(2.8 psi) Nitrogen flow in the pipe when
welding.
- If Nitrogen was not flown during welding, many oxidized membranes
may form inside the pipe and disturb the normal operations of valves
and condensers.
For Heat Recovery System Installation
CAUTION
!
• Do not give damage to the pipe/base during the Knock Out
work.
• Proceed to pipe work after removing burr after Knock Out work.
• Perform sleeve work to prevent damage to the wire when
connecting wires using Knock Outs.
<High Pressure Gas pipe> <Low Pressure Gas pipe>
<Liquid pipe>
Wet towel
Removal Area for Liquid/Gas
pipe bottom side connections.
- Use the wet towel as shown in the below figure before welding
Remove leakage prevention cap
• Remove the leakage prevention cap attached to the outdoor unit
service valve before pipe work.
• Proceed the leakage prevention cap removal as follows:
- Verify whether the liquid/gas pipes are locked.
- Extract remaining refrigerant or air inside using the service port.
- Remove the leakage prevention cap
Service Port
Refrigerant
Charging Port
Liquid pipe
High Pressure gas pipe
Leakage prevention cap
Low Pressure gas pipe
Rear Side Pipe
Draw Out
Front Pipe
Draw Out Right Side Pipe
Draw Out
Refrigerant Pipe
Regulator
Nitrogen
Taping Valve
Nitrogen
Nitrogen
Direction
Direction
Nitrogen
Direction
ARUB***GSS4
Low Pressure
gas pipe
Liquid pipe
Refrigerant
Charging Port
Service Port
High Pressure
gas pipe
Leakage Prevention Cap
ARUM***GSS5
Preparation Work
- Use Knock Outs of Cover of the outdoor unit for Front/Right or Rear
pipe drawing outs.
PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT

18
ENGLISH
Pipe Knock Out for Liquid/Gas pipes
Method of drawing out pipes on the rear side
- Proceed with the pipe work as shown in the below figure for rear
side pie drawing out.
Pipe Knock Out for Liquid/Gas pipes
hPictures may differ depending on the model.
WARNING
• Refer to the HR unit PCB part for the valve group control setting.
• It is recommended that difference in pipe lengths between an HR
unit and indoor units, for example difference in length of a, b, c,
and d, be minimized. The larger difference in pipe lengths, the
more different performance between indoor units.
* If the large capacity indoor units (Over 5 HP; using over
Ø15.88(5/8)/9.52(3/8) are installed, it should be used the Valve
Group setting
!
Refrigerant piping system
Refrigerant Pipe Connection
Example : 12 Indoor Units connected
Ⓐ: Outdoor Unit
Ⓑ: Y branch
Ⓓ: Indoor Unit
Ⓖ: Header
Ⓗ: HR Unit
A1
H1
D
1
2D
D
D
3
4
C1
B
C2
C3
*
B1
B2
a
b
c
d
e
g
jk
x
lmn
sealing
f
i
H
h
"a"
“b”
D
A
H2
H4
G
H3
■Case 1 ("a")
: Maximum height is 15m(49ft) if you install with Y branch.
■Case 2 ("b")
: Maximum height is 5m(16ft) in serial connection of HR units.
D
5
D
6
D7
D
8
D
10
D
9D
11 D
12
Pipe Drawing Out during Single connection
Method of drawing out pipes on the front side and right side
- Proceed with the pipe work as shown in the below figure for front
side and right side pipe drawing out.

19
ENGLISH
• * : Assume equivalent pipe length of Y branch to be 500mm(19-
5/8inch), that of header to be 1000mm(39-1/4inch), calculation
purpose
• It is recommended that indoor unit is installed at lower position
than the header.
WARNING
When the any one (or both) of below conditions are satisfied, the
diameter of main pipe (A) must be increased according to below
table.
- The equivalent length between outdoor unit and the farthest
indoor unit is 90m(295ft) or more (Liquid, High pressure gas pipes
and Low pressure gas pipes are increased)
- The level difference (Outdoor unit ↔Indoor unit) is 50m(164ft) or
more (Only liquid pipe is increased)
!
Upward
outdoor unit
total capacity
Pipe diameter Pipe diameter when pipe
length is ≥90m(295 ft)
Ton
Liquid
mm(inch)
Low
pressure
gas pipe
mm(inch)
High
pressure
gas pipe
mm(inch)
Liquid
mm(inch)
Low
pressure
gas pipe
mm(inch)
High
pressure
gas pipe
mm(inch)
3,4,5 Ø9.52
(3/8)
Ø19.05
(3/4)
Ø15.88
(5/8)
Ø 12.7
(1/2)
Ø 22.2
(7/8)
Ø 19.05
(3/4)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Total pipe length = A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k+l+m+n
≤300m(984ft)
Refrigerant pipe diameter from branch to branch (B,C,D)
* If available on site, it use this size. Otherwise it can’t be increased.
Refrigerant pipe diameter from outdoor unit to first branch. (A)
LLongest pipe length *Equivalent pipe length
A+B+C3+D+k ≤150m(492ft) A+B+C3+D+k ≤175m(574ft)
lLongest pipe length after 1st branch
B+C+D+e ≤40m(131ft)
HDifference in height (Outdoor Unit ÷Indoor Unit)
H ≤50m(164ft)
hDifference in height (Indoor Unit ÷Indoor Unit)
h ≤15m(49ft)
"a", "b" Difference in height(HR unit ÷HR unit)
a ≤15m(49ft) , b ≤5m(16ft)
Downward Indoor
Unit total capacity
[kW(Btu/h)]
Liquid pipe [mm(inch)] Gas pipe [mm(inch)]
≤5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)
Upward outdoor
unit total capacity Pipe diameter
Ton Liquid mm(inch)
Low pressure gas
pipe
mm(inch)
High pressure gas
pipe
mm(inch)
3,4,5 Ø9.52
(3/8)
Ø19.05
(3/4)
Ø15.88
(5/8)

20
ENGLISH
Y branch, Header and HR unit connection pattern
Pattern 1
Pattern 2
Pattern 3
HR1
HR1
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h)
1
1
2
234567
HR2
2.1kW
(7kBtu/h) 2.1kW (7kBtu/h) 2.1kW (7kBtu/h) 2.1kW (7kBtu/h) 2.1kW (7kBtu/h) 7.25kW (24kBtu/h) 7.25kW (24kBtu/h)
3 4
B
HR1
1 2 3 4
Pattern 4
1 2 3 4
• The maximum total capacity of indoor
units is 58kW(192 kBtu/h).
• The maximum total capacity of a branch
pipe of HR unit is 14.5kW(48 kBtu/h).
• Impossible installation : Head branch pipe →HR unit
• Impossible installation : HR unit → Head branch
pipe →Y and Head branch pipe.
HR1
B
B
A
14.5kW
(48kBtu/h)
3.63kW
(12kBtu/h) 3.63kW (12kBtu/h) 3.63kW (12kBtu/h) 3.63kW (12kBtu/h)
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h)
Pattern 5
HR1
HR1
A
B
1 2
HR2
3 4
Pattern 6
AAA
12 345
14.5kW
(48kBtu/h)
7.25kW
(24kBtu/h) 7.25kW (24kBtu/h) 3.63kW (12kBtu/h) 3.63kW (12kBtu/h) 7.25kW (24kBtu/h)
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h)
Pattern 7
Pattern 8
HR1
A
A
A
1 2
• * : Serial connection of HR units : Capacity sum of indoor units ≤192 kBtu/h
• * : Maximum indoor units per a branch are 8 indoor units
HR2
3 4
HR3
5 6
*
HR1
1 2
HR2
*
B
3 4 5 6 7 8
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h)
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h) 14.5kW (48kBtu/h)
14.5kW
(48kBtu/h) 14.5kW (48kBtu/h) 3.63kW
(12kBtu/h) 3.63kW (12kBtu/h) 3.63kW (12kBtu/h) 3.63kW (12kBtu/h)
7.25kW
(24kBtu/h) 7.25kW (24kBtu/h)
• Pipe installation from outdoor units to HR units
: 3 pipes(Low pressure Gas pipe, High pressure Gas pipe, Liquid pipe)
• Pipe installation from HR units to indoor units
: 2 pipes(Gas pipe, Liquid pipe)
B
A
1
HR1
Outdoor
Unit
Indoor Unit Y Branch pipe
Low pressure Gas pipe
High pressure Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Head Branch pipe
Indoor
Unit