Toshiba RAV-GM401ATJP-E User manual

AIR CONDITIONER (SPLIT TYPE)
Installation Manual
Outdoor Unit
Model name:
RAV-GM301ATP-E
RAV-GM301ATJP-E
RAV-GM401ATP-E
RAV-GM401ATJP-E
For commercial use
English

2-EN1-EN
– 1 –
Contents
1 Precautions for safety ......................................................... 4
2 Accessory parts............................................................... 9
3 Installation of R32 refrigerant air conditioner ................................... 9
4 Installation conditions ........................................................ 10
5 Refrigerant piping ............................................................ 13
6 Air purging................................................................... 14
7 Electrical work ............................................................... 17
8 Earthing...................................................................... 18
9 Finishing..................................................................... 18
10 Test run ...................................................................... 18
11 Annual maintenance.......................................................... 18
12 Air conditioner operating conditions .......................................... 18
13 Functions to be implemented locally .......................................... 18
14 Appendix..................................................................... 19
15 Specifications ................................................................ 21
Original instruction
ADOPTION OF R32 REFRIGERANT
This air conditioner adopts the HFC refrigerant (R32) which does not destroy the ozone layer.
This outdoor unit is designed exclusively for use with R32 refrigerant. Be sure to use in combination with a
R32 refrigerant indoor unit.

4-EN3-EN – 2 –
EN
Thank you for purchasing this Toshiba air conditioner.
Please read carefully through these instructions that contain important information which complies with the
Machinery Directive (Directive 2006/42/EC), and ensure that you understand them.
After reading these instructions, be sure to keep them in a safe place together with the Owner’s Manual and
Installation Manual supplied with your product.
Generic Denomination: Air Conditioner
Definition of Qualified Installer or Qualified Service Person
The air conditioner must be installed, maintained, repaired and removed by a qualified installer or qualified service
person. When any of these jobs is to be done, ask a qualified installer or qualified service person to do them for you.
A qualified installer or qualified service person is an agent who has the qualifications and knowledge described in
the table below.
Agent Qualifications and knowledge which the agent must have
Qualified installer
• The qualified installer is a person who installs, maintains, relocates and removes the air conditioners made
by Toshiba Carrier Corporation. He or she has been trained to install, maintain, relocate and remove the air
conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such
operations by an individual or individuals who have been trained and is thus thoroughly acquainted with the
knowledge related to these operations.
• The qualified installer who is allowed to do the electrical work involved in installation, relocation and
removal has the qualifications pertaining to this electrical work as stipulated by the local laws and
regulations, and he or she is a person who has been trained in matters relating to electrical work on the air
conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such
matters by an individual or individuals who have been trained and is thus thoroughly acquainted with the
knowledge related to this work.
• The qualified installer who is allowed to do the refrigerant handling and piping work involved in installation,
relocation and removal has the qualifications pertaining to this refrigerant handling and piping work as
stipulated by the local laws and regulations, and he or she is a person who has been trained in matters
relating to refrigerant handling and piping work on the air conditioners made by Toshiba Carrier Corporation
or, alternatively, he or she has been instructed in such matters by an individual or individuals who have
been trained and is thus thoroughly acquainted with the knowledge related to this work.
• The qualified installer who is allowed to work at heights has been trained in matters relating to working at
heights with the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been
instructed in such matters by an individual or individuals who have been trained and is thus thoroughly
acquainted with the knowledge related to this work.
Qualified service
person
• The qualified service person is a person who installs, repairs, maintains, relocates and removes the air
conditioners made by Toshiba Carrier Corporation. He or she has been trained to install, repair, maintain,
relocate and remove the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she
has been instructed in such operations by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to these operations.
• The qualified service person who is allowed to do the electrical work involved in installation, repair,
relocation and removal has the qualifications pertaining to this electrical work as stipulated by the local
laws and regulations, and he or she is a person who has been trained in matters relating to electrical work
on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed
in such matters by an individual or individuals who have been trained and is thus thoroughly acquainted
with the knowledge related to this work.
• The qualified service person who is allowed to do the refrigerant handling and piping work involved in
installation, repair, relocation and removal has the qualifications pertaining to this refrigerant handling and
piping work as stipulated by the local laws and regulations, and he or she is a person who has been trained
in matters relating to refrigerant handling and piping work on the air conditioners made by Toshiba Carrier
Corporation or, alternatively, he or she has been instructed in such matters by an individual or individuals
who have been trained and is thus thoroughly acquainted with the knowledge related to this work.
• The qualified service person who is allowed to work at heights has been trained in matters relating to
working at heights with the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or
she has been instructed in such matters by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to this work.
Definition of Protective Gear
When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves
and “safety” work clothing.
In addition to such normal protective gear, wear the protective gear described below when undertaking the special
work detailed in the table below.
Failure to wear the proper protective gear is dangerous because you will be more susceptible to injury, burns,
electric shocks and other injuries.
Work undertaken Protective gear worn
All types of work Protective gloves
‘Safety’ working clothing
Electrical-related
work
Gloves to provide protection for electricians
Insulating shoes
Clothing to provide protection from electric shock
Work done at heights
(50 cm or more) Helmets for use in industry
Transportation of
heavy objects Shoes with additional protective toe cap
Repair of outdoor unit Gloves to provide protection for electricians
Center of gravity
(Unit: mm)
140
225
285

6-EN5-EN
– 3 –
Warning indication Description
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect all remote
electric power supplies
before servicing.
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect all remote electric power supplies before
servicing.
WARNING
Moving parts.
Do not operate unit with grille
removed.
Stop the unit before the servicing.
WARNING
Moving parts.
Do not operate unit with grille removed.
Stop the unit before the servicing.
CAUTION
High temperature parts.
You might get burned
when removing this panel.
CAUTION
High temperature parts.
You might get burned when removing this panel.
CAUTION
Do not touch the aluminum
fins of the unit.
Doing so may result in injury.
CAUTION
Do not touch the aluminium fins of the unit.
Doing so may result in injury.
CAUTION
BURST HAZARD
Open the service valves before
the operation, otherwise there
might be the burst.
CAUTION
BURST HAZARD
Open the service valves before the operation, otherwise there
might be the burst.
WARNING
Capacitor connected within
this disconnect or
downstream upon shutdown
wait 5 minutes to allow
capacitors to discharge
WARNING
Capacitor connected within this disconnect or downstream
upon shutdown wait 5 minutes to allow capacitors to
discharge.
These safety cautions describe important matters concerning safety to prevent injury to users or other people
and damages to property. Please read through this manual after understanding the contents below (meanings of
indications), and be sure to follow the description.
Indication Meaning of Indication
WARNING Text set off in this manner indicates that failure to adhere to the directions in the warning
could result in serious bodily harm (*1) or loss of life if the product is handled improperly.
CAUTION
Text set off in this manner indicates that failure to adhere to the directions in the caution
could result in slight injury (*2) or damage (*3) to property if the product is handled
improperly.
*1: Serious bodily harm indicates loss of eyesight, injury, burns, electric shock, bone fracture,
poisoning, and other injuries which leave aftereffect and require hospitalization or long-term
treatment as an outpatient.
*2: Slight injury indicates injury, burns, electric shock, and other injuries which do not require
hospitalization or long-term treatment as an outpatient.
*3: Damage to property indicates damage extending to buildings, household effects, domestic livestock,
and pets.
Warning indications on the air conditioner unit
WARNING
(Risk of fire)
This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of
outdoor unit.
In case that refrigerant type is R32, this unit uses a flammable refrigerant.
If refrigerant leaks and comes in contact with fire or heating part, it will create
harmful gas and there is risk of fire.
Read the OWNER’S MANUAL carefully before operation.
Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION
MANUAL before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the
like.

8-EN7-EN – 4 –
EN
1Precautions for safety
The manufacturer shall not assume any liability for the damage
caused by not observing the description of this manual.
WARNING
General
• Before starting to install the air conditioner, read carefully
through the Installation Manual, and follow its instructions to
install the air conditioner.
• Only a qualified installer(*1) or qualified service person(*1) is
allowed to install the air conditioner. If the air conditioner is
installed by an unqualified individual, a fire, electric shocks,
injury, water leakage, noise and/or vibration may result.
• Do not use any refrigerant different from the one specified
for complement or replacement. Otherwise, abnormally high
pressure may be generated in the refrigeration cycle, which
may result in a failure or explosion of the product or an injury to
your body.
• When transporting the air conditioner, use a forklift and when
moving the air conditioner by hand, move the unit with 2 people.
• Before opening the intake grille of the indoor unit or valve cover
of the outdoor unit, set the circuit breaker to the OFF position.
Failure to set the circuit breaker to the OFF position may result
in electric shocks through contact with the interior parts. Only a
qualified installer(*1) or qualified service person(*1) is allowed
to remove the intake grille of the indoor unit or valve cover of
the outdoor unit and do the work required.
• Before carrying out the installation, maintenance, repair or
removal work, be sure to set the circuit breaker to the OFF
position. Otherwise, electric shocks may result.
• Place a “Work in progress” sign near the circuit breaker while
the installation, maintenance, repair or removal work is being
carried out. There is a danger of electric shocks if the circuit
breaker is set to ON by mistake.
• Only a qualified installer(*1) or qualified service person(*1) is
allowed to undertake work at heights using a stand of 50 cm or
more.
• Wear protective gloves and safety work clothing during
installation, servicing and removal.
• Do not touch the aluminum fin of the outdoor unit. You may
injure yourself if you do so. If the fin must be touched for some
reason, first put on protective gloves and safety work clothing,
and then proceed.
• Do not climb onto or place objects on top of the outdoor unit.
You may fall or the objects may fall off of the outdoor unit and
result in injury.
• When working at heights, use a ladder which complies with the
ISO 14122 standard, and follow the procedure in the ladder’s
instructions. Also wear a helmet for use in industry as protective
gear to undertake the work.
• When cleaning the filter or other parts of the outdoor unit, set
the circuit breaker to OFF without fail, and place a “Work in
progress” sign near the circuit breaker before proceeding with
the work.
• When working at heights, put a sign in place so that no-one will
approach the work location, before proceeding with the work.
Parts and other objects may fall from above, possibly injuring a
person below.
• You shall ensure that the air conditioner is transported in stable
condition. If any part of the product is broken, contact the
dealer.
• Do not modify the products. Do not also disassemble or modify
the parts. It may cause a fire, electric shock or injury.
• This appliance is intended to be used by expert or trained users
in shops, in light industry, or for commercial use by lay persons.

10-EN9-EN
– 5 –
About the refrigerant
• This product contains fluorinated greenhouse gases.
• Do not vent gases to the atmosphere.
• The appliance shall be stored in a room without continuously
operating ignition sources (for example: open flames, an
operating gas appliance or an operating electric heater).
• Do not pierce or burn refrigerant cycle parts.
• Do not use means to accelerate the defrosting process or to
clean, other than those recommended by the manufacturer.
• Be aware that refrigerants may not contain an odour.
• The refrigerant inside the unit is flammable. If the refrigerant
leaks in the room and comes in contact with fire from a burner,
a heater, or a cooker, it may result in fire or the formation of a
harmful gas.
• Turn off any combustible heating devices, ventilate the room,
and contact the dealer from which you purchased the unit.
• Do not use the unit until a service person confirms that the
portion from which the refrigerant leaked is repaired.
• When installing, relocating, or servicing the air conditioner, use
only the specified refrigerant (R32) to charge the refrigerant
lines. Do not mix it with any other refrigerant and do not allow
air to remain in the lines.
• Pipe-work shall be protected from physical damage.
• Compliance with national gas regulations shall be observed.
Selection of installation location
• If you install the unit in a small room, take appropriate measures
to prevent the refrigerant from exceeding the limit concentration
even if it leaks. Consult the dealer from whom you purchased
the air conditioner when you implement the measures.
Accumulation of highly concentrated refrigerant may cause an
oxygen deficiency accident.
• Do not install the air conditioner in a location that may be
subject to a risk of expire to a combustible gas. If a combustible
gas leaks and becomes concentrated around the unit, a fire
may occur.
• When transporting the air conditioner, wear shoes with
additional protective toe caps.
• When transporting the air conditioner, do not take hold of the
bands around the packing carton. You may injure yourself if the
bands should break.
• Do not place any combustion appliance in a place where it is
directly exposed to the wind of air conditioner, otherwise it may
cause imperfect combustion.
• Do not install the air conditioner in a poorly ventilated space that
is smaller than the minimum floor area (Amin).
This applies to:
• Indoor units
• Outdoor units installed
(example: winter garden, garage, machinery room, etc)
Refer to “14 Appendix - [2] Minimum floor area: Amin (m2)” to
determine the minimum floor area.

12-EN11-EN – 6 –
EN
Installation
• Install the air conditioner at enough strong places to withstand
the weight of the unit. If the strength is not enough, the unit may
fall down resulting in injury.
• Follow the instructions in the Installation Manual to install the
air conditioner. Failure to follow these instructions may cause
the product to fall down or topple over or give rise to noise,
vibration, water leakage, etc.
• The designated bolts (M10) and nuts (M10) for securing the
outdoor unit must be used when installing the unit.
• Install the outdoor unit property in a location that is durable
enough to support the weight of the outdoor unit.
Insufficient durability may cause the outdoor unit to fall, which
may result in injury.
• If refrigerant gas has leaked during the installation work,
ventilate the room immediately. If the leaked refrigerant gas
comes in contact with fire, noxious gas may be generated.
• The installation of pipe work shall be kept to a minimum.
Refrigerant piping
• Install the refrigerant pipe securely during the installation
work before operating the air conditioner. If the compressor
is operated with the valve open and without refrigerant pipe,
the compressor sucks air and the refrigeration cycles is over
pressurized, which may cause a injury.
• Tighten the flare nut with a torque wrench in the specified
manner. Excessive tighten of the flare nut may cause a crack in
the flare nut after a long period, which may result in refrigerant
leakage.
• For installation and relocation work, follow the instructions in
the Installation Manual and use tools and pipe components
specifically made for use with R32 refrigerant. If pipe
components not designed for R32 refrigerant are used and the
unit is not installed correctly, the pipes may burst and cause
damage or injuries. In addition, water leakage, electric shock, or
fire may result.
• Nitrogen gas must be used for the airtight test.
• The charge hose must be connected in such a way that it is not
slack.
Electrical wiring
• Only a qualified installer(*1) or qualified service person(*1) is
allowed to carry out the electrical work of the air conditioner.
Under no circumstances must this work be done by an
unqualified individual since failure to carry out the work properly
may result in electric shocks and/or electrical leaks.
• The appliance shall be installed in accordance with national
wiring regulations. Capacity shortages of the power circuit or an
incomplete installation may cause an electric shock or fire.
• Use wiring that meets the specifications in the Installation
Manual and the stipulations in the local regulations and laws.
Use of wiring which does not meet the specifications may give
rise to electric shocks, electrical leakage, smoking and/or a fire.
• Be sure to connect earth wire. (Grounding work)
Incomplete grounding causes an electric shock.
• Do not connect ground wires to gas pipes, water pipes, and
lightning rods or ground wires for telephone wires.
• After completing the repair or relocation work, check that the
ground wires are connected properly.
• Install a circuit breaker that meets the specifications in the
installation manual and the stipulations in the local regulations
and laws.

14-EN13-EN
– 7 –
• Install the circuit breaker where it can be easily accessed by the
agent.
• When installing the circuit breaker outdoors, install one which is
designed to be used outdoors.
• Under no circumstances must the power cable be extended.
Connection trouble in the places where the cable is extended
may give rise to smoking and/or a fire.
Test run
• Before operating the air conditioner after having completed
the work, check that the electrical parts control box cover of
the indoor unit and valve cover of the outdoor unit are closed,
and set the circuit breaker to the ON position. You may receive
an electric shock etc. if the power is turned on without first
conducting these checks.
• When you have noticed that some kind of trouble (such as
when an error display has appeared, there is a smell of burning,
abnormal sounds are heard, the air conditioner fails to cool or
heat or water is leaking) has occurred in the air conditioner, do
not touch the air conditioner yourself but set the circuit breaker
to the OFF position, and contact a qualified service person.
Take steps to ensure that the power will not be turned on (by
marking “out of service” near the circuit breaker, for instance)
until qualified service person arrives. Continuing to use the
air conditioner in the trouble status may cause mechanical
problems to escalate or result in electric shocks, etc.
• After the work has finished, be sure to use an insulation tester
set (500 V Megger) to check the resistance is 1 MΩor more
between the charge section and the non-charge metal section
(Earth section). If the resistance value is low, a disaster such as
a leak or electric shock is caused at user’s side.
• Upon completion of the installation work, check for refrigerant
leaks and check the insulation resistance and water drainage.
Then conduct a test run to check that the air conditioner is
operating properly.
• After the installation work, confirm that refrigerant gas does
not leak. If refrigerant gas leaks into the room and flows near
a fire source, such as a cooking range, noxious gas may be
generated.
Explanations given to user
• Upon completion of the installation work, tell the user where the
circuit breaker is located. If the user does not know where the
circuit breaker is, he or she will not be able to turn it off in the
event that trouble has occurred in the air conditioner.
• If you have discovered that the fan guard is damaged, do not
approach the outdoor unit but set the circuit breaker to the OFF
position, and contact a qualified service person(*1) to have the
repairs done. Do not set the circuit breaker to the ON position
until the repairs are completed.
• After the installation work, follow the Owner’s Manual to explain
to the customer how to use and maintain the unit.
Relocation
• Only a qualified installer(*1) or qualified service person(*1) is
allowed to relocate the air conditioner. It is dangerous for the air
conditioner to be relocated by an unqualified individual since a
fire, electric shocks, injury, water leakage, noise and/or vibration
may result.
• When carrying out the pump-down work shut down the
compressor before disconnecting the refrigerant pipe.
Disconnecting the refrigerant pipe with the service valve left
open and the compressor still operating will cause air, etc. to
be sucked in, raising the pressure inside the refrigeration cycle
to an abnormally high level, and possibly resulting in reputing,
injury, etc.

16-EN15-EN – 8 –
EN
CAUTION
This air conditioner adopts the HFC refrigerant (R32) which does
not destroy the ozone layer.
• R32 refrigerant has a high working pressure and is apt to be
affected by impurities such as water, oxidizing membrane, and
oils. Therefore, during installation work, be careful that water,
dust, previous refrigerant, refrigerating machine oil, or other
substances do not enter the R32 refrigeration cycle.
• Special tools for R32 or R410A refrigerant are required for
installation.
• For connecting pipes, use new and clean piping materials, and
make sure that water and/or dust does not enter.
Cautions for outdoor unit installation space
• In the event that the outdoor unit is installed in a small space
and refrigerant leaks, accumulation of highly concentrated
refrigerant may cause a fire hazard. Therefore, be sure to follow
the installation space instructions in the Installation Manual, and
provide open space on at least one of the four outdoor unit sides.
• In particular, when both the discharge and intake sides face walls
and obstacles are also placed on both sides of the outdoor unit,
take steps to provide space wide enough for a person to pass
(600 mm or more) on one side to prevent leaked refrigerant from
accumulating.
Building or wall
Building or wall
Obstacle
Obstacle
Outdoor unit
600 mm or more
To disconnect the appliance from main power supply
• This appliance must be connected to the main power supply by
means of a switch with a contact separation of at least 3 mm.
Do not wash air conditioners with pressure washers
• Electric leaks may cause electric shocks or fires.
(*1) Refer to the “Definition of Qualified Installer or Qualified
Service Person.”

18-EN17-EN
– 9 –
2Accessory parts 3Installation of R32 refrigerant air
conditioner
CAUTION
R32 refrigerant air conditioner installation
yThis air conditioner adopts the HFC refrigerant (R32) which does not destroy ozone layer.
Therefore, during installation work, make sure that water, dust, former refrigerant, or refrigerant oil does not enter
the R32 refrigerant air conditioner cycle. To prevent mixing of refrigerant or refrigerant oil, the sizes of connecting
sections of charge port on the main unit and installation tools are different from those of the conventional
refrigerant units.
Accordingly, special tools are required for the R32 or R410A refrigerant units. For connecting pipes, use new and
clean piping materials with high pressure fittings made for the R32 or R410A only, so that water and/or dust does
not enter.
yWhen using existing piping, refer to “14 APPENDIX - [1] Existing piping”.
Required Tools/Equipment and Precautions for use
Prepare the tools and equipment listed in the following table before starting the installation work.
Newly prepared tools and equipment must be used exclusively.
Legend
: Conventional tools (R32 or R410A)
: Prepared newly (Use for R32 only)
Tools / equipment Use How to use tools / equipment
Gauge manifold Vacuuming / charging refrigerant
and operation check
Conventional tools (R410A)
Charging hose Conventional tools (R410A)
Charging cylinder Can not be used Unusable (Use the electronic refrigerant charging
scale)
Gas leak detector Charging refrigerant Conventional tools (R32 or R410A)
Vacuum pump Vacuum drying
Conventional tools (R32 or R410A)
Usable if the backflow prevention adapter is
installed.
Vacuum pump with backflow
prevention function Vacuum drying Conventional tools (R32 or R410A)
Flare tool Flare machining of pipes Conventional tools (R410A)
Part name Q’ty Shape Usage
Installation Manual 1 This manual
Hand this directly to the customer.
(For other languages that do not appear in this Installation
Manual, please refer to the enclosed CD-R.)
CD-ROM 1 — Installation Manual
Drain nipple 1
Waterproof rubber cap 2

20-EN19-EN – 10 –
EN
4Installation conditions
Bender Bending pipes Conventional tools (R410A)
Refrigerant recovery equipment Refrigerant recovery Conventional tools (R32 or R410A)
Torque wrench Tightening flare nuts Conventional tools (R410A)
Pipe cutter Cutting pipes Conventional tools (R410A)
Refrigerant cylinder Charging refrigerant Prepared newly (Use for R32 only)
Welding machine and nitrogen
cylinder Welding pipes Conventional tools (R410A)
Electronic refrigerant charging
scale Charging refrigerant Conventional tools (R32 or R410A)
Refrigerant piping
R32 refrigerant
CAUTION
yIncomplete flaring may cause refrigerant gas leakage.
yDo not re-use flares. Use new flares to prevent refrigerant gas leakage.
yUse flare nuts that are included with the unit. Using different flare nuts may cause refrigerant gas leakage.
Use the following item for the refrigerant piping.
Material : Seamless phosphorous deoxidized copper pipe.
Ø6.35, Ø9.52, Ø12.7 Wall thickness 0.8 mm or more
Ø15.88 Wall thickness 1.0 mm or more
REQUIREMENT
When the refrigerant pipe is long, provide support brackets at intervals of 2.5 to 3 m to clamp the refrigerant pipe.
Otherwise, abnormal sound may be generated.
Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
<GM30, GM40>
Model
Length of refrigerant
pipe connected to
indoor / outdoor unit
Item
GM30
GM40 2 to 20 m
Addition of refrigerant
at the local site in
unnecessary for
refrigerant pipe length
up to 15 m.
If the refrigerant pipe
length exceeds 15 m.
Add refrigerant in
the amount given in
“Charging additional
refrigerant”
* Caution during addition of refrigerant.
Charge the refrigerant accurately. Overcharging may
cause serious trouble with the compressor.
yDo not connect a refrigerant pipe that is shorter than
2 m.
This may cause a malfunction of the compressor or
other devices.
Airtight test
1. Before starting an airtight test, further tighten the
spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 Mpa)
to conduct an airtight test.
3. Check for gas leaks using a leak tester for the HFC
refrigerant.
4. After the airtight test is completed, evacuate the
nitrogen gas.
Air purge
yTo purge air, use a vacuum pump.
yDo not use refrigerant charged in the outdoor unit to
purge air. (The air purge refrigerant is not contained
in the outdoor unit.)
Electrical wiring
yBe sure to fix the power wires and system
interconnection wires with clamps so that they do not
come into contact with the cabinet, etc.
Earthing
WARNING
Make sure that proper earthing is provided.
Improper earthing may cause an electric shock. For
details on how to check earthing, contact the dealer
who installed the air conditioner or a professional
installation company.
yProper earthing can prevent charging of electricity
on the outdoor unit surface due to the presence of a
high frequency in the frequency converter (inverter)
of the outdoor unit, as well as prevent electric shock.
If the outdoor unit is not properly earthed, you may
be exposed to an electric shock.
yBe sure to connect the earth wire. (grounding
work)
Incomplete grounding can cause an electric shock.
Do not connect ground wires to gas pipes, water
pipes, lightning rods or ground wires for telephone
wires.
Test run
Turn on the leakage breaker at least 12 hours before
starting a test run to protect the compressor during
startup.
CAUTION
Incorrect installation work may result in a malfunction
or complaints from customers.

22-EN21-EN
– 11 –
CAUTION
1Install the outdoor unit in a location where
the discharge air is not blocked.
2When an outdoor unit is installed in a
location that is always exposed to strong
winds like a coast or on the high stories of
a building, secure normal fan operation by
using a duct or wind shield.
3When installing the outdoor unit in a
location that is constantly exposed
to strong winds such as on the upper
stairs or rooftop of a building, apply the
windproofing measures referred to in the
following examples.
1) Install the unit so that its discharge port
faces the wall of the building.
Keep a distance 500 mm or more between
the unit and wall surface.
500 mm
2) Consider the wind direction during the
operational season of the air conditioner,
and install the unit so that the discharge port
is set at a right angle relative to the wind
direction.
Strong wind
Strong wind
yWhen using an air conditioner under low outside
temperature conditions (Outside temp: -5 °C or
lower) in COOL mode, prepare a duct or wind shield
so that it is not affected by the wind.
<Example>
Suction hood (Side)
Discharge hood
Discharge
Fin
Suction
Necessary space for
installation (Unit: mm)
Obstacle at rear side
Upper side is free
1. Single unit installation
150 or
more
2. Obstacles on both right and left sides
200 or
more
150 or
more
300 or
more
The height of the
obstacle should be
lower than the height
of the outdoor unit.
3. Serial installation of two or more units
150 or
more
300 or
more
300 or
more
300 or
more
200 or more
The height of the obstacle should be lower than the
height of the outdoor unit.
Obstacle also above unit
150 or
more
500 or
more
Installation location
WARNING
Install the outdoor unit properly in a location that
is durable enough to support the weight of the
outdoor unit.
Insufficient durability may cause the outdoor unit to
fall, which may result in injury.
Pay special attention when installing the unit onto a
wall surface.
CAUTION
Do not install the outdoor unit in a location that
is subject to combustible gas leaks.
Accumulation of combustible gas around the outdoor
unit may cause a fire.
Install the outdoor unit in a location that meets the
following conditions after the customer’s consent
is obtained.
yA well-ventilated location free from obstacles near
the air intakes and air discharge.
yA location that is not exposed to rain or direct
sunlight.
yA location that does not increase the operating noise
or vibration of the outdoor unit.
yA location that does not produce any drainage
problems from discharged water.
Do not install the outdoor unit in the following
locations.
yA location with a saline atmosphere (coastal area)
or one that is full of sulfide gas (hot-spring area)
(Special maintenance is required).
yA location subject to oil, vapor, oily smoke, or
corrosive gases.
yA location in which organic solvent is used.
yPlaces where iron or other metal dust is present. If
iron or other metal dust adheres to or collects on the
interior of the air conditioner, it may spontaneously
combust and start a fire.
yA location where high-frequency equipment
(including inverter equipment, private power
generator, medical equipment, and communication
equipment) is used (Installation in such a location
may cause malfunction of the air conditioner,
abnormal control or problems due to noise from such
equipment).
yA location in which the discharged air of the outdoor
unit blows against the window of a neighboring
house.
yA location where the operating noise of the outdoor
unit is transmitted.
yWhen the outdoor unit is installed in an elevated
position, be sure to secure its feet.
yA location in which drain water poses any problems.

24-EN23-EN – 12 –
EN
Obstacle in front
Above unit is free
1. Single unit installation
500 or
more
2. Serial installation of two or more units
1,000 or
more
Obstacle also at the above unit
1,000 or
more
1,000 or
more
Obstacles in both front and rear of unit
Open above and to the right and left of the unit.
The height of an obstacle in both the front and rear of
the unit, should be lower than the height of the outdoor
unit.
Standard installation
1. Single unit installation
150 or
more
1,000 or
more
2. Serial installation of two or more units
200 or
more
1,000
or
more
300 or
more
300 or
more
Serial installation in front and rear
Open above and to the right and left of the unit.
The height of an obstacle in both the front and rear of
the unit, should be lower than the height of the outdoor
unit.
Standard installation
1,000 or
more
300 or
more
200 or
more
1,500 or
more
2,000 or
more
Installation of outdoor unit
yBefore installation, check the strength and
horizontalness of the base so that abnormal sounds
do not emanate.
yAccording to the following base diagram, fix the base
firmly with the anchor bolts.
(Anchor bolt, nut: M10 × 4 pairs)
Ø25 Drain hole
90 90600
108
60
306 330
yAs shown in the figure below, install the foundation
and vibration-proof rubber pads to directly support
the bottom surface of the fixing leg that is in contact
with and underneath the bottom plate of the outdoor
unit.
* When installing the foundation for an outdoor unit
with downward piping, consider the piping work.
Absorb vibration
with vibration-proof
rubber pads
Fixing leg
Foundation
Correct
Bottom plate of
outdoor unit
Foundation
Correct
Support the bottom surface of the fixing
leg that is in contact with and underneath
the bottom plate of the outdoor unit.
Foundation
Incorrect
Do not support the
outdoor unit only
with the fixing leg.
If only the end of
the fixing leg is
supported, it may
deform.
Set the out margin of the anchor bolt to 15 mm or less.
15 or less
yWhen water is to be drained through the drain hose,
attach the following drain nipple and waterproof
rubber cap, and use the drain hose (Inner dia.:
16 mm) sold on the market. Also seal the screws
securely with silicone material, etc., to prevent water
from leaking. Some conditions may cause dewing or
dripping of water.
yWhen collectively draining discharged water
completely, use a drain pan.
Drain nipple Waterproof rubber cap
(2 pcs.)
Waterproof
rubber cap
Base plate
Drain nipple
For reference
If a heating operation is to be continuously performed
for a long time under the condition that the outdoor
temperature is 0 °C or lower, draining defrosted water
may be difficult due to the bottom plate freezing,
resulting in trouble with the cabinet or fan.
It is recommended to procure an anti-freeze heater
locally in order to safely install the air conditioner.
For details, contact the dealer.

26-EN25-EN
– 13 –
CAUTION
yDo not scratch the inner surface of the flared part
when removing burrs.
yFlare processing under the condition of scratches
on the inner surface of flare processing part will
cause refrigerant gas leak.
yCheck that the flared part is not scratched,
deformed, stepped, or flattened, and that there
are no chips adhered or other problems, after flare
processing.
yDo not apply refrigerating machine oil to the flare
surface.
Tightening of connecting part
1Align the centers of the connecting pipes
and fully tighten the flare nut with your
fingers. Then fix the nut with a wrench as
shown in the figure and tighten it with a
torque wrench.
Half union or packed valve Flare nut
Internally
threaded side
Externally
threaded side
Fix with wrench. Tighten with torque
wrench.
2As shown in the figure, be sure to use two
wrenches to loosen or tighten the flare nut
of the valve on the gas side. If you use a
single crescent, the flare nut cannot be
tightened to the required tightening torque.
On the other hand, use a single crescent to
loosen or tighten the flare nut of the valve on
the liquid side.
(Unit: N•m)
Outer dia. of copper pipe Tightening torque
6.4 mm (dia.) 14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm (dia.) 34 to 42 (3.4 to 4.2 kgf•m)
12.7 mm (dia.) 49 to 61 (4.9 to 6.1 kgf•m)
Flare nut
Wrench for work
Loosened
Cap
Tightened
Wrench for fixing
Valve at gas side
CAUTION
yDo not put the crescent wrench on the cap.
The valve may break.
yIf applying excessive torque, the nut may break
according to some installation conditions.
Incorrect
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• Therefore, using a torque wrench, tighten the flare
pipe connecting sections that connect the indoor/
outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas
leak, but also trouble with the refrigeration cycle.
Do not apply refrigerating machine oil to the
flared surface.
5Refrigerant piping
Optional installation parts
(Locally procured)
Parts name Q’ty
A
Refrigerant piping
Liquid side: Ø6.4 mm
Gas side: Ø9.5, 12.7 mm
One each
BPipe insulating material
(polyethylene foam, 6 mm thick) 1
CPutty, PVC tape One each
Refrigerant piping connection
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Reusable mechanical connectors and flared
joints are not allowed indoors. When mechanical
connectors are reused indoors, sealing parts shall
be renewed.
When flared joints are reused indoors, the flare
part shall be refabricated.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Piping connection
(Unit: mm)
RAV-
Liquid side Gas side
Outer
diameter Thickness Outer diameter Thickness
GM30 Ø6.4 0.8 Ø9.5 0.8
GM40 Ø6.4 0.8 Ø12.7 0.8
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Use the flare nuts supplied with the air conditioner
or those for R32.
Insert a flare nut into the pipe, and flare the pipe.
Use the flare nuts supplied with the air conditioner
or flare nuts for R32 or R410A.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
B
Rigid (Clutch type)
Outer dia. of
copper pipe
R32/R410A tool
used
Conventional
tool used
6.4
0 to 0.5 1.0 to 1.59.5
12.7
Flaring dia. size: A (Unit: mm)
A
Outer dia. of copper pipe A +0
–0.4
6.4 9.9
9.5 13.2
12.7 16.6
* In case of flaring for R32/R410A with the
conventional flare tool, pull the tool out approx.
0.5 mm more than that for R22 to adjust it to the
specified flare size.
The copper pipe gauge is useful for adjusting the
projection margin size.

28-EN27-EN – 14 –
EN
6Air purging
Airtight test
After completing the refrigerant piping work, perform an airtight test. Connect a nitrogen gas cylinder and
pressurize the pipes with nitrogen gas as follows to conduct the airtight test.
VLVH
Charge port
Low pressure gauge High pressure gauge
Gauge manifold
Pressure reducing valve
Nitrogen gas
CAUTION
Never use oxygen, flammable gas,
or noxious gas for the airtight test.
Gas leak check
Step 1....Pressurize to 0.5 MPa (5 kg/cm²G) for 5 minutes or longer. Major leaks can be discovered.
Step 2....Pressurize to 1.5 MPa (15 kg/cm²G) for 5 minutes or longer.
Step 3....Pressurize to 4.15 MPa (42 kg/cm²G) for 24 hours. ................ Micro leaks can be discovered.
(However, note that when the ambient temperature differs during pressurization and after 24 hours, the pressure
will change by approximately 0.01 MPa (0.1 kg/cm²G) per 1°C, so this should be compensated.)
If the pressure drops in steps 1 through 3, check the connections for leakage.
Check for leaks with foaming liquid, etc., take steps to fix the leaks such as brazing the pipes again and
tightening the flare nuts, and then perform the airtight test again.
* After the airtight test is completed, evacuate the nitrogen gas.
Refrigerant pipe length
Single
Model Allowable pipe length (m) Height difference (Indoor-outdoor H) (m)
Total length L Indoor unit: Upper Outdoor unit: Lower
GM30 20 10 10
GM40 20 10 10
Model Pipe diameter (mm) Number of bent portions
Liquid side Gas side
GM30 Ø6.4 Ø9.5 10 or less
GM40 Ø6.4 Ø12.7 10 or less
L
H
Figure of Single
Indoor unit
Outdoor unit

30-EN29-EN
– 15 –
Vacuum pump
As shown in the figure, connect the charge hose after
the manifold valve is closed completely.
↓
Attach the connecting port of the charge hose with a
projection to push the valve core (setting pin) to the
charge port of the set.
↓
Open Handle Low fully.
↓
Turn ON the vacuum pump. (*1)
↓
Loosen the flare nut of the packed valve (Gas side)
a little to check that the air passes through. (*2)
↓
Retighten the flare nut.
↓
Execute vacuuming until the compound pressure gauge
indicates –101 kPa (–76 cmHg). (*1)
↓
Close Handle Low completely.
↓
Turn OFF the vacuum pump.
↓
Leave the vacuum pump as it is for 1 or 2 minutes, and
check that the indicator of the compound pressure gauge
does not return.
↓
Open the valve stem or valve handle fully.
(First, at liquid side, then gas side)
↓
Disconnect the charge hose from the charge port.
↓
Tighten the valve and caps of the charge port securely.
*1: Use the vacuum pump, vacuum pump adapter, and gauge
manifold correctly referring to the manuals supplied with
each tool before using them.
Check that the vacuum pump oil is filled up to the specified
line of the oil gauge.
*2: When air is not charged, check again whether the
connecting port of the discharge hose, which has a
projection to push the valve core, is firmly connected to the
charge port.
How to open the valve
Fully open the valves of the outdoor unit. (First fully
open the valve on the liquid side, and then fully open
the valve on the gas side.)
* Do not open or close the valves when the ambient
temperature is -20°C or less. Doing so may damage
the valve O-rings and result in refrigerant leakage.
Liquid side, gas side
Open the valve with hexagon wrench.
[Hexagonal wrench is required.]
Hexagonal wrench size
Liquid side Gas side
GM30 4 mm 4 mm
GM40 4 mm 4 mm
Valve handling precautions
yOpen the valve stem until it strikes the stopper.
It is unnecessary to apply further force.
ySecurely tighten the cap with a torque wrench.
Cap tightening torque
Valve size
Ø6.4 mm 14 to 18 N•m
(1.4 to 1.8 kgf•m)
Ø9.5 mm 14 to 18 N•m
(1.4 to 1.8 kgf•m)
Ø12.7 mm 33 to 42 N•m
(3.3 to 4.2 kgf•m)
Charge port 14 to 18 N•m
(1.4 to 1.8 kgf•m)
Replenishing refrigerant
This model is a 15 m chargeless type that does not
need to have its refrigerant replenished for refrigerant
pipes up to 15 m. When a refrigerant pipe longer than
15 m is used, add the specified amount of refrigerant.
Refrigerant replenishing procedure
1. After vacuuming the refrigerant pipe, close the
valves and then charge the refrigerant while the air
conditioner is not working.
2. When the refrigerant cannot be charged to the
specified amount, charge the required amount of
refrigerant from the charge port of the valve on the
gas side during cooling.
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the
refrigerant composition varies, which disables normal
operation.
Air purge
With respect to the preservation of the terrestrial
environment, adopt “Vacuum pump” to purge air
(Evacuate air in the connecting pipes) when installing
the unit.
yDo not discharge the refrigerant gas to the
atmosphere to preserve the terrestrial environment.
yUse a vacuum pump to discharge the air (nitrogen,
etc.) that remains in the set. If air remains, the
capacity may decrease.
For the vacuum pump, be sure to use one with a
backflow preventer so that the oil in the pump does not
backflow into the pipe of the air conditioner when the
pump stops.
(If oil in the vacuum pump is put in an air conditioner
including R32, it may cause trouble with the
refrigeration cycle.)
Compound pressure gauge Pressure gauge
Gauge manifold
valve
Handle High
(Keep fully closed)
Charge hose
(For R32/R410A)
Vacuum pump adapter
for counterflow
prevention
(For R32/R410A)
Vacuum
pump
Charge port
(Valve core
(Setting pin))
Charge hose
(For R32/R410A)
Handle Low
–101 kPa
(–76 cmHg)
Packed valve at gas side

32-EN31-EN – 16 –
EN
Charging additional refrigerant
Figure of Single
Indoor unit
Outdoor unit
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* R1 to R3 are the lengths of the pipes shown in the figures above (unit: m).
Single
Diameter of connecting pipe
(liquid side)
Amount of additional
refrigerant per meter (g/m) Amount of additional refrigerant (g) =
Amount of refrigerant charged for main pipe
Rα
Ø6.4 20 α× (R−20)
Gas leak inspection
Use a leak detector manufactured specially for HFC refrigerant (R32, R410A, R134a, etc.) to perform
the R32 gas leak inspection.
* Leak detectors for conventional HCFC refrigerant (R22, etc.) cannot be used, as the sensitivity drops to
approximately 1/40 when used for HFC refrigerant.
yR32 has a high working pressure, so failure to perform the installation work properly may result in gas leaks
such as when the pressure rises during operation. Be sure to perform leak tests on the piping connections.
Insulating the Pipes
yThe temperatures at both the liquid side and gas side will be low during cooling so in order to prevent
condensation, be sure to insulate the pipes at both of these sides.
yInsulate the pipes separately for the liquid side and gas side.
Valve cover
Outdoor unit inspection locations
REQUIREMENT
Be sure to use an insulating material which can withstand temperatures above 120°C for the gas side pipe since
this pipe will become very hot during heating operations.

34-EN33-EN
– 17 –
How to wire
1. Remove the valve cover from the outdoor unit.
2. Connect the power supply wires and system interconnection wires to the terminal block of the electrical control
box.
3. Tighten the screws of the terminal block, connect the wires matching the terminal numbers (Do not apply
tension to the connecting section of the terminal block.)
4. Attach the terminal cover.
yWhen connecting the system interconnection wire to the outdoor unit terminal, prevent water from coming into
the outdoor unit.
yInsulate the unsheathed cords (conductors) with electrical insulation tape. Process them so that they do not
touch any electrical or metal parts.
yFor system interconnection wires, do not use a wire joined to another on the way.
Use wires long enough to cover the entire length.
Terminal block
Power wire
Connecting wire
Screw
Stripping length power cord and connecting wire
LN
123
Earth wire Earth wire
System interconnection wire Power supply wire
10
10 10
10
4040 3030
(mm)
7Electrical work
CAUTION
yAn installation fuse must be used for the power
supply line of this air conditioner.
yIncorrect / incomplete wiring may lead to an
electrical fire or smoke.
yPrepare an exclusive power supply for the air
conditioner.
yThis product can be connected to the mains power.
Fixed wire connections:
A switch that disconnects all poles and has a
contact separation of at least 3 mm must be
incorporated in the fixed wiring.
yBe sure to use the cord clamps attached to the
product.
yDo not damage or scratch the conductive core
or inner insulator of the power and system
interconnection wires when peeling them.
yUse the power and system interconnection wires
with specified thicknesses, specified types and
protective devices required.
1Remove valve cover screw.
2Pull the valve cover downward to remove it.
Valve cover
Power supply wire
System
interconnection
wires
Wiring between indoor unit
and outdoor unit
The dashed lines show on-site wiring.
L
N
1
2
3
1
2
3
Input power
(Main circuit)
(System
interconnection wires)
Remote
controller
Indoor unit
Earth
Circuit
breaker
Outdoor unit
yConnect the system interconnection wires to the
identical terminal numbers on the terminal block of
each unit.
Incorrect connection may cause a failure.
For the air conditioner, connect a power wire with the
following specifications.
Model RAV- GM30 GM40
Power supply 220-240 V~, 50 Hz
220 V~, 60 Hz
Maximum running
current 7.90 A 9.20 A
Installation fuse rating 15.0 A 15.0 A
Power supply wire H07 RN-F or 60245 IEC 66
(1.5 mm² or more)
System interconnection
wires
H07 RN-F or 60245 IEC 66
(1.0 mm² or more)

36-EN35-EN – 18 –
EN
12 Air conditioner operating conditions
For proper performance, operate the air conditioner under the following temperature conditions:
Cooling operation Dry bulb temp. –15 °C to 46 °C
Heating operation Wet bulb temp. –15 °C to 24 °C
If air conditioner is used outside of the above conditions, safety protection may work.
13 Functions to be implemented locally
Handling existing pipe
When using the existing pipe, carefully check for the following:
yWall thickness (within the specified range)
yScratches and dents
yWater, oil, dirt, or dust in the pipe
yFlare looseness and leakage from welds
yDeterioration of copper pipe and heat insulator
Cautions for using existing pipe
yDo not reuse a flare nut to prevent gas leaks.
Replace it with the supplied flare nut and then process it to a flare.
yBlow nitrogen gas or use an appropriate means to keep the inside of the pipe clean. If discolored oil or much
residue is discharged, wash the pipe.
yCheck welds, if any, on the pipe for gas leaks.
When the pipe corresponds to any of the following, do not use it. Install a new pipe instead.
yThe pipe has been opened (disconnected from indoor unit or outdoor unit) for a long period.
yThe pipe has been connected to an outdoor unit that does not use refrigerant R32, R410A.
yThe existing pipe must have a wall thickness equal to or larger than the following thicknesses.
Reference outside
diameter (mm) Wall thickness (mm)
Ø6.4 0.8
Ø9.5 0.8
Ø12.7 0.8
yDo not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.
8Earthing
WARNING
Be sure to connect the earth wire. (grounding work)
Incomplete grounding may cause an electric shock.
Connect the earth wire properly following applicable technical standards.
Connecting the earth wire is essential to preventing electric shock and to reducing noise and electrical charges
on the outdoor unit surface due to the high-frequency wave generated by the frequency converter (inverter) in the
outdoor unit.
If you touch the charged outdoor unit without an earth wire, you may experience an electric shock.
9Finishing
After the refrigerant pipe, inter-unit wires, and drain pipe have been connected, cover them with finishing tape and
clamp them to the wall with off-the-shelf support brackets or their equivalent.
Keep the power wires and system interconnection wires off the valve on the gas side or pipes that have no heat
insulator.
10 Test run
yTurn on the leakage breaker at least 12 hours before starting a test run to protect the compressor during
startup.
To protect the compressor, power is supplied from the 220-240 VAC input to the unit to preheat the compressor.
yCheck the following before starting a test run:
yThat all pipes are connected securely without leaks.
yThat the valve is open.
If the compressor is operated with the valve closed, the outdoor unit will become overpressurized, which may
damage the compressor or other components.
If there is a leak at a connection, air can be sucked in and the internal pressure further increases, which may
cause a burst or injury.
yOperate the air conditioner in the correct procedure as specified in the Owner’s Manual.
11 Annual maintenance
For an air conditioning system that is operated on a regular basis, cleaning and maintenance of the indoor /
outdoor units are strongly recommended.
As a general rule, if an indoor unit is operated for about 8 hours daily, the indoor / outdoor units will need to be
cleaned at least once every 3 months. This cleaning and maintenance should be carried out by a qualified service
person.
Failure to clean the indoor / outdoor units regularly will result in poor performance, icing, water leaking and even
compressor failure.

38-EN37-EN
– 19 –
Are there scratches or dents on the existing pipes?
Is it possible to operate the existing air conditioner?
yAfter the existing air conditioner is operated in
cooling mode for approx. 30 minutes or longer,*
recover the refrigerant.
yRefer to “13 Refrigerant recovery”
yFor cleaning the pipes and recovering oil
yRefrigerant recovery: Pump down method
yRemove the existing air conditioner from the piping
and carry out flushing (nitrogen pressure 0.5 MPa)
to remove any remains inside of the pipe.
Connect the indoor / outdoor units to the existing
pipe.
yUse a flare nut attached to the main unit for the
indoor / outdoor units. (Do not use the flare nut of
the existing pipe.)
yRe-machine the flare machining size to size for
R32.
y(Airtight test), Vacuum dry, Refrigerant charge, Gas
leak check
Test run
Was largely discolored oil or a large quantity
of remains discharged? (When the oil deteriorates,
the color of the oil changes to a muddy or
black color.)
Existing pipes: Cannot be used.
yUse new pipes.
Clean the pipes or use new pipes.
Piping necessary to change the flare nut / machining
size due to pipe compression
1) Flare nut width: H
H
(mm)
Copper pipe outer
diameter Ø6.4 Ø9.5 Ø12.7
For R32, R410A 17 22 26
For R22 Same as above 24
2) Flare machining size: A
A
(mm)
Copper pipe outer
diameter Ø6.4 Ø9.5 Ø12.7
For R32, R410A 9.1 13.2 16.6
For R22 9.0 13.0 16.2
Becomes a little larger for R32/R410A
Do not apply refrigerator oil to the flare surface.
(If there is discharge of remains, it is judged that a
large quantity of remains are present.)
YES
YES
NO
NO
NO
YES
Nitrogen gas pressure 0.5 MPa
14 Appendix
Work instructions
The existing R22 and R410A piping can be reused for
our digital inverter R32 product installations.
WARNING
Confirming the existence of scratches or dents on
the existing pipes and confirming the reliability of
the pipe strength are conventionally referred to the
local site.
If the specified conditions can be cleared, it is
possible to update existing R22 and R410A pipes
to those for R32 models.
Basic conditions needed to reuse existing
pipes
Check and observe the presence of three conditions in
the refrigerant piping works.
1. Dry (There is no moisture inside of the pipes.)
2. Clean (There is no dust inside of the pipes.)
3. Tight (There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should
not be reused as they are. Clean the existing pipes
or exchange them with new pipes.
1. When a scratch or dent is heavy, be sure to use
new pipes for the refrigerant piping works.
2. When the existing pipe thickness is thinner than the
specified “Pipe diameter and thickness,” be sure to
use new pipes for the refrigerant piping works.
yThe operating pressure of R32 is high. If there is
a scratch or dent on the pipe or a thinner pipe is
used, the pressure strength may be inadequate,
which may cause the pipe to break in the worst
case.
* Pipe diameter and thickness (mm)
Pipe outer diameter Ø6.4 Ø9.5 Ø12.7
Thickness R32/R410A 0.8 0.8 0.8
R22
yIn case the pipe diameter is Ø12.7 mm or less
and the thickness is less than 0.7 mm, be sure to
use new pipes for the refrigerant piping works.
3. When the outdoor unit was left with the pipes
disconnected, or the gas leaked from the pipes and
the pipes were not repaired and refilled.
yThere is the possibility of rain water or air,
including moisture, entering the pipe.
4. When refrigerant cannot be recovered using a
refrigerant recovery unit.
yThere is the possibility that a large quantity of dirty
oil or moisture remains inside the pipes.
5. When a commercially available dryer is attached to
the existing pipes.
yThere is the possibility that copper green rust has
been generated.
6. When the existing air conditioner is removed after
refrigerant has been recovered.
Check if the oil is judged to be clearly different from
normal oil.
yThe refrigerator oil is copper rust green in color:
There is the possibility that moisture has mixed
with the oil and rust has been generated inside
the pipe.
yThere is discolored oil, a large quantity of residue,
or a bad smell.
yA large quantity of shiny metal dust or other wear
residue can be seen in the refrigerant oil.
7. When the air conditioner has a history of the
compressor failing and being replaced.
yWhen discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture
of foreign matter is observed, trouble will occur.
8. When temporary installation and removal of the air
conditioner are repeated such as when leased etc.
9. If the type of refrigerator oil of the existing air
conditioner is other than the following oil (Mineral
oil), Suniso, Freol-S, MS (Synthetic oil), alkyl
benzene (HAB, Barrel-freeze), ester series, PVE
only of ether series.
yThe winding-insulation of the compressor may
deteriorate.
NOTE
The above descriptions are results have been
confirmed by our company and represent our views on
our air conditioners, but do not guarantee the use of
the existing pipes of air conditioners that have adopted
R32/R410A in other companies.
Curing of pipes
When removing and opening the indoor or outdoor unit
for a long time, cure the pipes as follows:
yOtherwise rust may be generated when moisture or
foreign matter due to condensation enters the pipes.
yThe rust cannot be removed by cleaning, and new
pipes are necessary.
Placement
location Term Curing manner
Outdoors 1 month or more Pinching
Less than 1 month Pinching or taping
Indoors Every time