Toshiba MMY-SUG0801MT8P-E User manual

For commercial use
AIR CONDITIONER (MULTI TYPE)
Installation Manual
English
Outdoor Unit
Model name:
<Heat Recovery and Heat Pump Compatible Model>
MMY-SUG0801MT8P-E MMY-SUG1801MT8P-E
MMY-SUG1001MT8P-E MMY-SUG2001MT8P-E
MMY-SUG1201MT8P-E MMY-SUG2201MT8P-E
MMY-SUG1401MT8P-E MMY-SUG2401MT8P-E
MMY-SUG1601MT8P-E
MMY-SUG0801MT8JP-E MMY-SUG1801MT8JP-E
MMY-SUG1001MT8JP-E MMY-SUG2001MT8JP-E
MMY-SUG1201MT8JP-E MMY-SUG2201MT8JP-E
MMY-SUG1401MT8JP-E MMY-SUG2401MT8JP-E
MMY-SUG1601MT8JP-E
R32

2-EN1-EN
– 1 –
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.
Contents
Original instruction
Please read this Installation Manual carefully before installing the Air Conditioner.
• This Manual describes the installation method of the outdoor unit.
• For installation of the indoor unit, follow the Installation Manual attached to the indoor unit.
1 Precautions for safety................................................................................................... 3
2 Precautions of equipment using R32 refrigerant ....................................................... 9
General (Installation space / area) ............................................................................... 9
(1) Installation conditions for each requirement ...................................................... 16
1) Outdoor unit installation.................................................................................... 16
2) Indoor unit installation....................................................................................... 16
[ 1 ] [Confirmation of installation space and floor area]............................... 16
[ 2 ] [Safety measures]..................................................................................... 17
[ 3 ] [Leak detector installation] ...................................................................... 18
[ 4 ] [Safety Shut-off valve installation].......................................................... 19
[ 5 ] [To determine the limit on the amount of additional refrigerant] ......... 21
3 Accessory parts........................................................................................................... 23
4 Installation of R32 refrigerant air conditioner........................................................... 23
5 Selection of installation place.................................................................................... 24
6 Carrying in the outdoor unit....................................................................................... 25
7 Installation of the outdoor unit................................................................................... 26
8 Refrigerant piping........................................................................................................ 27
9 Electric wiring..............................................................................................................43
10 Address setting ........................................................................................................... 49
11 Communication setting............................................................................................... 53
12 Applicable control settings ........................................................................................ 69
13 How to set up the cooling only indoor unit............................................................... 70
14 Test run......................................................................................................................... 70
15 Troubleshooting .......................................................................................................... 74
16 Machine card and logbook ......................................................................................... 75

4-EN3-EN – 2 –
EN
Thank you for purchasing this Toshiba air conditioner.
Moreover, as this installation manual includes the important articles concerning the Machinery Directive
(Directive 2006/42/EC), please read through the manual and make sure you understand it. After installation, hand
the Owner’s Manual and Installation Manual (indoor unit and outdoor unit) to the customer and tell the customer to
store them.
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.
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
(*1)
• 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 (*1)
• 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 toecap
Repair of outdoor
unit Gloves to provide protection for electricians
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.

6-EN5-EN
– 3 –
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 through the
Installation Manual carefully, and follow the instructions to install
the air conditioner. Otherwise, falling down of the unit may occur,
or the unit may cause noise, vibration or water leakage.
• Only a qualified installer(*1) or qualified service person(*1) is
allowed to do installation work. If installation is carried out by
an unqualified individual, a fire, electric shocks, injury, water
leakage, noise and/or vibration may result.
• If using separately sold products, make sure to use Toshiba
specified products only. Using unspecified products may cause
fire, electric shock, water leak or other failure.
• 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.
• Before opening the service panel 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 service
panel 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 breakers for both the
indoor and outdoor units to the OFF position. Otherwise, electric
shock may result.
Warning indications on the air conditioner unit
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 aluminum 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.
CAUTION
Do not climb onto the
fan guard.
Doing so may result in injury.
CAUTION
Do not climb onto the fan guard.
Doing so may result in injury.
1 Precautions for safety

8-EN7-EN – 4 –
EN
• 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 or to remove the intake grille of the indoor unit to undertake
work.
• 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 height, put a sign in place so that no-one will
approach the work location before proceeding with the work.
Parts or other objects may fall from above, possibly injuring a
person below. Also, be sure that workers put on helmets.
• 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.
• The refrigerant used by this air conditioner is the R32.
• Do not power other equipment such as vacuum pump from the
outdoor unit. Doing so may cause a fire or a malfunction of the
air conditioner.
• Do not disassemble, modify or move the product yourself. Doing
so may cause fire, electric shock, injury or water leaks.
• This appliance is intended to be used by expert or trained users
in shops, in light industry, or for commercial use by lay persons.
• We do not take any responsibility on the local design.
Selection of installation location
• Due to the use of the mildly flammable refrigerant R32, there are
safety and legal installation conditions for installing equipment
such as indoor units, outdoor units, Flow Selector and Shut-off
valve units. Install each unit according to the section “Installation
conditions for each equipment”.
• Do not install in a location where flammable gas may leaks are
possible. If the gas should leak and accumulate around the unit,
it may ignite and cause a fire.
• When transporting the air conditioner, wear shoes with protective
toe caps, protective gloves and other protective clothing.
• When transporting the air conditioner, do not take hold of the
bands around the packing carton. You may injure yourself if the
bands break.
• Install the indoor unit at least 2.5 m above the floor level since
otherwise the users may injure themselves or receive electric
shocks if they poke their fingers or other objects into the indoor
unit while the air conditioner is running.
• 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 in location where operation sound of the outdoor
unit may cause a disturbance. (Especially at the boundary line
with a neighbor, install the air conditioner while considering the
noise)

10-EN9-EN
– 5 –
• 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, it may ignite the
R32 refrigerant and so noxious gas may be generated. For
prevention, install according to the section “Installation conditions
for each equipment”.
• When the air conditioner has been installed or relocated,
follow the instructions in the Installation Manual and purge
the air completely so that no gases other than the refrigerant
will be mixed in the refrigerating cycle. Failure to purge the air
completely may cause the air conditioner to malfunction.
• Nitrogen gas must be used for the airtight test.
• The charge hose must be connected in such a way that it is not
slack.
• If refrigerant gas leaked during the installation work, ventilate
the room immediately. If the leaked refrigerant gas comes in
contact with fire, it may ignite the R32 refrigerant and so noxious
gas may be generated. For prevention, Install according to the
section “Precautions of equipment using R32”.
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.
• When connecting the electrical wires, repairing the electrical
parts or undertaking other electrical jobs, wear gloves to provide
protection for electricians and from heat, insulating shoes and
clothing to provide protection from electric shocks. Failure to
wear this protective gear may result in electric shocks.
• When executing address setting, test run, or troubleshooting
through the checking window on the electrical control box, put on
insulated heat-proof gloves, insulated shoes and other clothing
to provide protection from electric shock. Otherwise you may
receive an electric shock.
Installation
• 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 or other failure.
• The designated bolts (M12) and nuts (M12) 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.
• Install the unit in the prescribed manner for protection against
strong wind and earthquake. Incorrect installation may result in
the unit falling down, or other accidents.
• Be sure to fix the screws back which have been removed for
installation or other purposes.
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.
• Ventilate the air if the refrigerant gas leaks during installation.
If the leaked refrigerant gas comes into contact with fire, toxic
gas may be produced.

12-EN11-EN – 6 –
EN
• 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.
• Check that the product is properly earthed. (grounding work)
Incomplete earthing may cause electric shock.
• Do not connect the earth line to a gas pipe, water pipe, lightning
conductor, or a telephone earth line.
• 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.
• 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 the power cable must not be extended.
Connection trouble in the places where the cable is extended
may give rise to smoking and / or a fire.
• Electrical wiring work shall be conducted according to law and
regulation in the community and Installation Manual.
Failure to do so may result in electrocution or short circuit.
• Do not supply power from the power terminal block equipped on
the outdoor unit to another outdoor unit. Capacity overflow may
occur on the terminal block and may result in fire.
• When carrying out electric connection, use the wire specified in
the Installation Manual and connect and fix the wires securely to
prevent them applying external force to the terminals. Improper
connection or fixing may result in fire.
Test run
• Before operating the air conditioner after having completed the
work, check that the electrical parts box cover of the indoor unit
and service panel of the outdoor unit are closed, and set the
circuit breaker to the ON position. You may receive an electric
shock 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 or other failure.
• After the work has finished, be sure to use an insulation tester
set (500V Megger) to check the resistance is 2MΩor 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.
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.

14-EN13-EN
– 7 –
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.
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.
Since the mildly flammable refrigerant R32 is used, for the
installation conditions and safety precautions for indoor units,
outdoor units, Flow Selector units, etc., refer to the following
“Precautions for using R32 refrigerant” and do the installation
works.
• If you have discovered that the fan grille 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 or other gas to
be sucked in, raising the pressure inside the refrigeration cycle to
an abnormally high level, and possibly resulting in rupture, injury
or other trouble.
• Never recover the refrigerant into the outdoor unit. Be sure to
use a refrigerant recovery machine to recover the refrigerant
when moving or repairing. It is impossible to recover the
refrigerant into the outdoor unit. Refrigerant recovery into the
outdoor unit may result in serious accidents such as explosion of
the unit, injury or other accidents.
(*1) Refer to the “Definition of Qualified Installer or Qualified
Service Person.”

16-EN15-EN – 8 –
EN
Precautions for using R32 refrigerant
Make sure installation, servicing, maintenance and repair comply
with instructions from TOSHIBA and with applicable legislation
(for example, national gas regulation) and are executed only by
authorized people.
These safety cautions describe important matters concerning
safety to prevent injury to users or other people and damages to
property. Please read though this manual after understanding the
contents below (meanings of indications), and be sure to follow the
description;
Meanings of symbols displayed on the 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.
WARNING
• Models that use refrigerant R32 and R410A have a different
charging port thread diameter to prevent erroneous charging with
refrigerant R22 and for safety.
• Do not use means to accelerate the defrosting process or to
clean, other than those recommended by the manufacturer.
• 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.
• Be aware that refrigerants may not contain an odor.
• The manufacturer may provide other suitable examples or may
provide additional information about the refrigerant odor.

18-EN17-EN
– 9 –
CAUTION
When a flammable refrigerant is used, all appliance shall be
charged with refrigerant at the manufacturing location or charged
on site as recommended by the manufacturer.
A part of an appliance that is charged on site, which requires
brazing or welding in the installation shall not be shipped with
a flammable refrigerant charge. Joints made in the installation
between parts of the refrigerating system, with at least one part
charged, shall be made in accordance with the following.
- A brazed, welded, or mechanical connection shall be made
before opening the valves to permit refrigerant to flow between
the refrigerating system parts. A vacuum valve shall be provided
to evacuate the interconnecting pipe and/or any uncharged
refrigerating system part.
- Refrigerant tubing shall be protected or enclosed to avoid
damage. Flexible refrigerant connectors (such as connecting
lines between the indoor and outdoor unit) that may be
displaced during normal operations shall be protected against
mechanical damage.
• Piping shall be protected from damage during installation,
operation and maintenance.
• When installing piping in the occupied space, protect the piping
from accidental damage.
• Check the piping as described in [8 Refrigerant piping]
[Airtightness test].
• Wherever possible, protection, piping and fixtures shall be
protected against the environment and weather resistance.
• You must prepare for long-term expansion and contraction of
piping.
• Indoor equipment and plumbing must be safely installed and
protected from accidental rupture of equipment or plumbing from
events such as furniture movements or home renovations.
General (Installation space / area)
• The installation of pipe-work shall be kept to a minimum.
• Pipe-work shall be protected from physical damage.
• The compliance with national gas regulations shall be observed.
• The mechanical connections shall be accessible for maintenance
purposes.
• In cases that require mechanical ventilation, ventilation openings
shall be kept clear of obstruction.
• When disposing of the product is used, be based on national
regulations with properly processed.
• The servicing shall be performed only as recommended by the
manufacturer.
• Where the appliance using flammable refrigerants is installed,
Be aware that;
- The appliance shall be stored in a well-ventilated area where
the room size corresponds to the room area as specified for
operation.
- The appliance shall be stored in a room without continuously
operating open flames (for example an operating gas
appliance) and ignition sources (for example an operating
electric heater).
- The appliance shall be stored so as to prevent mechanical
damage from occurring.
• Equipment piping in the occupied space shall be installed in such
a way to protect against accidental damage in operation and
service.
• Precautions shall be taken to avoid excessive vibration or
pulsation to refrigerating piping.
2 Precautions of equipment using R32
refrigerant

20-EN19-EN – 10 –
EN
• When installing the system that uses flammable refrigerant in a
non-ventilated space, it shall be installed in the large space or
with safety equipment as designated below, so as to prevent the
refrigerant from staying and causing a fire or explosion by the
refrigerant leak.
• Field-made refrigerant joints indoors shall be tightness tested.
The test method shall have a sensitivity of 5 grams per year of
refrigerant or better under a pressure of at least 0,25 times the
maximum allowable pressure. No leak shall be detected.
• The total refrigerant charge in the system cannot exceed the
requirements for minimum floor area of the smallest room that
is served. For minimum floor area requirements for indoor units,
see the Installation and Owner’s Manual of the outdoor unit.
• When connecting to an outdoor unit of the R32 refrigerant and
using a leak detector, always turn on the power of the indoor
unit after installation except during service in order to detect
refrigerant leakage and take safety measures.
• Precautions shall be taken to avoid excessive vibration or
pulsation to refrigerating piping.
• Only mechanical fittings can be used. (Example: Brazing + Flare
connection)
• Refrigerating systems shall use only permanent joints indoors
except for site-made joints directly connecting the indoor unit
to the refrigerant piping, or factory made mechanical joints in
compliance with ISO 14903.
Unventilated area
• The appliance shall be stored so as to prevent mechanical
damage from occurring.
• Protection devices, piping and fittings shall be protected as far
as possible against adverse environmental effects, for example,
the danger of water collecting and freezing in relief pipes or the
accumulation of dirt and debris.
• Provision shall be made for expansion and contraction of long
runs of piping.
• Piping in refrigerating systems shall be so designed and installed
to minimize the likelihood hydraulic shock damaging the system.
• Solenoid valves shall be correctly positioned in the piping to
avoid hydraulic shock.
• Install the system according to this IM and avoid the likelihood
hydraulic shock damaging the system.
• Solenoid valves shall not block in liquid refrigerant unless
adequate relief is provided to the refrigerant system low pressure
side.
• Install the system according to this IM so that it does not shut off
in the liquid refrigerant.
• Steel pipes and components shall be protected against corrosion
with a rustproof coating before applying any insulation.
• Flexible pipe elements shall be protected against mechanical
damage, excessive stress by torsion, or other forces. They
should be checked for mechanical damage annually.
• The indoor equipment and pipes shall be securely mounted and
guarded such that accidental rupture of equipment cannot occur
from such events as moving furniture or reconstruction activities.
• Where safety shut off valves are specified, the minimum room
area may be determined based on the maximum amount of
refrigerant that can be leaked as determined in Installation
Manual.
• Where safety shut off valves are specified, the location of the
valve in the refrigerating system relative to the occupied spaces
shall be as described Installation Manual.

22-EN21-EN
– 11 –
Information on servicing
1. Check to the area
• Prior to beginning work on systems containing flammable
refrigerants, safety checks are necessary to ensure that risk
of ignition is minimized. For repair to the refrigerating system,
the precautions in item 2 to 6 shall be complied with prior to
conducting work on the system.
2. Work procedure
• Work shall be undertaken under a controlled procedure so as
to minimize the risk of a flammable gas or vapor being present
while the work is being performed.
• When connecting to an outdoor unit of R32 refrigerant and
using a leak detector, the fan may automatically operate even
if the air conditioner is stopped when a refrigerant leak is
detected. Be careful not to get injured by the fan.
• All installers and others working in the local area shall be
instructed on the nature of work being carried out. Work in
confined spaces shall be avoided.
3. General work area
• All maintenance staff and others working in the local area shall
be instructed on the nature of work being carried out.
• Work in confined spaces shall be avoided.
• The area around the workspace shall be sectioned off.
• Ensure that the conditions within the area have been made
safe by control of flammable material.
• Only equipment approved by the manufacturer shall be used
for duct work.
4. Checking for presence of refrigerant
• The area shall be checked with an appropriate refrigerant
detector prior to and during work, to ensure the technician is
aware of potentially flammable atmospheres.
• Ensure that the leak detection equipment being used is
suitable for use with all applicable refrigerants, i.e. non
sparking, adequately sealed or intrinsically safe.
5. Presence of fire extinguisher
• If any hot work is to be conducted on the refrigeration
equipment or any associated parts, appropriate fire
extinguishing equipment shall be available on hand.
• Have a dry powder or CO2fire extinguisher adjacent to the
charging area.
6. No ignition sources
• No person carrying out work in relation to a refrigeration
system which involves exposing any pipe work shall use any
sources of ignition in such a manner that it may lead to the risk
of fire or explosion.
• All possible ignition sources including cigarette smoking,
should be kept sufficiently far away from the site of installation,
repairing, removing and disposal, during which refrigerant can
possibly be released to the surrounding space.
• Prior to work taking place, the area around the equipment is to
be surveyed to make sure that there are no flammable hazards
or ignition risks. “No Smoking” signs shall be displayed.
• Make sure that the exhaust port of the vacuum pump is not
close to the ignition source and that ventilation is possible.
7. Ventilated area
• Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting any
hot work.
• A degree of ventilation shall continue during the period that the
work is carried out.
• The ventilation should safely disperse any released refrigerant
and preferably expel it externally into the atmosphere.
8. Checks to the refrigeration equipment
• Where electrical components are being changed, installer shall
be fit for the purpose and to the correct specification.
• At all times the manufacturer’s maintenance and service
guidelines shall be followed. If in doubt consult the
manufacturer’s technical department for assistance.

24-EN23-EN – 12 –
EN
• The following checks shall be applied to installations using
flammable refrigerants.
- The charge size is in accordance with the room size within
which the refrigerant containing parts are installed.
- The ventilation machinery and outlets are operating
adequately and are not obstructed.
- If an indirect refrigerating circuit is being used, the secondary
circuit shall be checked for the presence of refrigerant.
- Marking to the equipment continues to be visible and legible.
Markings and signs that are illegible shall be corrected.
- Refrigeration pipe or components are installed in a position
where they are unlikely to be exposed to any substance which
may corrode refrigerant containing components, unless the
components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against
being so corroded.
9. Checks to electrical devices
• Repair and maintenance to electrical components shall include
initial safety checks and component inspection procedures.
• If a fault exists that could compromise safety, then no electrical
supply shall be connected to the circuit until it is satisfactorily
dealt with.
• If the fault cannot be corrected immediately but it is necessary
to continue operation, an adequate temporary solution shall be
used. This shall be reported to the owner of the equipment so
all parties are advised.
• Initial safety checks shall include;
- That capacitors are discharged to avoid possibility of sparking.
- That there no live electrical components and wiring are
exposed while charging, recovering or purging the system.
- That there is continuity of earth bonding.
10. Repairs to sealed components
• During repairs to sealed components, all electrical supplies
shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc.
• If it is absolutely necessary to have an electrical supply to
equipment during servicing, then a permanently operating form
of leak detection shall be located at the most critical point to
warn of a potentially hazardous situation.
• Particular attention shall be paid to the following to ensure that
by working on electrical components, the casing is not altered
in such a way that the level of protection is affected.
• This shall include damage to cables, excessive number of
connections, terminals not made to original specification,
damage to seals, incorrect fitting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to
the point that they no longer serve the purpose of preventing
the ingress of flammable atmospheres.
• Replacement parts shall be in accordance with the
manufacturer’s specifications.
NOTE
The use of silicon sealant may inhibit the effectiveness of some
types of leak detection equipment. Intrinsically safe components
do not have to be isolated prior to working on them.
11. Repair to intrinsically safe components
• Do not apply any permanent inductive or capacitance loads
to the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment in
use.
• Intrinsically safe components are the only types that can
be worked on while live in the presence of a flammable
atmosphere.

26-EN25-EN
– 13 –
• The test apparatus shall be at the correct rating.
• Replace components only with parts specified by the
manufacturer.
• Other parts may result in the ignition of refrigerant in the
atmosphere from a leak.
12. Cabling
• Check that cabling will not be subject to wear, corrosion,
excessive pressure, vibration, sharp edges or any other
adverse environmental effects.
• Check shall also take into account the effects of aging or
continual vibration from sources such as compressors or fans.
13. Detection of flammable refrigerants
• Under no circumstances shall potential sources of ignition be
used in the searching for or detection of refrigerant leaks.
• A halide torch (or any other detector using a naked flame) shall
not be used.
• Electronic leak detectors may be used to detect refrigerant
leaks but, in the case of flammable refrigerants, the sensitivity
may not be adequate, or may need re-calibration. (Detection
equipment shall be calibrated in a refrigerant-free area.)
• Ensure that the detector is not a potential source of ignition
and is suitable for the refrigerant used.
• Leak detection equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to the refrigerant
employed and the appropriate percentage of gas (25%
maximum) is confirmed.
• Leak detection fluids are also suitable for use with most
refrigerants but the use of detergents containing chlorine shall
be avoided as the chlorine may react with the refrigerant and
corrode containing chlorine.
• If a leak is suspected, all naked flames shall be removed /
extinguished.
• If a leakage of refrigerant is found which requires brazing, all of
the refrigerant shall be recovered from the system, or isolated
(by means of shut off valves) in a part of the system remote
from the leak.
14. Leak detection methods
• Electronic leak detectors shall be used to detect flammable
refrigerants leak, but the sensitivity may not be adequate,
or may need re-calibration. (Detection equipment shall be
calibrated in a refrigerant-free area.)
• Ensure that the detector is not a potential source of ignition
and is suitable for the refrigerant used.
• Leak detection equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to the refrigerant
employed and the appropriate percentage of gas
(25% maximum) is confirmed.
• Leak detection fluids are suitable for use with most refrigerants
but the use of detergents containing chlorine shall be avoided
as the chlorine may react with the refrigerant and corrode the
copper pipework.
• If a leak is suspected, all naked flames shall be removed /
extinguished.
• If a leakage of refrigerant is found which requires brazing, all of
the refrigerant shall be recovered from the system, or isolated
(by means of shut off valves) in a part of the system remote
from the leak.
• Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
15. Removal and evacuation
• When breaking into the refrigerant circuit to make repairs or
for any other purpose, Conventional procedures shall be used.
However, it is important that best practice is followed since
flammability is a consideration.
The following procedure shall be adhered to:
- remove refrigerant;

28-EN27-EN – 14 –
EN
- purge the circuit with inert gas;
- evacuate;
- purge again with inert gas;
- open the circuit by cutting or brazing;
• The refrigerant charge shall be recovered into the correct
recovery cylinders.
• The system shall be “Flushed” with OFN to render the unit
safe.
• This process may need to be repeated several times.
• Compressed air or oxygen shall not be used for purging
refrigerant systems.
• Flushing shall be achieved by breaking the vacuum in the
system with OFN and continuing to fill until the working
pressure is achieved, then venting to atmosphere, and finally
pulling down to a vacuum.
• This process shall be repeated until no refrigerant is within the
system.
• When the final OFN charge is used, the system shall be
vented down to atmospheric pressure to enable work to take
place.
• This operation is absolutely vital if brazing operations on the
pipe work are to take place.
• Ensure that the outlet for the vacuum pump is not close to any
ignition sources and that ventilation available.
16. Charging procedures
• In addition to conventional charging procedures, the following
requirements shall be followed.
- Ensure that contamination of different refrigerants does not
occur when using charging equipment.
- Hoses or lines shall be as short as possible to minimize the
amount of refrigerant contained in them.
- Cylinders shall be kept upright.
- Ensure that the refrigeration system is earthed prior to
charging the system with refrigerant.
- Label the system when charging is complete (if not already).
- Extreme care shall be taken not to overfill the refrigeration
system.
• Prior to recharging the system, it shall be pressure-tested with
the appropriate purging gas.
• The system shall be leak tested on completion of charging but
prior to commissioning.
• A follow up leak test shall be carried out prior to leaving the
site.
17. Decommissioning
• Before carrying out this procedure, it is essential that the
technician is completely familiar with the equipment and all its
details.
• It is recommended good practice that all refrigerants are
recovered safely.
• Prior to the task being carried out, an oil and refrigerant
sample shall be taken in case analysis is required to reuse of
reclaimed refrigerant.
• It is essential that electrical power is available before the task
is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that:
- Mechanical handling equipment is available, if required, for
handling refrigerant cylinders;
- All personal protective equipment is available and being used
correctly;
- The recovery process is supervised at all times by a
competent person;
- Recovery equipment and cylinders conform to the appropriate
standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that
refrigerant can be removed from various parts of the
system.

30-EN29-EN
– 15 –
f) Make sure that cylinder is situated on the scales before
recovery takes place.
g) Start the recovery machine and operate in accordance with
manufacturer’s instructions.
h) Do not overfill cylinders. (No more than 80% volume liquid
charge.)
i) Do not exceed the maximum working pressure of the
cylinder, even temporarily.
j) When the cylinders have been filled correctly and the
process completed, make sure that the cylinders and the
equipment are removed from site promptly and all isolation
valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another
refrigeration system unless it has been cleaned and
checked.
18. Labelling
• Equipment shall be labelled stating that it has been
decommissioned and emptied of refrigerant.
• The label shall be dated and signed.
• Ensure that there are labels on the equipment stating the
equipment contains flammable refrigerant.
19. Recovery
• When removing refrigerant from a system, either for servicing
or decommissioning, it is recommended good practice that all
refrigerants are removed safely.
• When transferring refrigerant into cylinders, ensure that only
appropriate refrigerant recovery cylinders are employed.
• Ensure that the correct number of cylinders for holding the
total system charge are available.
• All cylinders to be used are designated for the recovered
refrigerant and labelled for that refrigerant (i.e. special
cylinders for the recovery of refrigerant).
• Cylinders shall be complete with pressure-relief valve and
associated shut-off valves in good working order.
• Empty recovery cylinders are evacuated and, if possible,
cooled before recovery occurs.
• The recovery equipment shall be in good working order with
a set of instructions concerning the equipment that is at hand
and shall be suitable for the recovery of all appropriated
refrigerants.
• In addition, a set of calibrated weighing scales shall be
available and in good working order.
• Hoses shall be complete with leak-free disconnect couplings
and in good condition.
• Before using the recovery machine, check that it is in
satisfactory working order, has been properly maintained
and that any associated electrical components are sealed to
prevent ignition in the event of a refrigerant release.
• Consult manufacturer if in doubt.
• The recovered refrigerant shall be returned to the refrigerant
supplier in the correct recovery cylinder, and the relevant
waste transfer note arranged.
• Do not mix refrigerants in recovery units and especially not in
cylinders.
• If compressors or compressor oils are to be removed, ensure
that they have been evacuated to an acceptable level to make
certain that flammable refrigerant does not remain within the
lubricant.
• The evacuation process shall be carried out prior to returning
the compressor to the suppliers.
• Only electric heating to the compressor body shall be
employed to accelerate this process.
• When oil is drained from a system, it shall be carried out
safely.
• Do not use the unit until it is confirmed 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.

32-EN31-EN – 16 –
EN
(1) Installation conditions for each requirement
• To comply with the requirements of enhanced tightness refrigerating systems of IEC 60335-2-40, the system is
equipped with the shut-off valves (Flow Selector unit, Shut-off valve unit) , Leak detector and Battery kit.
And each systems have the appropriate safety systems in according to the system specifications.
In case the requirements of this manual are followed, no additional safety measures are needed.
• Follow the installation requirements below to ensure that the complete system is compliant to legislation.
If you have any questions, please contact the dealer where you purchased the product.
Depending on the conditions, safety measures (optional parts) may be required.
• System compliance has been completed to IEC60335-2-40 Ed6. If EN378 compliance is required please refer
separately to EN378 for guidance.
1) Outdoor unit installation
Please observe the following warning and install according to “4. Installation of R32 refrigerant air conditioner”.
WARNING
Basically the outdoor unit has to be installed in outdoor area.
The outdoor unit has to be installed at least one side of 4 sides surrounding the unit open.
When installing indoors such as in a machine room, it shall be installed in accordance with IEC60335-2-40.
For other installation conditions, please contact the dealer where you purchased the product.
1580
or more
500+h1/2
or more
300+h2/2
or more
h2
1500 or less
In case
of 1500 mm
or more
In case
of 500 mm
or more
500 or less
h1
300+h2/2
or more
Front
side
When the obstacle exceeds the specified
value
Back
side
Front side (For work and service)
500+h1/2
or more
10 or more
At least one side
2) Indoor unit installation
For the installation of the indoor unit, refer to the installation manual attached to the indoor unit.
For the indoor unit installation of R32 air conditioning system, check the following before installing.
WARNING
• Appliance shall be installed, operated and stored in a room with a floor area larger than [Amin] m2.
• For appliances using R32 refrigerant connected via an air duct system to one or more rooms, the supply and
return air shall be directly ducted to the space.
Open areas such as false ceilings shall not be used as a return air duct;
• No auxiliary devices, which may be a potential ignition source, shall be installed in the duct work.
(example: hot surfaces with a temperature exceeding 700°C and electric switching device)
• There shall be no operating ignition sources (example: open flames, an operating gas appliance or an operating
electric heater) in case the floor area is less than the minimum floor area A (m²).
For the applicable floor area and minimum floor area [Amin], refer to [ 1 ] to [ 5 ] below.
• Piping shall be installed according to the instructions in “8 Refrigerant piping”.
The length of the connection pipe, types of Flow Selector unit and Shut-off Valve unit etc. are determined by the
indoor floor area.
[ 1 ] [Confirmation of installation space and floor area]
• Make sure that the installation height and floor area of each indoor unit type meet the installation height and floor
area specified by the total system refrigerant amount.
• Please refer to the attached “Installation data” for the numerical values of line A and line B in the graphs below.
(a)
(a)
(a)
(b) (b)
(c) (c)
(d)
(d)
(d)
Total system refrigerant (kg)
Minimum floor area Amin [m2]
Ceiling mounted type (include duct type)
Minimum floor area Amin [m2]
Hot water module
Other floors
The lowest floor of the basement
Minimum floor area Amin [m2]
Wall mount and under ceiling Type
Line B
Line B
Line A
Line A
Line A
Total system refrigerant (kg)
Total system refrigerant (kg)
Other than the lowest basement
floor The lowest floor of the basement LFL threshold
Area (a) No safety measured required. No safety measured required. A large space of LFL/4 or less.
Area (b) Leak detector required. Leak detector and safety shut-off
valve required.
A large space of LFL/4 - LFL/2.
Area (c) Leak detector and safety shut-off
valve required.
Installation not permitted. A narrow space of LFL/2 or more.
Area (d)
Installation not permitted. Installation not permitted. Maximum allowable total
refrigerant amount determined
from LFL.

34-EN33-EN
– 17 –
WARNING
• The total amount of refrigerant in the system must be less than or equal to the maximum allowable total amount
of refrigerant.
The maximum allowable amount of refrigerant = (The number of connected indoor units) x 15.96 [kg] and the
maximum is 63.85 [kg].
• Keep the installation height according to the indoor unit type.
Ceiling-mounted unit (include Duct type.) : 2.2 m or more.
For Duct type, both inlet and outlet shall be placed at least 2.2 m.
Inlet and outlet shall not be located above the unit.
Wall-mounted and under ceiling unit : 1.8 m or more.
But install the indoor unit at least 2.5 m above the floor level since otherwise the users may injure themselves or
receive electric shocks if they poke their fingers or other objects into the indoor unit while the air conditioner is
running.
NOTE
• The maximum total amount of refrigerant allowed depends on the area of the room the system serves and the
room on the lowest floor of the basement.
• Please confirm that the condition for total system refrigerant amount is satisfied for [ 5 ] [To determine the limit
on the amount of additional refrigerant].
If the installation becomes impossible in the condition of [1], redesign the system again.
[ 2 ] [Safety measures]
This unit is equipped with a refrigerant leak detector and safety Shut-off Valves for safety.
For each indoor unit, the number of safety devices varies depending on the installation floor, total system
refrigerant amount, indoor unit installation height, and LFL value.
It’s not necessary to install the safety devices when the air conditioning system is installed in a large space of
LFL/4 or less.(each indoor room, outdoor area)
LD : Leak Detector
SV : Shut-off Valve
FS : Flow Selector
Area Safety system Safety measures Safety system operation subsequent status
(a) No safety
measures
0 pc. - No safety system operation. Not applicable
(a)(b) Leak Detector
only.
1 pc. LD When a leak is detected, operation
stops.
Operation cannot be
continued.
(a)(b)
(c)
Pump-down
operation.
2 pcs. LD, FS unit or
SV unit
When a leak is detected, a system
does Refrigerant recovery to
Outdoor unit side by pump-down
operation and closes all safety
shut-off valves. After that, all
systems stop.
Operation cannot be
continued.
(Refrigerant system
will be locked.)
(a)(b)
(c)
Individual
shut-off
operation.
2 pcs. LD, FS unit (single port)
or SV unit
When a leak is detected, safety
Shut-off Valves close only for the
indoor units which refrigerant is
leaked. After that, all systems stop.
Operation cannot
be continued only
for the indoor units
which refrigerant
is detected. Other
indoor units can
continue to operate.
WARNING
• For the refrigerant leak detector to function, the unit shall be powered on at all times after installation, except
during service.
• If LFL area is (c), install Battery kit in each applicable Flow Selector unit and Shut-off Valve unit.
They can shut-off the refrigerant by Battery kits even in the event of a power failure.
(Make sure there are no leaks before use as charging may not be in time during a continuous system power off.)
NOTE
• If there are multiple indoor units with different safety systems in refrigerant system, safety system behaviors may
be different in each indoor unit
(Installation patterns for each safety measure)
The table below shows installation example of safety measures for each safety system.
Position where Leak Detector and Flow Selector unit, Shut-off Valve unit can be installed is determined by room
area, combination, indoor unit type and capacity, etc.
For details, refer to [ 3 ] [Leak Detector installation] and [ 4 ] [Safety shut-off valve installation].
[Each safety system and installation example]
FS : Flow Selector
CODE
No.
[107]
Installation example Case
[00]
FS-M
Area (a)
a
e
bbb
When installing in a room corresponding to
area (a), set the CODE No. [107] to [00].
No additional safety measures are required.
[01]
FS-M
Area (c) Area (c) Area (c)
a
ef
b
ccc
bb
When installing in a room corresponding to
area (c), set the CODE No. [107] to [01] or [02].
Be sure to install a refrigerant leak detector.
Be sure to connect the FS unit (or Shut-off
Valve unit) and install the battery unit.
When the CODE No. [107] is set to [01], the
entire system will be stopped when refrigerant
leakage is detected.
پIn the [01] setting and [02] setting of the
CODE No. [107], the position where the FS
unit (or Shut-off Valve unit) can be installed is
different.

36-EN35-EN – 18 –
EN
[ 3 ] [Leak Detector installation]
See Installation Manual included in Leak Detector for information on installing Leak Detector.
The leak detector implements have safety measures to light up in red and to sound a buzzer, that will warn in case
of a refrigerant leak.
For the Leak Detector installation to R32 air conditioning system, check the following before installing.
WARNING
• The Leak Detector detector used as a safety device for the air conditioning system shall be used the specified
Toshiba optional product.
• Leak Detector installation shall be complied with the following requirements.
1, Leak Detector shall be installed in each room that requires a safety measure.
2, The installation position shall be determined by the type and height of the indoor unit and the presence or
the absence of obstacles between the indoor unit and the leak detector.
• Leak Detector shall be installed outside the indoor unit within a height of 300 mm from the floor.
• Leak Detector shall be located within 10 m horizontal distance in line sight of the unit and on a wall within the
room in which the unit is installed, or 7 m, if not in line sight of the unit, and on a wall within the room in which
the unit is installed. The distance from the unit to Leak Detector shall be measured as the shortest horizontal
unobstructed path between the unit and the nearest Leak Detector.
• The alarm shall always be 15 dB(A) louder than the room background noise.
Leak detector can generate a 65 dB(A) alarm. (Sound pressure level, measured at a distance of 1 m from the
alarm.)
If the surrounding environment is noisy in a particular room, we recommend that you use an external alarm
(by local power supply) in that room.
This leak detector has output terminals to external ventilation and an external alarm.
When taking safety measures using external ventilation or an external alarm, install according to the installation
manual for the leak detector.
[Installation positions of Leak Detectors]
Indoor unit
Indoor unit
h0 ]2.2
h0 ]1.8
Leak Detector
[10 mپ
[300 mm [300 mm
پIt must be placed within a horizontal distance of 10 meters and on the wall in the room where the indoor unit is
installed.
However, when it does not enter the field of view on a straight line from the Leak Detector, it is within 7 m at the
shortest horizontal distance without obstacles and installed on the wall in the room where the indoor unit is installed.
NOTE
The leak detector generates visual and auditory warnings.
FS : Flow Selector
CODE
No.
[107]
Connection example Case
[02] Area (c) Area (c)
FS-S FS-S
affdd
bb
cc
When installing in a room corresponding to
area (c), set the CODE No. [107] to [01] or [02].
Be sure to install a refrigerant leak detector.
Be sure to connect the FS unit (or Shut-off
Valve unit) and install the battery unit.
When the CODE No. [107] is set to [02],
the corresponding indoor unit stops when
refrigerant leakage is detected (other indoor
units can continue operation).
پIndoor units connected to the multi port
type FS unit cannot be set to [02] for indoor
DN[107].
پIn the [01] setting and [02] setting of the
CODE No. [107], the position where the
FS unit (or Shut-off Valve unit) can be installed
is different.
[03]
Area (b) Area (b)
FS-S FS-S
bb
dd
a
cc
When the CODE No. [107] is set to [03]
by area (b), the entire system stops when
refrigerant leakage is detected.
This setting can only be used in rooms that fall
under area (b).
Be sure to install a refrigerant leak detector.
a : Outdoor unit
b : Indoor unit
c : Leak detector
d : Single port type Flow Selector unit (or Shut-off Valve unit)
e : Multi port type Flow Selector unit
f : Battery unit

38-EN37-EN
– 19 –
(The examples for safety device installations)
The location of the leak detector varies depending on the safety system and the room.
Incorrect Correct Case
1
FS-S FS-S
aff
b
cc
b
dd FS-S FS-S
aff
cc
dd
Install the Leak
Detector in the
same room as the
connected indoor
unit.
2
FS-S FS-S
aff
b
cc
b
dd
Group setting of
indoor unit across
FS unit (or Shut-off
Valve unit) is not
possible.
3
FS-S
af
cc
bb
d
FS-S
af
c
bb
d
Only one Leak
Detector can be
connected to indoor
units with a group
setting.
4
FS-S FS-S
aff
c
c
bb
dd FS-S FS-S
af
c
bb
dd
Multiple refrigerant
Leak Detectors
cannot be
connected to one
indoor unit.
5
FS-M
a
e
f
ccc
bbb
FS-M
e
a
f
ccc
bbb
Only one Leak
Detector can be
connected to indoor
units with a group
setting.
Install each indoor
unit in a separate
room, and do not
set the group if a
Leak Detector is
required.
پMulti port type
FS unit cannot be
used by setting the
CODE No. [107]
to [02] (Individual
shut-off).
Incorrect Correct Case
6
FS-M
a
e
f
ccc
bbb
FS-M
a
e
f
cc
bbb
Only one Leak
Detector can be
connected to indoor
units with a group
setting.
If indoor units
installed in the
same room are
used in the group
setting, the Leak
Detector to be
connected should
be one in one
group.
پMulti port type
FS unit cannot be
used by setting the
CODE No. [107]
to [02] (Individual
shut-off).
7
FS-M
a
e
f
c
bbb
FS-M
a
e
f
c
bbb
Install the Leak
Detector in the
same room as the
connected indoor
unit.
پMulti port type
FS unit cannot be
used by setting the
CODE No. [107]
to [02] (Individual
shut-off).
a : Outdoor unit
b : Indoor unit
c : Leak detector
d : Single port type Flow Selector unit (or Shut-off Valve unit)
e : Multi port type Flow Selector unit
f : Battery unit
FS : Flow Selector
[ 4 ] [Safety shut-off valve installation]
Flow Selector unit and Shut-off Valve unit can be used as safety shut-off valve.
In Pump-down operation and Individual shut-off operation, the position where the safety shut-off valve can be
installed differs depending on the indoor unit, safety shut-off valve type, etc.
The installation position shall be determined according to the following.
Pump-down operation
For Pump-down operation, following 3 types of safety shut-off valves can be installed;
FS : Flow Selector
SV : Shut-off Valve
NO. Type System
1 FS unit (Multi port) Heat recovery
2 FS unit (Sigle port) Heat recovery
3 SV unit Cooling only setting of heat recovery, Heat pump
• Flow Selector (FS) unit
The installation availability line differs depending on the FS unit type (multi / single, horsepower, number of
ports) and the length of the connecting pipe.
Example) Multi port types of 8 and 12 ports Shutoff valve secondary side (Max. pipe connection length 180 m)