Toshiba RAS-3M18U2AVG-E, RAS-2M10U2AVG-E, RAS-2M14U2AVG-E, RAS-2M18U2AVG-E User Manual

AIR CONDITIONER (MULTI-SPLIT TYPE)

Installation Manual

Outdoor Unit

Model name:

RAS-2M10U2AVG-E
RAS-2M14U2AVG-E
RAS-2M18U2AVG-E
RAS-3M18U2AVG-E

R32

* NOTE:
Descriptions about operations for the 3 indoor units in

this manual are not applicable to RAS-2M10U2AVG-E,
RAS-2M14U2AVG-E and RAS-2M18U2AVG-E.

Installation Manual
Outdoor Unit

English

Outdoor Unit Installation Manual

Contents

1 Precautions for safety ........................................................................................... 2

2 Installation / service tools ....................................................................................... 9

3 Specifications ................................................................................................... 9

4 Installation parts, accessories ................................................................................... 9

5 Installation of outdoor unit ..................................................................................... 10

6 Refrigerant piping .............................................................................................. 11

7 Electrical work ................................................................................................. 12

8 Grounding ..................................................................................................... 13

9 Test run ........................................................................................................13

10 Pump-down Operation ......................................................................................... 15

11 Troubleshooting ...............................................................................................15

12 Appendix ...................................................................................................... 16

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, refer to the Installation Manual attached to the indoor unit.

IMPORTANT NOTICE

For details on how to install the indoor units, refer to the installation manual accompanying the indoor units.

1

Outdoor Unit Installation Manual

Precautions for safety

1

The manufacturer shall not assume any liability for the damage caused by not observing the
description of this manual.
Be sure to read this installation manual carefully before installing.
The supplied CD-ROM contains the installation manual translated into many languages.
Recommend to the owner to perform maintenance periodically when using over long periods
of time.
This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or instruction concerning use of the appliance in a safe way and
understand the hazards involved.

Children shall not play with the appliance. Cleaning and user maintenance shall not be made
by children without supervision.



Warning indications on the air conditioner unit

This mark is for R32 refrigerant only. Refrigerant type is written
on nameplate of outdoor unit.

WARNING

(Risk of fi re)

In case that refrigerant type is R32, this unit uses a fl ammable
refrigerant.
If refrigerant leaks and comes in contact with fi re or heating part,
it will create harmful gas and there is risk of fi re.

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.

Be sure to follow the precautions provided here to avoid safety risks. The symbols and their
meanings are shown below.

DANGER

WARNING

It indicates that incorrect use of this unit can result in a high possibility of
severe injury(*1) or death.

It indicates that incorrect use of this unit may cause severe injury or
death.

CAUTION

It indicates that incorrect use of this unit may cause personal injury(*2),
or property damage(*3).

*1: A severe injury refers to blindness, injury, burns (hot or cold), electrical shock, bone

fracture, or poisoning that leaves after effects and requires hospitalization or extended
out-patient treatment.

*2: Personal injury means a slight accident, burn, or electrical shock which does not

require admission or repeated hospital treatment.

*3: Property damage means greater damage which affects assets or resources.

2

Outdoor Unit Installation Manual

For general public use

Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene
sheathed fl exible cord (design H07RN-F) or cord designation 60245 IEC66 (1.5 mm² or
more). (Shall be installed in accordance with national wiring regulations.)
This appliance is not intended for use by person (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
Children should be supervised to ensure that they do not play with the appliance.

CAUTION

To disconnect the appliance from the main power supply

This appliance must be connected to the main power supply by means of a circuit breaker or
a switch with a contact separation of at least 3 mm in all poles.

CAUTION

NEW REFRIGERANT AIR CONDITIONER INSTALLATION

THIS AIR CONDITIONER USES THE NEW HFC REFRIGERANT (R32), WHICH DOES
NOT DESTROY THE OZONE LAYER.
R32 REFRIGERANT IS APT TO BE AFFECTED BY IMPURITIES SUCH AS WATER,
OXIDIZING MEMBRANES, AND OILS BECAUSE THE PRESSURE OF R32
REFRIGERANT IS APPROX. 1.6 TIMES OF REFRIGERANT R22.
AS WELL AS THE ADOPTION OF THIS NEW REFRIGERANT, REFRIGERATING
MACHINE OIL HAS ALSO BEEN CHANGED. THEREFORE, DURING INSTALLATION
WORK, BE SURE THAT WATER, DUST, FORMER REFRIGERANT, OR REFRIGERATING
MACHINE OIL DOES NOT ENTER THE REFRIGERATION CYCLE OF A NEW­REFRIGERANT AIR CONDITIONER. TO AVOID MIXING REFRIGERANT AND
REFRIGERATING MACHINE OIL, THE SIZES OF CHARGING PORT CONNECTING
SECTIONS ON THE MAIN UNIT ARE DIFFERENT FROM THOSE FOR THE
CONVENTIONAL REFRIGERANT, AND DIFFERENT SIZE TOOLS ARE ALSO REQUIRED.
FOR CONNECTING PIPES, USE NEW AND CLEAN PIPING MATERIALS WITH HIGH
PRESSURE WITHSTAND CAPABILITIES, DESIGNED FOR R32 ONLY, AND ENSURE
THAT WATER OR DUST DOES NOT ENTER. MOREOVER, DO NOT USE ANY EXISTING
PIPING AS ITS PRESSURE WITHSTAND MAY BE INSUFFICIENT AND MAY CONTAIN
IMPURITIES.

3

Outdoor Unit Installation Manual

DANGER

• THE MANUFACTURER SHALL NOT ASSUME ANY LIABILITY FOR THE DAMAGE
CAUSED BY NOT OBSERVING THE DESCRIPTION OF THIS MANUAL.

• FOR USE BY QUALIFIED PERSONS ONLY.

• MEANS FOR DISCONNECTION FROM THE SUPPLY HAVING A CONTACT
SEPARATION OF AT LEAST 3 MM IN ALL POLES MUST BE INCORPORATED IN THE
FIXED WIRING.

• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK.
MAKE SURE ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE
ELECTRIC SHOCK.

• CONNECT THE CONNECTING CABLES CORRECTLY. IF THE CONNECTING CABLES
ARE CONNECTED WRONGLY, ELECTRIC PARTS MAY BE DAMAGED.

• CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE
INSTALLATION.

• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS
VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR
EXPLOSION.

• TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD,
PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS
RADIATORS, HEATERS, FURNACE, STOVES, ETC.

• WHEN MOVING THE AIR CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE
AGAIN, BE VERY CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R32)
WITH ANY OTHER GASEOUS BODY INTO THE REFRIGERATION CYCLE. IF AIR OR
ANY OTHER GAS IS MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE
REFRIGERATION CYCLE BECOMES ABNORMALLY HIGH AND IT RESULTANTLY
CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.

• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING
THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF
THE REFRIGERANT GAS IS HEATED BY FIRE OR SOMETHING ELSE, IT CAUSES
GENERATION OF POISONOUS GAS.

• WHEN INSTALLING OR RE-INSTALLING THE AIR CONDITIONER, DO NOT INJECT
AIR OR OTHER SUBSTANCES BESIDES THE DESIGNATED REFRIGERANT “R32”
INTO THE REFRIGERATING CYCLE.
IF AIR OR OTHER SUBSTANCES ARE MIXED, AN ABNORMAL PRESSURE CAN
OCCUR IN THE REFRIGERATING CYCLE, AND THIS CAN CAUSE AN INJURY DUE
TO A PIPE RUPTURE.

4

Outdoor Unit Installation Manual

WARNING

About the refrigerant

• This product contains fl uorinated 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 fl ames, 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 fl ammable. If the refrigerant leaks in the room and comes
in contact with fi re from a burner, a heater, or a cooker, it may result in fi re 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 confi rms that the portion from which the
refrigerant leaked is repaired.

• When installing, relocating, or servicing the air conditioner, use only the specifi ed
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.

5

Outdoor Unit Installation Manual

WARNING

• Do not use any refrigerant different from the one specifi ed 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.

• Installation work must be requested from the supplying retail dealership or professional
vendors. Self-installation may cause water leakage, electrical shock, or fi re as a result of
improper installation.

• Specifi ed tools and pipe parts for model R32 are required, and installation work must
be done in accordance with the manual. HFC type refrigerant R32 has 1.6 Times more
pressure than that of conventional refrigerant (R22). Use the specifi ed pipe parts, and
ensure correct installation, otherwise damage and/or injury may be caused. At the same
time, water leakage, electrical shock, and fi re may occur.

• Be sure to install the unit in a place which can suffi ciently bear its weight. If the load
bearing of the unit is not enough, or installation of the unit is improper, the unit may fall
and result in injury.

• Electrical work must be performed by a qualifi ed electrical engineer in accordance with
the code governing such installation work, internal wiring regulations, and the manual.
A dedicated circuit and the rated voltage must be used. Insuffi cient power supply or
improper installation may cause electrical shock or fi re.

• Use a cabtyre cable to connect wires in the indoor/outdoor units. Midway connection,
stranded wire, and single-wire connections are not allowed. Improper connection or fi xing
may cause a fi re.

• Wiring between the indoor unit and outdoor units must be well shaped so that the cover
can be fi rmly placed. Improper cover installation may cause increased heat, fi re, or
electrical shock at the terminal area.

• Be sure to use only approved accessories or the specifi ed parts. Failure to do so may
cause the unit to fall, water leakage, fi re or electrical shock.

• After the installation work, ensure that there is no leakage of refrigerant gas. If the
refrigerant gas leaks out of the pipe into the room and is heated by fi re or something else
from a fan heater, stove or gas range, it causes generation of poisonous gas.

• Make sure the equipment is properly earthed. Do not connect the earth wire to a gas pipe,
water pipe, lightning conductor, or telephone earth wire. Improper earth work may be the
cause of electrical shock.

• Do not install the unit where fl ammable gas may leak. If there is any gas leakage or
accumulation around the unit, it can cause a fi re.

• Do not select a location for installation where there may be excessive water or humidity,
such as a bathroom. Deterioration of insulation may cause electrical shock or fi re.

6

Outdoor Unit Installation Manual

WARNING

• Installation work must be performed following the instructions in this installation manual.
Improper installation may cause water leakage, electrical shock or fi re. Check the
following items before operating the unit.

- Be sure that the pipe connection is well placed and there are no leaks.

- Check that the service valve is open. If the service valve is closed, it may cause

overpressure and result in compressor damage. At the same time, if there is a leak in
the connection part, it may cause air suction and overpressure, resulting in burst or
injury.

• The installation of pipe work shall be kept to a minimum.

• The following must be certainly done during pump down.

• Do not incorporate air into the refrigeration cycle.

• Close the 2 service valves. Stop the compressor and remove the refrigerant pipe.
If the refrigerant pipe is removed when the compressor is operating and service valves are
opened, the refrigerant cycle will inhale unwanted matter such as air and the pressure in
the cycle becomes abnormally elevated. It may cause a burst or injury.

• Do not modify the power cable, connect the cable midway, or use a multiple outlet
extension cable. Doing so may cause contact failure, insulation failure, or excess current,
resulting in fi re or electrical shock.

• If you detect any damage, do not install the unit. Contact your supplying dealer
immediately.

• Never modify this unit by removing any of the safety guards or bypassing any of the safety
interlock switches.

• Do not wash air conditioners with pressure washers.
Electric leaks may cause electric shocks or fi res.

• Be sure to comply with local regulations/codes when running the wire from the outdoor
unit to the indoor unit. (Size of wire and wiring method etc.)

• When installing the air conditioner in a small room, provide appropriate measures to
ensure that the concentration of refrigerant leakage occur in the room does not exceed
the critical level. It is not dangerous refrigerant; it has not toxicity or combustibility.
However, a concentration above 0.3 kg/m³ as criterion still causes suffocation. The volume
of refrigerant charged to the multi system air conditioner is more than the volume charged
to a conventional individual system.

• 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 fi rst conducting these checks.

• Make sure drain hose insulation if cooling operation is used at sub-zero ambient
temperature.

7

Outdoor Unit Installation Manual

CAUTION

• Please read this installation manual carefully before installing the unit. It contains further
important instructions for proper installation.

• Exposure of unit to water or other moisture before installation could result in electric
shock. Do not store it in a wet basement or expose to rain or water.

• After unpacking the unit, examine it carefully for possible damage.

• Do not install in a place that can increase the vibration of the unit. Do not install in a place
that can amplify the noise level of the unit or where noise and discharged air might disturb
neighbours.

• This appliance must be connected to the main power supply by means of a circuit breaker
depending on the place where the unit is installed. Failure to do so may cause electrical
shock.

• Follow the instructions in this installation manual to arrange the drain pipe for proper
drainage from the unit. Ensure that drained water is discharged. Improper drainage can
result in water leakage, causing water damage to furniture.

• Tighten the fl are nut with a torque wrench using the prescribed method. Do not apply
excess torque. Otherwise, the nut may crack after a long period of usage and it may
cause the leakage of refrigerant.

• Wear gloves (heavy gloves such as cotton gloves) for installation work. Failure to do so
may cause personal injury when handling parts with sharp edges.

• Do not touch the air intake section or the aluminium fi ns of the outdoor unit. It may cause
injury.

• Do not install the outdoor unit in a place which can be a nest for small animals. Small
animals could enter and contact internal electrical parts, causing a failure or fi re.

• Request the user to keep the place around the unit tidy and clean.

• Make sure to conduct a test run after the installation work, and explain how to use and
maintain the unit to the customer in accordance with the manual. Ask the customer to
keep the operation manual along with the installation manual.

• 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.

Requirement of report to the local power supplier

Please make absolutely sure that the installation of this appliance is reported to the local
power supplier before installation. If you experience any problems or if the installation is not
accepted by the supplier, the service agency will take adequate countermeasures.

 Important information regarding the refrigerant used
This product contains fl uorinated greenhouse gases.
Do not vent gases into the atmosphere.
Refrigerant type: R32
GWP

The refrigerant quantity is indicated on the unit name plate.
* This value is based on F gas regulation 517/2014

(1)

value: 675 * (ex. R32 ref. AR4)

(1)

GWP = global warming potential

8

Outdoor Unit Installation Manual

Installation / service tools

2

Changes in the product and components

In air conditioners using R32, in order to prevent any other refrigerant from being accidentally charged, the service port diameter size of the outdoor unit service
valve has been changed. (1/2 UNF 20 threads per inch)

• In order to increase the pressure resisting strength of the refrigerant piping, fl are processing diameter and opposing fl are nuts sizes have been changed. (for
copper pipes with nominal dimensions 1/2 and 5/8)

Gauge manifold for R32
Charge hose for R32
Vacuum pump for R32
Gas leakage detector for R32

Specifi cations

3

Cooling operation –10 to 46 °C

Operating conditions

Connecting pipe length

The specifi cations for performance of this air conditioner differs depending on the combination of the indoor units which are operated.

*1 If the air conditioner is used in conditions other than the above, the safety protection functions may be activated.

* Example of indoor unit class: RAS-B10UFV-E1 is abbreviated as “10”.

Indoor unit class

Unit C 07 or 10 or 13 — — — 6.35, 9.52 mm
Unit B 07 or 10 or 13 or 16 6.35, 9.52 mm 6.35, 9.52 mm 6.35, 9.52 mm

Unit A 07 or 10 or 13 or 16 6.35, 9.52 mm 6.35, 9.52 mm 6.35, 9.52 mm

20 (RAS-2M10U2AVG-E)
26 (RAS-2M14U2AVG-E)

Total

32 (RAS-2M18U2AVG-E)
36 (RAS-3M18U2AVG-E)

All combinations that do not exceed the “Total” number can be installed.
2 or more indoor units must be connected to an outdoor unit.
When 2 indoor units are connected to an outdoor unit, note that some combinations of indoor units are not compatible.
For the further details, refer to the catalogue.
*2 Need the reducer (07, 10, 13 class 12.7 to 9.52 mm).
*3 Need the expander (16 class 9.52 to 12.7 mm).

• Locally procured.

*1

Dry operation –10 to 46 °C
Heating operation –20 to 24 °C
Minimum for 1 unit (m) 2222
Maximum for 1 unit (m) 15 20 20 25
Maximum for total unit (m) 20 30 30 50
Height difference (m) 10 10 10 10
No additional refrigerant charge (m) 20 30 30 50

Phillips screwdriver
Level
Scale
Utility knife

RAS-2M10U2AVG-E RAS-2M14U2AVG-E RAS-2M18U2AVG-E RAS-3M18U2AVG-E

RAS-2M10U2AVG-E RAS-2M14U2AVG-E RAS-2M18U2AVG-E RAS-3M18U2AVG-E

Pipe cutter
Torque wrench
Wrench (or spanner)
Reamer

Standard connecting pipe diameter

—

Flare tool for R32
4 mm hexagonal wrench

*3

*3

6.35, 9.52 mm

6.35, 12.7 mm

*3

*2

Installation parts, accessories

4

Installation parts *Locally procured

Parts name Specifi cations Q’ty

Indoor unit

(abbreviation)

Refrigerant piping

Putty, PVC tapes — 1 ea.

*4

07, 10, 13 6.35 mm 9.52 mm

16 6.35 mm 12.7 mm

Liquid side

(O.D.)

Gas side (O.D.)

1 ea.

Accessories

Installation
manual

Product
specifi cation

1

1

Rubber cap
(Water-proof)

2

CD-ROM
(Installation
manual)

9

*4 Refrigerant piping covered with insulating material (Polyethylene

foam, 6 mm thick) When duct-type or cassette-type unit is to
be installed, it shall be covered with thicker insulating material
(Polyethylene foam, 10 mm thick)

1

F-GAS label 1 Drain nipple 1

Outdoor Unit Installation Manual

Installation of outdoor unit

5

Installation Location



• A place which can bear the weight of the outdoor unit and does not cause
an increase in noise level and vibration.

• A place where the operation noise and air discharge do not disturb
neighbours.

• A place which is not exposed to strong wind.

• A place free of combustible gas.

• A place which does not block a passageway.

• A place where the drain water does not cause any problems.

• A place where there are no obstructions near its air intake or air discharge.

Installation in the following places may result in trouble:

• A place with a lot of machine oil.

• A place with saline-rich atmosphere such as a coastal area.

• A place with high level of sulfi de gas.

• A place where high-frequency waves are likely to be generated, such as
from audio equipment, welders, or medical equipment.

Do not install the unit in such places.

CAUTION

When the outdoor unit is installed in a
place where the drain water might cause
any problems, Seal the water leakage
point tightly using a silicone adhesive or
caulking compound.

Precautions for Installation



• When the outdoor unit is to be installed in an elevated position, be sure to
secure its feet.

• If the outdoor unit is to be mounted on a wall, make sure the base plate
supporting it is sturdy enough.

• The base plate should be designed and manufactured to maintain its
strength over a long period of time, and suffi cient consideration should be
given to ensure that the outdoor unit will not fall.

• When the outdoor unit is installed in a place that is always exposed to
strong wind such as a coastal area or on a high story of a building, secure
the normal fan operation using a duct or a wind shield.

• Especially in windy areas, install the unit in such a way as to prevent the
admission of wind.

• When the outdoor unit is to be mounted high on a wall, take particular care
to ensure that parts do not fall, and that the installer is protected.

• When doing installation work at ground level, it is usual to make wiring and
pipe connections to the indoor units fi rst, and then to make connections to
the outdoor units.

However, if outdoor work is diffi cult, you can change the procedure.
For example, by making adjustments to the wiring and piping lengths on

the inside (rather than the outside).

• When 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.

Necessary Space for Installation

If you need to install the outdoor unit in a location where there are some
obstructions or a wall, secure suffi cient space as shown in the fi gure below.
The cooling/heating effect may be reduced by 10%.

Draining Off the Water from the Outdoor Unit

Install 2 waterproof rubber caps and the drain nipple to drain off the
water from the outdoor unit.

• Seal the knock-out holes and screw/thread areas tightly using a silicon
adhesive or a caulking compound.

• Use a drain pan to apply a centralized drain.

Water-proofi ng rubber cap

Drain nipple

Installation in Regions with Snowfall and Cold Temperatures

Do not use waterproof rubber caps or a drain nipple.

• If you need to install the outdoor unit in a location where there is a
possibility of the drain freezing, pay close attention so that the drain does
not become frozen.

• To protect the outdoor unit from snow, install the outdoor unit on a holding
frame, and attach a snow protection hood and plate.

• Keep the outdoor unit at least 500 mm above the snow accumulation line.

Snow protection plate

Front

Anchor bolts

Snow protection hood

At least 500 mm

Snow accumulation line

Holding frame

Fixing the Outdoor Unit

Fix the outdoor unit using attachment bolts.

• Use 8 mm or 10 mm anchor bolts and nuts.

• Do not allow the attachment bolts to protrude by more than 15 mm.

• Install the outdoor unit at ground level.

• Attach the vibration-proof rubber pads under the fi xing legs.

Drain nipple mounting hole

508

600 99100

54

15 mm or

351

330

Mounting
leg

Drain hole

GOOD BAD

Absorb vibration
with vibration-proof
rubber pads

If only the end of
the mounting leg
is supported, it
may deform.

less

Do not support
the outdoor unit
only with the
mounting leg.

100 mm or more

600 mm or more

600 mm or more

100 mm or more

600 mm or more

Foundation

Bottom plate of
outdoor unit

Foundation

Support the bottom surface of the mounting
leg that is in contact with and underneath the
bottom plate of the outdoor unit.

10

Foundation

Outdoor Unit Installation Manual

Refrigerant piping

6

CAUTION

Install in rooms that are 5 m

3

or larger. If
a leak of refrigerant gas occurs inside the
room, an oxygen defi ciency may occur.

Detaching the Valve cover



Remove the 5 screws.

• Pull the valve cover in the direction of the arrow, and remove it.

Valve cover

Refrigerant Piping Connection



Flaring

1. Cut the pipe with a pipe cutter.

90° Obliquity Roughness Warp

2. Remove the burr inside of the pipe.
When removing the burr, be careful so that chips do not fall into the pipe.

3. Remove the fl are nuts attached to the outdoor/indoor unit, then insert them
into each of the pipes.

4. Flare the pipes.

See the following table for the projection margin (A) and fl aring size (B)

Width

across

fl at

B

Tighten torque

14 to 181.4 to

1.8

33 to 423.3 to

4.2

50 to 625.0 to

6.2

A

Die

Pipe A B Flare Nut

Outside

diameter

Thickness

mm mm mm mm mm mm N•m kgf•m

6.35 0.8 0 to 0.5

9.52 0.8 0 to 0.5

12.7 0.8 0 to 0.5

Pipe

Rigid

(clutch

type)

R32 tool

Imperial

(wing

nut type)

R32 tool

1.5 to

2.0

1.5 to

2.0

2.0 to

2.5

9.1 17

13.2 22

16.6 26

CAUTION

• Do not scratch the inner surface of the
fl ared part when removing burrs.

• Flare processing under the condition of
scratches on the inner surface of fl are
processing part will cause refrigerant gas
leak.

Pipe connection

1. Make wire and pipe connections for each indoor unit separately.

2. Align the centres of the connecting pipes and tighten the fl are nut as much
as possible with your fi ngers, then tighten the nut using a torque wrench.

Be sure to tighten the nut at the specifi ed torque value.

• If you use one outdoor unit for several indoor units of a different class,

connect the largest one fi rst A, then connect the rest in the order B to C.

• Do not remove the fl are nuts for any ports you are not going to use for

connection.

• Do not leave the fl are nut unattached for a long period of time.

• Use a different-diameter joint if the diameters of the connection port and

connection piping are different.

• Mount the different-diameter joint on the connection port of the outdoor

unit.

CAUTION

• KEEP IMPORTANT 6 POINTS FOR
PIPING WORK.

(1) Take away dust and moisture (inside

of the connecting pipes).

(2) Tighten the connections (between

pipes and unit).

(3) Evacuate the air in the connecting

pipes using a VACUUM PUMP.
(4) Check gas leak (connected points).
(5) Be sure to fully open the packed

valves before operation.
(6) Reusable mechanical connectors

and fl ared joints are not allowed

indoors. When mechanical

connectors are reused indoors,

sealing parts shall be renewed.

When fl ared joints are reused

indoors, the fl are part shall be

refabricated.

Air Purge



From the sake of environmental protection, use a vacuum pump to extract the
air during installation.
* Prepare a 4 mm hexagon wrench.

1. Connect a charge hose.

• Make sure that the Handle Hi of the gauge manifold valve is closed fully.

• Connect the port of the gauge manifold valve and the service port
(Valve core (Setting Pin)) using the charge hose.

NOTE

If a control valve or charge valve is attached to the charge hose, leak
of R32 refrigerant can be avoided.

2. Open the Handle Low of the gauge manifold valve fully, then operate the
vacuum pump.

• Loosen the fl are nut of the at the gas end a little to make sure that air is

taken in, then tighten the nut.

• If you fi nd air is not taken in, make sure that the charge hose is

connected to the port(s) securely.

• Perform extraction for about 15 or more minutes and make sure that the

compound pressure gauge reading is –101 kPa (–76 cmHg).

• If the compound pressure gauge reading is not –101 kPa (–76 cmHg),

there is a possibility air is being taken in from the port(s).

• Make sure that the charge hose is connected to the port(s) securely.

3. Close the Handle Low of the gauge manifold valve fully, then stop
operating the vacuum pump.

• Leave the gauge and pump as they are for 1 or 2 minutes, then make

sure that the compound pressure gauge reading stays at –101 kPa (–76
cmHg).

• You need not add refrigerant.

11

Outdoor Unit Installation Manual

4. Disconnect the charge hose from the service port, then open the valve
stem fully using a 4 mm hexagon wrench.

Hexagon wrench is
required.

5. Tighten the service valve stem cap and service port cap securely.

Service port cap

4 mm

Valve stem cap

CAUTION

Use a torque wrench and tighten the nut at
the specifi ed torque value.

6. Tighten all the caps on the valves securely, then perform a gas leak
inspection.

Service valve

Type mm N•m kgf•m N•m kgf•m

Liquid side 6.35 14 to 18 1.4 to 1.8 — —

Gas side

pressure gauge

–101 kPa (–76 cmHg)

9.52 14 to 18 1.4 to 1.8 14 to 18 1.4 to 1.8

12.7 33 to 42 3.3 to 4.2 14 to 18 1.4 to 1.8

Compound

Handle Low

Charge hose

Valve stem cap Service port cap

Tighten torque

Pressure gauge

Handle Hi
(Keep full closed)

Manifold valve

Charge hose

Performing Additional Installation of an Indoor Unit



1. Collect refrigerant from the outdoor unit.

2. Turn off the circuit breaker.

3. Perform additional installation referring to the procedure from “Refrigerant
Piping Connection” on the previous page.

Electrical work

7

WARNING

• Be sure to comply with local regulations/
codes when running the wire from the
outdoor unit to the indoor unit.

(Size of wire and wiring method etc.)

• A lack of electrical capacitance or
incorrect wiring may cause an electric
shock or a fi re.

• To make sure that the wiring connection
are secure, use designated cables.

• Fix the cables securely so that no
external force applied to the cables may
effect the terminals.

• If wiring connections are incomplete
or cables are not fi xed securely, it may
cause a fi re.

• Be sure to ground the outdoor unit.

• Incomplete grounding may lead to an
electric shock.

Service valve at

the liquid side

Service valve at

the gas side

Service port

(Valve core

(Setting pin))

Insulation of the Refrigerant Pipes



• Insulate the refrigerant pipes for liquid and gas separately.

Heat-proof bubble polyethylene

Gas Leak Inspection



• Perform a gas leak inspection for the fl are nut connections, valve stem
connection, and service port cap without fail.

• Use a leak detector exclusively manufactured for R32.

Flare nut connections
(Indoor unit)

Service port cap
connection

Valve stem cap
connection

* Check point example (RAS-3M18U2AVG-E)

Vacuum pump
adapter for
counterfl ow
preventation

Vacuum pump

Flare nut connections
(Outdoor unit)

CAUTION

• Incorrect/incomplete wiring will cause
electrical fi res or smoke.

• Prepare the power source for exclusive
use with the air conditioner.

• This product can be connected to the
main power.

Fixed wire connections:
A switch that disconnects all poles and

has a contact separation of at least
3 mm must be incorporated into the fi xed
wiring.

12

Outdoor Unit Installation Manual

Wire Connection



• The dash lines show on-site wiring.
For indoor unit RAS-M series.

(System

(Main circuit)

Input power

Leakage
breaker

Earth

For indoor unit RAS-B series.

(Main circuit)

Input power

Leakage
breaker

Earth

• Connect the indoor/outdoor connecting cables to the identical terminal
numbers on the terminal block of each unit.

• Incorrect connection may cause a failure.

Model RAS-2M10U2AVG-E

Power supply 1ph, 50Hz, 220-240V
Maximum running

current
Installation fuse

rating

Power cord

Connecting cable

1. Remove the valve cover screws.

2. Pull the valve cover in the direction of arrow, and remove it.

3. Remove the cord clamp and the terminal cover.

L

N

L

N

12.3A 12.6A 13.1A

interconnection wires)

1

2

3

(System
interconnection wires)

2

3

RAS-2M14U2AVG-E
RAS-2M18U2AVG-E

(All types can be used)

H07RN-F or 60245 IEC 66

3-core 1.5 mm²

H07RN-F or 60245 IEC 66

4-core 1.0 mm²

2

3

Indoor unit

2

3

Indoor unit

15A

Remote
controller

Remote
controller

RAS-3M18U2AVG-E

Stripping Length of connecting cable for outdoor unit

3

2

1(L)

5

5

55

30

Earth wire Earth wire

Connecting cable

Connecting cable

Grounding

8

This air conditioner must be grounded without fail.

• Grounding is necessary not only to safeguard against the possibility
of receiving an electric shock but also to absorb both static, which is
generated by high frequencies and held in the surface of the outdoor unit,
and noise since the air conditioner incorporates a frequency conversion
device (called an inverter) in the outdoor unit.

• If the air conditioner is not grounded, users may receive an electric shock
if they touch the surface of the outdoor unit and that unit is charged with
static.

Test run

9

Wiring/Piping Check



Connecting cable

Unit A

Unit B

30

Power cord

N

L

5

Earth screwEarth screw

Power cord

Earth screwEarth screw

Connecting cable
Unit C

5

55

CAUTION

Electric current is applied on the
control board. Beware of electric
shock.

Valve cover

Terminal cover

Cord clamp

4. Connect the wires for the power source and each indoor unit.

• Connect the connecting cable to the terminal as identifi ed by the
matching numbers on the terminal block of the indoor and the outdoor
unit.

5. Fix the wiring connections for the power source and each indoor unit
securely using a cord clamp.

6. Attach the terminal cover and the valve cover.

1. Remove the valve cover screws.

2. Pull the valve cover in the direction of arrow, and remove it.

LED Service switches

D801

D803

D802

D804

D805

D800

13

Valve cover

SW02

SW01

Outdoor Unit Installation Manual

3. Turn on the circuit breaker to supply electricity.

In the initial LED display status, D805 is lighted as below.

 : ON,  : OFF, : Rapid Flashing (5 times/sec.),

D800 D801 D802 D803 D804 D805



¯ : Slow Flashing (1 time/sec.)

Start running all the indoor units connected to the outdoor unit in the
cooling mode.
(The indoor unit in the room that doesn’t operate the cooling mode cannot
be checked.)

4. After 5 minutes, hold down SW01 for at least 5 seconds, and check that
D800 is lighted and D804 light is fl ashing (1 time/sec.).

D800 D801 D802 D803 D804 D805

¯ 

5. Press the SW01 4 times until the LED is displayed as below.

D800 D801 D802 D803 D804 D805





6. Press SW02 for 1 times. Then D805 light is fl ashing (5 times/sec.).

D800 D801 D802 D803 D804 D805



7. Hold down SW02 for at least 5 seconds. Then the wiring/piping check
starts automatically. (The LED display is lighted for a moment.)

D800 D801 D802 D803 D804 D805

¯ 

• If no problems are detected, the checking operation returns to the

normal operation automatically. The LED is displayed as below.

D800 D801 D802 D803 D804 D805



8. The below is displayed when the error is detected.

(* Repetition of 3 sec ON / 0.5 sec OFF)

D800 D801 D802 D803 D804 D805

* * * * *





Press the SW01 3 times until the LED is displayed as below, to check the

room judged as error.

D800 D801 D802 D803 D804 D805



Incorrect wiring/piping can be checked by pressing SW02. The LED is

displayed as below. Turn off the circuit breaker, then check wiring/piping
again.

Check result

D800 D801 D802 D803 D804 D805 Description

¯

¯

¯

¯

¯

¯

¯

¯

• The D800 LED represents unit A.

• The D801 LED represents unit B.

• The D802 LED represents unit C.

Normal operation (no error)
Trouble in unit A
Trouble in unit B
Trouble in unit C
Trouble in unit A and B
Trouble in unit A and C
Trouble in unit B and C
Trouble in unit A, B and C

9. When you want to start over the operation of the SW01 and SW02, press
the SW01 and the SW02 at the same time for 5 sec. (The procedure will
set back to step 3.) However, do not execute the operation during the
check. If by any chance the check is stopped by the operation, start over
the check after turning off the power once.

10. Notes

• It sometimes takes about 30 minutes maximum for the check.

• During the check, the compressor and the fan of the outdoor/indoor unit

repeat ON/OFF.

• You cannot check wiring/piping when the external temperature is 5°C

or less. Also, there is a possibility to misjudge if the indoor temperature
becomes too low by cooling operation. In that case, execute the cooling
operation for per room and check if the connection is normal.

Gas Leak Inspection



Refer to the “ Gas Leak Inspection” on page 12.

Test run



1. If you perform the test run in summer, start running in the cooling mode
fi rst to decrease the temperature of the room, then run in the heating
mode.

(Heating mode: Set the temperature to 30°C.)

• If you perform the test run in winter, start running in the heating mode

fi rst to increase the temperature of the room, then run in the cooling
mode.

(Cooling mode: Set the temperature to 17°C.)

2. For the test run, be sure to satisfy the following conditions below:

- Perform the test run for each indoor unit respectively.

- Perform the test run for about 10 minutes in both the cooling mode

and the heating mode.

• You can perform the test run in the cooling/heating mode by utilizing

the thermo sensor of the indoor unit.

Cooling mode: Warm the thermo sensor using an appliance such as

a hair dryer.

Heating mode: Put a cold towel on the thermo sensor.

Instructions for the Customers



• Explain to the customers the proper operation procedure and let them
operate the air conditioner along with the supplied instruction manual.

• When multiple indoor units are connected to the outdoor unit, the cooling
mode and the heating mode are not available at the same time.

When multiple indoor units are running at the same time, the operation

mode of the unit which starts running fi rst is applied to the other units.

• When you start running the indoor unit or change the operation mode, the
unit starts running after 3 minutes. This is due to the protection function of
the unit, not a malfunction.

• When the external temperature becomes low, the pre-heating of the
compressor starts to protect it. Keep the circuit breaker on for use.

The electricity consumption during pre-heating is about 30 W.
If the circuit breaker is turned off, the indoor unit may not start running for

about 10 minutes or more.

• Electronic expansion valves are used for the outdoor unit.

When you turn on the power, the outdoor unit starts clattering every 1 or

2 months. This clattering is not a malfunction, but occurs when the unit is
returning to the default setting for optimised control.

• While an indoor unit is running in the heating mode, the outdoor unit
supplies refrigerant to the other indoor units which are not running.

Therefore, noise may come from the other indoor units or the exterior of

them may become warm.

14

Outdoor Unit Installation Manual

Pump-down Operation

10

Pump-down Operation (Recovering refrigerant)



CAUTION

Since the forcible running for collecting
refrigerant stops automatically after
10 minutes, fi nish collecting refrigerant
within 10 minutes.

Electric current is applied on the
control board. Beware of electric
shock.

• The following must be certainly done
during pump down.

• Do not incorporate air into the

refrigeration cycle.

• Close the service valves. Stop

the compressor and remove the
refrigerant pipe.

If the refrigerant pipe is removed

when the compressor is operating
and service valves are opened, the
refrigerant cycle will inhale unwanted
matter such as air and the pressure
in the cycle becomes abnormally
elevated. It may cause a burst or injury.

1. Remove the valve cover screws.

2. Pull the valve cover in the direction of arrow, and remove it.

Valve cover

LED Service switches

D801

D803

D802

D804

D805

D800

3. Turn on the circuit breaker to supply electricity.
In the initial LED display status, D805 is lighted as below.

 : ON,  : OFF, : Rapid Flashing (5 times/sec.),

D800 D801 D802 D803 D804 D805



Start running all the indoor units connected to the outdoor unit in the
cooling mode.
The checking procedure cannot be completed if the cooling mode is not
operated in every indoor units.

SW02

SW01

¯ : Slow Flashing (1 time/sec.)

4. Hold down SW01 for at least 5 seconds, and check that D800 is lighted
and D804 light is fl ashing (1 time/sec.).

D800 D801 D802 D803 D804 D805

¯ 

5. Press SW01 for 1 time. Then D804 light is fl ashing (5 times/sec.).

D800 D801 D802 D803 D804 D805



6. Press SW02 for 1 time. Then D805 light is fl ashing (5 times/sec.).

D800 D801 D802 D803 D804 D805



7. Hold down SW02 for at least 5 seconds. Then outdoor unit start cooling
mode.

(The display is kept during the refrigerants collection operation.)

D800 D801 D802 D803 D804 D805

¯ 

8. Close the valve stem of the service valve at the liquid end.

9. Make sure that the compound pressure gauge reading is –101 kPa (–76
cmHg)

10. Close the valve stem of the service valve at the gas end.

11. The refrigerants collection operation is fi nished in maximum 10 minutes.

After the collection is fi nished, promptly stop the operation of all the

indoor unit.

(There are cases that the compressor restarts.)

12. When you want to start over the operation of the SW01 and SW02, press

the SW01 and SW02 at the same time for 5 sec. (It back to the initial

condition of 3.)
However, do not execute the operation during the refrigerants collection.
If by any chance the collection is stopped by the operation, start over the

refrigerants collection operation.

Troubleshooting

11

You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C.
board of the outdoor unit in addition to using the check codes displayed on
the remote controller of the indoor unit.
Use the LEDs and check codes for various checks. Details of the check
codes displayed on the remote controller of the indoor unit are described in
the Installation Manual of the indoor unit.

LED displays and check codes

 : ON (* : 3 sec ON/0.5 sec OFF),  : OFF

Display

D800

D801

D802

D803

(YL)

(YL)

(YL)



* 

* 

* * 

* 

* * 

* * 

* * * 

* 

* * 

* * 

* * * 

* * 

* * * 

* * * 

* * * * 

*

* *

* *

* * *

* * *
* *

* * *

* * *

* * * *

(YL)

D804

(YL)

Indoor

check

D805

code

(GN)

-

Normal operation (no error)
1C Compressor case thermostat error
21 High pressure switch error
1C Compressor system error
1D Compressor lock
1F Compressor breakdown
14 Driving element short circuit
16 Position detection circuit error
17 Current detection circuit error
1C Communication error between MCU
1A Fan system error
1E Discharge temperature error

Discharge temperature sensor
19

(TD) error

Outdoor air temperature sensor
1B



(TO) error

Suction temperature sensor (TS)
18

error

Heat exchanger temperature
18

sensor (TE) error

Gas pipe (unit A) temperature
1C

sensor (TGa) error

Gas pipe (unit B) temperature
1C

sensor (TGb) error

Gas pipe (unit C) temperature
1C

sensor (TGc) error

- PMV error (SH≥20)

- PMV error (SH≤–8)
20 PMV leakage error (unit A)
20 PMV leakage error (unit B)
20 PMV leakage error (unit C)

- Miswiring (mispiping) check error

Description



15

Outdoor Unit Installation Manual

Existing pipes: Cannot be used.

• Use new pipes.

YES

NO

NO

YES

Nitrogen gas pressure 0.5 MPa

(If there is discharge of remains, it is judged that a

large quantity of remains are present.)

Clean the pipes or use new pipes.

YES

NO

size due to pipe compression

Piping necessary to change the fl are nut / machining

muddy or black color.)

(mm)

Ø6.4 Ø9.5 Ø12.7

Copper pipe outer

diameter

For R32, R410A 17 22 26

For R22 Same as above 24

H

1) Flare nut width: H

(mm)

Ø6.4 Ø9.5 Ø12.7

Copper pipe outer

2) Flare machining size: A

Test run

diameter

For R32, R410A 9.1 13.2 16.6

For R22 9.0 13.0 16.2

Becomes a little larger for R32

A

Do not apply refrigerator oil to the flare surface.

• Refrigerant recovery: Pump down method

cooling mode for approx. 30 minutes or longer,*

Are there scratches or dents on the existing pipes?

Is it possible to operate the existing air conditioner?

with the oil and rust has been generated inside

refrigerant has been recovered.

normal oil.

• The refrigerator oil is copper rust green in color:

6. When the existing air conditioner is removed after

There is the possibility that moisture has mixed

Check if the oil is judged to be clearly different from

recover the refrigerant.

• After the existing air conditioner is operated in

• For cleaning the pipes and recovering oil

the pipe.

residue, or a bad smell.

residue can be seen in the refrigerant oil.

• There is discolored oil, a large quantity of

• A large quantity of shiny metal dust or other wear

piping and carry out fl ushing (nitrogen pressure

0.5 MPa) to remove any remains inside of the

• Remove the existing air conditioner from the

shiny metal dust, or other wear residue or

mixture of foreign matter is observed, trouble will

compressor failing and being replaced.

occur.

• When discolored oil, a large quantity of residue,

7. When the air conditioner has a history of the

of remains discharged? (When the oil

Was largely discolored oil or a large quantity

pipe.

conditioner are repeated such as when leased etc.

8. When temporary installation and removal of the air

deteriorates, the color of the oil changes to a

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.

• The winding-insulation of the compressor may

9. If the type of refrigerator oil of the existing air

indoor / outdoor units. (Do not use the fl are nut of

the existing pipe.)

Connect the indoor / outdoor units to the existing

pipe.

• Use a fl are nut attached to the main unit for the

deteriorate.

length for total unit, specifi ed in clause 3, be sure

10. When total pipe length is longer than the maximum

R32.

• Re-machine the fl are machining size to size for

to use new pipes for the refrigerant piping works.

NOTE

The above descriptions are results have been

confi rmed by our company and represent our views on

our air conditioners, but do not guarantee the use of

Gas leak check

• (Airtight test), Vacuum dry, Refrigerant charge,

Pinching or taping

Term Curing manner

1 month or more Pinching

Less than 1 month

or foreign matter due to condensation enters the

pipes.

pipes are necessary.

Curing of pipes

When removing and opening the indoor or outdoor unit

for a long time, cure the pipes as follows:

the existing pipes of air conditioners that have adopted

R32 in other companies.

• Otherwise rust may be generated when moisture

Placement

• The rust cannot be removed by cleaning, and new

location

Outdoors

Indoors Every time

Appendix

Work instructions

The existing R22 and R410A piping can be reused for

inverter R32 product installations.

12

WARNING

Confi rming the existence of scratches or dents on

the existing pipes and confi rming the reliability of

the pipe strength are conventionally referred to the

local site.

If the specifi ed conditions can be cleared, it is

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.)

possible to update existing R22 and R410A pipes

to those for R32 models.

2. Clean (There is no dust inside of the pipes.)

that of R22). If there is a scratch or dent on

the pipe or a thinner pipe is used, the pressure

new pipes for the refrigerant piping works.

specifi ed “Pipe diameter and thickness,” be sure to

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.

3. Tight (There are no refrigerant leaks.)

1. When a scratch or dent is heavy, be sure to use

use new pipes for the refrigerant piping works.

2. When the existing pipe thickness is thinner than the

strength may be inadequate, which may cause

• The operating pressure of R32 is high (1.6 times

16

0.8 0.8 0.8

R22

R32, R410A

the pipe to break in the worst case.

Pipe outer diameter Ø6.4 Ø9.5 Ø12.7

Thickness

* Pipe diameter and thickness (mm)

3. When the outdoor unit was left with the pipes

including moisture, entering the pipe.

disconnected, or the gas leaked from the pipes and

the pipes were not repaired and refi lled.

• There is the possibility of rain water or air,

4. When refrigerant cannot be recovered using a

dirty oil or moisture remains inside the pipes.

refrigerant recovery unit.

• There is the possibility that a large quantity of

been generated.

the existing pipes.

• There is the possibility that copper green rust has

5. When a commercially available dryer is attached to

144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand

1116691098-1