Toshiba RBM-Y1801FU4PE User manual

RBM-Y1801FU4PE
RBM-Y1801FU8PE
RBM-Y1801FU12PE
Installation Manual
Flow Selector unit Multi-port type
R32
English

EN-2EN-1
1
Flow Selector unit Multi-port type (hereafter "Flow Selector unit")
Thank you very much for purchasing TOSHIBA Super Heat Recovery Multi Advance (SHRM-A) Air conditioner.
Please read this manual carefully before using your Flow Selector unit.
• When installing an indoor or outdoor unit, follow the Installation Manual supplied with the unit.
• To connect the Flow Selector unit to an outdoor unit with pipes, a branching joint or header is required.
Choose one according to the capacity of the units.
ADOPTION OF R32 REFRIGERANT
The Super Heat Recovery Multi Advance has adopted a refrigerant HFC (R32) which does not destroy the
ozone layer. This Flow Selector unit is for the R32 refrigerant only. Be sure to use an indoor or outdoor unit in
combination with the R32 refrigerant.
CONTENTS
Accessory parts and Parts to be procured locally ............................. 2
1PRECAUTIONS FOR SAFETY................................................ 2
2SELECTION OF INSTALLATION PLACE ................................... 5
3INSTALLATION OF FLOW SELECTOR UNIT............................... 7
INSTALLATION OF BATTERY KIT ........................................... 8
4REFRIGERANT PIPING........................................................ 9
5ELECTRICAL CONNECTION ................................................ 12

EN-4EN-3 2
Accessory parts and Parts to be procured locally
Accessory parts
Part name Q’ty RBM-Y1801 Shape Usage
FU4PE FU8PE FU12PE
Installation Manual 1 1 1 This manual
This manual for installer.
(For other languages that do not
appear in this Installation Manual,
Please refer to the enclosed
CD-ROM.)
CD-ROM 1 1 1 −
(For other languages Installation
Manual, please refer to the
enclosed CD-ROM.)
Heat insulating pipe Ø55 8 16 24 For indoor unit connection
Attached pipe
Ø9.5 −Ø6.4 4 8 12 For liquid pipe of indoor unit
connection
Ø15.9 −Ø12.7 −Ø9.5 4 8 2 For gas pipe of indoor unit
connection
Attached pipe for
main-pipe
Ø28.6 −Ø22.2 1 1 1 For suction gas pipe of outdoor
unit connection
Ø28.6 −Ø19.1 1 1 1
Ø22.2 −Ø19.1 1 1 1 For high pressure / low pressure
gas pipe of outdoor unit
connection
Ø22.2 −Ø15.9 1 1 1
Ø15.9 −Ø12.7 1 1 1 For liquid pipe of outdoor unit
connection
Binding band (L300) 8 16 24 For fixing heat insulating pipes
Cable clamp 3 3 3 For fixing indoor unit
communication cables
Washer 8 8 8 M10 × Ø34 For hanging the unit
Stopper pipe
Ø9.5 2 2 2 For liquid pipe of indoor unit
connection
Ø15.9 2 2 2 For gas pipe of indoor unit
connection
Heat insulator for
stopper pipe
Ø22 2 2 2 For liquid pipe of indoor unit
connection
Ø36 2 2 2 For gas pipe of indoor unit
connection
1PRECAUTIONS FOR SAFETY
• Ensure that all Local, National and International regulations are
satisfied.
• Read this “PRECAUTIONS FOR SAFETY” carefully before
Installation.
• The precautions described below include the important items
regarding safety. Observe them without fail.
• After the installation work, perform a trial operation to check for
any problem.
Follow the Owner’s Manual to explain how to use and maintain
the unit to the customer.
• Turn off the main power supply switch (or breaker) before the
unit maintenance.
• Ask the customer to keep the Installation Manual and explain the
customer in detail of this installation completion state.

EN-6EN-5
3
Meanings of symbols in this manual
These safety cautions describe important matters concerning
safety to prevent injury to users or other people and damages to
property. Please read through this manual after understanding the
contents below (meanings of indications), and be sure to follow the
description.
Indication Meaning of Indication
WARNING
Text set off in this manner indicates that failure
to adhere to the directions in the warning could
result in serious bodily harm (*1) or loss of life if
the product is handled improperly.
CAUTION
Text set off in this manner indicates that failure
to adhere to the directions in the caution could
result in slight injury (*2) or damage (*3) to
property if the product is handled improperly.
*1: Serious bodily harm indicates loss of
eyesight, injury, burns, electric shock, bone
fracture, poisoning, and other injuries which
leave aftereffect and require hospitalization
or long-term treatment as an outpatient.
*2: Slight injury indicates injury, burns,
electric shock, and other injuries which
do not require hospitalization or long-term
treatment as an outpatient.
*3: Damage to property indicates damage
extending to buildings, household effects,
domestic livestock, and pets.
WARNING
(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.
REQUIREMENT
For precautions regarding R32 refrigerant, refer to “Precautions
for using R32 refrigerant” in the indoor unit and outdoor unit
Installation Manual.

EN-8EN-7 4
WARNING
• Ask an authorized dealer or qualified installation
professional to install/maintain the air conditioner.
Inappropriate installation may result in water leakage, electric
shock or fire.
• Turn off the main power supply switch or breaker before
attempting any electrical work.
Make sure all power switches are off. Failure to do so may cause
electric shock.
• Connect the connecting wire correctly.
If the connecting wire is connected in a wrong way, electric parts
may be damaged.
• When moving the air conditioner for the installation into
another place, be very careful not to enter any gaseous
matter other than the specified refrigerant 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 as a result causes pipe burst and injuries on persons.
• Do not modify this unit by removing any of the safety
guards or by by-passing any of the safety interlock
switches.
• Exposure of unit to water or other moisture before
installation may cause a short-circuit of electrical parts.
Do not store it in a wet basement or expose to rain or water.
• After unpacking the unit, examine it carefully if there is
possible damage.
• Do not install in a place that might increase the vibration of
the unit.
• To avoid personal injury (with sharp edges), be careful when
handling parts.
• Perform installation work properly according to the
Installation Manual.
Inappropriate installation may result in water leakage, electric
shock or fire.
• When the air conditioner is installed 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.
• Install the air conditioner securely in a location where the
base can sustain the weight adequately.
• Perform the specified installation work to guard against an
earthquake.
If the air conditioner is not installed appropriately, accidents may
occur due to the falling unit.
• If refrigerant gas has leaked during the installation work,
ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious
gas may generate.
• After the installation work, confirm that refrigerant gas does
not leak.
If refrigerant gas leaks into the room and flows near a fire source,
such as a cooking range, noxious gas might generate.
• Electrical work must be performed by a qualified electrician
in accordance with the Installation Manual.
Make sure the air conditioner uses an exclusive power
supply.
An insufficient power supply capacity or inappropriate installation
may cause fi
re.

EN-10EN-9
5
• Use the specified wires for wiring connect the terminals
securely fix.
To prevent external forces applied to the terminals from
affecting the terminals.
• Conform to the regulations of the local electric company
when wiring the power supply.
Inappropriate grounding may cause electric shock.
• Do not install the air conditioner in a location subject to a
risk of exposure to a combustible gas.
If a combustible gas leaks, and stays around the unit, a fire may
occur.
CAUTION
This Air Conditioner has adopted a refrigerant HFC (R32)
which does not destroy the ozone layer.
• As the R32 refrigerant is easily affected by impurities such
as moisture, oxidized film, oil, etc., due to the high pressure,
be careful not to allow the moisture, dirt, existing refrigerant,
refrigerating machine oil, etc., to get mixed up in the refrigeration
cycle during the installation work.
• A special tool for the R32 or R410A refrigerant is required for
installation.
• Use a new and clean piping materials for the connecting pipe
so that moisture and dirt are not mixed together during the
installation work.
2SELECTION OF INSTALLATION PLACE
CAUTION
Do not install the air conditioner at place where combustible gas may leak.
If gas leaks is collected at surrounding the unit, the production of fire may be caused.
Cautions for Installation at a Place with the Quiet Background Sound
As the Flow Selector unit incorporates the Pulse motor valve, the refrigerant sound or the operating sound of
the Pulse motor valve such as “Bushuu...” generates when exchanging between cooling and heating mode and
during defrost operation. Therefore, avoid installing the unit at a place with quiet background sound as follows.
(1) Rooms with quiet background sound such as bedroom, hospital, or room in a hotel.
(2) Rooms which have no ceiling and a fabric does not block the residence space from the Flow Selector
unit.
(3) Rooms which have opening port at the ceiling.
Flow Selector unit Indoor unit
10 m or more
When installing the unit at the above places, separate the unit from the indoor unit (more than 10 m) and install
the unit at a place so that sound does not transmit into the room such as in the corridor ceiling.
And take sound proof measure, such as covering around the Flow Selector unit with the sound proofing
materials.
Upon customer’s approval, install the air conditioner at a place where satisfies the following conditions.
• Place where Flow Selector unit can be installed horizontally.
• Place which can reserve a service space for safe maintenance or check.
Apply electric insulation between metal section of the building and metal section of the air conditioner in
conformance with the Local Regulation.
Avoid the following places.
• Salty place (seaside area) or place with much gas sulfide (hot spring area)
(If selecting such a place, a special maintenance is required.)
• Place where oil (including machine oil), steam, oil smoke or corrosive gas generates.
• Place where a device generating high frequency (inverter, non-utility generator, medical apparatus, or
communication equipment) is set. (A bad influence may generate by malfunction of the air conditioner, control
trouble, or noise for such equipment.)

EN-12EN-11 6
Installation under high-humidity atmosphere
In some cases including the rainy season, especially inside of the ceiling may become high-humidity atmosphere.
1. Installation to inside of the ceiling with tiles on the roof
2. Installation to inside of the ceiling with slated roof
3. Installation to a place where inside of the ceiling is used for pathway to intake the fresh air
4. Installation to a kitchen
• In the above cases, additionally attach the heat insulator to all positions of Flow Selector unit, which come to
contact with the high-humidity atmosphere.
[Installation condition for additional insulation]
When the dry-bulb temperature inside the ceiling is 28°C or the relative temperature exceeds 80%
(The shaded area on the psychrometric chart.)
Installation condition
for additional
insulation
Relative humidity 80%
28°CDB
Psychrometric Chart
Installation and service space
Reserve sufficient space required for installation or service work.
• Make space for installation and service. (Make space to the electrical parts box cover side for service.)
• When installing the unit inside the ceiling, be sure to create a check port.
The check port is required when the unit is installed and serviced.
• Keep a clearance of 100 mm or more between the top panel of the unit and the ceiling.
<Installation space>
(Unit : mm)
100 or more
100 or more
550 or more
300
or more
Bolt size : M10 or Ø3/8
(field supply)
Service hole
450
(Y1801FU12PE
only)
Service hole
450
Check port
600 or more
50
Enough space
to connect the
site pipe
Control Box
50
450 or more
70

EN-14EN-13
7
Installation of hanging bolt
Use M10 hanging bolts (4 pcs, locally procured).
Matching to the existing structure, set pitch according to size in the unit external view as shown below.
New concrete slab
Install the bolts with insert brackets or anchor bolts.
(Blade type
bracket)
(Slide type bracket) Anchor bolt
Rubber
(Pipe hanging
anchor bolt)
Steel frame structure
Use existing angles or install new support angles.
Hanging bolt
Hanging bolt Support angle
Existing concrete slab
Use a hole-in anchors, hole-in plugs, or a hole-in bolts.
Installation of Flow Selector unit
Treatment of ceiling
The ceiling differs according to structure of building.
For details, consult your constructor or interior finish contractor.
In the process after the ceiling board has been removed, it is important to reinforce ceiling foundation (frame) and
to keep horizontal level of installed ceiling correctly in order to prevent vibration of ceiling board.
• Attach the nuts and the M10 flat washers to the hanging bolt.
• Put washers at up and down of the hanging bracket of the Flow Selector unit to hang down the Flow Selector
unit.
• Check that four sides are horizontal with a level gauge. (Horizontal degree: Within 5 mm)
Hanging bolt (W3/8 or M10)
70 mm or less
M10 flat washer (Accessory)
Nut (W3/8 or M10)
Unit
M10 flat washer (Accessory)
3INSTALLATION OF FLOW SELECTOR
UNIT
WARNING
Install the unit securely in the place to sufficiently withstand the weight of the unit.
If the foundation is not sturdy enough, the unit may fall and cause personal injury.
Perform a specified installation work to guard against earthquake.
Improper installation may cause the unit to fall.
REQUIREMENT
Strictly comply with the following rules to prevent damage of the Flow Selector unit and human injury.
• Do not put a heavy article on the Flow Selector unit or let a person get on it. (Even units are packaged)
• Carry in the Flow Selector unit as it is packaged if possible. If carrying in the Flow Selector unit unpacked by
necessity, use buffering cloth or other material to not damage the Flow Selector unit.
• To move the Flow Selector unit, hold the hooking brackets (4 positions) only.
Do not apply force to the other parts (refrigerant pipe, drain pan, foamed parts, resin parts or other parts).
• Carry the package by two or more persons, and do not bundle it with plastic band at positions other than
specified.
Installation of hanging bolt
• Consider the piping / wiring before the unit is hung to determine the location of the Flow Selector unit installation
and orientation.
• After the location of the Flow Selector unit installation has been determined, install hanging bolts.
• For the dimensions of the hanging bolt pitches, refer to the external view.
• When a ceiling already exists, lay the refrigerant pipe, control wires, and remote controller wires to their
connection locations before hanging the Flow Selector unit.
Procure hanging bolts washer and nuts for installing the Flow Selector unit (these are not supplied).
Hanging bolt M10 or W3/8 4 pieces
Nut M10 or W3/8 12 pieces

EN-16EN-15 8
External view
(Unit : mm)
A
B
Control Box
Pitch
Liquid pipe
Gas pipe
Refrigerant pipe
connection port
indoor unit side
(Hanging bolt pitch)
(Unit external dimension)
468
334100 (34)
(Hanging bolt
pitch) (Unit external dimension)
Pitch
HP/LP gas pipe
Liquid pipe
Suction gas pipe
Refrigerant pipe
connection port
outdoor unit side
Communication wire intake port
(Ø26)
Power supply wire
intake port (Ø20)
(Hang-up plate bottom)
RBM-Y1801*** A B
FU4PE 338 407
FU8PE 578 647
FU12PE 818 887
293
156
134
78
29
48 24
118
405
277
127
42
250 243
170
120
81
60
120
31
HP: high pressure
LP: low pressure
Installation of Battery kit (TCB-BT1UPE)
• One Battery kit is required for each P.C. board of Flow Selector unit. If even one port of an indoor unit is
connected to each P.C. board, a Battery kit for it is required. Refer to the Installation Manual of the outdoor unit
for details.
• Do not connect anything except TOSHIBA Battery kit.
• This kit includes a nickel-metal hydride battery (NiMH). For your safety, please read Instruction Manual in
Battery kit carefully and handle it with care.
• Do not touch this kit for at least 1 minute after disconnecting power supply at servicing.
1. Loosen the upper side of the cover attachment screws (2 positions) of the electrical control box, and remove
the lower side of the screws (2 positions) to remove the cover.
2. Install the Battery kit with the two screws (accessory of Battery kit) in the orientation shown in the figure.
When installing the Battery kit, be careful not to let the Battery kit contact the P.C. board of Flow Selector unit
and do not pinch the wires with the Battery kit.
3. Connect the connector of the Battery kit to CN521 (RED) on the P.C. board of the Flow Selector unit, which is
located on the right side when viewed from the Battery kit.
4. Turn on the No.4 DIP switch of SW03 on the P.C. board where the connector is connected.
Screw
(upper side)
Battery kit
Screw
(Accessory)
Electrical
control box cover
Screw
(lower side)
Screw
(upper side)

EN-18EN-17
9
1234
ON
SW03
Switch only the No. 4 DIP switch of SW03 to ON
Battery kit Screw
(Accessory of Battery kit)
Do not bundle with communication wire
Screw
(Accessory of
Battery kit)
Connect to CN521
CAUTION
Do not pull the wire too hard. The connector inside the Battery kit may come off.
Incorrect
Do not connect the Battery kit to the P.C. board on the left.
Battery kit
4REFRIGERANT PIPING
WARNING
If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious gas may be generated.
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 fan heater, cooking stove or heating
unit, noxious gas may be generated.
Permissible pipe length and permissible height difference
For piping dimensions, follow the Installation Manual attached to the outdoor unit.
REQUIREMENT
When the refrigerant pipe is long, set the support brackets to fix the pipe at intervals of 2.5 to 3 m.
If the pipe is not fixed, noise may be generated.
Connection pipe size of Flow Selector unit (default)
(Unit : mm)
RBM-Y1801****
Outdoor unit side
(Upstream)
Indoor unit side
(Downstream)
Suction gas
pipe HP/LP gas pipe Liquid pipe Gas pipe Liquid pipe
FU4PE
Ø28.6 Ø22.2 Ø15.9 Ø15.9 Ø9.5FU8PE
FU12PE
HP: high pressure
LP: low pressure

EN-20EN-19 10
Pipe connecting process
• Connect the pipes. (Be sure to use port No.1)
• Use attached-pipe (accessory) to connect the pipe with different diameter from the pipe to Flow Selector unit.
HP/LP gas pipe
HP: high pressure
LP: low pressure
Suction gas pipe
Liquid pipe
Attached pipe
for main-pipe
(Accessory) Attached pipe
(Accessory)
Be sure to use port No.1
Liquid pipe
Gas pipe
• Use stopper-pipe (accessory) to the port to which indoor unit is not connected.
Be sure to use port No.1
Stopper pipe
(Accessory)
• Be sure to connect the indoor unit to port No. 1 of the Flow Selector unit. (Figure 1)
• Allows the concatenation of two neighboring ports.(Connecting pipes are arranged locally.) (Figure 2)
• The maximum capacity of the indoor unit that may be connected downstream of the combined port is 12.8 HP
(horsepower).
• Please observe the following
• Do not combine more than 3 ports. (Figure 3)
• Do not make connections between non-adjacent ports. (Figure 4)
• Do not combine Port No.4 and No.5 (in the case of 8 port and 12 port models) and Port No.8 and No.9
(in the case of 12 port model). (Figure 5)
• Do not combine Port No.2 and No.3, Port No.6 and No.7, Port No.10 and No.11. (Figure 6)
TFigure 1 TFigure 2
Incorrect Correct
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit
Port No.1
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit
TFigure 3 TFigure 4
Incorrect Incorrect
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit

EN-22EN-21
11
TFigure 5
Incorrect
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit Port No.5 Port No.9
TFigure 6
Incorrect
Outdoor unit
Piping
Flow Selector unit Multi-port type
Indoor unit Port No.3 Port No.7 Port No.11
CAUTION
* Be sure to wrap the pipe with wet cloth when applying brazing.
Wet cloth
Remove the cap.
Insert the connecting pipe.
Apply brazing to full circumference.
• For a brazing work of the refrigerant pipes, be sure to use nitrogen gas in order to prevent oxidation of the inside
of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale may occur.
* Remove all flux after brazing.
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and gas leak check, follow the Installation Manual attached to
the outdoor unit.
REQUIREMENT
Be sure to use the tool such as charge hose exclusive to R32 or R410A.
Do not turn on the power until the airtight test and the vacuuming have finished.
(If turning on the power, the incorporated PMV is closed fully and the period until the vacuuming finishes
elongates.)
Open fully valves of the outdoor unit
Gas leak check
Check with a leak detector or soap water whether gas leaks or not, from the pipe connecting section.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC refrigerant (R32, R410A, R134a, etc.).
Heat insulating process
Perform heat insulating for each pipes
separately.
In cooling time, temperature at both liquid
and gas sides becomes lower.
Therefore, perform heat insulating process
sufficiently to avoid dewing.
• For heat insulator of pipe at gas side, be
sure to use one with heat-resisting temp.
120°C or more.
• Using the attached heat insulating pipe,
perform heat insulating process securely
for pipe connecting part of the Flow
Selector units without clearance.
The slit shall be
upper side.
Flow Selector unit
Heat insulating
pipe (Attached)
Heat insulator
• Indoor unit side
Heat insulating pipe
(Accessory)
Heat insulating pipe
(locally procured)
Binding band
(Accessory)
[Port with the pipe connected.]
Heat insulating pipe
(Accessory)
(Stopper-pipe)
Binding band
(Accessory)
[Port without the pipe.]
Heat insulating pipe
(Accessory)
• Outdoor unit side
Binding band
(Accessory)
[Side with the pipe connected.]
Heat insulating pipe
(locally procured)
REQUIREMENT
Apply the heat insulation to the pipe connecting section of the Flow Selector unit securely up to the root without
exposure of the pipe. (The pipe exposed to the outside causes water leak.)

EN-24EN-23 12
5ELECTRICAL CONNECTION
CAUTION
• If incorrect / incomplete wiring is carried out, it will cause an electrical fire or smoke.
• Use the cord clamps attached to the product.
• Do not damage or scratch the conductive core and inner insulator of power and communication wires when
peeling them.
• Use the power cord and communication wire of specified thickness, type, and protective devices required.
• Do not connect 220-240 V power to the terminal blocks (A, B) for communication wiring. (Otherwise, the system
will fail.)
• Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe.
The coating may melt resulting in an accident.
REQUIREMENT
• For power supply wiring, strictly conform to the Local Regulation in each country.
• After connecting wires to the terminal blocks, provide a trap and fix wires with the cord clamp.
• Run the refrigerant piping line and communication wiring line in the same line.
• Do not turn on the power of the Flow Selector unit until vacuuming of the refrigerant pipes completes.
• This Flow Selector unit has multiple ports. So piping and wiring to the same indoor unit shall be connected to the
same number (1, 2, 3, 4 …) of port.
Power supply wire and communication wires specifications
Power supply wire and communication wires are locally procured.
For the power supply specifications, follow to the table below. If capacity is little, it is dangerous because overheat
or burnout may be caused. For system wiring diagram, follow the Installation Manual attached to the outdoor unit.
Power supply
• Power supply wire specification: Cable 3-core 2.5 mm², in conformity with Design 60245 IEC 57.
Power supply 220-240 V ~, 50 Hz
220 V ~, 60 Hz
Power supply switch / circuit breaker or power supply wiring / fuse rating for Flow Selector units should be
selected by the accumulated total current values of the Flow Selector units.
Power supply wiring Below 50 m 2.5 mm²
Safety device
• This circuit must be protected with the required safety devices like a main switch, a slow blow fuse on each
phase and an earth leakage circuit breaker.
• When using residual current operated circuit breakers, be sure to use a high-speed type (0.1 second or less)
30 mA rated residual operating current.
RBM- MCA (A) MOCP (A)
Y1801FU4PE 0.6
15Y1801FU8PE 0.9
Y1801FU12PE 1.2
MCA: Min. Circuit Amps
MOCP: Maximum Overcurrent Protection (Amps)
Communication wiring
• 2-core with non-polarity wire is used for wiring of the communication wiring.
• Wire size : 0.5 mm² to 2.0 mm²
• Up to 300 m (L1 + L2 + L3 + L4)
Ｌ
Ｌ
Ｌ
Ｌ
Indoor unit
Remote controller
Flow Selector unit
Leak Detector
CAUTION
The communication wiring and AC 220-240 V wires cannot be parallel to contact each other and cannot be
stored in the same conduits. If doing so, a trouble may be caused on the control system due to noise or
other factor.
Wire connection
REQUIREMENT
• Connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
• Pass the wires through the bushing of wire connection holes of the Flow Selector unit.
• Keep a margin (Approx. 100 mm) on a wire to hang down the electrical control box at servicing.
• The low-voltage circuit is provided for the communication wires. (Do not connect the high-voltage circuit)
1Loosen the upper side of the cover attachment screws (2 positions) of the electrical control
box, and remove the lower side of the screws (2 positions) to remove the cover.
2The cable clamp (accessory) is installed in the underside of the Flow Selector unit.
3Connect the power supply wire and communication wires to the terminal blocks of the
electrical control box.
4Tighten screws of the terminal block securely, and fix the wires with cord clamp attached
to the electrical control box. (Do not apply tension to the connecting section of the terminal
block.)
5Mount the cover of the electrical control box so that it does not pinch the wires.

EN-26EN-25
13
TConnecting power supply wire and communication wires
Screw
(upper side)
Electrical control box cover
Screw
(lower side)
Screw
(upper side)
Screw
(lower side)
A B
N L
Earth screw
Cable clamp
Power supply wire
Cable clamp
(Accessory)
Power supply terminal block
Cable clamp
(Accessory)
Clamp all cables
Communication wire terminal block
Communication wire
Clamp the communication wire
When wiring the communication wire from the right side.
A B
N L
Earth screw
Cable clamp
Power supply wire
Cable clamp
(Accessory)
Power supply terminal block
Cable clamp
(Accessory)
Clamp all cables
Communication wire terminal block
Communication wire
Clamp the communication wire
R
(L)
S
(N)
35
5
10
10
40 50
Communication wires
Earth wire
Power supply wire
See the figure on the left
for connecting wires to
the terminal.
2 mm or less
Communication wire
Communication wiring
A
B
A
B
Terminal block for
remote controller
wiring of indoor unit
Communication wires
(locally procured)
Flow Selector unit
terminal on PCB
In the case of connecting two ports
The communication wire should be connected only to the port with the smaller number.
(In the figure below, Port No.1 and Port No.3)
Set the DN code according to the Installation Manual of the outdoor unit.
12 34
Outdoor unit
Communication wire
Flow Selector unit Multi-port type
Indoor unit
Piping
Port No.

144 / 9 Moo 5, Bangkadi Industrial Park, Tivanon Road, Tambol Bangkadi, Amphur Muang, Pathumthani 12000, Thailand
1143012099