Technibel Climatisation CAVM93R5TA Series User manual

37.4163.233.0
INSTALLATION MANUAL
MANUALE D’INSTALLAZIONE
MANUEL D’INSTALLATION
FEBBRAIO 2004
Split system air conditioner
Condizionatore d'aria split system
Climatiseurs split system
EG
I
F
CAVM93R5TA-
CAVM123R5TA-
CAVM183R5TA-

CONTENTS
IMPORTANT: Please Read Before Starting
Special precaution
IMPORTANT: Precautions for new refrigerant R 407 C installation
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
1-1. Tools required for Installation (not supplied)
1-2. Type of copper Tube and Insulation Material
1-3. Additional materials required for Installation (not supplied)
2. INSTALLATION SITE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
3. DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
4. HOW TO INSTALL THE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
4-1. Suspending the Unit at the Ceiling
4-2. Installation of the condensate drain pipe
4-3. Duct for fresh air
5. HOW TO INSTALL THE REMOTE CONTROLLER (OPTIONAL PART) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
5-1. Operation controller installation
5-2. Room temperature sensor setting
5-3. Address switches
5-4. Setting the model code (only for heat pump models)
5-5. Test Run switch
5-6. Misoperation Alarm Indicators (only for Heat Pump models)
5-7. Wireless Remote controller Installation
5-8. How to install batteries (only for Heat Pump models)
6. HOW TO PROCESS TUBING (Only for PACKAGE outdoor units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12
6-1. Tubing length
6-2. Tubing size
6-3. Installing Distribution Joint
6-4. Optional Distribution Joint Kits
7. ELECTRICAL WIRING (Only for PACKAGE outdoor units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14
7-1. General Precautions on Wiring
7-2. Recommended Wire Length and Wire Diameter for Power Supply System
7-3. Wiring System Diagrams
8. PCB SETTING (Only for PACKAGE outdoor units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 20
8-1. R.C. Address Setting Method
8-2. Automatic Address Setting Method
8-3. Displaying Indoor / Outdoor Unit Combination Numbers
8-4. Test Run Procedure
EG
1
IMPORTANT PLEASE READ BEFORE STARTING
This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part
of your job to install or service the system so that it operates safely and efficiently.
For safe installation and trouble-free operation, you must:
• Carefully read this instruction booklet before beginning.
• Follow each installation or repair step exactly as shown.
• Observe all local, state, and national electrical codes.
• Pay close attention to all warning and caution notices given in this manual.

Outer diameter ø 6.35 ø 9.52 ø 12.7 ø 15.88 ø 19.05 ø 22.2 ø 25.4 ø 28.58
Wall thickness 0.8 0.8 0.8 1.0 1.0 1.2 1.0 1.0
2
PRECAUTIONS FOR NEW REFRIGERANT R 407 C INSTALLATION
1. Care regarding piping
1-1. There is no need to change piping and tube wall thickness. Use refrigerant pipes of the same wall thickness as R22.
Copper tube
1-2. Prevent impurities including water, dust and oxide
from coming into the pipe. Impurities can cause R407C
refrigerant deterioration and compressor defects. Due
to the different features of the refrigerant and
refrigerating machine oil, the prevention of water and
other impurities becomes more important than ever.
2. Make sure to refill the refrigerant in liquid form
2-1. Since R 407 C is a non-azeotrope, refilling the
refrigerant in gas form can lower performance and
cause defects of the unit.
2-2. Since refrigerant composition changes and
performance decreases when gas leaks, collect the
remaining refrigerant and refill the required total amount
of new refrigerant after fixing the leak.
3. Different tools
3-1. Tools specs have been changed due to the features
of R 407 C. Some of the R 22 tools cannot be used.
EG
WARNING • This symbol refers to
a hazard or unsafe
practice which can
result in severe
personal injury or
death.
IN CASE OF IMPROPER INSTALLATION
The manufacturer shall in no way be responsible for improper
installation or maintenance service, including failure to follow
the instruction in this document.
When Transporting
Be careful when picking up and moving the indoor and outdoor
units. Get a partner to help, and bend your knees when lifting
to reduce strain on your back. Sharp edges or thin aluminum
fins on the air conditioner can cut your fingers.
When Installing
…In a Room
Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to walls
and floors.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents water
damage and abnormal vibration.
…In an area with High Winds
Securely anchor the outdoor unit down with bolts and a metal
frame. Provide a suitable air baffle.
When Connecting Refrigerant Tubing
• Executive enough ventilation in case refrigerant gases leak
during operations. Be careful that the contact of the
refrigerant gases with the flare will cause the generation of
poisonous gases.
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the
flare and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.
• Check carefully for leaks before starting the test run.
When Servicing
• Turn the power OFF at the main power box (mains) before
opening the unit to check or repair electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
CAUTION • This symbol refers to
a hazard or unsafe
practice which can
result in personal
injury or product or
property damage.
SPECIAL PRECAUTION
• ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.
When Wiring
• Do not supply power to the unit until all wiring and tubing are
completed or reconnected and checked.
• Highly dangerous electrical voltage are used in this system.
Carefully refer to the wiring diagram and these instruction
when wiring. Improper connections and inadequate
grounding can cause accidentally injury or death.
•Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause
overheating at connection points and a possible fire hazard.

Vacuum
pump
3
Gauge manifold
Vacuum pump
Outlet
Inlet
Liquid
Valve
Product name
Gauge
manifold
Charge
hose
Leak
detector
Flaring oil
New
tools
Yes
Yes
Yes
Yes
Yes
R22 tools
compatible
with R407C
No
No
Yes
No
No
Remarks
Types of refrigerant and refrigerating machine oil, and pressure
gauge are different.
To resist pressure and oil, material has been changed.
Use a conventional vacuum pump if it is equipped with a check
valve. If it has no check valve, purchase and attach a vacuum
pump adaptor.
Leak detector for CFC an HCFC which react to chlorine do not
function because R407C contains no chlorine. Leak detector for
R407C can be used for HFC134a.
Mineral oil (for example, suniso oil) can be used as R22 oil. Use
synthetic fluid (for example, ether oil) as R407C oil.
* Using both R22 tools and new tools together can cause defects.
3-2. Use a R407C exclusive cylinder only. Single-outlet valve
(with siphon tube).
Liquid refrigerant can be
refilled standing it up
straight.
New refrigerant R407C cannot be used for existing models.
1. Compressor specs are different.
When refilling the R22 compressor with R407C, durability will significantly decrease since some
of the materials used for compressor parts are different.
2. Existing piping cannot be used.
Completely cleaning out residual refrigerating machine oil is impossible, even by flushing.
3. Refrigerating machine oil differs.
Since R22 refrigerating machine oil is mineral oil, it does not dissolve in R407C. Therefore,
refrigerating machine oil discharged from the compressor can cause compressor damage.
R22 refrigerating machine oil Mineral oil (suniso oil)
R407C refrigerating machine oil Synthetic fluid (ether oil)
R 407 C
1. GENERAL
This booklet briefly outlines where and how to install the air
conditioning system. Please read over the entire set of
instructions for the indoor and outdoor units and make sure all
accessory parts listed are with the system before beginning.
1-1. Tools Required for Installation (not
supplied)
1. Standard screwdriver
2. Philips head screwdriver
3. Knife or wire stripper
4. Tape measure
5. Level
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
11. Tube cutter
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
1-2. Type of Copper Tube and Insulation
Material
To purchase these material from a local source, you will need:
1. Deoxidised annealed copper tube for refrigerant tubing.
2. Foamed polyethylene insulation for copper tubes as
required to precise length of tubing. Wall thickness of the
insulation should be not less than 8 mm.
3. Use insulated copper wire for field wiring. Wire size varies
with the total length of wiring. Refer to Section 7. “Electrical
Wiring” for details.
EG

4
1-3. Additional Materials Required for
Installation (not supplied)
1. Refrigeration (armoured) tape
2. Insulated staples or clamps for connecting wire
(See your local codes.)
3. Putty
4. Refrigeration tubing lubricant
5. Clamps or saddles to secure refrigerant tubing
CAUTION • Check local electrical
codes and regulations
before connecting wire.
Also, check any
specified instructions
or limitations.
DO:
• select an appropriate position from which every corner of
the room can be uniformly cooled.
• select a location where the ceiling is strong enough to support
the weight of the unit.
• select a location where tubing and drain pipe have the
shortest run to the outside.
• allow room for operation and maintenance as well as
unrestricted air flow around the unit.
• install the unit within the maximum elevation difference (H)
above or below the outdoor unit and within a total tubing
length (L) from the outdoor unit as detailed in the section 6.
NOTE
Air delivery will be degraded if the distance from the floor to
the ceiling is greater than 3 m.
2. INSTALLATION SITE SELECTION
AVOID:
• areas where leakage of flammable gas may be expected.
• places where large amounts of oil mist exist.
• direct sunlight.
• location where nearby heat sources may affect performance
of the unit.
• locations where nearby external air may enter the room
directly. This may cause “sweating” in the air discharge ports,
causing them to spray or drip.
• location where the remote controller will be splashed with
water or affected by dampness or humidity.
• installing the remote controller behind curtains or furniture.
EG

5
Suspension brackets
Ceiling
Suspension brackets
Suspension bolt
Ceiling
Nuts and washers Electrical components box
Refrigerant tubing side
Fresh air intake side
Refrigerant tubing joint
(NARROW tube)
Refrigerant tubing joint
(WIDE tube) Condensate drain piping
3. DIMENSIONS (mm)
REFRIGERANT TUBING SIDE
SUSPENSION BRACKETS
NET WEIGHT
Model
UNIT
FRAME-GRILLE ASSEMBLY
CAVM9X-12X CAVM18X
EG

6
Before installing the unit, place the tubes, the electrical
wires and the condensate drain pipe in the proper position
for the connection.
Adjust the distance between the unit and the ceiling (max
23 mm) using the nuts of the four suspension bolts.
Verify also the distance between the suspension bracket 
and the ceiling (min 41 mm); a smaller distance can cause
noise in case the unit touches the ceiling.(fig. 4-3)
4-2 Installation of the condensate drain pipe
Utilise a hard, well insulated PVC pipe (I.D. 18 mm) and fix
it to the unit using a flexible PVC or gummy hose ; tighten
firmly with hose bands .
The connection must be well insulated, using foamed
polyethylene (thickness 8mm). (fig. 4-4)
• If it is necessary to increase the height of the drain pipe
somewhat, the portion directly after the connection port can
be raised a maximum of 25 cm. Do not raise it any higher
than 25 cm , as this could result in water leaks. (fig. 4-5)
• Do not apply force to the piping on the unit side when
connecting the drain pipe. The pipe should not be allowed
to hang unsupported from its connection to the unit. Fasten
the pipe to a wall, frame, or other support as close to the
unit as possible. (fig. 4-6)
• Do not install an air bleeder , as this may cause water to
spray from the drain tube outlet. (fig. 4-7)
• Do not install pipe with an upward gradient from the
connection port. It will cause the drain water to flow
backwards and leak when the unit is stopped. (fig. 4-8)
• Be sure to provide insulation for any drain piping installed
indoors.
Drill a 65 mm diameter hole, insert a PVC pipe. (fig. 4-9)
4. HOW TO INSTALL THE UNIT
EG
Fig. 4-1
Minimum operation and maintenance area. (fig. 4-1)
4-1 Suspending the Unit at the Ceiling
This unit uses a drain pump. Use a carpenter’s level to check
that the unit is levelled.
Determine the pitch of the suspension bolts using the
provided full-scale installation diagram .
The full-scale diagram must be placed in the centre between
the “T” bars; the “T” bar  on the side of the electrical
components box  must be removed temporary. Unit must be
installed in false ceiling only. (fig. 4-2)
Fig. 4-2
Fig. 4-3

7
4-3 Duct for fresh air
There is a duct connection port for drawing in fresh air.
The supplementary fan motor for outside air intake has to be supplied separately and controlled by a bipolar ON-OFF switch with
safety fuses.
Fresh air flow must be about 10% of the total air flow to avoid operating problems and noise.
• Open the knock-out hole , fix a  70 mm flange on the unit and connect the thermically insulated duct.
• Install an outside grille with filter inspection port to prevent dust and leaves from entering and fouling the indoor unit heat
exchanger.
EG
Fig. 4-9
Fig. 4-4 Fig. 4-5
Fig. 4-6
Fig. 4-7
Fig. 4-8

8
(1) Open the operation controller and disconnect the wires
provided with it. (fig. 5-1)
(2) Connect, in the same places, the wires coming from
grille assembly (6 poles) and Elec junction box (4 poles).
(fig. 5-2)
(3) Close the operation controller and fix it inside the unit.
Fasten the wires using the provided clampers.
(fig. 5-3)
For Cooling only models, disconnect the white connector CN8
from the indoor unit PCB.(fig. 5-4)
4P
4P
6P
6P
CN8 : LS
5-1 Operation controller Installation
EG
Fig. 5-1
Fig. 5-2 Fig. 5-3 Fig. 5-4
No. Accompanying parts Q’ty
Instruction Manual 1
Tapping screw 1
Tapping screw 1
Vinyl clamp L 150 3
Alarm message label 1
No. Accompanying parts Q’ty
Operation controller 1
Indicator section (do not utilize) 1
Wireless remote controller 1
AAA alkaline battery 1
■ACCESSORIES
•Outdoor Unit Cooling only models
5. HOW TO INSTALL THE REMOTE CONTROLLER (OPTIONAL PART)
Run Timer Heating preparations
Special
screw
4 x 16 mm
TOTA 4 x 16
No. Accompanying parts Q’ty
Operation controller 1
Indicator section (do not utilize) 1
Remote controller 1
Remote controller mounting 1
cradle
Battery 2
•Outdoor Unit Heat pump models
No. Accompanying parts Q’ty
Spacer 2
Instruction Manual 1
Pan-head tapping screw 4
4 x 10
Truss-head tapping screw 2
4 x 16
Vinyl clamp 3
L 150
ALARM MESSAGE LABEL 1

9
EG
ADDRESS
1 2 3
SENSOR
A/C/RCU
H/P
MODELS
NOTE
If the sensor switch is set to the remote controller side, but
no room temperature data is sent to the main unit for 10
minutes, the sensor is automatically switched to the indoor
unit side. As much as possible, install the remote controller
facing the unit.
5-2. Room Temperature Sensor Setting
The room temperature sensors are built into the indoor unit
and the wireless remote controller. Either of these room
temperature sensors can operate.
Heat pump models
The system is shipped from the factory set to the indoor unit
sensor. To switch to the remote controller sensor, press the
sensor switching button (* mark) on the rear of the remote
controller and check that A/C SENSOR on the LCD display
panel goes out.
Cooling only models
To switch to the remote controller sensor, press the A/C
SENSOR button on the remote controller and check that
the mark on the LCD display panel goes out. (Fig. 5-5).
5-3. Address Switches
•Heat pump models
If you are installing more than 1 indoor unit (up to 3) in the same room, it is necessary for you to assign each unit its own address
so they each can be operated by their remote controller.
Up to 3 indoor units can be controlled separately through the address switches. The operating control has the reception address
switch and the remote controller has transmission address switch. This function is utilised by matching the transmission and
reception address switches.
EX) 3 indoor units in 1 room
* Reception may be impossible if the remote controller is too far away. In this case, either use individual control or group control.
Operating indoor units A, B, and C with their own remote controllers Operating indoors units A, B, C
with 1 remote controller
Main Indoor unit address switch Remote controller address switch position (transmission)
unit type position (reception)
A unit
B unit
C unit
Align both the indoor unit and
remote controller address switch
positions at the same number.
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
•Cooling only models
The address switch setting function is not available on the remote controller. Be sure to set the ADDRESS switch on the operation
controller to 1 (Fig. 5-7).
ADDRESS SENSOR
Setting the model code
1 2 K S Corresponding model
■■ 4-way discharge, Ceiling suspended
5-4. Setting the Model Code
(only for heat pump models)
Check that the model code switch within the remote controller
battery compartment matches following.(fig. 5-6)
Model code
switch
Fig. 5-5
A
AIR CONDITIONER
SET TEMP.
1HR.
TIMER TEMP.
ON•I / OFF•
MODE
NIGHT
SETBACK
FLAP
FAN SPEED
SELECT
HH
MM
TIME SET
BATTERIES
ϒC
ACL A/C
SENSOR
OFF ON
CLOCK
TIMER
SELECT
S/C
MODELS
A/C SENSOR
button
Fig. 5-6

EG
NOTE
• In case of 4-way air discharge type, test run operations is
not possible without the ceiling panel installation.
• During the test run, all of the 3 indicator lamps on the indoor
unit will flash.
• During the test run, the air conditioner runs continuously
and the thermostat does not control the system.
• To protect the air conditioner from overloading, the outdoor
unit will not start running for 3 minutes after power is applied
or the air conditioner is turned off and then back on.
• When the air conditioner fails to start the test run, 1 or more
of the 3 alarm indicator lamps on the indoor unit will flash
(See next section - Heat pump models only).
5-5. Test Run Switch
Test run switch is located at operating control unit. See Fig. 5-7.
Regarding the test run, please refer to the Installation
Instructions provided with the outdoor unit.
Fig. 5-7
SERVICING
switches
All OFF for initial settings
1. TEST RUN (ON)
2. PCB CHK. (N)
3. RCU MAIN (OFF)
/ SUB (ON)
4. OFF
ADDRESS
NORM. HOLD SWEEP ON • l
OFF • O
ON
OFF
ADDRESS
switch
NORM./
HOLD
switch
SWEEP
button
ON/OFF
operation
button
10
5-6. Misoperation Alarm Indicators (only for heat pump models)
Alarm indicator lamps on the indoor unit indicate the error cause when the air conditioner fails to operate upon being switched
on. The possible alarm indications are given in the table below. Fig. 5-8 shows the location of the alarm lamps on the indoor
unit. .
Alarm
Cause of Trouble
OPERATION TIMER STANDBY
lamp lamp lamp
●●S.C. errors* between the indoor unit’s controller (PCB) and the remote controller.
●●Compressor protector is working.
●● S.C. errors between indoor and outdoor units.
●Indoor or aoutdoor thermistor is malfunctioning.
●Outdoor unit protector is working.
●Indoor unit protector is working.
TEST RUN switch on the operation controller is in ON state.
* S.C. : Serial communications
OPER. TIMER STDBY
OPERATION TIMER STANDBY Remote control
lamp lamp lamp receiver
Fig. 5-8
NOTE
Stick the alarm message label supplied with the
wireless remote controller on the electrical
component box to find the cause of trouble in
case of need.

11
EG
5-7. Wireless Remote Controller
Installation
The remote controller can be operated from either a non-
fixed position or a wall-mounted position.
To ensure that the air conditioner operates correctly, do not
install the remote controller in the following places:
• In direct sunlight.
• Behind a curtain or other place where it is covered.
• More than 8 m away from the air conditioner.
• In the path of the air conditioner’s airstream.
• Where it may become extremely hot or cold.
• Where it may be subject to electrical or magnetic
interference.
■REMOVABLE MOUNTING
•Heat pump models
Raise the rear plate of the remote controller mounting cradle
and insert the remote controller. The unit can be used either
in that position (placed on a table, for instance) or held in the
hand. (Fig. 5-9).
•Cooling only models
1) Momentarily hold the remote controller at the desired
mounting position.
2) Confirm that the air conditioner responds correctly when
you press keys on the remote controller from that
position.
3) After confirming correct operation, use a screw-driver
to screw the supplied special mounting screw into the wall
(Fig. 5-10).
4) Hang the remote controller from the mounting screw.
Rear plate
Remote control unit
mounting cradle
Remote control unit
Fig. 5-9
Special
mounting
screw
(Packed in
indoor unit)
Wall
Fig. 5-10
■NON-REMOVABLE MOUNTING
•Heat pump models
Install the remote controller at a convenient location on a
nearby wall. However, before attaching the remote controller
mounting cradle, check that the remote controller can operate
from the desired wall position. (Fig. 5-11)
•Cooling only models
1) Momentarily hold the remote controller at the desired
mounting position.
2) Confirm that the air conditioner responds correctly when
you press keys on the remote controller from that
position.
3) After confirming correct operation, use a screw-driver
to screw the mounting screw into the wall.
4) Remove the remote control cover by sliding it downward.
5) Remove the batteries of the remote controller.
6) Use a screwdriver to screw the remote controller securing
screw into the wall through the hole in the battery
compartment. (Fig. 5-12).
7) Replace the batteries.
8) Again confirm that the remote controller operates
correctly.
Wood screw
(supplied) Fig. 5-11
ACL button
Fig. 5-13
Wall
Screw
(Packed in indoor unit)
5-8. How to install batteries (only for heat
pump models).
See fig. 5-13
1) Press and slide the lid on the back of the remote controller
in the direction of the arrow.
2) Install two AAA alkaline batteries. Make sure the batteries
point in the direction marked in the battery compartment.
3) Press the ACL button, then replace the lid. If you press it,
the current time, ON time, and OFF time are all reset to
0:00.
Fig. 5-12

EG
6. HOW TO PROCESS TUBING (Only for PACKAGE Outdoor Units)
12
Multi type (Twin, Triple, Quartet)
Installation Example 1 Installation Example 2
0483_M_I
L3
L2
32
LA
1
T-joint
0482_M_I
L1
L2
LB LC
12
H1
H2
LA
3
4
Select and decide the installation location so that the length of the
refrigerant tubing will be within the limits given in Table.
Symbol meanings:
: Optional distribution joint kit (DDV1912)
: T-joint (field supply)
: Weld solidly (pinch shut)
+
Items Marks Length (m)
Allowable tubing length L1 Maximum tubing length Actual length
≤50
Equivalent length
≤70
L2 Maximum length from the No. 1 distribution joint
≤20
l 1, l2, l3, l4 Maximum length of each distribution branch ≤20
l 1, l2, l3 Total tubing lenght including lenght of each distribution ≤70
+ L1 branch
Max. allowable tubing length including lenght of each
≤30*
distribution branch at shipment
Allowable elevation H1 When outdoor unit installed higher
≤50
difference When outdoor unit installed lower
≤30
H2 Maximum difference between indoor units
≤4
Allowable lenght of L3 Maximum tubing lenght between the first T-joint and
≤1
header tube terminated (weld shut) end point
Contents
* If total tubing length including length of each distribution branch becomes 30 to 70 m, additional refrigerant charge is required.
See table below.
CAUTION
In case of multi type installation, indoor units should be installed in the same room. If indoor units are installed in different rooms,
temperature control may develop problems because the system operation follows the thermostat condition of one indoor unit
(main unit).
6-2. Tubing size
Main Tubing Size (L1, LA, LB, LC)
Main tube (LB, LC) OD
GRV25x GRV36,48x
Wide tube 15.88 (5/8) 19.05 (3/4) 19.05 (3/4) (or 15.88 (5/8))*
Narrow tube 9.52 (3/8) 9.52 (3/8) 9.52 (3/8)
Required additional 50 50 50
refrigerant (g/m)
Multi type (twin, Triple, Quartet)
Main tube (LA) OD
Distribution Branch Size ( ll 11 , ll 22)
Indoor unit type 9 type 12 type 18 type 25 type 36 type 48 type
Wide tube
Narrow tube
Required additional
refrigerant (g/m)
9.52 (3/8) *
50
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
NOTE
* In case of 25 type, use the “Tube connector” (accessory supplied with the indoor unit) for sizing up narrow tube from 6.35 to 9.52.
6-1. Tubing Length

EG
13
Always check the gas
density for the room in
which the unit is installed.
■Check of limit density
When installing an air-conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks outside,
its density does not exceed the limit level.
If the density might exceed the limit level, it is
necessary to set up an opening between it and the adjacent
room, or to install a mechanical ventilation which is interlocked
with the leak detector.
(Total refrigerant charged amount : kg)
Min indoor volume where the
indoor unit is installed : m
3
≤Limit density 0.3 (kg/m
3
)
The limit density of refrigerant which is used in this unit is 0.3
kg/m
3
(ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant fixed for each type; so add it to the amount that is
charged at the field.
(For the refrigerant charge amount at shipment, please refer
to the unit's nameplate.)
6-3. Installing Distribution Joint
(1) Refer to “HOW TO ATTACH DISTRIBUTION JOINT”
enclosed with the optional distribution joint kit (DDV
1912, DQV 1910).
(2) ●The T-joint (not provided) installation direction should
be either horizontal or vertical. The direction of the
connection port to each indoor must be slanted
slightly upward (15° to 30°) when the main tube is
horizontal and can be any direction but the branch
tube must be slightly upward when the tube is
vertical (L3 shows the length between the first T-joint and
the tube welded end (1 meter or less)).
●Make sure that the end point is solidly welded shut
and that the connection tube, inside the T-joint, doesn’t
block the refrigerant flow.
●Never diverge a branch tube again after the T-joint
(that is, there can only be 1 branch in a line)
WARNING
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
Pay a special attention to
the place, such as a
basement, etc. where
refrigerant can stay, since
refrigerant is heavier than
air.
CAUTION
6-4.Optional Distribution Joint Kits
●DDV 1912: Cooling capacity after distribution is 16.0 kW (54,600 BTU/h) or less
●DQV 1910: Cooling capacity after distribution is 16.0 kW (54,600 BTU/h) or less
Distribution Branch Size (ll 1, ll 2, ll 3, ll4)
Indoor unit type 9 type 12 type 18 type 25 type 36 type 48 type
Wide tube
Narrow tube
9.52 (3/8) *
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
NOTE
* In case of 25 type, use the “Tube connector” (accessory supplied with the indoor unit) for sizing up narrow tube from 6.35 to 9.52.
L3 1 m
<
–
Main tube
Outdoor
Solidly
welded shut
Indoor
Horizontal
Slant
15° to 30°
Indoor L3 ≤1m
Indoor
Indoor
Slant
15° to 30°
When in horizontal use When in vertical use
Solidly welded shut
Can be at
any angle
Indoor
Indoor
Outdoor
10
13.5
27.0
40.5
54.0
67.5
81.0
94.5
108
121.5
135
5
10
15
20
25
30
35
40
45
50
m
3
m
2
1169_M_I
20 30 40 kg
Min. indoor floor area (when the ceiling is 2,7 m high)
Range below the
density limit of
0,3 kg/m
3
(Contermeasures
not needed
Range above the
density limit of
0,3 kg/m
3
(Contermeasures
needed
Total amount of refrigerant
Min. indoor volume

EG
14
86
3/8"3/8"3/8"3/8"
3/8"
324
60100 60 60
0014_M_I
DDV 1912
ø19.05
ø12.7
83
185
GF E FGE
E
F
G
0016_M_I
ø12.7
ø6.35
DQV 1910
120
80
1/2"1/2"
3/4"
140 374 60 60 60
1/2"
5/8"
0013_M_
I
103
210
E
E
DED
D
CC
C
0015_M_I
Dimentions of connections (shows the inner diameter of tubing) Unit: mm
Position A B C D E F G
Size
ø28.58 ø25.4 ø 19.05 ø15.88 ø12.7 ø9.52 ø6.35
7-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring closely
following the wiring diagram.
(2) Provide a power outlet to be used exclusively for each
unit, and a power supply disconnect and circuit breaker
for overcurrent protection should be provided in the
exclusive line.
(3) To prevent possible hazards due to insulation failure, the
unit must be grounded.
(4) Each wiring connection must be done in accordance with
the wiring system diagram. Wrong wiring may cause the
unit to misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorised changes in the internal wiring can be very
dangerous. The manufacturer will accept no responsibility
for any damage or misoperation that occurs as a result of
such Unauthorised changes.
(7) Regulations on wire diameters differ from locality to locality.
For field wiring rules, please refer to your LOCAL
ELECTRICAL CODES before beginning.
You must insure that installation complies with all relevant
rules and regulations.
(8) To prevent malfunction of the air conditioner caused by
electrical noise, care must be taken when wiring as follows:
●The remote control wiring and the inter-unit control wiring
should be wired apart from the inter-unit power wiring.
●Use shielded wires for inter-unit control wiring between
units and ground the shielded on both sides.
(9) If the power supply cord of this appliance is damaged, it must
be replaced by a repair shop appointed by the manufacture,
because special purpose tools are required.
7-2. Recommended Wire Length and Wire Diameter for Power Supply System
AWG: American Wire Gauge
Outdoor Unit
(A) Power Supply Time Delay Fuse
4 mm2or Circuit Capacity Capacity Max. Wire Diameter
GRV250L7/R7 110 m 15 A 25 A
5.5 mm2(AWG#10)
GRV360L7/R7 75 m 20 A 25 A
5.5 mm2(AWG#10)
GRV480L7/R7 61 m 20 A 25 A
5.5 mm2(AWG#10)
GRV250L5/R5 20 m 35 A 50 A
14 mm2(AWG#10)
Type
Terminal Base
Indoor Unit
(A) Power Supply Time Delay Fuse
2.5 mm2or Circuit Capacity Capacity Max. Wire Diameter
245 m 15 A 50 A
14 mm2(AWG#6)
Terminal Base
7. ELECTRICAL WIRING (Only for PACKAGE Outdoor Units)
Wide tube Narrow tube
Max. diameter
Min. diameter
Insulation Insulation
Max. diameter
Min. diameter
Narrow tube
Wide tube

15
EG
Control wiring
(C) Inter-Unit Control Wiring (D) Remote Control Wiring (E) Control Wiring for Group Control
0.75 mm2(AWG#18) 0.75 mm2(AWG#18) 0.75 mm2(AWG#18)
Use Shielded Wiring
Max. 1000 m Max. 500 m Max. 500 m
NOTE
1) Refer to the Wiring System Diagrams (See next page) for
the meaning of “A”, “B”, “C”, “D”, “E” in the above tables.
2) Inter-Unit Control Wiring (c) has no polarity.
But for other wiring, respect polarity.
Be sure to connect as shown in the Wiring System Diagram.
3) The basic connection diagram of the indoor unit shows the
8P terminal board, so the terminal boards in your equipment
may differ from the diagram.
4) In accordance with conformity of EC Directive No.
89/336/EEC, when connecting power supply, it should be
considered guidance showing below.
* Do not share a common installation group with other
equipment.
* Be sure that supply network impedance is sufficiently low
(

ZSYS

RΩ). It may be necessary to consult the power
supply authority before connection of the air conditioner
to a low-voltage public network.
Models
R W Remarks
GRV 250 (3 phase) -Not necessary to consider supply network impedance
GRV 360 (3 phase) 0.192 Conforms to the loal code
GRV 480 (3 phase) 0.167 Ditto
GRV 250 (1 phase) 0.126 Ditto
7-3 Wiring System Diagrams
 twin type (two indoor units)
1
2
U1
U2
R1
R2
R3
1
2
3
1
2
3
1
2
4
L1
L2
L3
N
C
D
A
1
2
U1
U2
R1
R2
R3
0501_M_
I
L1
L2
L3
N
L
F
F
N
L
N
1
2
0
C
E
≥
7P terminal board
1(L)2(N)
Power
Supply
R1 R2 R3
Remote
Controller
U1 U2
Inter-unit
control wiring
Power supply
220 - 240 V ~50 Hz
RED
WHT
BLK
Remote controller
(option)
Inter-unit
control wiring
(Low voltage)
Ground
Indoor Unit Outdoor Unit
R.C. address on the PCB: 0 (S2, BLK)
0: Factory shipped state
Power supply
380 - 415 V - 3 N ~50 Hz
Inter-unit
control wiring
(Low voltage)
Power supply
220 - 240 V ~50 Hz
Ground
Ground
Ground
Indoor Unit

16
EG
Triple or Quartet type
●Address setting is executed automatically when the power supply is turned on.
C
1
2
U1
U2
R1
R2
R3
1
2
3
1
2
3
1
2
4
L1
L2
L3
N
D
A
1
2
U1
U2
R1
R2
R3
1
2
U1
U2
R1
R2
R3
0502_M_
I
L1
L2
L3
N
1
2
0
1
2
U1
U2
R1
R2
R3
L
N
L
N
L
N
L
N
C
C
E
E
E
Inter-unit
power wiring
(Line voltage)
Inter-unit
control wiring
(Low voltage)
RED
WHT
BLK
Remote controller
(option)
Indoor Unit Outdoor Unit
R.C. address on the PCB: 0 (S2, BLK)
0: Factory shipped state
Power supply
380 - 415 V - 3 N ~50 Hz
Indoor Unit
Indoor Unit
Inter-unit
power wiring
(Line voltage)
Inter-unit
power wiring
(Line voltage)
Ground
Ground
Ground
Ground
Ground
Inter-unit
power wiring
(Line voltage)

17
EG
(1) Basic wiring diagram for group control
This diagram shows when several units (max. 8) are
controlled by a wired controller. In this case, a
wired controller can be connected at any indoor unit.
NOTE
●R.C. Addresses should be set before turning the power on.
●Auto. address setting can be executed by the wired controller automatically.
Please refer to section 8 “PCB Setting”.
●Each successive unit will respond at one-second intervals following the order of the R.C. (S2) address when the remote
controller is operating.
Indoor Unit
Inter-unit
control wiring
(Low voltage)
Inter-unit
power wiring
(Line voltage)
Inter-unit
control wiring
(Low voltage)
Inter-unit
power wiring
(Line voltage)
Outdoor Unit
Indoor Unit Outdoor Unit
*1
R.C. Address on the PCB:
PCB: 1 (S2, BLK)
Power supply
380 - 415 V - 3 N ~50 Hz
R.C. Address on the PCB:
PCB: 2 (S2, BLK)
Power supply
380 - 415 V - 3 N ~50 Hz
Ground
Ground
Ground
Ground
Inter-unit
control wiring
(Low voltage)
Inter-unit
power wiring
(Line voltage)
Indoor Unit Outdoor Unit
R.C. Address on the PCB:
PCB: 8 (S2, BLK)
Power supply
380 - 415 V - 3 N ~50 Hz
Ground
Ground
Wired controller
(option)
RED
WHT
BLK
E
E

18
EG
(2) Basic wiring diagram for central control (link system)
This diagram shows when several units (max. 30 outdoor units
+ max. 64 indoor units) are controlled by a system controller
individually.
NOTE
●R.C. Addresses should be set before turning the power on.
1
2
U1
U2
R1
R2
R3
1
2
3
1
2
3
1
2
4
L1
L2
L3
N
B
D
1
2
3
1
2
3
D
1
2
3
1
2
3
D
A
0504_M_
I
L1
L2
L3
N
1
2
1
1
2
U1
U2
R1
R2
R3
1
2
4
L1
L2
L3
N
B
A
L1
L2
L3
N
1
2
2
1
2
U1
U2
R1
R2
R3
1
2
4
L1
L2
L3
N
B
A
L1
L2
L3
N
1
2
8
L1
D
L
N
N2
C1
C2
C3
C4
C
CC
C C
C
Inter-unit
power wiring
(Line voltage)
Inter-unit
power wiring
(Line voltage)
Inter-unit
control wiring
(Low voltage)
Inter-unit
control wiring
(Low voltage)
Inter-unit
control wiring
(Low voltage)
Inter-unit
control wiring
(Low voltage)
Indoor Unit
Indoor Unit
Indoor Unit Outdoor Unit
Outdoor Unit
Outdoor Unit
*1
R.C. Address on the PCB:
PCB: 1 (S2, BLK)
Power supply
380 - 415 V - 3 N ~50 Hz
Power supply
380 - 415 V - 3 N ~50 Hz
Power supply
380 - 415 V - 3 N ~50 Hz
R.C. Address on the PCB:
PCB: 8 (S2, BLK)
In case of 8 indoor units
R.C. Address on the PCB:
PCB: 2 (S2, BLK)
Ground
Ground
Ground
Ground
Ground
Ground
RED
WHT
BLK
Remote controller
(option)
RED
WHT
BLK
RED
WHT
BLK
Remote controller
(option)
Remote controller
(option)
Power supply
220 - 240 V ~50 Hz
Ground
System controller

19
EG
(3) Special cautions on wiring
Use shielded wires for inter-unit control wiring (c) and ground
the shielded on both sides.
All wiring except inter-unit control wiring (c) has polarity.
Otherwise misoperation due to noise may be generated at
times.
When linking outdoor units in a network (S-net link system),
remove the short plug (CN4, 2P Black, location: near CPU
on the outdoor control PCB) from all outdoor units except
one . Otherwise the communication of S-net link system
does not perform.
In case of no link system (No connection wiring between
outdoor units), do not remove the short plug.
Do not wire the inter-unit control wiring such as loop wiring
(Fig. below)
Outdoor unit Indoor unit Indoor unit Indoor unit
0824_M_I
Indoor unit Indoor unit Indoor unit
Outdoor unit
Indoor unit
NG
NG
Branch point
Outdoor unit Outdoor unit Outdoor unit
0192_M_
I
Prohibited
Prohibited
Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit
Do not install the inter-unit control wiring such as branch
wiring.
Star branch wiring causes mis-address setting.
If branching the inter-unit control wiring, the No. of branch
point should be 10 or less.
(The branch length less than 1 m does not include the branch
No.)
Outdoor unit Outdoor unit Outdoor unit
0193_M_
I
Indoor unit Indoor unit Indoor unit Indoor unit
Indoor unit
more than 1 m
more than 1 m
Branch
point
10 or less
Indoor unit
Indoor unit Indoor unit Indoor unit
less than 1 m
Indoor unit
CN4
Shielded wire