Technibel GRF244MR5IAA, GRF194MR5IAA, MCAF124MR5IAA, MCAF94MR5IAA, MCAF184MR5IAA Installation Instructions Manual

85264189906000

Model Combinations

Indoor Units

Outdoor Units

MCAF94MR5IAA GRF194MR5IAA
MCAF124MR5IAA GRF244MR5IAA
MCAF184MR5IAA

Combine indoor and outdoor units only as listed in
the combination tables for 2-room or 3-room out­door units as shown in their respective manuals.

Power Source:
50 Hz, single-phase, 220 – 240 V / 60 Hz, single-phase,
220 V

COOL/DRY/HEAT Model

Indoor unit B

Indoor unit A

Outdoor unit

Indoor unit C

Combination example

This air conditioner uses the new refrigerant R410A.

Contents

Page

IMPORTANT!

Please Read Before Starting .................................. 1

1. GENERAL.......................................................... 2

1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation

2. INSTALLATION SITE SELECTION ................... 3

2-1. Indoor Unit
2-2. Outdoor Unit
2-3. Outer Dimensions of Outdoor Unit
2-4. Diagram of Outdoor Unit Installation

3. INSTALLATION PROCESS ................................ 8

3-1. Embedding the Tubing and Wiring
3-2. Installing Outdoor Unit
3-3. Use of the Flaring Method
3-4. Flaring Procedure with a Flare Tool
3-5. Caution before Connecting Tubes Tightly
3-6. Tubing Connections
3-7. Insulation of Refrigerant Tubing
3-8. Taping the Tubes
3-9. Finishing the Installation
3-10. Refrigerant Operation System

4. AIR PURGING................................................... 12

■ Air Purging with a Vacuum Pump (for Test Run)

■ Pump Down

5. WIRING INSTRUCTIONS ................................ 15

5-1. General Precautions on Wiring
5-2. Recommended Wire Length and Diameter
5-3. Wiring System Diagram
5-4. Electric Wiring Diagram
5-5. How to Connect Wiring to the Terminal
5-6. Wiring Instructions for the Outdoor Unit

6. TEST RUN......................................................... 22

7. INSTALLATION CHECK SHEET ...................... 23

02/2004

INSTALLATION INSTRUCTIONS

- Multi Split system air conditioner -

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 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.

This symbol refers to a hazard
or unsafe practice which can
result in severe personal injury
or death.

This symbol refers to a hazard
or unsafe practice which can
result in personal injury or
product or property damage.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for
a special problem, contact our sales/service outlet or
your certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for
improper installation or maintenance service, including
failure to follow the instructions in this document.

SPECIAL PRECAUTIONS

When Wiring

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tub-

ing are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this

system. Carefully refer to the wiring diagram and
these instructions when wiring. Improper connections
and inadequate grounding can cause accidental

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.

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 Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.

…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.

…In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.

When Connecting Refrigerant Tubing

• 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 leak­free 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.

Others

• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.

• Confirm upon completing installation that no refriger­ant gas is leaking. If escaped gas comes in contact
with a stove, gas water heater, electric room heater or
other heat source, it can produce dangerously toxic
gas.

• Do not install only a single indoor unit.

WARNING

WARNING

CAUTION

CAUTION

2

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. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Carpenter’s 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)

16. Vacuum pump (For R410A)

17. Manifold valve

1-2. Accessories Supplied with Unit
Table 1

1-3. Optional Copper Tubing Kit

Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or A/C workshop.

1-4. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately
from a local source, you will need:

(1) Deoxidized annealed copper tube for refrigerant

tubing as detailed in Table 2.
Cut each tube to the appropriate lengths +30 cm

to 40 cm to dampen vibration between units.

Table 2

(2) Foamed polyethylene insulation for the specified

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 5. Wiring Instructions for details.

CAUTION

Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.

Model

Narrow Tube Wide Tube

Outer Dia. Thickness Outer Dia. Thickness

MCAF94MR5IAA 6.35 mm 0.8 mm 9.52 mm 0.8 mm
MCAF124MR5IAA 6.35 mm 0.8 mm 9.52 mm 0.8 mm
MCAF184MR5IAA 6.35 mm 0.8 mm 9.52 mm 0.8 mm

Parts Figure Q’ty

Labels for inter-unit A B (for GRF194MR5IAA) 4 each
cable and tube

A B C (for GRF244MR5IAA) 4 each

3

1-5. Additional Materials Required for Installation

(1) Refrigeration (armored) tape
(2) Insulated staples or clamps for connecting wire

(See local codes)
(3) Putty
(4) Refrigeration lubricant
(5) Clamps or saddles to secure refrigerant tubing

2. Installation Site Selection

2-1. Indoor Unit

AVOID:

● direct sunlight.

● nearby heat sources that may affect performance of the

unit.

● areas where leakage of flammable gas may be expected.

● places where large amounts of oil mist exist.

DO:

● select an appropriate position from which every corner of

the room can be uniformly cooled.

● select a location that will hold the weight of the unit.

● select a location where tubing and drain hose 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

(H1, H2, H3) above or below the outdoor unit and within
a total tubing length (L1+L2, L1+L2+L3) from the outdoor
unit as detailed in Table 3 and Fig. 1.

Table 3

INDOOR
UNIT (1)

INDOOR
UNIT (3)

INDOOR
UNIT (2)

Tubing length (L1)

L2

L3

Elevation
difference (H1)

H2

H3

OUTDOOR
UNIT

Fig. 1

WARNING

To prevent abnormal heat genera­tion and the possibility of fire, do
not place obstacles, enclosures
and grilles in front of or sur­rounding the air conditioner in a
way that may block air flow.

Max. Allowable Tubing Limit of Total Tubing Limit of Elevation

Model Length per unit Length (L1+L2) or Difference (H1, H2, H3)

(m) (L1+L2+L3) (m) (m)

GRF194MR5IAA 25 * 35 (L1+L2) 10
GRF244MR5IAA 25 * 50 (L1+L2+L3) 10

This outdoor unit requires no refrigerant charge up to the maximum limit for total tubing
length of 35 m (GRF194MR5IAA) or 50 m (GRF244MR5IAA).
Therefore, no refrigerant needs to be added on-site.

NOTE

Fig. 2a

4

(1) Connecting indoor unit types (94 – 124) at B

φ6.35

φ6.35

φ9.52

φ9.52

A

B

(94 – 124 type)

Outdoor unit

Indoor unit

(94 – 124 type)

(2) Connecting indoor unit type 184 at B (Length of tube: more than 17 m)

φ6.35

φ6.35

φ9.52

Union φ12.7

φ9.52

φ9.52

A

B

(94 – 124 types)

Outdoor unit

Indoor unit

(184 type)

Flare φ9.52

Union φ12.7

φ12.7

Flare φ9.52

A joint for connecting tubes of
different sizes

(More than 17 m)

Fig. 2b

(3) Connecting indoor unit type 184 at B (Length of tube: less than 17 m)

φ6.35

φ6.35

φ9.52

φ9.52

A

B

(94 – 124 types)

Outdoor unit

Indoor unit

(184 type)

φ9.52

φ9.52

(Less than 17 m)

Fig. 2c

GRF194MR5IAA

5

Fig. 2e

Fig. 2f

φ6.35

φ6.35

φ6.35

φ9.52

φ9.52

Union φ12.7

φ9.52

φ9.52

φ9.52

A

B

C

(94 – 124 types)

Outdoor unit

Indoor unit

(94 – 124 types)

(184 type)

Flare φ9.52

Union φ12.7

φ12.7

Flare φ9.52

A joint for connecting tubes of
different sizes

(More than 17 m)

φ6.35

φ6.35

φ9.52

φ9.52

φ9.52

φ6.35

φ9.52

A

φ9.52

B

φ9.52

C

(94 – 124 types)

Outdoor unit

Indoor unit

(94 – 124 types)

(184 type)

(Less than 17 m)

φ6.35

φ6.35

φ9.52

φ9.52

φ9.52

φ6.35

φ9.52

A

φ9.52

B

φ9.52

C

(94 – 124 type)

Outdoor unit

Indoor unit

(94 – 124 type)

(94 – 124 type)

GRF244MR5IAA

(1) Connecting indoor unit types (94 – 124) at C

(2) Connecting indoor unit type 184 at C (Length of tube: more than 17 m)

(3) Connecting indoor unit type 184 at C (Length of tube: less than 17 m)

Fig. 2d

Note: It is not possible to connect the indoor unit type 244 to 2 or 3 room outdoor unit.

6

2-2. Outdoor Unit
AVOID:

● heat sources, exhaust fans, etc. (Fig. 3)

● damp, humid or uneven locations.

DO:

● choose a place as cool as possible.

● choose a place that is well ventilated.

● allow enough room around the unit for air intake/

exhaust and possible maintenance. (Fig. 4a)

● provide a solid base (level concrete pad, concrete

block, 15 × 40 cm beams or equal), a minimum of
15 cm above ground level to reduce humidity and
protect the unit against possible water damage and
decreased service life. (Fig. 4a)

● install cushion rubber under unit’s feet to reduce

vibration and noise. (Fig. 4b)

● use lug bolts or equal to bolt down unit, reducing

vibration and noise.

● select a location where the operating noise and air

blowing from the outdoor unit will not disturb neigh­bors.

● select a location where the clearance indicated by

⇔ in the installation diagram is ensured for the
front, rear, left, and right of the main unit.

● install so that the unit is level.

● select a location that can fully support the weight of

the outdoor unit, and that will not magnify operating
noise or vibration.
(Fasten in place with the anchor bolts (M10).)

● provide a base using concrete or similar material,

and ensure proper drainage.

● select a location where there is no danger of

flammable gas leakage.

● in snowy or rainy regions, be sure to construct a

roof to keep off the snow and rain, and inhibit freez­ing and condensation.

● select a location that is at least 3 meters away from

any antennas used for television, radio transceiver,
or other equipment.

● for purposes of future service and repair, select a

location where the inspection panel can be removed.

● select a location where the drain port will not be

obstructed.

Outdoor unit

Hot air

Heat source

Exhaust fan

NO

Fig. 3

Fig. 4a

Cushion rubber

Fig. 4b

Air intake Min. 20 cm

Air discharge

Min.

10 cm

Min.
50 cm

Valve
side
Min.
25 cm

2 m

2 m

Min. 20 cm
Air intake

Ground

Obstacle

Obstacle above

Air discharge

Air intake

Concrete
or equal

About 15 cm

Min. 15 cm

Anchor bolts
(4 pcs.)

About 40 cm

Install the inter-unit cable more than 1 meter away
from any antenna or power lines or connecting wires
used for television, radio, telephone, security system,
or intercom. Electrical noise from any of these
sources may affect operation.

7

2-3. Outer Dimensions of

Outdoor Unit

2-4.

Diagram of Outdoor Unit Installation

Base (not provided)
(concrete or similar
material)

Fastened with anchor
bolts (not provided)
(M10, 4 locations)

Tubing
panel

B

A

C

Indoor unit A

Indoor unit B

Indoor unit C

Cable fastener

Ground wire
(not provided)

Over 250

Power breaker

Over 200

Inspection panel

Over 10

Over 500

Ensure 150 mm
of space if a
drain hose is to
be used.

Service space

Be sure to connect indoor and outdoor units only
in combinations that are listed in the catalog or in
the combination table that was provided with the
outdoor unit.
(Use caution. Connecting any other model may
result in operation failure and malfunction.)

The dimensions indicated by ⇔ in the figure
below are spaces that are required in order to
maintain performance. Install in a location where
the dimensions indicated by ⇔ are ensured, and
where 2 or more faces of the unit are
unobstructed. In principle, the top direction should
be unobstructed.

Cover

Tubing panel

Two indoor units (Type 3)

(1) Place covers over positions that tubes

do not pass through, as necessary
according to the number of indoor units.

(2) Adjust the tube positions and attach the

tubing panel.

Three indoor units (no covers used.)

Using the tubing panel and covers

940

13 13

13 13

1015

380

405

660

110

340

730

18

166

86

166

246

86

GRF194MR5IAA model

Service valve on
narrow tube side

Service valve on
wide tube side

(Outer diameter φ6.35)

Service valve on
narrow tube side

(Outer diameter φ6.35)

(Outer diameter φ9.52)

Service valve on
wide tube side

(Outer diameter φ9.52)

GRF244MR5IAA model

Fig. 5

Fig. 6

Never install only a single indoor unit.

Unit: mm

8

3. Installation Process

3-1. Embedding the Tubing and Wiring

● Do not connect tubes to locations that are embedded.

● Be sure to bind refrigerant tubing and inter-unit

cables together with vinyl tape.

● The power cable must be obtained on-site.

(φ2.0: Less than 15 m / φ2.6: Less than 20 m /
φ3.5: Less than 26 m)

● Be sure to apply the provided labels to both ends of

the inter-unit cables to prevent miswiring.

● Securely seal the end of embedded tubing with vinyl

tape in order to prevent dirt or moisture entry.

● In order to prevent insulation breakdown and

ground faults, do not allow the wire ends to contact
rainwater, or be subject to dew condensation.

3-2.

Installing Outdoor Unit

(1) Select a location for installing the outdoor unit.

(Refer to 2-2. Outdoor Unit.)

(2) The connection valves are stored inside the unit.

Remove the inspection panel and remove the
cable fasteners. (To remove the inspection panel,
remove the 3 screws, then push the panel down
and pull it toward you.)
(Refer to 2-4. Diagram of Outdoor Unit Installation.)

(3) Remove the tubing panel in order to attach covers

as needed, according to the number of indoor units.
(Refer to 2-4. Diagram of Outdoor Unit Installation.)

Narrow Tube Wide Tube

φ

6.35 mm (1/4")

φ

9.52 mm (3/8")

Be sure to prepare special R410A-type tubes (wall thickness

0.8 mm) as shown in the table at right.

Deburring

Before

After

Fig. 7

3-3. Use of the Flaring Method

Many conventional split system air conditioners employ the
flaring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the copper
tubes are flared at each end and connected with flare nuts.

3-4. Flaring Procedure with a Flare Tool

● For creating the flare, use the special R410 flare tool. The

previous (R22) flare tool may also be used. (Fig. 9)

(1) Cut the copper tube to the required length with a tube

cutter. It is recommended to cut approx. 30 – 50 cm
longer than the tubing length you estimate.

(2) Remove burrs at the end of the copper tube with a tube

reamer or file. This process is important and should be
done carefully to make a good flare. (Fig. 7)

Table 4

9

Service valve on
narrow tube side

Service valve on
wide tube side

Apply the provided labels to the indoor
and outdoor unit tubing connectors to
prevent errors in connections.

B

A

C

Reamer

Copper
tubing

Fig. 8

Fig. 9

Flare tool

Flare nut

Copper
tubing

Fig. 10

Fig. 13

Apply refrigerant
lubricant here and here

Fig. 11

Flare nut

Union

Fig. 12

When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 8)

(3) Remove the flare nut from the unit and be sure to

mount it on the copper tube.

(4) Make a flare at the end of copper tube with a flare

tool.* (Fig. 10)
(*Use “RIGID” or equivalent.)

A good flare should have the following characteristics:

● inside surface is glossy and smooth.

● edge is smooth.

● tapered sides are of uniform length.

3-5. Caution before Connecting Tubes Tightly

a) Be sure to apply a sealing cap or water-proof tape

to prevent dust or water from getting into the
tubes before they are used.

b) Be sure to apply refrigerant lubricant to the

matching surfaces of the flare and union before
connecting them together. This is effective for
reducing gas leaks. (Fig. 11)

c) For proper connection, align the union tube and flare

tube straight with each other, then screw in the flare
nut lightly at first to obtain a smooth match. (Fig. 12)

3-6. Tubing Connections

a) Temporary connection:

Screw in 3 – 5 rotations by hand. (Fig.13)

b) To fasten the flare nuts, apply specified torque as:

Table 5

NOTE

NOTE

0 0.5 mm

If the special R410A
flare tool is used:

1.2 mm

If the previous flare tool
(clutch-type) is used:

Adjust so that the amount of tube
protrusion is as shown in the figure.

Tube Dia. Tightening Torque

6.35 mm 18 N·m (180 kgf·cm)

9.52 mm 42 N·m (420 kgf·cm)

12.70 mm 55 N·m (550 kgf·cm)

10

Insulation

3-7. Insulation of Refrigerant Tubing

To prevent heat loss and wet floors due to dripping of
condensation, both tubes must be well insulated
with a proper insulation material. The thickness of
the insulation should be a minimum 8 mm. (Fig. 16)

3-8. Taping the Tubes

(1) At this time, the 2 refrigerant tubes (and electrical

wire if local codes permit) should be taped togeth­er with armoring tape. The drain hose may also be
included and taped together as 1 bundle with the
tubing.

(2) Wrap the armoring tape from the bottom of the

outdoor unit to the top of the tubing where it
enters the wall. As you wrap the tubing, overlap
half of each previous tape turn. (Fig. 17a)

(3) Clamp the tubing bundle to the wall, using 1 clamp

approx. every 120 cm.

Do not wind the armoring tape too tightly since this will
decrease the heat insulation effect. Also be sure the
condensation drain hose splits away from the bundle
and drips clear of the unit and the tubing.

3-9. Finishing the Installation

After finishing insulating and taping over the tubing,
use sealing putty to seal off the hole in the wall to pre­vent rain and draft from entering. (Fig. 17b)

NOTE

IMPORTANT

Indoor unit

Outdoor unit

Spanner

Torque wrench

Fig. 14

Fig. 15

Insulation

Min.
8 mm

Thickness:
min. 8 mm

Fig. 16

Fig. 17a

Clamp

Insulated tubes

Apply putty here

Tubing

Fig. 17b

CAUTION

After a tube has been insulated,
never try to bend it into a narrow
curve, as this may cause the
tube to break or crack.

CAUTION

Be sure to match refrigerant
tubing and electric wiring
between indoor and outdoor
units. For more details, refer to
“Tubing Check Control” in the
Technical & Service Manual.

11

3-10. Refrigerant Operation System

When the air conditioner is turned ON, the compressor starts to work. The compressor absorbs low-temperature and
low-pressure refrigerant from the evaporator; the refrigerant is then compressed into high-temperature and high­pressure refrigerant gas and goes into the condenser (COMPRESSION). This high-temperature and high-pressure
refrigerant gas is condensed into liquid refrigerant; during the CONDENSING process, heat is released to the out­doors through the condenser.
High-pressure and high-temperature liquid refrigerant goes into the capillary tube to reduce the pressure and to
lower the temperature (PRESSURE REDUCTION). The low-pressure liquid refrigerant passed through the capillary
tube is sent to the evaporator for evaporation. In this EVAPORATION process, heat in the room is absorbed. This
cycle is repeated until the room temperature is lowered to the target level.
During the heating cycle, the direction of refrigerant flow is reversed by a 4-way valve. As a result, the condenser
draws heat from the outdoor air and the evaporator supplies hot air to the room.

Indoor unit

Service valve
on wide tube
side

Service
valve on
narrow tube

Compressor

Strainer

Muffler

Muffler

Sub­accumulator

Four-way valve

When cooling
When heating
When defrosting

Outdoor
heat
exchanger

Solenoid valve
for hot gas bypass

Electric expansion
valve

Electric
expansion
valve

Modulator

Main
accumulator

Fig. 18

When cooling
When heating
When defrosting

Outdoor
heat
exchanger

Solenoid valve
for hot gas bypass

Electric expansion
valve

Electric
expansion
valve

Main
accumulator

Compressor

Muffler

Muffler

Sub­accumulator

Four-way valve

Service valve on
wide tube side

Service
valve on
narrow tube

Strainer

Modulator

Indoor unit

Fig. 19

Unit: mm

Unit: mm

3-Room Multi Refrigerant Tubing System Diagram

2-Room Multi Refrigerant Tubing System Diagram

12

4. Air Purging

Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below. There­fore, they must be purged completely.

● pressure in the system rises

● operating current rises

● cooling efficiency drops

● moisture in the air may freeze and block capillary

tubing

● water may lead to corrosion of parts in the refriger-

ant system

■

Air Purging with a Vacuum Pump
(for Test Run)

● In order to protect the earth’s environment, be sure to

use a vacuum pump to perform the air purge.
(Never perform an air purge by using the refrigerant
gas cylinder or other external gas, or by using the gas
inside the outdoor unit.)

For GRF194MR5IAA, perform the air purge for tubes A
and B. For GRF244MR5IAA, perform the air purge for
tubes A, B, and C. Use the same procedures for all
tubes.

(1) Check that each tube (both narrow and wide

tubes) between the indoor and outdoor units have
been properly connected and all wiring for the test
run has been completed. Note that both narrow
and wide tube service valves on the outdoor unit
are kept closed at this stage.

(2) Using an adjustable wrench or box wrench,

remove the valve caps from the service valve on
both narrow and wide tubes.

(3) Connect a vacuum pump and a manifold valve

(with pressure gauges) to the service port on the

HiLo

B

A

C

Service valve
on narrow
tube side

Service
valve on
wide tube
side

With push-pin

Hex wrench
(nominal size 4 mm, not provided)

Manifold gauge
(special for R410A)

Low­pressure
valve

Open

Charging hose
(special for R410A)

Leave the
valve open.

Vacuum pump
adapter
(for preventing
reverse flow)
(special for
R410A)

Vacuum
pump

High-pressure valve

Fig. 20

Cap tightening torque:
20 25 N-m
(200 250 kgf-cm)
(Tighten by hand, then
use a wrench to turn.)

Stopper

Spindle

Screw diameter: 1/2
UNF 20 threads

Valve core

Cap nut tightening torque:
7 11 N-m
(70 110 kgf-cm)
(Tighten by hand, then use a
wrench to turn approximately 30 .)

<Structure of service valve on wide tube side>

Fig. 21

CAUTION

Be sure to use a manifold valve for
air purging. If it is not available,
use a stop valve for this purpose.
The “Hi” knob of the manifold
valve must always be kept closed.

CAUTION

CAUTION

Before using the vacuum pump
adapter, read the vacuum pump
adapter manual, and use the
adapter correctly.

In order to prevent charging errors with
A/C that uses R410A, the screw diameter
at the service valve charging port has
been changed. When recharging or per­forming other servicing, use the special
charging hose and manifold gauge.

● When using a hex wrench to open the spindle, an

extremely small amount of refrigerant may leak.
This does not indicate a problem.

● Use a hex wrench of a type to which force can be

easily applied.

13

(4) With the “Lo” knob of the manifold valve open, run

the vacuum pump. Run the pump until the pres­sure is –101 kPa (–76 cmHg). The operation time
for the vacuum pump varies with tubing length
and the capacity of the pump. The following table
shows the amount of time required for evacuation:

Table 6

The required time in the above table is calculated
based on the assumption that the ideal (or target) vac­uum condition is around 10 mmHg abs.

(5) With the vacuum pump still running, close the “Lo”

knob of the manifold valve. Then stop the vacuum
pump. Fully close the low-pressure valve and stop
the vacuum pump. (Wait 1 – 2 minutes and check
that the manifold gauge pointer does not return. If
it does return, find and repair the leak, then apply
the vacuum again.)

(6) With a hex wrench, turn the valve stem on the nar-

row tube service valve counter-clockwise by 90
degrees (1/4 turn) for 10 seconds, and then turn
the stem clockwise to close it again.

(7) With a standard screwdriver, turn the wide tube

service valve stem counterclockwise to fully open
the valve.

(8) Turn the narrow tube service valve stem counter-

clockwise to fully open the valve.

(9) Loosen the vacuum hose connected to the wide

tube service port slightly to release the pressure.
Then, remove the hose.

(10) Leak test all joints at the tubing (both indoor and

outdoors) with liquid soap. Bubbles indicate a leak.
Be sure to wipe off the soap with a clean cloth.

NOTE

CAUTION

Be sure to completely insert
the hex wrench before
attempting to turn the valve.

Required time for evacuation when capacity

of 100 liter/h vacuum pump is used

20 min. or more

CAUTION

If a CFC gas detector is
used, use a special detec­tor for HFC refrigerant
(such as R410 and R134a).

14

(11) Replace the flare nut on the wide tube service

port and fasten the flare nut securely with an
adjustable wrench or box wrench. Next, mount
the valve cap and tighten it with a torque wrench
(the cap needs to be tightened with the torque of
200 kg-cm). This process is very important to pre-

vent gas from leaking from the system.
(12) Test run the air conditioner. (See page 22.)
(13) While the air conditioner is running, apply liquid

soap to check for any gas leaks around the ser-

vice valves or caps.
(14) If there is no leakage, stop the air conditioner.
(15) Wipe off the soap on the tubing.
This completes air purging with a vacuum pump and

the air conditioner is ready for actual operation.

■

Pump Down

● When relocating or disposing of the A/C, request

this service from the dealer where the unit was pur­chased, or from an appropriate agent. Perform
pump-down as described below.

What is pump-down?

● Pump-down refers to recovering the refrigerant gas

from the refrigerant cycle at the outdoor unit. This
work must be performed during cooling operation.
The refrigerant gas cannot be recovered during
heating operation.

● During winter, or if the temperature sensor prevents

cooling operation, perform “forced cooling operation.”

Pump-down procedure

(For model GRF194MR5IAA, there is no tube C.)
(1) Fully close the spindles at the valves on the narrow

tube side of tubes A, B, and C. (Refer to Fig. 23.)

(2) Connect the manifold gauge to the charging port at

the valve on the wide tube side of tube C. Purge
the air from the charging hose. (Refer to Fig. 24.)

In order to protect the earth’s environment, be sure to perform pump-down to recover refrigerant

gas without releasing it into the atmosphere.

Forced cooling operation

(The following explanation uses a wall-mounted unit
as the example. Refer to each indoor unit’s Installation
Instruction for details)

1. Turn the operation knob to
the ON position.

2. Use the remote control to
start cooling operation.

3. Turn the operation knob
from the ON position to the
TEST RUN position.

* The operation knob differs to

some degree depending on
the model.

Narrow tube side

Charging port

Close

Close

Close

A

B

C

Fig. 23

Fig. 22

15

(3) Perform cooling operation or forced cooling

operation.
When the pressure at the low-pressure side is

0.15 – 0.2 MPa (0.5 – 1 kg/cm2G), fully close the
spindles at the valves on the wide tube side of
tubes A, B, and C, and immediately stop opera­tion. (Refer to Fig. 24.)
In the winter, the outdoor unit may stop after 5 ­10 minutes of operation. This is in order to protect
the indoor unit heat exchanger from freezing and
does not indicate a problem.

(4) Disconnect the manifold gauge and the inter-unit

tubes, and attach the caps and flare nuts. At this
point, pump-down is completed. (If the caps and
flare nuts are not reattached, there is the danger
of gas leakage.) (Refer to Fig. 25.)

If pump-down is not possible

If the A/C cannot be operated because of a malfunc­tion or other cause, use a refrigerant recovery device
to recover the refrigerant.

5. Wiring Instructions

5-1. 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, with a power supply disconnect and cir­cuit breaker for overcurrent protection provided in
the exclusive line.

(3) To prevent possible hazard due to insulation fail-

ure, the unit must be grounded.

(4) Each wiring connection must be done tightly and 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) Unauthorized 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 unauthorized
changes.

Manifold gauge

Wide tube side

Cap

Cap

Cap

After disconnecting
the inter-unit tubes,
attach the flare nuts
with flare bonnets.

Fig. 24

Fig. 25

16

5-2. Recommended Wire Length and Diameter

Regulations on wiring diameter differ from locality to locality.
For field wiring requirements, please refer to your local elec­trical codes. Carefully observe these regulations when carry­ing out the installation.
Table 7 shows maximum wire lengths for control line and
power line and fuse or circuit capacity.

Refer to the wiring system diagram (Fig. 26a and b) for the
meaning of “A” and “B” in Table 7.

Table 7

NOTE

Cross-sectional Max. Control Line Length Max. Power Line Length Fuse

Area (mm2) (A) (B) or

Model 1.0 2.0 2.6 3.5

Circuit Capacity

GRF194/244MR5IAA 34 m 15 m 20 m 26 m 20 A

Indoor Unit

Outdoor Unit

Unit A

Unit A

Unit B

Unit B

(A)

Terminal plate (8P)

Terminal plate (3P)

Grounding line
Power supply
Single-phase

AC 220 – 240 V

(B)

CAUTION

Be sure to connect the
power supply line to the
outdoor unit as shown in
the wiring diagram. The
indoor unit draws its power
from the outdoor unit.

5-3. Wiring System Diagram

WARNING

● Be sure to comply with local codes on running

the wire from the indoor unit to the outdoor unit
(size of wire and wiring method, etc.).

● Each wire must be firmly connected.

● No wire should be allowed to touch refrigerant

tubing, the compressor, or any moving part.

● Be sure to connect power wires correctly match-

ing up numbers on terminals of the outdoor unit
and respective indoor units A – C.

To avoid the risk of electric
shock, each air conditioner
unit must be grounded.

WARNING

Fig. 26a Fig. 26b

Indoor Unit

Outdoor Unit

Unit A

Unit A

Unit B

Unit C

Unit B

Unit C

(A)

Terminal plate (12P)

Terminal plate (3P)

Grounding line
Power supply
Single-phase AC 220 – 240 V

(B)

2 indoor units with GRF194MR5IAA

3 indoor units with GRF244MR5IAA

17

5-4. Electric Wiring Diagram

BK

W

R

GRN
/Y

BK

BK
BK

BK

W

BK (ORG)
BK (ORG)

GY
GY
GY
GY
GY
GY

W(BK)
GY
GY

GY
GY

R
W
BL

Control panel

Inter-unit cables

Terminal board

Display/
receiver
panel

(GRN)

Fan motor

Flap motor

To
heat exchanger

(W)

(W)

(W)

(W)

(GRN)

(R)

(W)

(W)

Room temperature
sensor

Heat exchanger
temperature sensor

Humidity sensor

BK

BK: Black
W: White
R: Red
GRN: Green
Y: Yellow
BL: Blue
GY: Gray

Fig. 27a

INDOOR UNIT

BK

BK

Control panel

Terminal board

Display/
receiver
panel

(GRN)

Fan motor

Flap motor

(W)

(W)

(W)

(W)

(GRN)

(R)

(W)

(W)

BK: Black
W: White
R: Red
GRN: Green
Y: Yellow
BL: Blue
GY: Gray

Inter-unit cables

To
heat exchanger

Room temperature
sensor

Heat exchanger
temperature sensor

GRN
/Y

BK

W
R

BK

BK
BK

BK

R
W
BL

W(BK)
GY
GY
GY
GY

BK

W
GY
GY
GY
GY
GY
GY

Humidity sensor

Fig. 27b

MCAF94MR5IAA

MCAF124/184MR5IAA

18

CAUTION

Fig. 28a

Electric Wiring Diagram for 2-room-multi outdoor unit (GRF194MR5IAA)

Before replacing PCBs, turn off the power and check that all
lamps on the PCB are off before starting work. Electric shock
will occur if work is performed while the lamps are lit.

Electric Shock

YEL

YEL

BLU

BLK

WHT

BLU

BLK
BLK
BLK

BLK

BLK
BLK

BLK

YEL
YEL

WHT

BLK
BLK
BLK
BLK
BLK

BLK

BLK
BLK

BLK

YEL

PNK

(

RED

)

WHT

WHT

RED

BLK

WHT

BLK

BLK

WHT

CH

CRANKCASE HEATER

FERRITE CORE

FC1,2

31

HEATER

(

YEL

)

CN02

CH

WHT

WHT

RE1

RE2RE1

++

U

GRN

/

YEL

WHT

BLU

CM

EARTH

240V

AC220V

1

12 4

UNIT B

INDOOR

421

GRN

/

YEL

BLK

GRN

/

YEL

WHT

GRN

/

YEL

TERMINAL

BASE

(

8P

)

12

321321

OPERATION CONDENSERC0TRANSISTOR

TR

DIODE

BRIDGE DIODE

BD

D

TH7

MVA,MVB

MECHANICAL VALVE

TH6

THERMISTOR(ROOM B NARROW PIPE)

THERMISTOR(ROOM B WIDE PIPE)

RED

CONTROL PCB

VW

UNIT A

INDOOR

RE2

HIC+

W

W

HIC

-

YEL

GRY

+

+

HIC+HIC

-

2

21

1

(

WHT

)

4

43

3

CN34

HIC1

HIC1

(

WHT

)

6

65

57

7

CN01

8

8

9

9

10

10

2

21

1

(

WHT

)

5

54

4

CN30

HIC2

HIC2

(

WHT

)

8

87

7

10

10

CN02

11

11

(

WHT

)

CN18

HIC3

HIC3

(

WHT

)

CN03

BLK

1

1

BLK

2

2

FILTER PCB

HS

ORG

79

CN35

(

WHT

)

3
1

5

SI

BRN

TERMINAL BASE

(

3P

)

6

67

7

WHT

BLK

(

WHT

)

PAM

PAM

CN23

4

45

5

WHT

BLK

(

WHT

)

1

12

2

BLK

BLK

(

WHT

)

CT

CT

(

WHT

)

CN08

1

13

3

BLK

BLK

(

WHT

)

PRY

PRY

(

RED

)

CN21

WW

AC200-L2

CN29

BLK

YEL
YEL

BLK

YEL
YEL

YEL

TH7
TH6

(

RED

)

YEL

432

1

BTH

CN22

TH5
TH4

TH2
TH1

(

BLK

)

DEF

BLU

CN05

BLU

3
1

DEF

WHT

ORG

BLU

BRN

YEL

RED

RED

BLU
ORG

WHT

YEL

BRN

BD

C0

(BLK)(

WHT

)(

BLK

)

(

WHT

)

(

WHT

)(

WHT

)

(

RED

)

3

GRY

+

MC01 MC02

ORG

GRY

6

TH3

1

BLK

WHT

L2L1

WW

G2

TR

D

HIC PCB

YEL

BLU

BRN

YEL

RED

WHT

YEL

+

5432

1

CN37

MVA

MVA

6

(

BLK

)(

RED

)

GRN

/

YEL

GRN

/

YEL

FC1

FC2

GRN

/

YEL

W

WHT

RV

6 4

FMO

MMV

32
1

ATH

CN24

MVB

BRN

GRY

BLK

FMOTH

CN16

FMO

CN09

CN06

RV

MMV

CN36 CN13 CN19

COIL

/

GAIKI

COMP

1

3

1

573

1

2345

1

3

1

234

1

2

W

G1

GRY

WHT

W

DC280

(

WHT

)

3
1

CN01

5

AC200-L1

DC280

-

AC200

W

DC280+

BLK

1

12

2

MVB

CN38

1

2345

SOLDERED TERMINAL

TERMINAL

TERMINAL BASE

CONNECTOR

REACTOR

THERMISTOR(ROOM A WIDE PIPE)

THERMISTOR(ROOM A NARROW PIPE)

THERMISTOR(COMPRESSOR TEMP)

THERMISTOR(OUTDOOR TEMP)

THERMISTOR(HEAT EXCHANGER)

W

BOARD-IN-WIRE

HEAT SINK

DEF

MAIN MOTOR OPERATED VALVE

4-WAY VALVE

FAN MOTOR

COMPRESSOR MOTOR

HS

RE1,2

TH5

TH4

TH3

TH2

TH1

DEFROST VALVE

MMV

RV

FMO

CM

DESCRIPTIONSYMBOLS

854

-

2

-

5269

-

183

-

00

-

2

ELECTRIC WIRING DIAGRAM

MULTIPLE INDOOR UNITS

HEAT-PUMP OUTDOOR UNIT FOR TWO-ROOM

19

Fig. 28b

CAUTION

Before replacing PCBs, turn off the power and check that all
lamps on the PCB are off before starting work. Electric shock
will occur if work is performed while the lamps are lit.

Electric Shock

Electric Wiring Diagram for 3-room-multi outdoor unit (GRF244MR5IAA)

WHT

YEL

YEL

BLU

BLK

WHT

BLU

BLK
BLK
BLK

BLK

BLK
BLK

BLK

YEL
YEL

WHT

BLK
BLK
BLK
BLK
BLK

BLK

BLK
BLK

BLK

YEL

PNK

(

RED

)

WHT
BLU

WHT

RED

BLK

WHT

BLK

BLK

WHT

CH

CRANKCASE HEATER

FERRITE CORE

FC1,2

31

HEATER

(

YEL

)

CN02

CH

WHT

WHT

RE1

RE2RE1

TH8

THERMISTOR(ROOM C NARROW PIPE)

THERMISTOR(ROOM C WIDE PIPE)

TH9

++

U

GRN

/

YEL

WHT

BLU

CM

EARTH

240V

AC220V

1

12 4

UNIT C

INDOOR

12 4

UNIT B

INDOOR

421

GRN

/

YEL

BLK

GRN

/

YEL

WHT

BLK

GRN

/

YEL

GRN/YEL

TERMINAL

BASE

(

12P

)

12

321321321

OPERATION CONDENSERC0TRANSISTOR

TR

DIODE

BRIDGE DIODE

BD

D

TH7

MVA MVC

MECHANICAL VALVE

TH6

THERMISTOR(ROOM B NARROW PIPE)

THERMISTOR(ROOM B WIDE PIPE)

RED

CONTROL PCB

VW

UNIT A

INDOOR

RE2

HIC+

W

W

HIC

-

YEL

GRY

+

+

HIC+

HIC

-

2

21

1

(

WHT

)

4

43

3

CN34

HIC1

HIC1

(

WHT

)

6

65

57

7

CN01

8

8

9

9

10

10

2

21

1

(

WHT

)

5

54

4

CN30

HIC2

HIC2

(

WHT

)

8

87

7

10

10

CN02

11

11

(

WHT

)

CN18

HIC3

HIC3

(

WHT

)

CN03

BLK

1

1

BLK

2

2

FILTER PCB

HS

ORG

79

CN35

(

WHT

)

3

1

5

SI

BRN

TERMINAL BASE

(

3P

)

6

67

7

WHT

BLK

(

WHT

)

PAM

PAM

CN23

4

45

5

WHT

BLK

(

WHT

)

1

12

2

BLK

BLK

(

WHT

)

CT

CT

(

WHT

)

CN08

1

13

3

BLK

BLK

(

WHT

)

PRY

PRY

(

RED

)

CN21

WW

AC200-L2

CN29

BLK

YEL
YEL

BLK

TH9
TH8

(

BLU

)

YEL

YEL

432

1

CTH

CN20

TH7
TH6

(

RED

)

YEL
YEL

432

1

BTH

CN22

TH5
TH4

TH2
TH1

(

BLK

)

DEF

BLU

CN05

BLU

3
1

DEF

WHT

ORG

BLU

BRN

YEL

RED

(

BLU

)

6

RED

BLU
ORG

WHT

YEL

BRN

MVC

MVC

CN39

1

BD

C0

(

BLK

)(

WHT

)(

BLK

)

(

WHT

)

(

WHT

)(

WHT

)

(

RED

)

3

GRY

+

MC01 MC02

ORG

GRY

6

TH3

1

BLK

WHT

L2L1

WW

G2

TR

D

HIC PCB

YEL

BLU

BRN

YEL

YEL

RED

WHT

YEL

YEL

+

5432

1

CN37

MVA

MVA

6

(

BLK

)(

RED

)

BRN

GRN

/

YEL

GRN

/

YEL

FC1

FC2

GRN

/

YEL

W

WHT

RV

6

ORG

RED

4

FMO

MMV

32
1

YEL

ATH

CN24

BLU

WHT

MVB

BRN

GRY

BLK

FMOTH

CN16

FMO

CN09

CN06

RV

MMV

CN36 CN13 CN19

COIL

/

GAIKI

COMP

1

3

1

573

1

2345

1

3

1

234

1

2

W

G1

GRY

WHT

W

DC280

(

WHT

)

3

1

CN01

5

AC200-L1

DC280

-

AC200

W

DC280+

BLK

1

12

2

MVB

CN38

1

2345 5432

SOLDERED TERMINAL

TERMINAL

TERMINAL BASE

CONNECTOR

REACTOR

THERMISTOR(ROOM A WIDE PIPE)

THERMISTOR(ROOM A NARROW PIPE)

THERMISTOR(COMPRESSOR TEMP)

THERMISTOR(OUTDOOR TEMP)

THERMISTOR(HEAT EXCHANGER)

W

BOARD-IN-WIRE

HEAT SINK

DEF

MAIN MOTOR OPERATED VALVE

4-WAY VALVE

FAN MOTOR

COMPRESSOR MOTOR

HS

RE1,2

TH5

TH4

TH3

TH2

TH1

DEFROST VALVE

MMV

RV

FMO

CM

DESCRIPTIONSYMBOLS

854

-

2

-

5269

-

184

-

00

-

2

ELECTRIC WIRING DIAGRAM

MULTIPLE INDOOR UNITS

HEAT-PUMP OUTDOOR UNIT FOR THREE-ROOM

20

When connecting each power wire to the correspond­ing terminal, follow the instructions below and fasten
the wire securely tight with the fixing screw of the ter­minal plate.

a) For Indoor Unit

(1) Cut the wire end with a cutting pliers, then strip

the insulation to expose the wire about 7 mm. See
the label (Fig. 29) near the terminal plate.

(2) Using a screwdriver, loosen the terminal screw on

the terminal plate.

(3) Insert the wire and tighten the terminal screw

completely using a screwdriver.

b) For Outdoor Unit

■ For solid core wiring (or F-cable)

(1) Cut the wire end with a cutting pliers, then strip the

insulation to expose the solid wire about 25 mm.
(Fig. 30a)

(2) Using a screwdriver, remove the terminal screw(s)

on the terminal plate.

(3) Using the pliers, bend the solid wire to form a loop

suitable for the terminal screw.

(4) Shape the loop wire properly, place it on the termi-

nal plate and fix it securely with the removed ter­minal screw using a screwdriver.

■ For stranded wiring

(1) Cut the wire end with a cutting pliers, then strip

the insulation to expose the stranded wiring about
10 mm and tightly twist the wire ends. (Figs. 30b
and 31a)

(2) Using a screwdriver, remove the terminal screw(s)

on the terminal plate.

(3) Using a ring connector fastener or pliers, securely

clamp each stripped wire end with a ring connec­tor. (Fig. 30b)

(4) Place the ring connector wire, and replace and

tighten the removed terminal screw using a
screwdriver. (Fig. 31b)

Solid wire

Loop

Insulation

Strip 25 mm

Fig. 30a

STRIP
SIZE

7 mm (ACTUAL

SIZE)

Fig. 29

Stranded wire

Ring
connector

Strip 10 mm

Fig. 30b

Screw

Ring connector

Terminal plate

Wire

Special
washer

Fig. 31b

Screw and
special washer

Ring
connector

Wire

WARNING

Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist.
Therefore, be sure all wiring
is tightly connected.

Twist wire ends

Fig. 31a

5-5. How to Connect Wiring to the Terminal

21

12 312 312 3

ABC

Attach the label

1

2

Ground

1

21 3 45 6 7 89 101112

1

2

4

1

2

4

Indoor unit A

Outdoor unit A

Indoor unit B

Indoor unit C

BK

WR

R

R

1

2

4

BK

W

BK

W

BK

WR

BK

W

R

BK

WR

A

B

C

Label A

Label B

Label C

Inter-unit cables
φ1.0 (not provided)

Inter-unit cables
φ1.0 (not provided)

Inter-unit cables
φ1.0 (not provided)

A is the indoor unit with
refrigerant tubing that is
connected to service valve
A (top) of the outdoor unit.

B is the indoor unit with
refrigerant tubing that is
connected to service valve
B (top) of the outdoor unit.

C is the indoor unit with
refrigerant tubing that is
connected to service valve
C (top) of the outdoor unit.

A

BC

Fasten the
cable with cable
fasteners.

Power cable (not provided)
(φ2.0 mm: Less than 15 m)
(φ2.6 mm: Less than 20 m)
(φ3.5 mm: Less than 26 m)

Power:
Single-phase,
220 240 V

Power switch
(not provided)

Terminal board

Terminal board

Terminal board

Terminal board

5-6. Wiring Instructions for the Outdoor Unit

● The below explanation uses model (GRF244MR5IAA)

as an example. With model (GRF194MR5IAA), there
is no terminal block C.

● Be sure to correctly align inter-unit cables A, B, and C.

● Never use φ2.6 mm VVF cable or a twisted-pair cable

for the inter-unit cable.

Be sure to perform grounding.

● Attach a ground wire to either the

outdoor unit or indoor unit.

● If there is a grounding terminal

inside the room, use the grounding
screw inside the indoor unit.

● Be sure to apply the provided labels to both ends of the inter-unit

cables to prevent miswiring. The units will not function if the wiring
connections are incorrect.

● Use a dedicated A/C circuit for power.

● To make connections to the outdoor unit, remove

the inspection panel and tubing panel.

● Do not bring the inter-unit cables or power cable

into contact with tubing or service valves.

● Use outdoor unit cable fasteners and fasten the

inter-unit cables at the location where the cables
are double-sheathed.

● Arrange the wiring so that the inter-unit cables are

contained in the inspection panel and tubing panel,
as shown in Fig. 32.

CAUTION

Fig. 32

22

6. Test Run

Performing a test run

● Refer to the test run procedures in the indoor unit

installation manual.

● Perform the test run separately for each connected

indoor unit. If 2 units are operated simultaneously, it
is not possible to correctly check for errors in tubing
and wiring.

● If the room temperature is 15°C or below, it may not

be possible to check for tubing errors with cooling
operation. If this occurs, perform heating operation
for each unit individually, and check that warm air is
discharged from each unit. If there is cold air mixed
in with the warm air, check the tubing connections
again.

Checking tubing and wiring

Perform the test run and check that operation is nor­mal. If there is an error in tubing or wiring, the refriger­ant may flow to indoor unit B when indoor unit A is
operated (for example).

● Stop operation immediately if there is an error in

tubing or wiring. Turn the power (breaker) to OFF,
and check whether the inter-unit cables are con­nected incorrectly, or whether the narrow tubes A
and B are connected in reverse. Correct the con­nections.

● If there is an error in tubing, pump-down must be

performed. Be sure to perform pump-down. After
making corrections, again purge the air from the
tubes.

CAUTION

23

7. Installation Check Sheet

The strength of the installation location is sufficient
to support the A/C weight.

The indoor and outdoor units are installed level and
vertically.

The power and voltage are as specified.
Inter-unit cables are securely fastened to the termi-

nal board.
Inter-unit cables are securely fixed.
The power cord and inter-unit cables are not con-

nected anywhere along their paths.
The ground wire is securely connected.
An air purge of the refrigerant circuit has been con-

ducted.
A leak test of the tubing connections has been per-

formed.
Thermal insulation has been applied to the tubing

connections.
Drain connections are secure and water drains

properly.
Putty has been used to close the hole in the wall.
All service valves are fully open.
Remote controller signals are being positively

received.

R.D. 28 Reyrieux BP 131 - 01601 Trévoux CEDEX France

Tél. [phone] - Fax [phone]

R.C.S. Bourg-en-Bresse B 759 200 728

In order to carry on a constant improvement, our products can be modified without prior notice.

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Par souci d’amélioration constante, nos produits peuvent être modifiés sans préavis.

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