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CAUTION
• While following the instructions in this installation manual, install
drain piping to ensure proper drainage and insulate piping to pre-
vent condensation.
Improper drain piping may result in indoor water leakage and
property damage.
• Install the indoor and outdoor units, power cord and connecting
wires at least 1 meter away from televisions or radios to prevent
picture interference and noise.
(Depending on the incoming signal strength, a distance of 1 meter
may not be sufficient to eliminate noise.)
• Remote controller (wireless kit) transmitting distance can be shorter
than expected in rooms with electronic fluorescent lamps (inverter or
rapid start types).
Install the indoor unit as far away from fluorescent lamps as possible.
• Make sure to provide for adequate measures in order to prevent
that the outdoor unit be used as a shelter by small animals.
Small animals making contact with electrical parts can cause mal-
functions, smoke or fire. Please instruct the customer to keep the
area around the unit clean.
• Do not install the air conditioner in the following locations:
1. Where there is a high concentration of mineral oil spray or
vapour (e.g. a kitchen).
Plastic parts will deteriorate, parts may fall off and water leak-
age could result.
2. Where corrosive gas, such as sulphurous acid gas, is pro-
duced.
Corroding of copper pipes or soldered parts may result in
refrigerant leakage.
3. Near machinery emitting electromagnetic radiation.
Electromagnetic radiation may disturb the operation of the
control system and result in a malfunction of the unit.
4. Where flammable gas may leak, where there is carbon fibre or
ignitable dust suspensions in the air, or where volatile flamma-
bles such as paint thinner or gasoline are handled.
Operating the unit in such conditions may result in fire.
2.
BEFORE INSTALLATION
2-1 About this product
1.
This product uses R744 (CO
2
The utmost attention is required to handle R744 refrigerant, and
strict measures must be taken to keep impurities (including min-
eral oil and other types of oil as well as moisture) out of the sys-
tem. Be sure to follow the instructions in "6. REFRIGERANT
PIPING".
2.
The design pressure is 12.3 MPa (4.0 MPa for R410A). Therefore,
the following conventional parts cannot be used.
• Connection pipes
Thick-walled pipes are required. Refer to "6. REFRIGERANT
PIPING" for the specifications of the pipes.
• Flare nut connections
Unavailable. Perform brazing connections.
• Pipe brazing joints
Pipes with a maximum diameter of 12.7mm ..... Make brazing
connections with sleeve flare processing.
Pipes with a diameter of 15.9mm...................... Use sockets
sold as optional accessories.
• Elbows
Use products sold as optional accessories.
• Installation instruments that must withstand high pressures,
such as charge hoses and pressure gauges
Use pressure-resistant instruments that withstand a minimum
pressure of 12.3 MPa.
3.
The indoor unit is an R744-dedicated unit. The following indoor
unit models are connectable. (Do not connect other indoor unit
models, or otherwise an inner piping rupture will result.)
2
) refrigerant.
CAUTION
• When installing the indoor unit, refer to the installation manual
provided for the indoor unit.
• Optional accessories are required for the installation of the prod-
uct. Refer to the information on optional accessory.
2-2 Standard supplied accessories
The following accessories are included. The storage location of the
accessories is shown in the figure.
Note
Do not throw away any of the accessories until installation is complete.
Name
Clamp (1) Clamp (2) Clamp (3)
Quantity
8 pcs.
2 pcs.
Shape
Small
Liquid side
Liquid side
Name
accessory
accessory
pipe (1)
pipe (2)
Quantity
1 pc.
1 pc.
Shape
Thin
Name
Thermal insulation tube
Quantity
1 pc.
Shape
2-3 Combination
The indoor units can be installed in the following range.
Indoor unit
Total capacity of indoor units
125 - 325
2-4 Option accessory
• The following refrigerant branching kit as an optional accessory is
required for piping. Refer to "6. REFRIGERANT PIPING" to select
the refrigerant branching kit.
REFNET joint
Gas side
Gas side
accessory
accessory
pipe (1)
pipe (2)
1 pc.
1 pc.
1 pc.
Large
Thick
Muffler
1 pc.
Others
1 pc. about each item
• Operation manual
• Installation manual
• Electric wiring diagram
booklet
• Declaration of conformity
• "REQUEST FOR THE
INDICATION" label
(Installation records)
Operation manual
Installation manual
Clamps
Accessory pipes
Total quantity of indoor units
16 units
BHRN26A33T
English
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