INDOOR UNIT
(1) Install the indoor unit level on a strong wall, floor, ceiling which is not subject to vibration.
(2) The inlet and outlet ports should not be obstructed : the air should be able to blow all over the room.
(3) Install the unit near an electric outlet or special branch circuit.
(4) Do not install the unit where it will be exposed to direct sunlight.
(5) Install the unit where connection to the outdoor unit is easy.
(6) Install the unit where the drain pipe can be easily installed.
(7) Take servicing, etc., into consideration and leave the spaces shown in figure. Also install the unit where the filter can be removed.
•••••
Floor console
Contents of change
Pressure is high and cannot be measured with a conventional gauge. To prevent erroneous mixing of other
refrigerants, the diameter of each port has been changed.
It is recommended the gauge with seals –0.1 to 5.3 MPa (–76 cmHg to 53 kgf/cm
2
) for high pressure.
–0.1 to 3.8 MPa (–76 cmHg to 38 kgf/cm
2
) for low pressure.
To increase pressure resistance, the hose material and base size were changed.
A conventional vacuum pump can be used by installing a vacuum pump adapter.
Special gas leakage detector for HFC refrigerant R410A.
Tool name
Gauge manifold
Charge hose
Vacuum pump
Gas leakage detector
Left
Right
30 cm (12") or more
30 cm (12") or more
CONNECTION PIPE
REQUIREMENT
CAUTION
Install heat insulation around both the gas and liquid pipes.
Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 248 °F. (Re-
verse cycle model only)
In addition, if the humidity level at the installation location
of the refrigerant piping is expected to exceed 70%, install
heat insulation around the refrigerant piping. If the expected
humidity level is 70-80%, use heat insulation that is 15 mm
(19/32") or thicker and if the expected humidity exceeds 80%,
use heat insulation that is 20 mm (3/4") or thicker.
If heat insulation is used that is not as thick as specified,
condensation may form on the surface of the insulation.
In addition, use heat insulation with heat conductivity of
0.045 W/(m·K) or less (at 68 °F).
Connect the connection pipes according to “
3
CONNECTING THE
PIPING” in this installation instruction sheet.
•••••
Under ceiling
Right
Left
Indoor unit
Ceiling
Ceiling
15 cm (6") or more
30 cm (12") or more
2 cm (3/4") or more
•••••
Use pipe with water-resistant heat insulation.
•••••
Use pipe that can withstand a pressure of 4,150 kPa.
14000, 18000 BTU/h
24000 BTU/h
model
model
MODEL
Diameter
Liquid
Gas
6.35 mm (1/4 in.) 9.52 mm (3/8 in.)
12.70 mm (1/2 in.) 15.88 mm (5/8 in.)
ELECTRICAL REQUIREMENT
•••••
Electric wire size:
•••••
Install all electrical works in accordance to the standard.
•••••
Install the disconnect device with a contact gap of at least 3 mm (1/8")
in all poles nearby the units. (Both indoor unit and outdoor unit)
•••••
Install the circuit breaker nearby the units.
Connection cord (mm
2
)
MAX.
MIN.
2.5
1.5
Indoor unit
To outdoor unit
Floor console
This air conditioner uses new refrigerant HFC (R410A).
The basic installation work procedures are the same as conventional refrigerant models.
However, pay careful attention to the following points:
(1) Since the working pressure is 1.6 times higher than that of conventional refrigerant models, some of the piping and instal-
lation and service tools are special. (See the table below.)
Especially, when replacing a conventional refrigerant model with a new refrigerant R410A model, always replace the con-
ventional piping and flare nuts with the R410A piping and flare nuts.
(2) Models that use refrigerant R410A have a different charging port thread diameter to prevent erroneous charging with
conventional refrigerant and for safety. Therefore, check beforehand. [The charging port thread diameter for R410A is 1/2
UNF 20 threads per inch.]
(3) Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with refrigerant models. Also, when
storing the piping, securely seal the openings by pinching, taping, etc.
(4) When charging the refrigerant, take into account the slight change in the composition of the gas and liquid phases, and
always charge from the liquid phase side whose composition is stable.
Special tools for R410A
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount
of residual oil is less than 40 mg/10 m. Do not use copper pipes having a
collapsed, deformed or discolored portion (especially on the interior surface).
Otherwise, the expansion valve or capillary tube may become blocked with
contaminants.
As an air conditioner using R410A incurs pressure higher than when using
conventional refrigerant, it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in table. Never
use copper pipes thinner than that in the table even when it is available on the
market.
Thickness mm (inch)
R410A
0.80 (0.0315)
0.80 (0.0315)
0.80 (0.0315)
1.00 (0.0394)
Outer diameter
mm (inch)
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
Thicknesses of Annealed Copper Pipes
SELECTING THE MOUNTING POSITION
WARNING
Install at a place that can withstand the weight of the indoor and outdoor units and install positively so that the units will not
topple or fall.
CAUTION
(1) Do not install where there is the danger of combustible gas leakage.
(2) Do not install near heat sources.
(3) If children under 10 years old may approach the unit, take preventive measures so that they cannot reach the unit.
Decide the mounting position with the customer as follows:
CAUTION
This installation instruction sheet describes how to the indoor unit only.
To install the outdoor unit, refer to the installation instruction sheet included with the outdoor unit.
Indoor unit
To outdoor unit
Under ceiling
GENERAL
This INSTALLATION INSTRUCTION SHEET 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 acces-
sory parts listed are with the system before beginning.
