En-2
2.4. Accessories
The following installation accessories are supplied. Use them as required.
Name and Shape
Q’ty
Name and Shape
Q’ty
Operating Manual
1
Drain hose insulation
1
Installation Manual
(This manual)
1
Cloth tape
1
Wall hook bracket
1
Tapping screw (large)
M4 × 25 mm
8
Remote
controller
1
Tapping screw (small)
2
Battery
2
Air cleaning filter
2
Remote
controller
holder
1
Air cleaning filter frame
2
The following items are necessary to install this air conditioner. (The items are not includ-
ed with the air conditioner and must be purchased separately.)
Name Q’ty
Name Q’ty
Connection pipe assembly
1
Saddle
1 set
Connection cable (4-conductor)
1
Drain hose
1
Wall pipe
1
Tapping screws
1 set
Decorative tape
1
Sealant
1
Vinyl tape
1
M10 bolt, nut
4 set
Wall cap
1
2.5. Additional materials required for installation
A. Refrigeration (armored) tape
B. Insulated staples or clamps for connecting wire (See your local electrical codes.)
C. Putty
D. Refrigeration lubricant
E. Clamps or saddles to secure refrigerant piping
2.6. Optional parts
Refer to each installation manual for the method of installing optional parts.
Parts name
Model No.
Application
Wired Remote Controller
UTY-RNNUM
For air conditioner operation
Wireless Remote Controller
UTY-LNHUM
For air conditioner operation
Simple Remote Controlle
UTY-RSNUM
For air conditioner operation
External connect kit
UTY-XWZX
For control input/output port
3. GENERAL SPECIFICATIONS
This INSTALLATION MANUAL brie
fl
y 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.
3.1. Type of copper pipe and insulation material
CAUTION
Refer to the installation manual for the outdoor unit for description of allowable pipe length
and height difference.
Selecting pipe sizes
The diameters of the connection pipes according to the capacity of the indoor unit.
Refer to the following table for the proper diameters of the connection pipes between the
indoor unit and outdoor unit.
MODEL
Diameter
Liquid pipe
Gas pipe
18, 24
1/4 in. (6.35 mm)
1/2 in. (12.70 mm)
30, 36
3/8 in. (9.52 mm)
5/8 in. (15.88 mm)
2. ABOUT THIS PRODUCT
2.1. Precautions for using R410A refrigerant
The basic installation work procedures are the same as conventional refrigerant
(R22) models.
However, pay careful attention to the following points:
Since the working pressure is 1.6 times higher than that of conventional refrigerant
(R22) models, some of the piping and installation and service tools are special. (See
the following table.)
Especially, when replacing a conventional refrigerant (R22) model with a new refrigerant
R410A model, always replace the conventional piping and
fl
are nuts with the R410A piping
and
fl
are nuts.
Models that use refrigerant R410A have a different charging port thread diameter to pre-
vent erroneous charging with conventional refrigerant (R22) and for safety. Therefore,
check beforehand. [The charging port thread diameter for R410A is 1/2-20 UNF.]
Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant (R22) models. Also, when storing the piping ,securely seal the opening by
pinching, taping, etc.
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 where refrigerant
composition is stable.
2.2. Special tools for R410A
Tool name
Contents of change
Gauge manifold
Pressure is high and cannot be measured with a conven-
tional (R22) gauge. To prevent erroneous mixing of other
refrigerants, the diameter of each port has been changed.
It is recommended the gauge with seals -30 inHg to 768 psi
(-0.1 to 5.3 MPa) for high pressure.
-30 inHg to 551 psi (-0.1 to 3.8 MPa) for low pressure.
Charge hose
To increase pressure resistance, the hose material and base
size were changed.
Vacuum pump
A conventional vacuum pump can be used by installing a
vacuum pump adapter.
Gas leakage detector
Special gas leakage detector for HFC refrigerant R410A.
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of residual
oil is less than 0.004 oz/100 ft. (40 mg/10 m). Do not use copper pipes having a collapsed,
deformed or discolored portion (especially on the interior surface). Otherwise, the expansion
value or capillary tube may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using R22, it is nec-
essary to choose adequate materials.
WARNING
Do not use the existing (for R22) piping and
fl
are nuts.
If the existing materials are used, the pressure inside the refrigerant cycle will rise and
cause failure, injury, etc. (Use the special R410A materials.)
When installing and relocating the air conditioner, do not mix gases other than the
speci
fi
ed refrigerant (R410A) to enter the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to
an abnormally high value and cause failure, injury, etc.
2.3. For authorized service personnel only.
WARNING
For the air conditioner to operate satisfactorily, install it as outlined in this installation
manual.
Connect the indoor unit and outdoor unit with the air conditioner piping and cables
available from your local distributor. This installation manual describes the correct con-
nections using the installation set available from your local distributor.
Do not turn on the power until all installation work is complete.
CAUTION
This installation manual describes how to install the indoor unit only.
To install the outdoor unit, refer to the installation manual included with the outdoor unit.
• Be careful not to scratch the air conditioner when handling it.
• After installation, explain correct operation to the customer, using the operating manual.
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