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2. ABOUT THIS PRODUCT
2.1. Precautions for using R410A refrigerant
Do not introduce any substance other than the prescribed refrigerant into the refrigera-
tion cycle. If air enters the refrigeration cycle, the pressure in the refrigeration cycle will
become abnormally high and cause the piping to rupture.
If there is a refrigerant leak, make sure that it does not exceed the concentration limit.
If a refrigerant leak exceeds the concentration limit, it can lead to accidents such as
oxygen starvation.
Do not touch refrigerant that has leaked from the refrigerant pipe connections or other
area. Touching the refrigerant directly can cause frostbite.
If a refrigerant leak occurs during operation, immediately vacate the premises and thor-
oughly ventilate the area. If the refrigerant comes in contact with a flame, it produces a
toxic gas.
2.2. Special tools for R410A
To install a unit that uses R410A refrigerant, use dedicated tools and piping materi-
als that have been manufactured specifically for R410A use. Because the pressure
of R410A refrigerant is approximately 1.6 times higher than the R22, failure to use
dedicated piping material or improper installation can cause rupture or injury.
Furthermore, it can cause serious accidents such as water leakage, electric shock, or
fire.
Tool name
Pressure is huge and cannot be measured with a conventional
(R22) gauge. To prevent erroneous mixing of other refrigerants,
the diameter of each port has been changed.
Gauge manifold
It is recommended to use a gauge manifold with a high pressure
display range 500 micron to 768 psi (–0.1 to 5.3 MPa) and a low
pressure display range 500 micron to 551 psi (–0.1 to 3.8 MPa).
To increase pressure resistance, the hose material and base size
Charging hose
were changed.
A conventional (R22) vacuum pump can be used by installing a
vacuum pump adapter.
• A conventional vacuum pump can be used by installing a
Vacuum pump
vacuum pump adapter.
• Be sure that the pump oil does not back flow into the system.
Use one capable for vacuum suction of 500 micron (–100.7
kPa).
Gas leakage
Special gas leakage detector for HFC refrigerant R410A.
detector
2.3. Accessories
For installation purposes, be sure to use the parts supplied by the manufacturer or other
prescribed parts.
The use of non-prescribed parts can cause serious accidents such as the unit falling,
water leakage, electric shock, or fire.
• The following installation parts are furnished. Use them as required.
• Keep the Installation Manual in a safe place and do not discard any other accessories
until the installation work has been completed.
Name and Shape
Q'ty
Operating
Manual
Installation
Manual
Wall hook
bracket
Tapping screw (M4 × 25 mm)
Cloth tape
Seal A
WARNING
WARNING
Contents of change for R22 tool
WARNING
Application
1
(This book)
1
For indoor unit installation.
1
For wall hook bracket installation.
5
For indoor unit installation.
1
It is used when the diameter of gas pipe
is Ø1/2 in (12.70 mm) or more.
1
Name and Shape
Q'ty
Air cleaning filter
Air cleaning filter frame
2.4. Optional parts
Description
Model
UTY-XWZXZC For output function (Output terminal / CNB01)
For control input function (Apply voltage terminal /
UTY-XWZXZB
CNA01)
External
UTY-XWZXZD For control input function (Dry contact terminal / CNA02)
connect kit
For forced thermostat off function (Apply voltage termi-
UTY-XWZXZ7
nal / CNA03)
For forced thermostat off function (Dry contact terminal /
UTY-XWZXZE
CNA04)
Wireless
UTY-TFSXZ*
For wireless LAN control.
LAN adapter
MODBUS®
For connecting a single indoor unit system to the Mod-
UTY-VMSX
convertor
bus® network.
External
Supply power to the indoor unit PCB when the indoor
power sup-
UTZ-GXXA
unit is turned off to prevent errors.
ply unit
2.5. About unit of the length
This product is manufactured to metric units and tolerances. United States customary
units are provided for reference only. In cases where exact dimensions and tolerances are
required, always refer to metric units.
3. INSTALLATION WORK
Correct initial installation location is important because it is difficult to move unit after it is installed.
3.1. Selecting an installation location
Decide the mounting position together with the customer as follows.
Select installation locations that can properly support the weight of the indoor unit.
Install the units securely so that they do not topple or fall.
Do not install the indoor unit in the following areas:
• Area with high salt content, such as at the seaside. It will deteriorate metal parts, caus-
ing the parts to fail or the unit to leak water.
• Area filled with mineral oil or containing a large amount of splashed oil or steam, such as
a kitchen. It will deteriorate plastic parts, causing the parts to fail or the unit to leak water.
• Area that generates substances that adversely affect the equipment, such as sulfuric
gas, chlorine gas, acid, or alkali. It will cause the copper pipes and brazed joints to
corrode, which can cause refrigerant leakage.
• Area that can cause combustible gas to leak, contains suspended carbon fibers or
flammable dust, or volatile inflammables such as paint thinner or gasoline. If gas leaks
and settles around the unit, it can cause a fire.
• Area where animals may urinate on the unit or ammonia may be generated.
Do not use the unit for special purposes, such as storing food, raising animals, growing
plants, or preserving precision devices or art objects.
It can degrade the quality of the preserved or stored objects.
Do not install where there is the danger of combustible gas leakage.
Do not install the unit near a source of heat, steam, or flammable gas.
Install the unit where drainage does not cause any trouble.
Install the indoor unit, power supply cable, transmission cable, and remote controller
cable at least 40 in (1 m) away from a television or radio receivers. The purpose of this
is to prevent TV reception interference or radio noise. (Even if they are installed more
than 40 in (1 m) apart, you could still receive noise under some signal conditions.)
If children under 10 years old may approach the unit, take preventive measures so that
they cannot reach the unit.
Take precautions to prevent the unit from falling.
(1) Install the indoor unit on a place having a sufficient strength so that it withstands
against the weight of the indoor unit.
(2) The inlet and outlet ports should not be obstructed; the air should be able to blow all
over the room.
(3) Leave the space required to service the air conditioner.
(4) Install the unit where connection to the outdoor unit (or RB unit) is easy.
(5) Install the unit where the connection pipe can be easily installed.
(6) Install the unit where the drain pipe can be easily installed.
(7) Install the unit where noise and vibrations are not amplified.
(8) Take servicing, etc., into consideration and leave the spaces. Also install the unit
where the filter can be removed.
(9) Do not install the unit where it will be exposed to direct sunlight.
Application
For installation, refer to the "CLEANING
2
AND CARE" in the operating manual.
2
Application
WARNING
CAUTION
En-2
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