Table of Contents
2.4. Combinations
The number of indoor units that can be connected are as follows:
Outdoor unit cooling
Model
capacity [kW]
AJ*072LELBH
22.4
AJ*090LELBH
28.0
AJ*108LELBH
33.5
AJ*126LELBH
40.0
AJ*144LELBH
45.0
AJ*162LELBH
50.0
*1: The conditions may differ depending on the connected indoor unit. For detailed infor-
mation, refer to the Design and Technical Manual.
2.5. Optional parts
The following parts are optional parts specific to R410A refrigerant.
Do not use parts other than those listed below.
2.5.1 Separation tube kit and Header
Separation tube
Total cooling ca-
and header uses
pacity of indoor
the following parts.
unit (kw)
A header is used
19.6 or less
for connecting the
indoor units.
28.0 or less
28.1 or more
2.5.2 External connect kit
Model
For External input (CN131, CN132, CN133, CN134)
UTY-XWZXZ6
For External output (Error status / CN136) (Operation status / CN137)
UTY-XWZXZF
For External input (CN135)
UTY-XWZXZ9
For External output (Base heater / CN115)
3. INSTALLATION WORK
Please obtain the approval of the customer when selecting the location of installation and
installing the main unit.
3.1. Selecting an installation location
Install the unit in a location that can withstand its weight, and where it will not topple or
fall.
Calculate the proper refrigerant concentration if you will be installing it in an enclosed
location.
Total amount of replenished refrigerant
in refrigerant facility (kg)
Capacity of smallest room where unit
is installed (m³)
If the results of the calculation exceed the concentration limit, increase the room surface
area or install a ventilation duct.
Do not tilt the outdoor unit more than 0.3 degrees. However, do not install the unit with it
tilted towards the side containing the compressor.
Install this unit in a location with good ventilation.
If the unit must be installed in an area within easy reach of the general public, install as
necessary a protective fence or the like to prevent their access.
Install the unit in an area that would not inconvenience your neighbors, as they could be
affected by the airflow coming out from the outlet, noise, or vibration.
If it must be installed in proximity to your neighbors, be sure to obtain their approval.
If the unit is installed in a cold region that is affected by snow accumulation, snow fall, or
freezing, take appropriate measures to protect it from those elements.
To ensure a stable operation, install inlet and outlet ducts.
Install the unit in an area that would not cause problems even if the drain water is
discharged from the unit. Otherwise, provide drainage that would not affect people or
objects.
Install the unit in an area that has no heat sources, vapors, or the risk of the leakage of
flammable gas in the vicinity.
Install the unit in an area that is away from the exhaust or vent ports that discharge
vapor, soot, dust, or debris.
Install the indoor unit, outdoor unit, power supply cable, transmission cable and remote
control cable at least 1 meter away from a television or radio.
The purpose of this is to prevent TV reception interference or radio noise. (Even if they
are installed more than 1 meter apart, you could still receive noise under some signal
conditions.)
Keep the length of the piping of the indoor and outdoor units within the allowable range.
For maintenance purposes, do not bury the piping.
En-3
Connectable total
Maximum connect-
indoor unit capacity
able indoor units
ratio [%]
20
25
30
50 to 150 (*1)
36
40
42
CAUTION
Header
Separation
tube
3-6 Branches
3-8 Branches
UTP-AX054A
UTR-H0906L
UTR-H0908L
UTP-AX090A
UTP-AX180A UTR-H1806L
UTR-H1808L
Usage
WARNING
Refrigerant concentration (kg/m³)
≤
(0.42 kg/m³)
CAUTION
3.2. Drain processing
Perform drain work in accordance with this Manual, and ensure that the drain water is
properly drained. If the drain work is not carried out correctly, water may drip down from
the unit, wetting the furniture.
When the outdoor temperature is 0 °C or less, do not use the accessory drain pipe
and drain cap. If the drain pipe and drain cap are used, the drain water in the pipe may
freeze in extremely cold weather.
• If you are installing the drain pipe and drain caps,
please provide a working space under the base of
the outdoor unit.
• As the drain water flows out of the outdoor unit
during heating operation, install the drain pipe and
connect it to a commercial 16 mm hose.
• When installing the drain pipe, plug all the holes
other than the drain pipe mounting hole in the
bottom of the outdoor unit with putty so there is no
water leakage.
Air
Drain cap mounting
hole × 9
3.3. Installation dimensions
Provide sufficient installation space, such as transportation route, maintenance space,
ventilation space, refrigerant piping space, and passageways.
Pay attention to the specifications of the installation space as shown in the figure. If
the unit is not installed according to specifications, it may cause short circuit or poor
performance. The unit may be prone to lapse into non-operation due to high pressure
protection.
When there is a wall in front of the unit, provide a space of 500 mm or more as mainte-
nance space.
When there is a wall at the right side of the unit, provide a space of 100 mm or more.
An outdoor temperature of 35°C (DB) in air-conditioned operation is assumed for the
installation space in this item. If the outdoor temperature exceeds 35°C (DB) and the
outdoor unit is operating at a load exceeding its rated ability, provide a larger inlet
space.
If you are installing more outdoor units than indicated here, please ensure sufficient
space or consult your distributing agent as it may affect the performance due to short
circuit and other problems.
Consider the transportation route, installation space, maintenance space, and access,
and install the unit in a location with sufficient space for the refrigerant piping.
Keep the space shown in the installation examples.
If the installation is not performed accordingly, it
could cause a short circuit and result in a lack of
operating performance.
Do not obstruct the air intake of the outdoor unit with
piping, wiring, stand, etc.
Refer to the Design and Technical Manual for installations not described in the following
examples.
Other installation is not recommended. Performance may drop significantly.
CAUTION
Drain pipe mounting hole
Base of the outdoor unit
Drain pipe
Unit: mm
600
Drain pipe
mounting hole
CAUTION
Front
Air intake
Rear
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