En-3
2.4. Combinations
The number of indoor units that can be connected are as follows:
Model
Outdoor unit cooling
capacity [kW]
Maximum connect-
able indoor units
Connectable total
indoor unit capacity
ratio [%]
AJ*072LELDH 22.4 20
50 to 150 (*1)
AJ*090LELDH 28.0 25
AJ*108LELDH 33.5 30
AJ*126LELDH 40.0 36
AJ*144LELDH 45.0 40
AJ*162LELDH 50.0 42
*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
CAUTION
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
and header uses
the following parts.
A header is used
for connecting the
indoor units.
Total cooling ca-
pacity of indoor
unit (kw)
Separation
tube
Header
3-6 Branches 3-8 Branches
19.6 or less UTP-AX054A
UTR-H0906L UTR-H0908L
28.0 or less UTP-AX090A
28.1 or more UTP-AX180A UTR-H1806L UTR-H1808L
2.5.2 External connect kit
Model Usage
UTY-XWZXZ6
For External input (CN131, CN132, CN133, CN134)
For External output (Error status / CN136) (Operation status / CN137)
UTY-XWZXZF
For External input (CN135)
UTY-XWZXZ9
For External output (Base pan heater / CN115)
3. INSTALLATION WORK
Obtain the approval of the customer when selecting the location of installation and install-
ing the main unit.
3.1. Selecting an installation location
WARNING
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 additional refrigerant
charge in refrigerant facility (kg)
≤
Refrigerant concentration (kg/m³)
(0.42 kg/m³)
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.
CAUTION
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 pipes of the indoor and outdoor units within the allowable range.
For maintenance purposes, do not bury the pipes.
3.2. Drain processing
CAUTION
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 cold climate.
• If you are installing the drain pipe and drain caps,
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 commercially available 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.
Base of the outdoor unit
Drain pipe
Drain pipe mounting hole
600
Air
Unit: mm
Drain cap mounting
hole × 9
Drain pipe
mounting hole
3.3. Space requirement
CAUTION
Provide sufficient space requirement, such as transportation route, maintenance space,
ventilation space, refrigerant piping space, and passageways.
Pay attention to the specifications of the space requirement 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
space requirement 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, 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, space requirement, 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.
Air intake
Rear
Front
Do not obstruct the air intake of the outdoor unit with
pipes, cables, 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.
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