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This mark indicates procedures which, if improperly per-
CAUTION
formed, might possibly result in personal harm to the user, or
damage to property.
This unit must be installed by qualified personnel with a capacity certificate for handling
refrigerant fluids. Refer to regulation and laws in use on installation place.
The installation must be carried out in compliance with regulations in force in the place
of installation and the installation instructions of the manufacturer.
This unit is part of a set constituting an air conditioner. It must not be installed alone or
with non-authorized by the manufacturer.
This unit contains no user-serviceable parts. Always consult authorized service person-
nel to repairs.
When moving, consult authorized service personnel for disconnection and installation
of the unit.
• Obtain the distribution network operator's agreement about the power capacity of the
power supply system, specification of the cable and the harmonic current, and etc.
when you connect the outdoor unit with the power supply.
• This unit must be connected to a power supply with impedance of 0.33 ohm and
below. If the power supply does not satisfy this requirement, please consult the power
supplier.
• This product is intended for professional use.
Be sure to use a dedicated power circuit.
Never use a power supply shared by another appliance.
Do not install the unit in the following areas:
• Area with high salt content, such as at the seaside.
It will deteriorate metal parts, causing the parts to fall 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 fall 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 containing equipment that generates electromagnetic interference.
It will cause the control system to malfunction, preventing the unit from operating
normally.
• Area that can cause combustible gas to leak, contains suspended carbon fibers or
flammable dust, or volatile flammables such as paint thinner or gasoline.
If gas leaks and settles around the unit, it can cause a fire.
• Avoid installing the unit at places where it will come into contact with animals' urine or
ammonia.
The units are not explosion proof and therefore should not be installed in explosive
atmosphere.
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.
Ground the unit. Do not connect the ground wire to a gas pipe, water pipe, lightning rod,
or a telephone ground wire. Improper grounding may cause electric shock.
Perform draining for the unit according to the Installation manual. Check that the water
is properly drained.
If the drain processing is improperly installed, water may drip down from the unit, wet-
ting the furniture.
Do not touch the fins with bare hands.
Be sure not to start or stop the operation of air conditioning with power breaker. Other-
wise, it may cause malfunction or water leakage.
When setting it up near the equipment that generates electromagnetic waves and the
equipment that generates the higher harmonics wave, be sure to take measures against
noise. Otherwise, it may cause malfunction or failure.
When energizing to the crankcase heater, please turn on the power 12 hours or earlier
before operation begins. When the energizing time is short, it may cause failure. Be-
sides, please do not turn off power during the busy season.
Children should be monitored to ensure they do not play with the device.
This product is not intended to be used by people (including children) with physical, sen-
sory or mental disability, or persons lacking experience or knowledge unless they have
been given by the through a person responsible for their safety, supervision or instruc-
tion concerning the use of the device.
2. ABOUT THIS PRODUCT
2.1. Precautions for using R410A refrigerant
Pay careful attention to the following points:
Since the working pressure is 1.6 times higher than that of R22 models, some of the
piping and installation and service tools are special. (See the table in the SPECIAL
TOOLS FOR R410A section.)
Especially, when replacing a conventional refrigerant (other than R410A) model with
a new refrigerant R410A model, always replace the conventional piping and flare nuts
with the R410A piping and flare nuts.
Models that use refrigerant R410A have a different charging port thread diameter to pre-
vent erroneous charging with R22, R407C and for safety. Therefore, check beforehand.
[The charging port thread diameter for R410A is 1/2 UNF 20 threads per inch.]
Be more careful than the installation of the refrigerant (other than R410A) models, not
to enter foreign matters (oil, water, etc.) and other refrigerant into the piping. Also, when
storing the piping, securely seal the openings 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 side whose
composition is stable.
2.2. Special tools for R410A
Tool name
Contents of change for R22 tool
Pressure is huge and cannot be measured with a conventional gauge.
To prevent erroneous mixing of other refrigerants, the diameter of
Gauge mani-
each port has been changed.
fold
It is recommended to use a gauge manifold with a high pressure
display range -0.1 to 5.3 MPa and a low pressure display range -0.1
to 3.8 MPa.
To increase pressure resistance, the hose material and base size
Charging hose
were changed.
A conventional vacuum pump can be used by installing a vacuum
pump adapter.
• A conventional vacuum pump can be used by installing a vacuum
Vacuum pump
pump adapter.
• Be sure that the pump oil does not back flow into the system. Use
one capable for vacuum suction of -100.7kPa (5 Ton, -755mmHg).
Gas leakage
Special gas leakage detector for HFC refrigerant R410A.
detector
2.3. Accessories
Use connecting parts as required.
Do not throw away the connecting parts until the installation has been complete.
Name and shape
Specifications manual
Installation manual
Joint pipe A
Joint pipe B
Cable tie
Grommet edging
2.4. Combinations
A maximum of 3 outdoor
units can be connected to 1
Model
refrigerant system.
The combination of outdoor
units per refrigerant system
AJ*072LALDH
and the number of indoor
AJ*090LALDH
units that can be connected
AJ*108LALDH
are as follows:
AJ*126LALDH
AJ*144LALDH
*1: The conditions may differ depending on the connected indoor unit. For more informa-
tion, please refer to the Design & Technical manual.
Space saving combination
Combination (HP)
8
10
Outdoor Unit 1 (HP)
8
10
Outdoor Unit 2 (HP)
―
―
Outdoor Unit 3 (HP)
―
―
Maximum Connectable
17
21
Indoor Unit
Combination (HP)
32
34
Outdoor Unit 1 (HP)
16
16
Outdoor Unit 2 (HP)
16
10
Outdoor Unit 3 (HP)
―
8
Maximum Connectable
64
64
Indoor Unit
When connecting outdoor units, install the outdoor unit with the largest nominal system
capacity nearest to the refrigerant pipe and indoor unit, followed by those with lesser
nominal system capacities. (Outdoor unit 1 ≥ Outdoor unit 2 ≥ Outdoor unit 3)
Q'ty
Application
1
—
(This manual)
1
For connecting gas pipe (Straight
1
type)
For connecting gas pipe (L type)
1
For binding power cable and transmis-
4
sion cable
For power supply cable and connec-
2
tion cable installation. Attach to the
knockout hole.
Connectable
Nominal System
total indoor unit
Capacity [HP]
capacity ratio [%]
8
10
12
50 to 150 (*1)
14
16
12
14
16
18
20
22
24
26
12
14
16
10
10
14
14
16
―
―
―
8
10
8
10
10
―
―
―
―
―
―
―
―
26
30
34
39
43
47
52
56
36
38
40
42
44
46
48
16
16
16
16
16
16
16
10
12
14
16
16
16
16
10
10
10
10
12
14
16
64
64
64
64
64
64
64
28
30
16
16
12
14
―
―
60
64
En-2
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