En-6
Capacity of indoor
unit
Gas pipe size
(thickness)
in. (in.) [mm (mm)]
Liquid pipe size
(thickness)
in. (in.) [mm (mm)]
7 – 12
ø3/8 (0.032) [ø9.52 (0.8)]
ø1/4 (0.032) [ø6.35 (0.8)]
15, 18
ø1/2 (0.032) [ø12.70 (0.8)]
ø1/4 (0.032) [ø6.35 (0.8)]
24
ø5/8 (0.039) [ø15.88 (1.0)]
ø1/4 (0.032) [ø6.35 (0.8)]
CAUTION
Operation cannot be guaranteed if the correct combination of pipes, valves, etc., is not
used to connect the indoor and outdoor units.
3. 4. Heat insulation around connection pipes requirements
CAUTION
Install heat insulation around both the gas and liquid pipes.
Failure to do so may cause water leaks.
Use heat insulation with heat resistance above 248 °F. (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is
expected to exceed 70%, install heat insulation around the refrigerant piping. If the
expected humidity level is 70-80%, use heat insulation that is 9/16 in. (15 mm) or
thicker and if the expected humidity exceeds 80%, use heat insulation that is 13/16 in.
(20 mm) or thicker.
If heat insulation is used that is not as thick as speci
fi
ed, condensation may form on
the surface of the insulation. In addition, use heat insulation with heat conductivity of
0.045 W/(m·K) or less (at 68 °F).
Connect the connection pipes according to “5.1. Pipe connection” in this installation manual.
3. 5. Operating range
Model
Temperature
Indoor air intake
Outdoor air intake
45 type
Cooling
Maximum
90 °F(32.2 °C) DB
115 °F(46.1 °C) DB
Minimum
65 °F(18.3 °C) DB
14 °F(-10.0 °C) DB
Heating
Maximum
88 °F(31.1 °C) DB
75 °F(23.8 °C) DB
Minimum
60 °F(15.5 °C) DB
5 °F(-15.0 °C) DB
36 type
Cooling
Maximum
90 °F(32.2 °C) DB
115 °F(46.1 °C) DB
Minimum
65 °F(18.3 °C) DB
14 °F(-10.0 °C) DB
Heating
Maximum
88 °F(31.1 °C) DB
75 °F(23.8 °C) DB
Minimum
60 °F(15.5 °C) DB
-15 °F(-26.1 °C) DB
Indoor humidity about 80% or less
3. 6. Additional charging
Refrigerant suitable for a total piping length of 164 ft. (50 m) is charged in the outdoor unit
at the factory.
When the piping is longer than 164 ft. (50 m), additional charging is necessary.
For the additional amount, see the table below.
Total piping
length [ft. (m)]
164 (50) or less 197 (60) 230 (70) 264 (80)
Additional
refrigerant
charge
45 type
None
7 oz.
(200 g)
14 oz.
(400 g)
1 lbs. 5
oz.
(600 g)
0.21
oz./ft.
(20 g/m)
36 type
None
7 oz.
(200 g)
14 oz.
(400 g)
—
CAUTION
When moving and installing the air conditioner, do not mix gas other than the speci
fi
ed
refrigerant (R410A) inside the refrigerant cycle.
When charging the refrigerant R410A, always use an electronic balance for refrigerant
charging (to measure the refrigerant by weight).
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.
R410A
Gas
Liquid
Add refrigerant from the charging valve after the completion of the work.
If the units are further apart than the maximum pipe length, correct operation cannot
be guaranteed.
4. INSTALLATION WORK
Please obtain the approval of the customer when selecting the location of installation and
installing the unit.
4. 1. Selecting an installation location
WARNING
Securely install the outdoor unit at a location that can withstand the weight of the unit.
Otherwise, the outdoor unit may fall and cause injury.
Be sure to install the outdoor unit as prescribed, so that it can withstand earthquakes
and typhoons or other strong winds. Improper installation can cause the unit to topple
or fall, or other accidents.
Do not install the outdoor unit near the edge of a balcony. Otherwise, children may
climb onto the outdoor unit and fall off of the balcony.
CAUTION
Do not install the outdoor unit in the following areas:
• Area with high salt content, such as at the seaside. It will deteriorate metal parts,
causing the parts to fail or the unit to leak water.
• Area
fi
lled 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 containing equipment that generates electromagnetic interference. It will
cause the control system to malfunction, preventing the unit from operating nor-
mally.
• Area that can cause combustible gas to leak, contains suspended carbon
fi
bers or
fl
ammable dust, or volatile in
fl
ammables such as paint thinner or gasoline. If gas
leaks and settles around the unit, it can cause a
fi
re.
• Area that has heat sources, vapors, or the risk of the leakage of
fl
ammable gas in
the vicinity.
• Area where small animals may live. It may cause failure, smoke or
fi
re if small
animals enter and touch internal electrical parts.
• Area where animals may urinate on the unit or ammonia may be generated.
Please install the outdoor unit without slant.
Install the outdoor unit in a well-ventilated location away from rain or direct sunlight.
If the outdoor 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 outdoor unit in a location that would not inconvenience your neighbors, as
they could be affected by the air
fl
ow 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 outdoor 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 outdoor unit in a location that is away from exhaust or the vent ports that
discharge vapor, soot, dust, or debris.
Install the indoor unit, outdoor unit, power supply cable, connection cable, and remote
control cable at least 40 in. (1 m) away from a television or radio receivers. The pur-
pose 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.)
Branch switch and
circuit breaker
Branch switch and
circuit breaker
40 in. (1 m) or more
40 in. (1 m) or more
If children under 10 years old may approach the unit, take preventive measures so
that they cannot reach the unit.
Keep the length of the piping of the indoor and outdoor units within the allowable
range.
For maintenance purposes, do not bury the piping.
4. 2. Installation dimensions
CAUTION
Install the unit where it will not be tilted by more than 3
˚
. However, do not install the
unit with it tilted towards the side containing the compressor.
When installing the outdoor unit where it may exposed to strong wind, fasten it se-
curely.
Decide the mounting position with the customer as follows:
(1) Install the outdoor unit in a location which can withstand the weight of the unit and
vibration, and which can install horizontally.
(2) Provide the indicated space to ensure good air
fl
ow.
(3) If possible, do not install the unit where it will be exposed to direct sunlight.
(If necessary, install a blind that does not interfere with the air
fl
ow.)
(4) Do not install the unit near a source of heat, steam, or
fl
ammable gas.
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