En-3
UNIT B ø6.35, ø9.52
UNIT A ø6.35, ø9.52
LIMITATION OF REFRIGERANT PIPING LENGTH
2. 4. 3.
CAUTION
The total maximum pipe lengths and height difference of this product are shown in the
table.
If the units are further apart than this, correct operation cannot be guaranteed.
Total max. length (a+b)
30 m
*1
Max. length for each indoor unit
(a or b)
20 m
Max. height difference between
outdoor unit and each indoor unit
(H1)
15 m
Max. height difference between
indoor units (H2)
10 m
Min. length for each indoor unit
(a or b)
3 m
Total min. length (a+b)
6 m
*1
If the total piping length is longer than 20 m, additional refrigerant charging is
necessary. (For more information, refer to “6.2. Additional charging”.)
SELECTING PIPE SIZES
2. 4. 4.
The diameters of the connection pipes differ according to the capacity of the indoor unit.
Refer to the following table for the proper diameters of the connection pipes between the
indoor and outdoor units.
Capacity of indoor
unit
Gas pipe size
(thickness) [mm]
Liquid pipe size
(thickness) [mm]
7 – 12
ø9.52 (0.8)
ø6.35 (0.8)
14
ø12.7 (0.8)
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.
HEAT INSULATION AROUND CONNECTION PIPES REQUIREMENTS
2. 4. 5.
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 120 °C. (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 15 mm or thicker and if
the expected humidity exceeds 80%, use heat insulation that is 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 20 °C).
Connect the connection pipes according to “4. PIPE INSTALLATION I” in this installation
Manual.
INSTALLATION WORK
3.
Please obtain the approval of the customer when selecting the location of installation and
installing the unit.
Selecting an installation location
3. 1.
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 normally.
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
controller cable at least 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 1 m apart, you could still receive noise under some signal conditions.)
Branch switch and
circuit breaker
Branch switch and
circuit breaker
1m or more
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.
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2011-12-21 11:13:47
