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8. Installation of unit
8.1. Installation
[Fig. 8.1.1]
A
C
Field-supplied M10 anchor bolt
A
Fixing bracket for the hole-in anchor bolt (3 locations to fix with screws)
C
[Fig. 8.1.2]
Outlet
Inlet
Inlet
H
•
In abnormally harsh environments such as clod and/or windy areas,
sufficient countermeasures to guard against excessive wind and snow
should be taken to ensure the unit's correct operation. When the unit is
expected to operate in cooling mode in conditions under 10°C [50°F], in
snowy areas, in environments subject to strong winds or rain, install air inlet
and outlet ducting as shown in [Fig. 8.1.2].
9. Refrigerant piping installation
The pipe is connected via a terminal-branch type connection in which refrigerant
piping from the outdoor unit is branched at the terminal and is connected to each
of the indoor units.
The method of pipe connection is as follows: flare connection for the indoor
units, gas pipes and liquid pipes for outdoor units, brazed connection. Note that
the branched sections are brazed.
Warning:
Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
- Doing so may cause the unit or pipes to burst, or result in explosion or fire
during use, during repair, or at the time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible
for malfunctions or accidents resulting from the use of the wrong type of
refrigerant.
Always use extreme care to prevent the refrigerant gas from leaking while
using fire or flame. If the refrigerant gas comes in to contact with a flame
from any source, such as a gas stove, it breaks down and generates
a poisonous gas which can cause gas poisoning. Never weld in an
unventilated room. Always conduct an inspection for gas leakage after
installation of the refrigerant piping has been completed.
6
(Unit: mm [in])
B
Corner is not seated.
B
Inlet
•
Fix unit tightly with bolts so that unit will not fall down due to earthquakes or
strong winds.
•
Use concrete base or an angle bracket as the foundation of unit.
•
Vibration may be transmitted to the installation section and noise and
vibration may be generated from the floor and walls, depending on the
installation conditions. Therefore, provide ample vibrationproofing (cushion
pads, cushion frame, etc.).
•
Build the foundation in such way that the corner of the installation leg is
securely supported as shown in the left figure. (Fig. 8.1.1)
When using a rubber isolating cushion, please ensure it is large enough to
cover the entire width of each of the unit's legs. If the corners are not firmly
seated, the installation feet may be bent.
•
When using cushion pads, be sure that the full width of the unit is covered.
•
The projecting length of the anchor bolt should be less than 30 mm [1-3/16 in].
•
Post-installed anchor bolts (i.e., bolts not firmly cemented into the base) are
not compatible with this product unless fixing brackets are first mounted on
the four locations.
Note:
1. Height of frame base for snow damage prevention (H) shall be twice as high
as expected snowfall. Width of frame base shall not exceed that of the unit.
The frame base shall be made of angle steel, etc., and designed so that
snow and wind slip through the structure. (If frame base is too wide, snow
will be accumulated on it.)
2. Install unit so that wind will not directly lash against openings of inlet and
outlet ducts.
3. Build frame base at customer referring to this figure.
Material : Galvanized steel plate 1.2T
Painting : Overall painting with polyester powder
Color
: Munsell 5Y8/1 (same as that of unit)
4. When the unit is used in a cold region and the heating operation is
continuously performed for a long time when the outside air temperature
is below freezing, install a heater to the unit base or take other appropriate
measures to prevent water from freezing on the base.
Warning:
•
Be sure to install unit in a place strong enough to withstand its weight.
Any lack of strength may cause unit to fall down, resulting in a personal
injury.
•
Have installation work in order to protect against strong winds and
earthquakes.
Any installation deficiency may cause unit to fall down, resulting in a
personal injury.
When building the foundation, give full attention to the floor strength, drain water
disposal <during operation, drain water flows out of the unit>, and piping and
wiring routes.
Precautions when routing the pipes and wires below the unit
When routing the pipes and wires below the unit, be sure that the foundation and
base work do not block the base through-holes. Also make sure the foundation is at
least 100 mm [3-15/16 in] high so that the piping can pass under the unit.
9.1. Caution
This unit uses refrigerant R410A. Follow the local regulations on materials and
pipe thickness when selecting pipes. (Refer to the table on page 7.)
1 Use the following materials for refrigeration piping.
•
Material: Use copper alloy seamless pipes made of phosphorus
deoxidized copper. Ensure the inner and outer surfaces of the pipes are
clean and free from hazardous sulfur, oxide, dusts, shaving particles,
oils, and moisture (contamination).
•
Size: Refer to item 9.2. for detailed information on refrigerant piping
system.
2 Always observe the restrictions on the refrigerant piping (such as rated
length, height difference, and piping diameter) to prevent equipment failure
or a decline in heating/cooling performance.
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