Installation Of Unit; Installation; Refrigerant Piping Installation; Caution - Mitsubishi Electric CITY MULTI PUHY-HP-YHM-A Serie Manual De Instalación

8. Installation of unit

8.1. Installation

[Fig. 8.1.1] (P.3)
<A> Without detachable leg
A M10 anchor bolt procured at the site.
C Fixing bracket for the hole-in anchor bolt (3 locations to fix with screws).
D Detachable leg
• Fix unit tightly with bolts so that unit will not fall down due to earthquakes or
strong winds.
• Use concrete 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 con-
ditions. Therefore, provide ample vibrationproofing (cushion pads, cushion
frame, etc.).
• Build the foundation in such way that the corner of the installation leg is se-
curely supported as shown in the 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.
• The projecting length of the anchor bolt should be less than 30 mm.
• Hole-in anchor bolts are not compatible with this product. However, if fixing
brackets are mounted on the 4 locations of the unit attachment part, hole-in
anchor bolts can be used.
[Fig. 8.1.2] (P.3)
A Screws
• The detachable leg can be removed at the site.
• Detaching the detachable leg
Loosen the three screws to detach the detachable leg (Two each in the front
and back).
If the base leg finish is damaged when detaching, be sure to repair at the site.

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:
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 poi-
sonous 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.

Caution:

• Do not vent R410A into the atmosphere.
• R410A is a Fluorinated Greenhouse gas, covered by the Kyoto Protocol
with a Global Warming Potential (GWP) = 1975.
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 the right.)
1 Use the following materials for refrigeration piping.
• Material: Use copper alloy seamless pipes made of phosphorus deoxi-
dized 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 sys-
tem.
<B> With detachable leg
B Corner is not seated.
[Fig. 8.1.3] (P.3)
A Inlet
• In abnormally harsh environments such as cold 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, in snowy areas, in environments subject
to strong winds or rain, install air inlet and outlet ducting as shown in
[Fig. 8.1.3].
• When the unit is expected to operate continuously for an extended period of
time in outside temperatures below 0°C, take appropriate measures, such as
the use of a unit base heater, to prevent icing on the unit base.
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 wir-
ing routes.
Precautions when routing the pipes and wires below the unit (Without
detachable leg)
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 high so that the piping can pass under the unit.
2 Commercially available piping often contains dust and other materials. Always
blow it clean with a dry inert gas.
3 Use care to prevent dust, water or other contaminants from entering the piping
during installation.
4 Reduce the number of bending portions as much as possible, and make bend-
ing radii as big as possible.
5 For indoor and outdoor branching, be sure to use the following twinning pipe
sets (sold separately).
Copper pipe size and radial thickness for R410A CITY MULTI.
Size (mm) Size (inch) Radial thickness (mm)
ø6.35 ø1/4"
ø9.52 ø3/8"
ø12.7 ø1/2"
ø15.88 ø5/8"
ø19.05 ø3/4"
ø19.05 ø3/4"
ø22.2 ø7/8"
ø25.4 ø1"
ø28.58 ø1-1/8"
ø31.75 ø1-1/4"
ø34.93 ø1-3/8"
ø41.28 ø1-5/8"
* For pipe sized ø19.05 (3/4") for R410A air conditioner, choice of pipe type is up
to you.
B Outlet
Pipe type
0.8 Type-O
0.8 Type-O
0.8 Type-O
1.0 Type-O
1.2 Type-O
1.0 Type-1/2H or H
1.0 Type-1/2H or H
1.0 Type-1/2H or H
1.0 Type-1/2H or H
1.1 Type-1/2H or H
1.2 Type-1/2H or H
1.4 Type-1/2H or H
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