Space Required Around Unit; Lifting Method And Weight Of Product; Installation Of Unit; Installation - Mitsubishi Electric CITY MULTI PUHY-P-YEM-A Installationshandbuch

4. Space required around unit

[Fig. 4.0.1] (P.2)
<A> Top view
<C> When there is little space up to an obstruction
A Front B No restrictions on wall height (left and right)
C Air outlet guide (Procured at the site)
E Wall height (H)
(mm)
L L
1 2
450 250
(1) Basic space required
A space of at least 250 mm is necessary at the back for inlet air. Taking servicing,
etc. from the rear into account, a space of about 450 mm should be provided, the
same as at the front.
(2) When there is an obstruction above the unit
(3) When inlet air enters from right and left sides of unit
• Wall heights (H) of the front and the rear sides shall be within overall height of
unit.
• When the total height is exceeded, add the "h" dimension of the Fig. 4.0.1 to L
and L .
2

5. Lifting method and weight of product

[Fig. 5.0.1] (P.2)

Caution:

Be very careful to carry product.
- Do not have only one person to carry product if it weighs more than 20 kg.
- PP bands are used to pack some products. Do not use them as a mean for transportation because they are dangerous.
- Do not touch heat exchanger fins with your bare hands. Otherwise you cut your hands.
- Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic packaging bag may suffocate children to death.
- When carrying outdoor unit, be sure to support it at four points. Carrying with 3-point support may make outdoor unit unstable, resulting in it falling.

6. Installation of unit

6.1. Installation

[Fig. 6.1.1] (P.2)
A M10 anchor bolt procured at the site.
• Fix unit tightly with bolts so that unit will not fall down due to earthquake or gust
of wind.
• Use concrete or angle bracket for 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.).
• Be sure that the corners are firmly seated. If the corners are not firmly seated,
the installation feet may be bent.

7. Refrigerant piping installation

Connecting the piping is a terminal-branch type in which refrigerant piping from
the outdoor unit is branched at the terminal and connected to each of the indoor
units.
The method of connection consists of flare connections at the indoor units, flange
connections for the piping of the outdoor unit and flare connections for the liquid
piping. 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 contact with the 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.
7.1. Caution
1 Use the following materials for refrigeration piping.
• Material: Use refrigerant piping made of phosphorus deoxidized copper.
In addition, be sure that the inner and outer surfaces of the pipes are clean
and free of hazardous sulphur, oxides, dust/dirt, shaving particles, oils,
moisture, or any other contaminant.
<B> Side view
D Must be open
F No restrictions on wall height
1
B Corner is not seated.
(4) When unit is surrounded by walls
Note:
• Wall heights (H) of the front and the back sides shall be within overall
height of unit.
• If the panel height is exceeded, add the "h" dimension of the Fig. 4.0.1 to
L and L .
1 2
(mm)
L L
1 2
450 250
Example: When h is 100 mm,
the L dimension becomes 450 + 100 = 550 mm.
1
(5) Collective installation and continuous installation
• Space required for collective installation and continuous installation:
When installing several units, leave the space between each block considering
passage for air and people.
• Open in two directions.
• In case wall height (H) exceeds overall height of unit, add "h" dimension (h =
wall height <H> – overall height of unit) to * marked dimension.
• If there is a wall at both the front and the rear of the unit, install up to four units
consecutively in the side direction and provide a space of 1000 mm or more as
inlet space/passage space for each four units.
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 a strong wind and earth-
quake.
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.
Down piping and down wiring precautions
When down piping and down wiring are performed, be sure that foundation and
base work does not block the base through holes. When down piping is performed,
make the foundation at least 100 mm high so that the piping can pass under the
bottom of 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 radius as big as possible.
5 Always observe the restrictions on the refrigerant piping (such as rated length,
the difference between high/low pressures, and piping diameter). Failure to do
so can result in equipment failure or a decline in heating/cooling performance.
6 The City Multi Series Y will stop due to an abnormality due to excessive or
insufficient coolant. At such a time, always properly charge the unit. When
servicing, always check the notes concerning pipe length and amount of addi-
tional refrigerant at both locations, the refrigerant volume calculation table on
the back of the service panel and the additional refrigerant section on the la-
bels for the combined number of indoor units.
7 Use liquid refrigerant to fill the system.
8 Never use refrigerant to perform an air purge. Always evacuate using a vacuum
pump.
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