6
4. Installing the outdoor unit
(mm)
• Be sure to install the unit in a sturdy, level surface to prevent rattling noises during
operation. (Fig. 4-1)
<Foundation specifications>
Foundation bolt
M10 (3/8")
Thickness of concrete
120 mm
Length of bolt
70 mm
Weight-bearing capacity
320 kg
• Make sure that the length of the foundation bolt is within 30 mm of the bottom
surface of the base.
• Secure the base of the unit firmly with four-M10 foundation bolts in sturdy locations.
Installing the outdoor unit
• Do not block the vent. If the vent is blocked, operation will be hindered and break-
down may result.
• In addition to the unit base, use the installation holes on the back of the unit to
attach wires, etc., if necessary to install the unit. Use self-tapping screws (ø5
×
15
mm or more) and install on site.
Warning:
• The unit must be securely installed on a structure that can sustain its weight.
If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.
• The unit must be installed according to the instructions in order to minimize
the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.
Fig. 4-1
A
M10 (3/8") bolt
B
Base
C
As long as possible.
D
Vent
5. Installing the refrigerant piping
5.1. Precautions for devices that use R410A refrigerant
• Refer to page 3 for precautions not included below on using air conditioners
with R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil
applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
specified in the table to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the specified refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refriger-
ant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
ø6.35, ø9.52, ø12.7
Thickness 0.8 mm
ø15.88
Thickness 1.0 mm
• Do not use pipes thinner than those specified above.
5.2. Pipe length and height difference (Fig. 5-1)
Flared connections
• This unit has flared connections on each indoor unit and branch box and outdoor
unit sides.
• Remove the valve cover of the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the branch box and outdoor unit.
Fig. 5-1
Total piping length
b1+b2+a1+a2+a3+a4+a5+a6+a7+a8
≤
115 m
Farthest piping length (L)
b2+a8
≤
70 m (b2
≤
55 m, a8
≤
15 m)
Piping length between outdoor unit and branch boxes
b1+b2
≤
55 m
Farthest piping length after branch box (l)
a8
≤
15 m
Total piping length between branch boxes and indoor units
a1+a2+a3+a4+a5+a6+a7+a8
≤
60 m
In indoor/outdoor section (H)*1
H
≤
30 m (In case of outdoor unit is set higher than indoor unit)
H
≤
20 m (In case of outdoor unit is set lower than indoor unit)
In branch box/indoor unit section (h1)
h1 + h2
≤
15 m
In each branch unit (h2)
h2
≤
15 m
In each indoor unit (h3)
h3
≤
12 m
| b1+a1 |, | b1+a2 |, | b1+a3 |, | b1+a4 |, | b1+a5 |, | b2+a6 |, | b2+a7 |, | b2+a8 |
≤
15
Permissible
length
(one-way)
A
B
C
B
C
C
C
C
C
C
C
L
I
h2
b2
b1
a6
a5
a4
a3
a2
h3
h1
H
a1
a7 a8
A
Outdoor unit
B
Branch box
C
Indoor unit
B
Max.
30
Permissible
height difference
(one-way)
Number of bends
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
A
C
D
600
600
Min. 360
175
175
Min. 10
950
25
330
370
Summary of Contents for MXZ-8A140VA
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