Installing The Outdoor Unit; Installing The Refrigerant Piping; Precautions For Devices That Use R410A Refrigerant - Mitsubishi Electric MXZ-8B48NA Manuel D'installation

4. Installing the outdoor unit

M3/8 (M10) bolt
Base
As long as possible.
Vent
Set deep in the ground
23-5/8 Min. 14-6/32
Min. 13/32
Fig. 4-1

5. Installing the refrigerant piping

b1
H
a1
h1
a2 a3 a4
h3
Fig. 5-1
Total piping length
Farthest piping length (L)
Permissible
Piping length between outdoor unit and branch boxes
length
(one-way)
Farthest piping length after branch box (l)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H) *1
Permissible
In branch box/indoor unit section (h1)
height difference
(one-way)
In each branch unit (h2)
In each indoor unit (h3)
Number of bends
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
5.2. Pipe length and height difference (Fig. 5-1)
Flared connections
• This unit has fl ared 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.
6
23-5/8
6-7/8 6-7/8
37-13/32
Outdoor unit
Branch box
Indoor unit
L
b2
h2
I
a5 a6 a7 a8
• Be sure to install the unit in a sturdy, level surface to prevent rattling noises dur-
(inch)
ing operation. (Fig. 4-1)
<Foundation specifi cations>
Foundation bolt
Thickness of concrete
Length of bolt
Weight-bearing capacity
• Make sure that the length of the foundation bolt is within 30 mm (1-3/16") of the
bottom surface of the base.
• Secure the base of the unit fi rmly with four-M10 foundation bolts in sturdy loca-
tions.
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 at-
tach wires, etc., if necessary to install the unit. Use self-tapping screws (ø5 × 15
mm, ø13/16" × 19/32" or less) 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 mini-
mize the risk of damage from earthquakes, typhoons, or strong winds. An
incorrectly installed unit may fall down and cause damage or injuries.

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 ap-
plied to the fl ared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to
connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specifi ed
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 compounds, oxidants, debris,
or dust.
Warning:
When installing or moving the air conditioner, use only the specifi ed refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig-
erant 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 mm (1/4 inch), ø9.52 mm (3/8 inch),
ø12.7 mm (1/2 inch)
ø15.88 (5/8 inch)
• Do not use pipes thinner than those specifi ed above.
b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 115 m (377 ft.)
b2 + a8 ≤ 70 m (230 ft.) (b2 ≤ 55 m (180 ft.), a8 ≤ 15 m (49 ft.))
b1 + b2 ≤ 55 m (180 ft.)
a8 ≤ 15 m (49 ft.)
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 60 m (197 ft.)
H ≤ 30 m (98 ft.) (In case of outdoor unit is set higher than indoor unit)
H ≤ 20 m (66 ft.) (In case of outdoor unit is set lower than indoor unit)
h1 + h2 ≤ 15 m (49 ft.)
h2 ≤ 15 m (49 ft.)
h3 ≤ 12 m (39 ft.)
| b1+a1 |, | b1+a2 |, | b1+a3 |, | b1+a4 |, | b1+a5 |, | b2+a6 |, | b2+a7 |, | b2+a8 | ≤ 15
M10 (3/8")
120 mm (4-23/32")
70 mm (2-3/4")
320 kg (705 lbs)
Thickness 0.8 mm (1/32 inch)
Thickness 1.0 mm (5/128 inch)