Installing The Outdoor Unit; Installing The Refrigerant Piping; Precautions For Devices That Use R410A Refrigerant - Mitsubishi Electric MXZ-8B160VA Installationshandbuch

4. Installing the outdoor unit

M10 (3/8") bolt
Base
As long as possible.
Vent
600 Min. 360
Min. 10
Fig. 4-1

5. Installing the refrigerant piping

b1
H
*1
a1
h1
a2 a3
h3
Fig. 5-1
*1 Although two refrigerant pipes are used between the branch box and the Y-shape
connection pipe when connecting the P100 indoor unit, calculate the piping lengths
using only the length of one pipe. (Fig. 5-2)
c1 c2
Fig. 5-2
Total piping length
Farthest piping length (L)
Permissible
length Piping length between outdoor unit and branch boxes
(one-way)
Farthest piping length after branch box (l)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H)*2
Permissible
height differ-
In branch box/indoor unit section (h1)
ence
In each branch unit (h2)
(one-way)
In each indoor unit (h3)
Number of bends
*2 Branch box should be placed within the level between the outdoor unit and indoor units.
6
D
600
175 175
950
Outdoor unit
Branch box
Indoor unit
L
b2
h2
I
a5 a6 a7 a8
a4
Indoor unit [P100 type]
Y-shape connection pipe
a1 = c1 + c2
• Be sure to install the unit in a sturdy, level surface to prevent rattling noises during
operation. (Fig. 4-1)
(mm)
<Foundation specifications>
Foundation bolt
Thickness of concrete
Length of bolt
Weight-bearing capacity
• 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 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 minimize
the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.
Caution:
• Install the unit on a rigid structure to prevent excessive operation sound or
vibration.

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 compounds,
oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with
any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pres-
sure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
ø6.35, ø9.52, ø12.7
ø15.88
• 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.
b1+b2+a1+a2+a3+a4+a5+a6+a7+a8
b2+a8 70 m (b2 55 m, a8
b1+b2 55 m
a8 15 m
a1+a2+a3+a4+a5+a6+a7+a8
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)
h1 + h2 15 m
h2 15 m
h3 12 m
| b1+a1 |, | b1+a2 |, | b1+a3 |, | b1+a4 |, | b1+a5 |, | b2+a6 |, | b2+a7 |, | b2+a8 |
M10 (3/8")
120 mm
70 mm
320 kg
Thickness 0.8 mm
Thickness 1.0 mm
115 m
15 m)
60 m
15