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4. Installing the outdoor unit
B
Min. 18-11/16
23-5/8
Min. 1
Fig. 4-1
5. Installing the refrigerant piping
c1
D
b1
B
H
a1
h1
a2
a3
C
C
h3
Fig. 5-1
Total piping length
Farthest piping length (L) *1
Permissible
Piping length between outdoor unit and branch boxes
length
Farthest branch box from the first joint (b2)
(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
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 The piping specification table does not provide a minimum line set length. However, indoor units with connected piping length less than 16 ft. (5 m) could produce intermit-
tent noise during normal system operation in very quiet environments. Please be aware of this important information when installing and locating the indoor unit within the
conditioned space.
*2 Branch box should be placed within the level between the outdoor unit and indoor units.
6
A
D
E
C
A M10 (3/8") bolt
B Base
C As long as possible
D Vent
E Set deep in the ground
23-5/8
8-7/8
8-7/8
41-11/32
A Outdoor unit
B Branch box
C Indoor unit
D The first joint
L
b2
B
h2
I
a5
a6
a7 a8
a4
C
C
C
C
C
(inch)
• Be sure to install the unit in a sturdy, level surface to prevent rattling noises dur-
ing operation. (Fig. 4-1)
<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 (1-3/16") of the
bottom surface of the base.
• Secure the base of the unit firmly 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
attach 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.
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 ap-
plied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to con-
nect 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 outdoor unit, use only the speci-
fied 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 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 specified above.
• The thicknesses listed in the table above are based on Japanese stand-
ards. Use pipes with a maximum working pressure of 4.15 MPa [601 PSIG]
or higher according to local standards.
c1 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 150 m (492 ft.)
c1 + b2 + a8 ≤ 80 m (262 ft.)
c1 + b1 + b2 ≤ 55 m (180 ft.)
b2 ≤ 30 m (98 ft.)
a8 ≤ 25 m (82 ft.)
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 95 m (311 ft.)
H ≤ 50 m (164 ft.) (In case of outdoor unit is set higher than indoor unit)
H ≤ 40 m (131 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.)
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + b2 +
a6 |, | c1 + b2 + a7 |, | c1 + 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)
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