4
FLARED CONNECTIONS
• This unit has flared connections on both indoor and outdoor sides.
• Refrigerant pipes are used to connect the indoor and outdoor units as shown in the figure below.
• Insulate both refrigerant and drain piping completely to prevent condensation.
Limits
Pipe length
20 m max.
Height difference
12 m max.
No. of bends
10 max.
• Refrigerant adjustment … If pipe length exceeds 7 m, additional refrigerant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for 7 m pipe length.)
Pipe length
Up to 7 m
No additional charge is required.
Exceeding 7 m
Additional charge is required.
(Refer to the table below.)
Refrigerant to be added
30 g/m
×
(refrigerant piping length (m) -5)
PIPING PREPARATION
1
Table below shows the specifications of pipes commercially available.
Pipe
Outside diameter
Insulation thickness
Insulation material
For liquid
6.35 mm
8 mm
Heat resisting foam plastic
For gas
9.52 mm
8 mm
0.045 specific gravity
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a
thickness less than 0.8 mm, as the pressure resistance is insufficient.
2
Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
3
Refrigerant pipe bending radius must be 100 mm or more.
Caution:
Be sure to use the insulation of specified thickness. Excessive thickness may cause incorrect installa-
tion of the indoor unit and lack of thickness may cause dew drippage.
4-1
A CASE OF SUSPENDING INDOOR UNIT FROM THE CEILING
4-1-(1)
MOUNTING INSTALLATION PLATE FIXING BOLTS
4. INDOOR UNIT INSTALLATION
1. Determine the locations of installation plate fixing bolts.
• Use installation pattern to determine the locations of instal-
lation plate fixing bolts
J
.
a
Installation pattern
Details are printed on pattern.
Attention:
Surrounding temperature and humidity conditions
may cause paper pattern to shrink or expand.
(Measure dimensions before drilling holes.)
2. Suspension structure (Give site of suspension strong struc-
ture).
■
Wood structure
• Select tie beam (one-story houses) or second-floor
girder (two story houses) as reinforcement member.
• Use sturdy beams of at least 60 mm square for beam
pitch of 900 mm or less or of at least 90 mm square for
beam pitch of 900-1800 mm.
a
Pitch
b
Ceiling
c
Rafter
d
Bracket
e
Roof beam
■
Ferroconcrete Structures
• Secure installation plate fixing bolts
J
as shown at the
right or use angle-stock bracework to install installa-
tion plate fixing bolts
J
.
f
Use inserts rated at 100-150 kg each
g
Steel reinforcing rod
J
Installation plate fixing bolts
3. Installation plate fixing bolts pitch.
• Use the installation plate fixing bolts
J
M10 (
×
4 procure
locally).
a
Indoor unit
b
Air outlet
1
Installation plate
• Projecting dimension of installation fixing bolts
J
from hori-
zontal base line against which you fix installation plate
1
as within at the right.
c
Horizontal base line
1
Installation plate
J
Installation fixing bolts
a
*Remove installation pattern after installation.
b
c
d
e
a
a
b
a
1
300 mm
150 mm
1065 mm
f
J
g
c
J
1
max. 40 mm
