11
ENGLISH
WARNING
Regulation for refrigerant leakage : the amount of refrigerant
leakage should satisfy the following equation for human safety.
If the above equation can not be satisfied, then follow the follow-
ing steps.
- Selection of air conditioning system: select one of the next
1. Installation of effective opening part
2. Reconfirmation of Outdoor Unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)
- Change Indoor Unit type
: installation position should be over 2 m(6.6 ft) from the floor
(Wall mounted type ’ Cassette type)
- Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system
- Limitation in piping work
: Prepare for earthquake and thermal stress
!
Total amount of refrigerant in the system
Volume of the room at which
Indoor Unit of the least capacity is installed
≤00.44 kg/m
3
(0.027 lb/ft
3
)
1st
1st
1st
Main pipe
Distribution
2nd
2nd
3rd
2nd
Main pipe
Distribution
1st
3rd
3rd main pipe distribution
2nd
Vertical Distribution
- Ensure that the branch pipes are attached vertically.
Facing
upwards
Facing
downwards
Within 3 Within 3
Viewed from point A
in direction of arrow
Horizontal
plane
Within +/- 10
A
Insulator
(included with kit)
Liquid and gas
pipe joints
Insulator for
field piping
Tape
(field supply)
Ⓐ To Branch Piping or Indoor Unit
Ⓑ To Outdoor Unit
• Ensure that the branch pipes are attached horizontally or vertically
(see the diagram below.)
• There is no limitation on the joint mounting configuration.
• If the diameter of the refrigerant piping selected by the procedures
described is different from the size of the joint, the connecting sec-
tion should be cut with a pipe cutter.
• Branch pipe should be insulated with the insulator in each kit.
Branch pipe Fitting
Y branch
Header
C
Ⓐ To Outdoor Unit
Ⓑ To Indoor Unit
• The indoor unit having larger ca-
pacity must be installed closer
to Ⓐ than smaller one.
• If the diameter of the refrigerant
piping selected by the proce-
dures described is different
from the size of the joint, the
connecting section should be
cut with a pipe cutter.
ⓒ Pipe cutter
• When the number of pipes to be
connected is smaller than the
number of header branches, in-
stall a cap to the unconnected
branches.
Distribution Method
Line Distribution
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