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WARNING
!
Regulation for refrigerant leakage : the amount of refrigerant
leakage should satisfy the following equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which
Indoor Unit of the least capacity is installed
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
Distribution Method
Line Distribution
2nd
1st
2nd
1st
3rd
1st
Main pipe
Distribution
2nd
Main pipe
Distribution
Vertical Distribution
- Ensure that the branch pipes are attached vertically.
The others
≤00.44 kg/m
3
3
(0.027 lb/ft
)
Branch pipe Fitting
Y branch
A
• Ensure that the branch pipes are attached horizontally or vertically
(see the diagram below.)
3rd main pipe distribution
A
2nd
1st
3rd
• 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.
Header
Header
Ⓐ To Branch Piping or Indoor Unit
B
Ⓑ To Outdoor Unit
Horizontal
plane
Viewed from point A
in direction of arrow
Liquid and gas
Insulator
pipe joints
(included with kit)
Ⓐ To Outdoor Unit
A
Ⓑ To Indoor Unit
• The indoor unit having larger ca-
pacity must be installed closer
to Ⓐ than smaller one.
B
• 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
C
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.
11
Facing
Facing
downwards
upwards
Within +/- 10
Within 3
Within 3
Tape
(field supply)
Insulator for
field piping
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