Filter
Top Products
WARNING
Always check the gas density
limit for the room in which the
unit is installed.
1-10. Check of Limit Density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
If the density could exceed the limit level, it is necessary to provide
an opening between the unit and the adjacent room, or to install
mechanical ventilation which is interlocked with a leak detector.
(Total refrigerant charged amount: oz)
(Min. indoor volume where the indoor unit is installed: ft.
3
)
< Limit density 0.3 (oz/ft.
3
)
The limit density of refrigerant R410A which is used in this unit is
0.3 oz/ft.
3
(ISO 5149).
The shipped outdoor unit comes charged with the amount of refrig-
erant fixed for each type, so add it to the amount that is charged in
the field. (For the refrigerant charge amount at shipment, refer to the
unit’s nameplate.)
Minimum indoor volume & floor area as against the amount
of refrigerant is roughly as given in the following table.
00
57
114
170
227
284
341
398
454
511
568
625
682
738
795
852
909
966
1022
1079
1136
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
1000500 1500 2000 2500 3000
Total amount of refrigerant
Min. indoor volume
Min. indoor floor area
(when the ceiling is 8.8 ft. high)
ft.
3
ft.
2
oz
Range above
the density limit of
0.3 oz/ft.
3
(countermeasures
needed)
Range below
the density limit of
0.3 oz/ft.
3
(countermeasures
not needed)
15 to 30°
B
A
B
A
Tube branching methods (horizontal use)
Arrow view
Horizontal
line
View as seen
from arrow
Ball valve
(BV: purchased
separately)
Main tubing
Types of vertical trap specifications
(If only 1 unit is connected, a ball valve
is also needed on this side.)
Indoor unit (1)
(When not using ball valve)
(When using ball valve)
Branch tubing is
directed upward.
(Each unit is connected
to tubing that is either
level or is directed
downward.)
Main tubing
Indoor unit
More than
8 inch
Indoor unit (more than 2 units)
Horizontal
Indoor unit is directed downward
CAUTION
Pay special attention to any location,
such as a basement, etc., where leak-
ing refrigerant can accumulate, since
refrigerant gas is heavier than air.
1-11. Installing Distribution Joint
(1) Refer to “HOW TO ATTACH DISTRIBUTION JOINT” enclosed
with the optional distribution joint kit
(APR-CHP680BA, APR-CHP1350BA, APR-P160BA,
APR-P680BA, APR-P1350BA).
(2) When creating a branch using a commercially available
T-joint (header joint system), orient the main tubing so that it is
either horizontal (level) or vertical. In order to prevent accumu-
lation of refrigerant oil in stopped units, if the main tubing is
horizontal then each branch tubing length should be at an
angle that is greater than horizontal. If the main tubing is verti-
cal, provide a raised starting portion for each branch.
(3) If there are height differences between indoor units or if branch
tubing that follows a distribution joint is connected to only 1
unit, a trap or ball valve must be added to that
distribution joint. (When adding the ball valve, locate it
within 1.3 ft. of the distribution joint.)
If a trap or ball valve is not added, do not operate the sys-
tem before repairs to a malfunctioning unit are
completed. (The refrigerant oil sent through the tubing to
the malfunctioning unit will accumulate and may damage
the compressor.)
14
07-007 W-2WAY_II_NA 1/23/07 6:09 PM Page 14