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Always check the gas density
WARNING
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.
Pay special attention to any location,
such as a basement, etc., where leak-
CAUTION
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.)
Tube branching methods (horizontal use)
Types of vertical trap specifications
(When using ball valve)
Main tubing
Ball valve
(BV: purchased
separately)
Indoor unit (1)
(When not using ball valve)
Main tubing
Branch tubing is
directed upward.
Indoor unit is directed downward
11
B
Horizontal
A
A
line
B
View as seen
from arrow
Arrow view
Indoor unit (more than 2 units)
(If only 1 unit is connected, a ball valve
is also needed on this side.)
Horizontal
Indoor unit
(Each unit is connected
to tubing that is either
level or is directed
downward.)
More than
8 inch
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