1-11. Check Of Limit Density; 1-12. Installing Distribution Joint - Panasonic U-72MF1U9 Installation Instructions Manual

Always check the gas density
limit for the room in which the
WARNING
unit is installed.

1-11. 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.

1-12. Installing Distribution Joint

Pay special attention to any
location, such as a basement,
CAUTION
etc., where leaking refrigerant can
accumulate, since refrigerant gas
is heavier than air.
(1) Refer to "HOW TO ATTACH DISTRIBUTION JOINT"
enclosed with the optional distribution joint kit
(CZ-P900PH1U, CZ-P224BH1U, CZ-P680BH1U,
CZ-P1350BH1U).
(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 accumulation 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 vertical, provide a raised
starting portion for each branch.
[Header joint system]
Be sure to solidly weld shut the T-joint end (marked
●
by "X" in the figure). In addition, pay attention to the
insertion depth of each connected tube so that the
flow of refrigerant within the T-joint is not impeded.
When using the header joint system, do not make
●
further branches in the tubing.
Do not use the header joint system on the outdoor unit
●
side.
(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 system 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)
A
B
Header joint system (Indoor)
Outdoor
Indoor
Indoor
Horizontal
line
Indoor
L3 6.56 ft.
Types of vertical trap specifications
(When using ball valve)
Main tubing
Indoor unit (more than 2 units)
Ball valve
(If only 1 unit is connected, a ball
(BV: purchased
valve is also needed on this side.)
separately)
Indoor unit (1)
(When not using ball valve)
Main tubing
Branch tubing is
directed upward.
More than
7–7/8"
Indoor unit is directed downward
12
B
Horizontal A
line
View as seen
from arrow
Arrow view
Install at a
positive angle
Install at a
positive angle
(15 – 30°)
Horizontal Solidly welded
line
shut (X)
Horizontal
Indoor unit
(Each unit is connected
to tubing that is either
level or is directed
downward.)