Installing Distribution Joint; 1-10. Check Of Limit Density - Panasonic U-8ME1E8 Installation Instructions Manual

WARNING

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: kg)
(Min. indoor volume where the indoor unit is installed: m³)
≤ Limit density 0.3 (kg/m³)
The limit density of refrigerant R410A which is used in this unit
is 0.3 kg/m³ (ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant fi xed for each type, so add it to the amount that
is charged in the fi eld. (For the refrigerant charge amount at
shipment, refer to the unit's nameplate.)
Minimum indoor volume & fl oor area as against the amount of
refrigerant is roughly as given in the following table.
3
2
m m
125 337.5
120 324.0
115 310.5
110 297.0
105 283.5
100 270.0
95 256.0
90 243.0
Range below the
85 229.5
density limit of
80 216.0
0.3 kg/m³
75 202.5
(Countermeasures
70 189.0
not needed)
65 175.5
60 162.0
55 148.5
50 135.0
45 121.5
40 108.0
35 94.5
30 81.0
25 67.5
20 54.0
15 40.5
10 27.0
5 13.5
0 0.0
0 10 20 30
Total amount of refrigerant
Pay special attention to any
location, such as a basement,
CAUTION
etc., where leaking refrigerant
can accumulate, since refrigerant
gas is heavier than air.

1-11. Installing Distribution Joint

(1) Refer to "HOW TO ATTACH DISTRIBUTION JOINT"
enclosed with the optional distribution joint kit
(CZ-P680PJ2, CZ-P1350PJ2, CZ-P160BK2, CZ-P680BK2,
CZ-P1350BK2).
(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
Always check the gas density
limit for the room in which the
unit is installed.
Range above the
density limit of 0.3
kg/m³
(Countermeasures
needed)
40 50 60 70 80 90 100
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
40 cm 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.)
Header joint system (Indoor)
Outdoor
Indoor
Types of vertical trap specifications
(When using ball valve)
Main tubing
Ball valve
(BV: purchased
kg
separately)
Indoor unit (1)
(When not using ball valve)
Main tubing
Indoor unit is directed downward
12
B
Horizontal
A
B
line
Arrow view
Install at a
positive angle
Indoor
Install at a
positive angle
(15 – 30°)
Horizontal
line
Indoor
L3 < 2 m
Horizontal Solidly welded
line
shut (X)
Indoor unit (more than 2 units)
(If only 1 unit is connected, a ball valve
is also needed on this side.)
Horizontal (Each unit is connected
Indoor unit to tubing that is either
level or is directed
Branch tubing is
downward.)
directed upward.
More than
20 cm
A
View as seen
from arrow