1-11. Installing Distribution Joint - Panasonic U-4LE1E5 Installation Instructions Manual

Minimum indoor volume & floor area relative to the amount of
refrigerant are roughly as given in the following table.
2 3
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
85 229.5
Range below the
80 216.0
density limit of 0.3 kg/m³
75 202.5
(Countermeasures not
70 189.0
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
CAUTION
Pay special attention to any location, such as a basement,
etc. where leaking refrigerant can accumlate, 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-P160BK2).
(2) 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.
(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 (field supply) 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 (field supply) 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)
B
AMP Air Conditioning
Range above the
density limit of 0.3 kg/m³
(Countermeasures needed)
20 30 40 50 60 70 80
Total amount of refrigerant
B
A
Horizontal
A
View as seen from
line
arrow
Arrow view
Types of vertical trap specifications
(When using ball valve (field supply))
Ball valve
(BV: field supply)
(When not using ball valve)
Main tubing
Indoor unit is directed downward
90 100 kg
1-12. Optional Distribution Joint Kit
See the installation instructions packaged with the distribution
joint kit for the installation procedure.
Table 1-11
Model name
CZ-P160BK2
CZ-P160BK2
Use: For indoor unit (Capacity after distribution joint is 22.4 kW or less.)
Example
Gas tube
Distribution joint
Insulation
Table 1-12 Size of connection point on each part
(shown are inside diameters of tubing)
Size Part A
mm ø19.05
9
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Main tubing
Indoor unit (more than 2 units)
(If only 1 unit is connected, a ball
valve is also needed on this side.)
Indoor unit (1)
Horizontal (Each unit is
Indoor unit connected to
tubing that is either
Branch tubing is
level or is directed
directed upward.
downward.)
More than
20 cm
Cooling capacity
after distribution
22.4 kW or less
Liquid tube
Distribution
joint
Insulation
Part B Part C Part D
ø15.88 ø12.7
Remarks
For indoor unit
Part E
ø9.52 ø6.35
Unit: mm