Panasonic U-120MF2U9, Technical Data Manual, Page: 61 / 181

Design of 3WAY VRF SYSTEM
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8-1. Installing Distribution Joint
CAUTION
Pay special attention to any location, such as a basement, 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).
When connecting a branch tubing to the indoor unit directly, it is necessary for each branch tubing to install at a positive angle
with respect to horizontal in order to prevent accumulation of refrigerant oil in stopped units. (See the below chart.)
Branch tubing system Restricted
Not restricted
A
B
How to install
branch tubing
When connecting branch tubing to indoor unit directly
When not connecting
branch tubing to indoor
unit directly
Suction tube
* In case of common use solenoid valve kit
Liquid tube / Discharge tube
Suction tube /
Discharge tube /
Liquid tube When connecting to A When connecting to B
Horizontal
A
D
B
15
〜
90°
Straight tubing
length over
8 in. (200mm)
Arrow view D
15
〜
90°
15
〜
30°
Straight tubing
length over
8 in. (200mm)
(Branch tubing
angle)
Horizontal
Straight tubing length
over 8 in. (200mm)
or
0
〜
30°
(Branch tubing
angle)
Horizontal
Vertical
Upward
Vertical
Vertical
Vertical
Vertical
Downward
15
〜
90°
Vertical
Straight tubing
length over
8 in. (200mm)
15
〜
90°
Straight tubing
length over
8 in. (200mm)
Vertical
Vertical
Vertical
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.
Be sure to use a commercial available T-joint.
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.
Header branch system (Main tubing is horizontal.)
Outdoor
Indoor
Indoor
Indoor
(From 1st branch to tip
of solidly welded part)
Horizontal line
Horizontal line
Install at a positive angle
(15~30°)
Install at a positive angle
(15~30°)
Solidly welded shut (X)
6.5 ft. (2m)
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8. Optional Parts
TD831183-00_北米向け3WAY.indb 45 15/12/17 16:05:21