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Design of 3-WAY FLOW LOGIC
■
■
Installing distribution joint
(1) Refer to “HOW TO ATTACH DISTRIBUTION
JOINT” enclosed with the optional distribution
joint kit (NRFO-3DL68, NRFO-3D68135,
NRF-DL 22, NRF-D 2268, NRF-D 68135).
(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 must
be added to that distribution joint. (When adding
the ball valve, locate it within 40 cm of the distribu-
tion joint.)
(Consult with AIRWELL separately concerning the
ball valve.)
If a trap or ball valve is not added, do not oper-
ate the system before repairs to a malfunction-
ing unit are completed. (The refrigerant oil sent
through the tubing to the malfunctioning unit
will accumulate and may damage the compres-
sor.)
15 to 30
°
B
A
B
A
Tube branching
methods
(horizontal use)
Arrow view
Horizontal
line
View as seen
from arrow
Ball valve
(BV: purchased
separately)
Main tubing
Types of vertical trap specifications
(If only 1 unit is connected, a ball
valve is also needed on this side.)
Indoor unit (1)
(When not using ball valve)
(When using ball valve)
Branch tubing is
directed upward.
(Each unit is
connected to tubing
that is either level or
is directed
downward.)
Main tubing
Indoor unit
More than
20 cm
Indoor unit (more than 2 units)
Horizontal
Indoor unit is directed downward
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