Figure - Daikin RQYQ140PY1 Installation Manual

(2) To avoid the risk of oil retention in the stopping unit, always
connect the shutoff valve and the piping between outdoor
units as shown in the figure A or figure B.
A
B
Front connections
Prohibited pattern
Front connections
to indoor unit
Side (bottom) connections
to indoor unit
Oil remains in the stopping outdoor unit.
Change to pattern 1 or pattern 2
The explanation is
belows in case of
three multi outdoor
units.
Oil remains in the outdoor unit A
Oil remains in the outdoor unit C
when the system stops.
when the system stops.
Change as shown
Change as shown in the figure below.
in the figure below.
Eliminate difference Eliminate difference
in level
(3) If the piping length between the outdoor units exceeds 2 m,
create a rise of 200 mm or more in the gas line under a length
of 2 m from the outdoor unit multi connection piping kit.
If less than 2m
Between outdoor units
Suction gas pipe
HP/LP gas pipe
to indoor
unit
If 2 m or more
Rising height:
200 mm
Between outdoor units
or more
Suction gas pipe
HP/LP gas pipe
to indoor
unit
less than 2m
English
A
B
Side (bottom) connections
The explanation is
belows in case of
three multi outdoor
units.
Set the rising
in level
Rising
height:
200 mm
or more
less than 2m less than 2m
Rising height:
200 mm
or more
less than 2m
5.
Branching the refrigerant piping
Heed the restrictions below when installing the refrigerant branch-
ing kit and read the installation instruction manual with the kit.
(Improper installation could lead to malfunctioning or breakdown
of the outdoor unit.)
<REFNET joint>
Install the REFNET joint so it splits horizontally or vertically.
(Refer to figure 16)
1. Horizontal surface
2. ±30° or less
3. Horizontal
4. Vertical
<REFNET header>
Install the REFNET header so it splits horizontally.
(Refer to figure 17)
1. Horizontal surface
<Outdoor unit multi connection piping kit>
• Install the joint horizontally so that the attached warning label
faces strait up, and the tilt is within ±15°. (Refer to figure 18-1)
Do not install vertically. (Refer to figure 18-2)
• Maintain a straight portion of 500 mm or more until the split of
the joint without wrapping any onsite piping around this area.
Over 500 mm of straight area can be maintained by connect-
ing at least 120 mm of onsite pipe (straight) to the joint.
(Refer to figure 18-3)
(Refer to figure 18)
1. Warning label
2. Horizontal surface
3. ±15° or less
4. Ground
5. Onsite pipe (120mm length or more)
6. Straight part of 500mm or more
8