Figure - Daikin REYQ18PY1 Installation Manual

• 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 16-3)
(Refer to figure 16)
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
7. C-arrow view
8. D-arrow view
(2) The piping between outdoor units must be installed level
(Pattern 1) or with a rise (Pattern 2). Otherwise oil may pool
in the pipes.
Pattern 1
Front connections
to indoor unit
Piping between outdoor units
Level
Side (bottom) connections
to indoor unit
Piping between outdoor units
Pattern 2
Front connections
to indoor unit
Rise
Side (bottom) connections
to indoor unit
Change to pattern 1 or pattern 2
Prohibited pattern
Front connections
Downward
to indoor
inclination
unit
Downward inclination
Side (bottom) connections
to indoor unit
Downward inclination
(3) To avoid the risk of oil detention in the stopping unit, always
connect the shutoff valve and the piping between outdoor
units as shown A or B in the figure below.
A
B
Front connections
English
Unit Unit Unit
A B C
Unit Unit Unit
A B C
Unit Unit Unit
A B C
Rise
Unit Unit Unit
A B C
Rise
Oil remains in piping
Unit Unit Unit
A B C
Unit Unit Unit
A B C
A
B
Side (bottom) 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
Unit Unit Unit
B C A
Unit
A
Oil remains in the unit B
when system stops.
Change as shown
in the figure below.
Connect straightly Connect straightly
Unit Unit Unit
B C A
Unit
A
(4) If the piping length between the outdoor units exceeds 2 m,
create a rise of 200 mm or more in the suction gas and HP/
LP gas piping under a length of 2 m from the outdoor unit
multi connection piping kit.
If less than 2m
Suction gas pipe and
HP/LP gas pipe
between outdoor units
to indoor unit
If 2 m or more
Suction gas pipe and
HP/LP gas pipe
between outdoor units
to indoor unit
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 14)
1. Horizontal
2. A-arrow view
3. Horizontal surface
4. ±30° or less
5. Vertical
<REFNET header>
Install the REFNET header so it splits horizontally.
(Refer to figure 15)
1. Horizontal surface
2. B-arrow view
Unit A Unit A Unit B Unit C
Unit A Unit B Unit C
Unit Unit Unit
B A B
Unit
C
Oil remains in the unit B
when system stops.
Change as shown
in the figure below.
Put rising
Unit Unit Unit
B A B
Unit
C
Rising height :
200 mm or more
Unit Unit Unit
A B C
less than 2m
Rising height : Rising height :
Unit Unit
200 mm or more 200 mm or more
A B
less than 2m less than 2m
Unit
C
Unit
C
Unit
C
6