Installation manual
5
RZQ71~12 RZQ100~140B7W1B
Split System air conditioners
4PW21412-1A
2.
In case of installing multiple units (2 units or more) in lateral
connection per row.
Relation of dimensions of H, A and L are shown in the table below.
R
EFRIGERANT
PIPE
SIZE
AND
ALLOWABLE
PIPE
LENGTH
Selection of piping material
■
Construction material: phosphoric acid deoxidised seamless
copper for refrigerant.
■
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
■
The pipe thickness of the refrigerant piping should comply with
relevant local and national regulations. The minimal pipe
thickness for R-410A piping must be in accordance with the
table below.
O=Annealed
1/2H=Half hard
Refrigerant pipe size
■
Pair system
(See figure 2)
■
Simultaneous operation system (twin: see
figure 3
, triple: see
figure 4
, double twin: see
figure 5
)
The pipes between the outdoor unit and the branch (L1) should have
the same size as the outdoor connections. The pipes between the
branch and the indoor units (L2~L5) should have the same size as
the indoor connections. Branch: see marking '
■
' on figures
3
,
4
and
5
.
Allowable pipe length and height difference
See the table below concerning lengths and heights. Refer to figures
2
,
3
,
4
and
5
. Assume that the longest line in the figure corresponds
with the actual longest pipe, and the highest unit in the figure
corresponds with the actual highest unit.
L
A
L
≤
H
0<L
≤
1/2H
150 (250)
1/2H<L
200 (300)
H<L
Installation impossible
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
To persons in charge of piping work:
■
Be sure to open the shut-off valve after piping
installing and vacuming is complete. (Running the
system with the valve closed may break the
compressor.)
■
It is forbidden to discharge refrigerant into the
atmosphere. Collect the refrigerant in accordance
with the freon collection and destruction law.
■
Do not use flux when brazing the refrigerant piping.
For brazing, use phosphor copper brazing filler metal
(BCuP) which does not require a flux.
(If a chlorine flux is used, the piping will corrode, and if
the flux contains fluoride, it will cause the coolant oil to
deteriorate, adversely affecting the coolant piping
system.
Pipe Ø
Temper grade of piping
material
Minimal thickness t(mm)
6.4 / 9.5 / 12.7
O
0.80
15.9
O
1.00
19.1
1/2H
≥
1000
(1500)
≥
400 (600)
≥
2000
(3000)
A
H
L
Refrigerant pipe size
(*)
(*)
In case of twin, triple and double twin applications, the listed refrigerant pipe
sizes relate to the main pipes only. (L1 = the pipes between the outdoor unit and
the branch in figures
3
~
5
).
Gas pipe
Model
Size-down
Standard size
Size-up
RZQ71
Ø12.7
Ø15.9
—
RZQ100~140
—
Ø19.1
Liquid pipe
Model
Size-down
Standard size
Size-up
RZQ71~140
Ø6.4
Ø9.5
Ø12.7
NOTE
Not using the standard pipe size may result in capacity
decrease. It is up to the installer to judge on this
phenomena carefully in function of the complete
installation.
Allowable pipe length
Liquid pipe
size
Model
71
100
125
140
Maximum allowable piping length
(*)
Pair
L1
size-down
10 m (15 m)
standard
50 m
(70 m)
75 m (95 m)
size-up
25 m
(35 m)
35 m (45 m)
• Twin and triple
• Double twin
• L1+L2
• L1+L2+
L4
size-down
10 m (15 m)
standard
50 m
(70 m)
75 m (95 m)
size-up
25 m
(35 m)
35 m (45 m)
Maximum total one-way piping length
Twin
L1+L2+L3
—
60 m
75 m
75 m
Triple
L1+L2+L3
+L4
—
Double twin
L1+L2+L3
+L4+L5+
L6+L7
—
Maximum branch piping length
• Twin and triple
• Double twin
• L2
• L2+L4
—
20 m
