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2.
In case of installing multiple units (2 units or more) in lateral
connection per row.
H
Relation of dimensions of H, A and L are shown in the table below.
L
0<L≤1/2H
L≤H
1/2H<L
H<L
Installation impossible
R
EFRIGERANT PIPE SIZE AND ALLOWABLE PIPE
LENGTH
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.
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 R410A piping must be in accordance with the table
below.
Temper grade
Pipe Ø
of piping material
9.5
O
15.9
O
O=Annealed
Installation manual
5
L
A
≥2000
(3000)
≥400 (600)
≥1000
(1500)
A
150 (250)
200 (300)
Minimal thickness t(mm)
0.80
1.00
Refrigerant pipe size
Refer to
figure 3
for twin system, to
figure 5
for double twin system.
Main pipe (pipe between outdoor and first branch).
The pipes should have the same size as the outdoor
connections.
Model
RZQS71~125
Model
RZQS71~125
Pipe between first branch and second branch (L2+L3) (only for
double twin).
Liquid
Ø9.5
Gas
Ø15.9
Pipe between branch and indoor units (L2~L3 for twin, L2~L4 for
triple and L4~L7 for double twin).
These pipe sizes must have the same size as the connected
indoor units pipe sizes. Branch: see marking ' ' on figures 3,
and 5.
Selection of branch pipe
Twin
KHRQ22M20TA
Triple
KHRQ250H
Double twin
KHRQ22M20TA (3x)
figure 4
for triple system and to
Refrigerant pipe size
Gas pipe
Standard size
Ø15.9
Liquid pipe
Standard size
Ø9.5
RZQS71~125B7V3B
Split System air conditioners
4PW32097-1A
4
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