Daikin RZQS100B7V3B - Refrigerant Pipe Size and Allowable Pipe Length; Refrigerant Pipe Sizing

Installation manual
5
RZQS71~125B7V3B
Split System air conditioners
4PW32097-1A
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.
REFRIGERANT 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 R410A piping must be in accordance with the table
below.
O=Annealed
Refrigerant pipe size
Refer to figure 3 for twin system, to figure 4 for triple system and 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.
■ Pipe between first branch and second branch (L2+L3) (only for
double twin).
■ 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, 4
and 5.
Selection of branch pipe
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)
9.5 O 0.80
15.9 O 1.00
≥
1000
(1500)
≥400
(
600
)
≥
2000
(3000)
A
H
L
Refrigerant pipe size
Gas pipe
Model Standard size
RZQS71~125 Ø15.9
Liquid pipe
Model Standard size
RZQS71~125 Ø9.5
Liquid Ø9.5
Gas Ø15.9
Twin KHRQ22M20TA
Tr iple KHRQ250H
Double twin KHRQ22M20TA (3x)