Refrigerant Pipe Size And Allowable Pipe Length - Daikin RZQ-BW1 Installation Manual

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 stop 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
6.4 / 9.5 / 12.7 O
15.9 O
19.1 1/2H
O=Annealed
1/2H=Half hard
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 Size-down
RZQ71 Ø12.7
RZQ100~140 —
Model Size-down
RZQ71~140 Ø6.4
(a) 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).
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.
For new installations, use the standard pipe sizes.
NOTE
When using existing pipes, size-up is allowed as
mentioned in the table above.
Size up is only allowed for pair combination (L1).
Additional restrictions towards allowable pipe
lengths, as mentioned in the table
length" on page
Not using the standard pipe size may result in
capacity
acknowledge this and judge this very carefully in
function of the complete installation.
Selection of branch pipe
Twin KHRQ22M20TA
Triple KHRQ127H
Double twin KHRQ22M20TA (3x)
figure 4 for triple system and to
(a)
Refrigerant pipe size
Gas pipe
Standard size Size-up
Ø15.9
Ø19.1
Liquid pipe
Standard size Size-up
Ø9.5 Ø12.7
"Allowable pipe
6, must be taken into account.
decrease. The installer
RZQ100~140B8
FCQ35~71C / FCQH71C
KHRQ58T
KHRQ58H
KHRQ58T (3x)
RZQ71~140C7V1B + RZQ100~140B8W1B
Split System air conditioners
4PW40417-1
—
4
must
W1B
+