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Installation manual
5
RZQ71~12 RZQ100~140B8W1B
Split System air conditioners
4PW23691-1A
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 R410A piping must be in accordance with the table
below.
O=Annealed
1/2H=Half hard
Refrigerant pipe size
Refer to
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
,
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)
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
(a)
(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
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
Liquid
Ø9.5
Gas
Ø15.9
NOTE
■
For new installations, use the standard pipe sizes.
■
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
lenghts, as mentioned in the table
, must be taken into account.
Not using the standard pipe size may result in
capacity decrease. The installer must
acknowledge this and judge this very carefully in
function of the complete installation.
Twin
KHRQ22M20TA
Triple
KHRQ250H
Double twin
KHRQ22M20TA (3x)