Daikin RZQSG71L3V1B, Installation Manual

Installation manual

5

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

■

Piping and other pressure containing parts shall comply with the
national and international codes and shall be suitable for
refrigerant, use 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

Only use annealed material for flare connections.

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

Installation shall be done by a licensed refrigeration
technician, the choice of materials and installation shall
comply with the applicable national and international
codes. In Europe, EN378 is the applicable standard that
shall be used.

To persons in charge of piping work:

■

Be sure to open the stop valve after piping installing
and vacuuming 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.

≥

1000

(1500)

≥

400 (600)

≥

2000

(3000)

A

H

L

Pipe Ø

Temper grade 

of piping material

Minimal thickness t (mm)

9.5

O

0.80

15.9

O

1.00

Refrigerant pipe size (standard size)

Gas pipe

Ø15.9

Liquid pipe

Ø9.5

Gas

Ø15.9

Liquid

Ø9.5

Twin

KHRQ22M20TA

Triple

KHRQ127H

Double twin

KHRQ22M20TA (3x)