Refrigerant Pipe Size And Allowable Length; Selection Of Piping Material; To Select The Piping Size - Daikin VRV W T Serie Manual De Instalación

4 .3 Refrigerant pipe size and allowable
length
NOTE
The refrigerant R410A requires strict cautions for keeping
the system clean, dry and tight.
▪ Clean and dry: foreign materials (including mineral oils
or moisture) should be prevented from getting mixed
into the system.
• Tight: R410A does not contain any chlorine, does not
destroy the ozone layer, and does not reduce earth's
protection against harmful ultraviolet radiation. R410A
can contribute slightly to the greenhouse effect if it is
released. Therefore we should take special attention to
check the tightness of the installation.
4 .3 .1

Selection of piping material

NOTE
Piping and other pressure containing parts shall comply
with the applicable legislation and shall be suitable for
refrigerant. Use phosphoric acid deoxidized seamless
copper for refrigerant.
NOTE
▪ All field piping must be installed by a licensed
refrigeration technician and must comply with relevant
local and national regulations.
▪ After piping work is complete, do not under any
circumstances open
"5.8 Connecting the electrical wiring" on page
"6 Checking of device and installation conditions" on
page 34 are complete.
▪ Do not use flux when brazing the refrigerant piping. Use
the phosphor
(B-Cu93P-710/795 : ISO 3677) which does not require
flux. Flux has extremely negative effect on refrigerant
piping systems. For instance, if the chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the
flux contains fluorine, it will damage the refrigerant oil.
▪ Use only pipes which are clean inside and outside and which do
not accumulate harmful sulfur, oxidants, dirt, cutting oils, moisture,
or other contamination. (Foreign materials inside pipes including
oils for fabrication must be 0.14 gr/10 ft (30 mg/10 m) or less.)
▪ Use the following items for the refrigerant piping.
Material : Jointless phosphor-deoxidized copper pipe.
Size : See "4.3.2 To select the piping
Thickness : Select a thickness for the refrigerant piping which
complies with national and local laws.
▪ For piping work, follow the maximum tolerated length, difference in
height, and length after a branch indicated in the
length requirements" on page
▪ Outside unit multi connection piping kit and refrigerant branch kit
(sold separately) are needed for connection of piping between
outside units (in case of multi system) and piping branches.
▪ Use only separately sold items selected specifically according to
the outside unit multi connection piping kit, the refrigerant branch
kit selection in the "4.3.3 To select refrigerant branch kits" on page
12.
RWEQ96~432TATJU + RWEQ96~432TAYDU
VRV W T-Series water-cooled system air conditioner
4P484115-1A – 2017.10
the stop valve until
copper brazing filler metal
size".
"4.3.7 Piping
15.
4 .3 .2

To select the piping size

INFORMATION
Please select the proper pipe sizes depending on the
mode of your system. There are 2 possible modes:
▪ heat pump,
▪ heat recovery.
Determine the proper size using the following tables and reference
figure (only for indication).
In case of heat pump mode
a
D F
b b
E
1 2 3
1,2,3,4
VRV indoor unit
a,b Indoor branch kit
x,y Outside multi connection kit
In case of heat recovery mode
30.
a
D E
3 4
b
E
1 2
1,2
VRV indoor unit
3 Branch selector unit
4 Cooling only VRV indoor unit
A~E Piping
a,b Indoor branch kit
x,y Outside multi connection kit
A, B, C: Piping between outside unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outside unit
total capacity type, connected downstream.
In case of heat pump mode
Outside unit
capacity type (MBH)
96
120, 144
192, 216
240
264~336
360~432
4 Preparation
B B
A
x
C
y
G
4
B B
A
x
C
y
Piping outer diameter size (inch)
Gas pipe Liquid pipe
7/8
1-1/8
1-3/8
1-5/8
Installation manual
B
B
3/8
1/2
5/8
3/4
11