Installation and operation manual
10
10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
1
Front side
2
Hole for a foundation bolt
(Ø17 holes at 4 corners)
3
Avoid foundations that support the unit at 4 corner points.
9.
Refrigerant pipe size and allowable
pipe length
9.1.
General information
9.2.
Selection of piping material
Foreign materials inside pipes (including oils for fabrication)
must be
≤
30 mg/10 m.
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
9.3.
Selection of piping size
Determine the proper size referring to following tables and reference
figure (only for indication).
1,2
VRV DX indoor unit
3
BS unit
a,b,c
Indoor branch kit
x,y
Multi outdoor unit connection kit
Piping between outdoor unit and (first) refrigerant branch kit:
A, B, C
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Piping between refrigerant branch kits: D
Piping between refrigerant branch kit and BS unit: F
Piping between BS unit and refrigerant branch kit: H
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the connection
piping exceed the refrigerant piping size chosen by the general
system model name.
NOTICE
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.
NOTICE
Piping and other pressure containing parts shall comply
with the applicable legislation and shall be suitable for
refrigerant. Use phosphoric acid deoxidised seamless
copper for refrigerant.
NOTICE
Installation shall be done by a licensed installer, the choice
of materials and installation shall conform completely with
the applicable national and international codes.
In Europe, EN 378 is the applicable standard that shall be
used.
Pipe Ø (mm)
Temper grade of piping material
≤
15.9
O (annealed)
≥
19.1
1/2H (half hard)
1
2
3
744
400
80
80
INFORMATION
In case of heat recovery system:
Use 3 pipes (suction gas, HP/LP gas, liquid).
In case of heat pump system:
Use 2 pipes (gas and liquid).
In case of gas pipe in heat pump system
Select the piping size in accordance with the suction
gas piping size.
No BS unit can be used in case of heat pump system.
Outdoor unit
capacity type
(HP)
Piping outer diameter size (mm)
Suction gas
pipe
Liquid pipe
HP/LP gas pipe
8
19.1
9.5
15.9
10
22.2
19.1
16
28.6
12.7
22.2
18+20
15.9
24
34.9
19.1
28.6
26+30
Indoor unit
capacity index
Piping outer diameter size (mm)
Suction gas
pipe
Liquid pipe
HP/LP gas pipe
<150
15.9
9.5
12.7
150
≤
x<
200
19.1
15.9
200
≤
x<290
22.2
19.1
290
≤
x<420
28.6
12.7
420
≤
x<640
15.9
28.6
640
≤
x<920
34.9
19.1
≥
920
41.3
A
B
B
B
C
D
F
E
x
y
b
a
3
1
2
G
1
2
c
H
F
3
1
I
