14 Electrical installation
Installation and operation manual
19
EKVDX32~100A2VEB
VRV system air conditioner
4P555815-1A – 2021.08
Refrigerant piping diameter
For piping connections of the indoor unit use the following piping
diameters.
Model
Pipe outer diameter (mm)
R410A
R32
(a)
Gas
Liquid
Gas
Liquid
EKVDX32A2
Ø12.70
Ø6.35
Ø9.52
Ø6.35
EKVDX50A2
Ø12.70
Ø6.35
Ø12.70
Ø6.35
EKVDX80A2
Ø15.90
Ø9.52
Ø12.70
Ø6.35
EKVDX100A2
Ø15.90
Ø9.52
Ø15.90
Ø9.52
(a)
For R32 refrigerant, accessory pipes may be required for certain
units. Accessory pipes are supplied with the unit.
Refrigerant piping material
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Flare connections:
Only use annealed material.
▪
Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
Annealed (O)
≥0.8 mm
t
Ø
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
13.1.2
Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4 mm (1/4")
8~10 mm
≥10 mm
9.5 mm (3/8")
10~14 mm
≥13 mm
12.7 mm (1/2")
14~16 mm
≥13 mm
15.9 mm (5/8")
16~20 mm
≥13 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
13.2
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
13.2.1
To connect the refrigerant piping to the
indoor unit
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
▪
Pipe length
. Keep refrigerant piping as short as possible.
▪
Flare connections
. Connect refrigerant piping to the unit using
flare connections.
▪
Insulation
. Insulate the refrigerant piping on the indoor unit as
follows:
B
A
a
d
c
e f
b
b
a
d
c
e f
b
b
2
4
3
g
1
2
3
4
g
1
A B
A
Liquid piping
B
Gas piping
a
Insulation material (field supply)
b
Tie wrap (field supply)
c
Insulation tubes: Large (gas pipe), small (liquid pipe)
(accessories)
d
Flare nut (attached to the unit)
e
Refrigerant pipe connection (attached to the unit)
f
Unit
g
Sealing pads: gas pipe, liquid pipe (accessories)
1
Turn up the seams of the insulation pieces.
2
Attach to the base of the unit.
3
Tighten the tie wrap on the insulation pieces.
4
Wrap the sealing pad from the base of the unit to the top
of the flare nut.
In case of R32 refrigerant, for some connections an auxiliary pipe
(accessory) must be installed and insulated using the correct
insulation tube (accessory):
Model
Auxiliary pipe / insulation tube (mm)
Gas
Liquid
EKVDX32A2
Ø12.7/Ø13-29 (L65)
—
EKVDX50A2
—
—
EKVDX80A2
Ø15.9/Ø15-31 (L70)
Ø9.5/Ø10-26 (L65)
EKVDX100A2
—
—
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
14
Electrical installation
CAUTION
See
"2 Specific installer safety instructions"
5] to make
sure this installation complies with all safety regulations.
