Refrigerant Piping Insulation; Connecting The Refrigerant Piping; Guidelines When Connecting The Refrigerant Piping; To Connect The Refrigerant Piping To The Indoor Unit - Daikin ATXF20E5V1B Installation Manual

Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter Temper grade
(Ø)
6.4 mm (1/4") Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
(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.
6.1.2

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 Insulation inner
(Ø ) diameter (Ø
p
6.4 mm (1/4") 8~10 mm
9.5 mm (3/8") 12~15 mm
12.7 mm (1/2") 14~16 mm
Ø Ø
i i
Ø Ø
p p
t
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.
6.2

Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING
6.2.1 Guidelines when connecting the
refrigerant piping
Take the following guidelines into account when connecting pipes:
▪ Coat the flare inner surface with ether oil or ester oil when
connecting a flare nut. Tighten 3 or 4 turns by hand, before
tightening firmly.
▪ ALWAYS use 2 wrenches together when loosening a flare nut.
▪ ALWAYS use a spanner and torque wrench together to tighten the
flare nut when connecting the piping. This to prevent nut cracking
and leaks.
a b
c
d
ATXF20~42E5V1B
Daikin room air conditioner
3P650253-11H – 2022.10
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
) (t)
i
≥10 mm
≥13 mm
≥13 mm
a Torque wrench
b Spanner
c Piping union
d Flare nut
Piping size Tightening
(mm) torque (N•m)
Ø6.4 15~17
Ø9.5 33~39
6.2.2 To connect the refrigerant piping to the
indoor unit
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
▪ Pipe length. Keep refrigerant piping as short as possible.
1 Connect refrigerant piping to the unit using flare connections.
2 Insulate the refrigerant piping, interconnection cable and drain
hose on the indoor unit as follows:
c
d
a
e
b
f
g
a Gas pipe
b Gas pipe insulation
c Interconnection cable
d Liquid pipe
e Liquid pipe insulation
f Finishing tape
g Drain hose
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
6.3

Checking the refrigerant piping

6.3.1

To check for leaks

NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
NOTICE
ALWAYS use a recommended bubble test solution from
your wholesaler.
NEVER use soap water:
▪ Soap water may cause cracking of components, such
as flare nuts or stop valve caps.
▪ Soap water may contain salt, which absorbs moisture
that will freeze when the piping gets cold.
▪ Soap water contains ammonia which may lead to
corrosion of flared joints (between the brass flare nut
and the copper flare).
1 Charge the system with nitrogen gas up to a gauge pressure of
at least 200 kPa (2 bar). It is recommended to pressurize to
3000 kPa (30 bar) in order to detect small leaks.
2 Check for leaks by applying the bubble test solution to all
connections.
6 Piping installation
Flare Flare shape
dimensions (A) (mm)
(mm)
90°
±2
8.7~9.1
ØA
12.8~13.2
R=
0.4~0.8
Installation manual
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