Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Insulation; Preparing Electrical Wiring - Daikin FDXM35F3V1B Installer's Reference Manual

▪ Protective guards. Make sure to install protective guards on the
suction and discharge side to prevent somebody from touching
the fan blades or heat exchanger.
Do NOT install the unit in the following places:
▪ In places where a mineral oil mist, spray or vapour may be
present in the atmosphere. Plastic parts may deteriorate and fall
off or cause water leakage.
It is NOT recommended to install the unit in the following places
because it may shorten the life of the unit:
▪ Where the voltage fluctuates a lot
▪ In vehicles or vessels
▪ Where acidic or alkaline vapour is present
▪ Use suspension bolts for installation.
▪ Spacing. Mind the following requirements:
≥20
c
A Minimum distance to the floor:
2.7 m to avoid accidental touching.
2.5 m in case the fan is covered (e.g. false ceiling, grille,
...)
a Control box
b Maintenance space
c Ceiling
d Floor surface
e Select the dimension to ensure downward slope of at least
1/100
5.3

Preparing refrigerant piping

5.3.1

Refrigerant piping requirements

INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
Refrigerant piping diameter
Use the same diameters as the connections on the outdoor units:
Class L1 liquid piping
25+35 Ø6.4
50+60 Ø6.4
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
FDXM25~60F3V1B(9)
Split system air conditioners
4P550955-1 – 2018.07
a
≥300
b
≥400
d
(mm)
L1 gas piping
Ø9.5
Ø12.7
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 unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
5.3.2

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.
5.4

Preparing electrical wiring

5.4.1

About preparing electrical wiring

INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
WARNING
▪ If the power supply has a missing or wrong N-phase,
equipment might break down.
▪ Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
▪ Install the required fuses or circuit breakers.
▪ Secure the electrical wiring with cable ties so that the
cables do NOT come in contact with sharp edges or
piping, particularly on the high-pressure side.
▪ Do NOT use taped wires, stranded conductor wires,
extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
▪ Do NOT install a phase advancing capacitor, because
this unit is equipped with an inverter. A phase
advancing capacitor will reduce performance and may
cause accidents.
5 Preparation
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
) (t)
i
≥10 mm
Installer reference guide
9