Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Insulation - Daikin CVXM20A2V1B Installation Manual

6

Piping installation

6.1

Preparing refrigerant piping

6.1.1

Refrigerant piping requirements

NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Refrigerant piping diameter
Use the same diameters as the connections on the outdoor units:
Class
Liquid piping
25+35 Ø6.4
50 Ø6.4
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ 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.
CVXM20+FVXM25~50A2V1B
Split system air conditioners
3P477070-2H – 2020.06
Pipe outer diameter (mm)
Gas piping
Ø9.5
Ø12.7
(a)
Thickness (t)
Ø
≥0.8 mm
Insulation thickness
) (t)
i
≥10 mm
≥13 mm
≥13 mm
6.2

Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING
6.2.1 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.
Minimum is 3 m.
1 Connect refrigerant piping to the unit using flare connections.
2 Insulate the refrigerant piping on the indoor unit as follows:
a
b
a Gas pipe
b Gas pipe insulation
c Liquid pipe
d Liquid pipe insulation
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
3 Close the slit on the refrigerant pipe connection and secure it
with a tape (field supply). Make sure there are no gaps.
4 Wrap the slit and the end of the insulation of the connected
t
refrigerant piping with insulation piece (accessory). Make sure
there are no gaps.
a
c
b
a Refrigerant pipe connection
b Refrigerant piping (field supply)
c Slit
d Tape
e Insulation piece (accessory)
7

Electrical installation

DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least
3 mm between the contact point gaps that provide full
disconnection under overvoltage category III.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
6 Piping installation
c
d
a
a
c
e
d
d
e
b
b
Installation manual
a
b
9