Daikin FVXM25A2V1B, Installation Manual

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6 Piping installation
Installation manual
9
C FVXM25~50A
Split system air conditioners
3P477070-2M – 2021.09
d
1×
c
a
b
a Drain pan
b Drain socket
c Drain hose (accessory)
d Screw (accessory)
2 Check for water leaks (see "To check for water leaks" [
4
9]).
3 Insulate the indoor drain socket and drain hose with ≥10 mm
insulation material to prevent condensation.
4 Connect the drain piping to the drain hose. Insert the drain hose
≥50 mm, so it will not be pulled out of the drain pipe.
100
a
≥50
220
150
100
(mm)
c
d
b
a
a Drain hose (accessory)
b Vinyl chloride drain pipe (VP-30) (field supply)
c Reducer (field supply)
d Vinyl chloride drain pipe (VP-20) (field supply)
To check for water leaks
1 Remove the air filters.
2 Gradually pour approximately 1 l of water in the drain pan, and
check for water leaks.
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.
INFORMATION
Additional refrigerant charge is NOT allowed in case of
combination of the outdoor unit
3MXM40N8 or 3MXM52N8
with the indoor units CVXM-A and/or FVXM-A . The total
piping length MUST be ≤30 m.
▪ 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 Pipe outer diameter (mm)
Liquid piping Gas piping
20~35 Ø6.4 Ø9.5
50 Ø6.4 Ø12.7
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ 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")
(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
(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") 12~15 mm ≥13 mm
12.7 mm (1/2") 14~16 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.