Daikin RXP20M5V1B [5/112] Preparing refrigerant piping
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Daikin RXP20M5V1B [5/112] Preparing refrigerant piping

Daikin RXP20M5V1B [5/112] Preparing refrigerant piping
4 Installation
Installation manual
5
(A)RXP20~35M5V1B
R32 split series
3P519299-5B – 2018.12
a
b
c
c
d
a Snow cover or shed
b Pedestal
c Prevailing wind direction
d Air outlet
In any case, provide at least 300mm of free space below the unit.
Additionally, make sure the unit is positioned at least 100mm above
the maximum expected level of snow. See "4.2 Mounting the
outdoor unit"on page5 for more details.
In heavy snowfall areas it is very important to select an installation
site where the snow will NOT affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is NOT affected by
the snow. If necessary, install a snow cover or shed and a pedestal.
See also
2 4.2 Mounting the outdoor unit [}5]
3.2 Preparing refrigerant piping
3.2.1 Refrigerant piping requirements
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping diameter:
Liquid piping Ø6.4mm (1/4")
Gas piping Ø9.5mm (3/8")
▪ 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") Annealed (O)
(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.
3.2.2 Refrigerant piping length and height
difference
What? Distance
Maximum allowable pipe length 15m
Minimum allowable pipe length 1.5m
Maximum allowable height difference 12m
3.2.3 Refrigerant piping insulation
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
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.
4 Installation
4.1 Opening the units
4.1.1 To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
1×
2
1
2
4.2 Mounting the outdoor unit
4.2.1 To provide the installation structure
Prepare 4 sets of M8 or M10 anchor bolts, nuts and washers (field
supply).
20 mm

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