Daikin RXF71A2V1B, Installation Manual

Page: 16 / 28

5 Piping installation
Installation manual
16
ARXM50-71+RXM42~7 RXP50~7
RXA42+5 RXF50+6 RXF7
RXJ5 ARXF50~71A2V1B
R32 split series
3P512025-9S – 2020.05
c Drain plug
d Hose (field supply)
To close the drain holes and attach the drain
socket
NOTICE
In cold areas, do NOT use a drain socket, hose and caps
(1, 2) with the outdoor unit. Take adequate measures so
that the evacuated condensate CANNOT freeze.
1 Install drain caps 1 and 2 (accessory). Make sure the edges of
the drain caps close off the holes completely.
a b
a Bottom frame
b Drain cap
2 Install the drain socket.
a c b b b
a
a
a Drain hole. Install a drain cap (2).
b Drain hole. Install a drain cap (1).
c Drain hole for drain socket
5 Piping installation
5.1 Preparing refrigerant piping
5.1.1 Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping diameter:
Models Liquid piping Gas piping
RXM71R Ø6.4 mm (1/4") Ø15.9 mm (5/8")
ARXM71R Ø9.5 mm (3/8") Ø15.9 mm (5/8")
RXM42R Ø6.4 mm (1/4") Ø9.5 mm (3/8")
Other Ø6.4 mm (1/4") Ø12.7 mm (1/2")
▪ Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O) ≥0.8 mm
t
Ø
15.9 mm (5/8") ≥1 mm
(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.
5.1.2 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") 10~14 mm ≥13 mm
12.7 mm (1/2") 14~16 mm ≥10 mm
15.9 mm (5/8") 16~20 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.
5.1.3 Refrigerant piping length and height
difference
What? Distance
Maximum allowable pipe length 30 m
Minimum allowable pipe length 3 m
Maximum allowable height distance 20 m
5.2 Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
CAUTION
▪ No brazing or welding on site for units with R32
refrigerant charge during shipment.
▪ During installation of the refrigeration system, joining of
parts with at least one part charged shall be performed
taking into account the following requirements:
ð
inside occupied spaces non permanent joints are not
allowed for R32 refrigerant except for site made joints
directly connecting the indoor unit to piping. Site made
joints directly connecting piping to indoor units shall
be of non permanent type.
WARNING
▪ Only use R32 as refrigerant. Other substances may
cause explosions and accidents.
▪ R32 contains fluorinated greenhouse gases. Its global
warming potential (GWP) value is 675. Do NOT vent
these gases into the atmosphere.
▪ When charging refrigerant, ALWAYS use protective
gloves and safety glasses.
5.2.1 To connect the refrigerant piping to the
outdoor unit
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical
damage.