6 Piping installation
Installation Manual
9
FTXF20~42C5V1B
Daikin room air conditioners
3P519299-9X – 2020.12
a
Remove the pipe port cover here for right side piping
b
Remove the pipe port cover here for right-bottom piping
To connect the piping on left side, left-back, or left-
bottom
INFORMATION
The factory default is right-side piping. For left-side piping,
remove the piping from the right side and install it on the
left side.
1
Remove the insulation fixing screw on the right side and
remove the drain hose.
2
Remove the drain plug on the left side and attach it to the right
side.
NOTICE
Do NOT apply lubricating oil (refrigerant oil) to the drain
plug when inserting it. The drain plug may deteriorate and
cause drain leakage from the plug.
3
Insert the drain hose on the left side and do not forget to tighten
it with the fixing screw; otherwise water leakage may occur.
a
b
a
b
a
Insulation fixing screw
b
Drain hose
4
Attach the drain hose to the refrigerant piping bottom side using
adhesive vinyl tape.
A
B
C
b
a
A
Left-side piping
B
Left-back piping
C
Left-bottom piping
a
Remove the pipe port cover here for left-side piping
b
Remove the pipe port cover here for left-bottom piping
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.
▪ 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
L1 liquid piping
L1 gas piping
20~42
Ø6.4
Ø9.5
Refrigerant piping material
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Flare connections:
Only use annealed material.
▪
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
(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
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.
6.2
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
