Daikin FTXF20A2V1B - Refrigerant Piping Insulation; Preparing Electrical Wiring; About Preparing Electrical Wiring

5 | Preparation
Installer reference guide
21
FTXP50~71M2V1B + FTXF20~71A2V1B + ATXF50~71A2V1B
Daikin room air conditioner
4P513661-8H – 2019.12
Class L1 liquid piping L1 gas piping
20~35 Ø6.4 Ø9.5
50~71 Ø6.4 Ø12.7
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
9.5mm (3/8")
12.7mm (1/2")
(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.
5.3.2 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.
5.4 Preparing electrical wiring
5.4.1 About preparing electrical wiring
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.