Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements - Daikin R32 Split Series Installer's Reference Manual

7 Piping installation

In this chapter

7.1 Preparing refrigerant piping

7.1.1 Refrigerant piping requirements

ARXM50-71+RXM42~71R2V1B + RXP50~71M2V1B + RXA42+50B2V1B +
RXF50+60B2V1B + RXF71A2V1B + RXJ50N2V1B + ARXF50~71A2V1B
R32 split series
4P513661-9J - 2020.05
7.1 Preparing refrigerant piping ...................................................................................................................................................
7.1.1 Refrigerant piping requirements ...........................................................................................................................
7.1.2 Refrigerant piping insulation..................................................................................................................................
7.1.3 Refrigerant piping length and height difference ...................................................................................................
7.2 Connecting the refrigerant piping..........................................................................................................................................
7.2.1 About connecting the refrigerant piping...............................................................................................................
7.2.2 Precautions when connecting the refrigerant piping............................................................................................
7.2.3 Guidelines when connecting the refrigerant piping..............................................................................................
7.2.4 Pipe bending guidelines .........................................................................................................................................
7.2.5 To flare the pipe end..............................................................................................................................................
7.2.6 Using the stop valve and service port....................................................................................................................
7.2.7 To connect the refrigerant piping to the outdoor unit .........................................................................................
7.3 Checking the refrigerant piping..............................................................................................................................................
7.3.1 About checking the refrigerant piping...................................................................................................................
7.3.2 Precautions when checking the refrigerant piping ...............................................................................................
7.3.3 To check for leaks...................................................................................................................................................
7.3.4 To perform vacuum drying ....................................................................................................................................
INFORMATION
Also read the precautions and requirements in the
4
precautions" [
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
RXM71R Ø6.4 mm (1/4")
ARXM71R Ø9.5 mm (3/8")
RXM42R Ø6.4 mm (1/4")
Other Ø6.4 mm (1/4")
▪ Piping temper grade and thickness:
Outer diameter (Ø)
6.4 mm (1/4") Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
(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].
Temper grade
≥0.8 mm
≥1 mm
7 Piping installation
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"2 General safety
Gas piping
Ø15.9 mm (5/8")
Ø15.9 mm (5/8")
Ø9.5 mm (3/8")
Ø12.7 mm (1/2")
(a)
Thickness (t)
Installer reference guide
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Ø
t
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