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9.
R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH
9.1. Selection of piping material
NOTE
Piping and other pressure containing parts shall
comply with the applicable legislation and shall be
suitable
for
refrigerant.
deoxidised seamless copper for refrigerant.
I
Foreign materials inside pipes (including oils for fabrication)
must be ≤30 mg/10 m.
I
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
Pipe Ø
≤15.9
≥19.1
O = Annealed
1/2H = Half hard
9.2. Selection of piping size
NOTE
I
Heating only indoor units need 2 pipes (liquid and
discharge only).
Indoor units capacity index
EKHBRD011
EKHBRD014
EKHBRD016
I
Size: determine the proper size referring to following table:
B1
a
A
C
1
2
100
100
Refnet joint
A. Piping between outdoor unit and first branch pipe
Outdoor unit
capacity type (Hp)
Discharge gas pipe
8
15.9
10
19.1
12
19.1
14+16
22.2
NOTE
Never increase discharge gas pipe sizes.
Installation manual
11
Use
phosphoric
Temper grade of piping material
O
1/2H
100
125
140
b
C
C
3
140
Piping outer diameter size (mm)
Liquid pipe
9.5
9.5
12.7
12.7
B. Piping between refrigerant branch kits
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream:
Indoor unit
capacity index
<150
150≤x<200
acid
200≤x<290
290≤x<420
420≤x<520
Example:
Total capacity connected downstream for B1 = capacity index
indoor 2 + capacity index indoor 3 = 240
C. Piping between refrigerant branch kit and indoor unit
Pipe size for direct connection to indoor unit must be the same as the
connection size of the indoor unit:
EKHBRD
I
The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Ø
Pipe
6.4
9.5
12.7
15.9
19.1
22.2
28.6
I
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
I select the pipe size nearest to the required size.
I use the suitable adapters for the change-over from inch to
mm pipes (field supply).
Piping outer diameter size (mm)
Discharge gas pipe
12.7
15.9
19.1
19.1
28.6
Piping outer diameter size (mm)
Discharge gas pipe
15.9
Minimal thickness t (mm)
0.80
0.80
0.80
0.99
0.80
0.80
0.99
Daikin Altherma outdoor unit
Liquid pipe
9.5
9.5
9.5
12.7
15.9
Liquid pipe
9.5
EMRQ8~16ABY1
4P501819-1 – 2017.08
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