Refrigerant Pipe Size And Allowable Pipe Length; Selection Of Piping Material - Daikin KHRQ23M29H Installationsanleitung

9. R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH

9.1. Selection of piping material

NOTICE
Piping and other pressure containing parts shall comply
with the applicable legislation and shall be suitable for
refrigerant. Use phosphoric acid deoxidised seamless
copper for refrigerant.
NOTICE
Installation shall be done by a licensed installer, the choice
of materials and installation shall completely within the
applicable national and international codes.
In Europe the EN 378 is the applicable standard that shall
be used.
Foreign materials inside pipes (including oils for fabrication)
must be ≤30 mg/10 m.
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
NOTICE
HXHD indoor units do not require a branch selector
box (BS box). They only require HP/LP gas and liquid
pipe connections.
Other indoor units need to be connected to a branch
selector box (BS box)(need 3 pipes).
Size: determine the proper size referring to following table:
B1
b
a
A
B3
BS
C1
1 2
80 80
Refnet joint
Branch selector box
1, 2, 3 Indoor unit
4 HXHD indoor unit
Installation manual
11
Temper grade of piping material
O
1/2H
B2
c
B4 B5
BS BS
4
C1 C2 C3
3
20 125
A. Piping between outdoor unit and first branch pipe
Piping outer diameter size (mm)
Outdoor unit
capacity type Suction gas
(Hp) pipe
10 22.2
12 28.6
14+16 28.6
B. Piping between refrigerant branch kits and branch
selector box (BS box)
Choose from the following table in accordance with the indoor
unit total capacity type, connected downstream:
Piping outer diameter size (mm)
Indoor unit Suction gas
capacity index pipe
<150
15.9
150≤x<200 19.1
200≤x<290 22.2
290≤x<420 28.6
420≤x<640 28.6
640≤x≤800 34.9
Example:
Total capacity connected downstream for B1 = capacity index
indoor 2 + capacity index indoor 3 + capacity index indoor 4
= 225
Total capacity connected downstream for B2 = capacity index
indoor 3 + capacity index indoor 4 = 145
Total capacity connected downstream for B3/B4 = capacity index
indoor 1/2 = 80
Total capacity connected downstream for B5 = capacity index
indoor 3 = 20
C. Piping between refrigerant branch kit or branch selector
box and indoor unit
Pipe size for direct connection to indoor unit must be the same
as the connection size of the indoor unit.
For HXHD indoor unit:
Piping outer diameter size (mm)
Indoor unit
capacity type HP/LP gas pipe
125 12.7
For other indoor units:
Indoor unit capacity type Suction gas pipe
20, 25, 32, 40, 50
63, 80, 100, 125
200
250
Example:
Indoor unit Suction gas pipe or
capacity index HP/LP gas pipe
C1 80
C2 20
(a)
C3 125
(a) HXHD indoor unit
HP/LP gas pipe Liquid pipe
19.1 9.5
19.1 12.7
22.2 12.7
HP/LP gas pipe Liquid pipe
12.7 9.5
15.9 9.5
19.1 9.5
19.1 12.7
28.6 15.9
28.6 19.1
Liquid pipe
9.5
Piping outer diameter size (mm)
Liquid pipe
12.7 6.4
15.9 9.5
19.1 9.5
22.2 9.5
(a)
Liquid pipe
15.9 9.5
12.7 6.4
(a) (a)
12.7 9.5
REYAQ10~16P7Y1B
VRVIII system outdoor unit
4PW62582-1A – 08.2011