• VRV
®
Systems • Outdoor Unit
35
• Outdoor Unit • VRV
®
III heat recovery, with connection to heating only hydrobox • REYAQ-P
11
Installation
11 - 1 Refrigerant Pipe Selection
Selection of piping size
■
Size: determine the proper size referring to following table:
Refnet joint
Branch selector box
1, 2, 3
Indoor unit
4
HXHD indoor unit
A. Piping between outdoor unit and first branch pipe
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:
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:
■
For other indoor units:
Example:
■
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.
■
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:
■
select the pipe size nearest to the required size.
■
use the suitable adapters for the change-over from inch to
mm pipes (field supply).
Selection of refrigerant branch kits
Refrigerant refnets
■
When using refnet joints at the first branch counted from the
outdoor unit side, choose from the following table in accordance
with the capacity of the outdoor unit (example: refnet joint a)
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).
Outdoor unit
capacity type
(Hp)
Piping outer diameter size (mm)
Suction gas
pipe
HP/LP gas pipe
Liquid pipe
10
22.2
19.1
9.5
12
28.6
19.1
12.7
14+16
28.6
22.2
12.7
Indoor unit
capacity index
Piping outer diameter size (mm)
Suction gas
pipe
HP/LP gas pipe
Liquid pipe
<
150
15.9
12.7
9.5
150
≤
x<200
19.1
15.9
9.5
200
≤
x<290
22.2
19.1
9.5
290
≤
x<420
28.6
19.1
12.7
420
≤
x<640
28.6
28.6
15.9
640
≤
x
≤
800
34.9
28.6
19.1
A
B1
B3
a
80
B2
B4
80
B5
20
4
125
b
c
BS
BS
BS
C1
C1
C2
C3
1
2
3
Indoor unit
capacity type
Piping outer diameter size (mm)
HP/LP gas pipe
Liquid pipe
125
12.7
9.5
Indoor unit capacity type
Piping outer diameter size (mm)
Suction gas pipe
Liquid pipe
20, 25, 32, 40, 50
12.7
6.4
63, 80, 100, 125
15.9
9.5
200
19.1
9.5
250
22.2
9.5
Indoor unit
capacity index
Suction gas pipe or
HP/LP gas pipe
(a) HXHD indoor unit
Liquid pipe
C1
80
15.9
9.5
C2
20
12.7
6.4
C3
125
(a)
12.7
(a)
9.5
(a)
Pipe
Ø
Minimal thickness t (mm)
6.4
0.80
9.5
0.80
12.7
0.80
15.9
0.99
19.1
0.80
22.2
0.80
28.6
0.99
34.9
1.21
Outdoor unit
capacity type (Hp)
Refrigerant branch kit name
3 pipes
2 pipes
10
KHRQ23M29T
KHRQ22M29T
12~16
KHRQ23M64T
KHRQ22M64T
4PW62582-1(1)
