10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
Installation and operation manual
11
In case of heat pump system (or 2 pipe):
For the gas piping size: select the size of suction gas piping.
Example:
Downstream capacity for E=capacity index of unit 1
Downstream capacity for D=capacity index of unit 1+capacity index
of unit 2
Piping between BS unit or refrigerant branch kit and indoor
unit: E, G, I
Pipe size for direct connection to indoor unit must be the same as the
connection size of the indoor unit.
When the equivalent pipe length between outdoor and indoor
units is 80 m or more, the size of the main liquid pipe must be
increased. Depending on the length of the piping, the capacity
may drop, but even in such a case it is possible to increase the
size of the main pipe.
1
Outdoor unit
2
Main pipes
3
Increase only liquid pipe size
4
First refrigerant branch kit
5
Indoor unit
Never increase suction gas pipe and HP/LP gas pipe.
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).
In this case, the additional refrigerant calculation has to be
adjusted as mentioned in
"16.3. Calculating the additional
refrigerant charge" on page 31
.
9.4.
Selection of refrigerant branch kits
Refrigerant Refnets
For piping example, refer to
"9.3. Selection of piping size" on
page 10
.
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 (e.g. Refnet joint a).
For Refnet joints other than the first branch (e.g. Refnet joint b),
select the proper branch kit model based on the total capacity
index of all indoor units connected after the refrigerant branch.
Concerning Refnet headers, choose from the following table in
accordance with the total capacity of all the indoor units
connected below the Refnet header.
How to choose a multi outdoor unit connection piping kit
(needed if the outdoor unit capacity type is 16 HP or more).
Choose from the following table in accordance with the number
of outdoor units.
Indoor unit capacity index
Piping outer diameter size (mm)
Suction gas pipe
Liquid pipe
15, 20, 25, 32, 40, 50
12.7
6.4
63, 80, 100, 125
15.9
9.5
200
19.1
250
22.2
Size up
HP Class
Liquid size (mm)
8+10
9.5
→
12.7
16
12.7
→
15.9
18+20+24
15.9
→
19.1
26+30
19.1
→
22.2
Pipe Ø (mm)
Minimal thickness t (mm)
6.4
0.80
9.5
12.7
15.9
0.99
19.1
0.80
22.2
28.6
0.99
34.9
1.21
41.3
1.43
5
4
1
2
3
Outdoor unit capacity
type (HP)
2 pipes
3 pipes
8+10
KHRQ22M29T9
KHRQ23M29T9
16+18+20
KHRQ22M64T
KHRQ23M64T
24+26+30
KHRQ22M75T
KHRQ23M75T
Indoor unit capacity
index
2 pipes
3 pipes
<200
KHRQ22M20T
KHRQ23M20T
200
≤
x<290
KHRQ22M29T9
KHRQ23M29T9
290
≤
x<640
KHRQ22M64T
KHRQ23M64T
≥
640
KHRQ22M75T
KHRQ23M75T
Indoor unit capacity
index
2 pipes
3 pipes
<200
KHRQ22M29H
KHRQ23M29H
200
≤
x<290
KHRQ22M29H
KHRQ23M29H
290
≤
x<640
KHRQ22M64H
(a)
(a) If the pipe size above the Refnet header is Ø34.9 or more, KHRQ22M75H/
KHRQ23M75H is required.
KHRQ23M64H
(a)
≥
640
KHRQ22M75H
KHRQ23M75H
INFORMATION
Maximum 8 branches can be connected to a header.
Multi outdoor unit connection kit
Number of outdoor
units
2
3
Heat pump system
BHFQ22P1007
BHFQ22P1517
Heat recovery system
BHFQ23P907
BHFQ23P1357
NOTICE
Refrigerant branch kits can only be used with R410A.