Installation and operation manual
13
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
9.4.
Selection of refrigerant branch kits
Refrigerant refnets
For piping example, refer to
"9.3. Selection of piping size" on
page 11
.
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).
For refnets joints other than the first branch (example 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 an outdoor multi connection piping kit (needed if
the outdoor unit capacity type is 22 HP or more). Choose from
the following table in accordance with the number of outdoor
units.
The RYYQ22~54 models, consisting of two or three RYMQ modules,
require a 3-pipe system. There is an additional equalizing pipe for
such modules (in addition to the conventional gas and liquid piping).
This equalizing pipe does not exist for RYYQ8~20 or RYXQ8~54
units.
The equalizing pipe connections for the different RYMQ modules are
mentioned in below table.
Deciding the equalizing pipe diameter:
In case of 3 multi units: the connection diameter of outdoor to
T-joint has to be kept.
In case of 2 multi units: the connection pipe has to have the
largest diameter.
There is never a connection of the equalizing pipe with the indoor
units.
Example (free multi combination): RYMQ8+RYMQ18.
Largest connection is Ø28.6 (RYMQ18); Ø22.2 (RYMQ12) and
Ø19.1 (RYMQ8). In figure below only equalizing pipe is shown.
9.5.
System piping (length) limitations
9.5.1.
Piping length restrictions
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable level difference and
allowable length after branching as indicated below. Three patterns
will be discussed, including VRV DX indoor units combined with
Hydrobox units or RA DX indoor units.
Definitions
Actual piping length: pipe length between outdoor
(1)
and indoor units.
Equivalent piping length
(2)
: pipe length between outdoor
(1)
and
indoor units.
Total piping length: total piping length from the outdoor
(1)
to all indoor
units.
Difference in height between outdoor and indoor units: H1.
Difference in height between indoor and indoor units: H2.
Difference in height between outdoor and outdoor units: H3.
Difference in height between outdoor and BP unit: H4.
Difference in height between BP unit and BP unit: H5.
Difference in height between BP unit and RA DX indoor unit: H6.
Outdoor unit capacity type (HP)
2 pipes
8-10
KHRQ22M29T9
12-22
KHRQ22M64T
24-54
KHRQ22M75T
Indoor unit capacity index
2 pipes
<200
KHRQ22M20T
200
≤
x<290
KHRQ22M29T9
290
≤
x<640
KHRQ22M64T
≥
640
KHRQ22M75T
Indoor unit capacity index
2 pipes
<200
KHRQ22M29H
200
≤
x<290
KHRQ22M29H
290
≤
x<640
KHRQ22M64H
(a)
(a) If the pipe size above the refnet header is Ø34.9 or more, KHRQ22M75H is
required.
≥
640
KHRQ22M75H
INFORMATION
Maximum 8 branches can be connected to a header.
Number of outdoor units
Branch kit name
2
BHFQ22P1007
3
BHFQ22P1517
RYMQ
Equalizing pipe Ø (mm)
8
19.1
10
22.2
12
14
16
18
28.6
20
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.
INFORMATION
Equalizing pipe for RYMQ has to be connected between
the outdoor modules of multi continuous heating models:
RYYQ22~54 consisting of 2 or 3 RYMQ8~20 modules. The
equalizing pipe should never have a connection to any
indoor unit.
(1)
If the system capacity is >20HP, re-read "the first outdoor branch as seen
from the indoor unit".
(2)
Assume equivalent piping length of refnet joint=0.5 m and refnet
header=1 m (for calculation purposes).
Ø22.2 mm
Ø28.6 mm
Ø19.1 mm
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