Specifications

RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
13
 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 "14. Charging refrigerant" on page 30.
9.4. Selection of refrigerant branch kits
Refrigerant refnets
For piping example, refer to "9.3. Selection of piping size" on
page 12.
 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.
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.
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.
Outdoor unit capacity type (HP) 2 pipes
8-10 KHRQ22M29T9
12-22 KHRQ22M64T
24-42 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
NOTICE
Refrigerant branch kits can only be used with R410A.
(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 of equivalent piping length, not for
refrigerant charge calculations).