Daikin VRV IV+ Installer And User Reference Manual page 34

5 | Preparation
Installer and user reference guide
34
Outdoor unit capacity type (HP)
8+10
12~22
24~54
▪ For refnet 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.
Indoor unit capacity index
<200
200≤x<290
290≤x<640
≥640
▪ Concerning refnet headers, choose from the following table in accordance with
the total capacity of all the indoor units connected below the refnet header.
Indoor unit capacity index
<200
200≤x<290
290≤x<640
≥640
(a) If the pipe size above the refnet header is Ø34.9 or more, KHRQ22M75H is required.
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose from the
following table in accordance with the number of outdoor units.
Number of outdoor units
2
3
The RYYQ22~54 models, consisting of two or three RYMQ modules, require a 3-
pipe system. There is an additional equalising pipe for such modules (in addition to
the conventional gas and liquid piping). This equalising pipe does not exist for
RYYQ8~20 or RXYQ8~54 units.
The equalising pipe connections for the different RYMQ modules are mentioned in
below table.
RYMQ
8
10~16
18~20
Deciding the equalising pipe diameter:
▪ In case of 3 multi units: the connection diameter of outdoor to Tjoint has to be
kept.
▪ In case of 2 multi units: the connection pipe has to have the largest diameter.
2 pipes
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
KHRQ22M64H
KHRQ22M75H
Branch kit name
BHFQ22P1007
BHFQ22P1517
Equalising pipe Ø (mm)
19.1
22.2
28.6
RYYQ+RYMQ+RXYQ8~20U7Y1B
(a)
VRV IV+ heat pump
4P546228-1A – 2019.10