Daikin RYYQ8U7Y1B, Installer And User Manual

Page: 74 / 176

17 | Piping installation
Installer and user reference guide
74
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
Indoor unit capacity index 2 pipes
≥640 KHRQ22M75H
(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 Branch kit name
2 BHFQ22P1007
3 BHFQ22P1517
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 Equalising pipe Ø (mm)
8 19.1
10~16 22.2
18+20 28.6
Deciding the equalising 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 equalising 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 equalising pipe is shown.
Ø22.2 mm Ø28.6 mm Ø19.1 mm
INFORMATION
Reducers or T-joints are field supplied.
NOTICE
Refrigerant branch kits can only be used with R410A.