8 | Operation
Installer and user reference guide
31
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
NOTICE
▪ The movable limit of the flap is changeable. Contact your dealer for details. (only
for double-flow, multi-flow, corner, ceiling-suspended and wall-mounted).
▪ Avoid operating in the horizontal direction . It may cause dew or dust to
settle on the ceiling or flap.
8.5 Setting the master user interface
8.5.1 About setting the master user interface
a VRV heat pump outdoor unit
b VRV direct expansion (DX) indoor unit
c BP box (required to connect Residential Air (RA) or Sky Air (SA) Direct Expansion
(DX) indoor units)
d Residential Air (RA) Direct Expansion (DX) indoor units)
e User interface (dedicated depending on indoor unit type)
f User interface (wireless, dedicated depending on indoor unit type)
When the system is installed as shown in the figure above, it is necessary to
designate one of the user interfaces as the master user interface.
The displays of slave user interfaces show (change-over under centralised
control) and slave user interfaces automatically follow the operation mode
directed by the master user interface.
Only the master user interface can select heating or cooling mode.
Indoor unit master allocation is determined as follows in special cases:
Case Description
VRVDX indoor unit combined
with Hydrobox unit
The operation mode is always forced by the
master user interface of the VRVDX indoor unit.
The Hydrobox unit cannot select the operation
mode (cooling/heating).
VRVDX indoor units combined
with RADX indoor units
The operation mode is by default selected by
the master user interface of the RADX indoor
unit. Contact your installer if you wish to know
which indoor unit type received the master
allocation.
8.5.2 To designate the master user interface (VRV DX and Hydrobox)
In case only VRVDX indoor units (and Hydrobox units) are connected to the VRV IV
system:
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