16 Operation
Installer and user reference guide
63
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
16.4
Adjusting the air flow direction
Refer to the operation manual of the user interface.
16.4.1
About the air flow flap
Double flow+multi-flow units
Corner units
Ceiling suspended units
Wall-mounted units
For the following conditions, a micro computer controls the air flow
direction which may be different from the display.
Cooling
Heating
▪ When the room temperature is
lower
than
the
set
temperature.
▪ When starting operation.
▪ When the room temperature is
higher
than
the
set
temperature.
▪ At defrost operation.
▪ When operating continuously at horizontal air flow direction.
▪ When continuous operation with downward air flow is performed
at the time of cooling with a ceiling-suspended or a wall-mounted
unit, the micro computer may control the flow direction, and then
the user interface indication will also change.
The air flow direction can be adjusted in one of the following ways:
▪ The air flow flap itself adjusts its position.
▪ The air flow direction can be fixed by the user.
▪ Automatic
and desired position .
WARNING
Never touch the air outlet or the horizontal blades while the
swing flap is in operation. Fingers may become caught or
the unit may break down.
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.
16.5
Setting the master user interface
16.5.1
About setting the master user interface
e
b
f
d
b
d
c
a
e
f
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
VRV DX indoor unit
combined with Hydrobox
unit
The operation mode is always forced by
the master user interface of the VRV DX
indoor unit. The Hydrobox unit cannot
select the operation mode (cooling/
heating).
VRV DX indoor units
combined with RA DX
indoor units
The operation mode is by default
selected by the master user interface of
the RA DX indoor unit. Contact your
installer if you wish to know which
indoor unit type received the master
allocation.
16.5.2
To designate the master user interface
(VRV DX and Hydrobox)
In case only VRV DX indoor units (and Hydrobox units) are
connected to the VRV IV system:
1
Press the operation mode selector button of the current master
user interface for 4 seconds. In case this procedure was not yet
performed, the procedure can be executed on the first user
interface operated.
Result:
The display showing
(change-over under
centralised control) of all slave user interfaces connected to the
same outdoor unit flashes.
2
Press the operation mode selector button of the controller that
you wish to designate as the master user interface.
Result:
Designation is completed. This user interface is
designated as the master user interface and the display
showing
(change-over under centralised control)
vanishes. The displays of other user interfaces show
(change-over under centralised control).
16.5.3
To designate the master user interface
(VRV DX and RA DX)
In case VRV DX indoor units and RA DX indoor units are connected
(or only RA DX indoor units)
:
Depending on field setting which was executed on the outdoor unit,
the right for master selection lies with the VRV DX indoor unit or the
RA DX indoor unit (see above).
1
In case the VRV DX indoor unit is assigned as master selector,
the same procedure as above can be followed.
2
In case the RA DX indoor unit is assigned as master selector,
following procedure can be followed.
Procedure: stop all indoor units (VRV DX RA DX indoor
units).
When the system is not operating (all indoor units thermo OFF), you
can define the master RA DX indoor unit by addressing that unit with
infrared user interface (instruct thermo ON in desired mode).
The only way to change the master unit is by repeating the previous
procedure. A cool/heat switchover (or opposite) is only possible by
changing the operation mode of the defined master indoor unit.
