17 Energy saving and optimum operation
Installer and user reference guide
50
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
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
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.
16.5.2
To designate the master user interface
(VRV DX and Hydrobox)
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).
16.6
About control systems
This system provides two other control systems beside individual
control system (one user interface controls one indoor unit). Confirm
the following if your unit is of the following control system type:
Type
Description
Group control system
1 user interface controls up to 16 indoor
units. All indoor units are equally set.
2 user interface control
system
2 user interfaces control 1 indoor unit (in
case of group control system, 1 group of
indoor units). The unit is individually
operated.
NOTICE
Contact your dealer in case of changing the combination or
setting of group control and 2 user interface control
systems.
17
Energy saving and optimum
operation
Observe the following precautions to ensure the system operates
properly.
▪ Adjust the air outlet properly and avoid direct air flow to room
inhabitants.
▪ Adjust the room temperature properly for a comfortable
environment. Avoid excessive heating or cooling.
▪ Prevent direct sunlight from entering a room during cooling
operation by using curtains or blinds.
▪ Ventilate often. Extended use requires special attention to
ventilation.
▪ Keep doors and windows closed. If the doors and windows remain
open, air will flow out of your room causing a decrease in the
cooling or heating effect.
▪ Be careful not to cool or heat too much. To save energy, keep the
temperature setting at a moderate level.
▪ Never place objects near the air inlet or the air outlet of the unit. It
may cause deterioration in the effect or stop the operation.
▪ Turn off the main power supply switch to the unit when the unit is
not used for longer periods of time. If the switch is on, it consumes
electricity. Before restarting the unit, turn on the main power
supply switch 6 hours before operation to ensure smooth running.
(Refer to "Maintenance" in the indoor unit manual.)
▪ When the display shows
(time to clean the air filter), ask a
qualified service person to clean the filters. (Refer to
"Maintenance" in the indoor unit manual.)
▪ Keep the indoor unit and user interface at least 1 m away from
televisions, radios, stereos, and other similar equipment. Failing to
do so may cause static or distorted pictures.
▪ Do not place items under the indoor unit, they may be damaged
by water.
▪ Condensation may form if the humidity is above 80% or if the
drain outlet gets blocked.
This VRV IV heat recovery system is equipped with advanced
energy saving functionality. Depending on the priority, emphasises
can be put on energy saving or comfort level. Several parameters
can be selected, resulting in the optimal balance between energy
consumption and comfort for the particular application.
Several patterns are available and roughly explained below. Contact
your installer or dealer for advice or to modify the parameters to the
needs of your building.
Detailed information is given for the installer in the installation
manual. He can help you to realize the best balance between energy
consumption and comfort.
17.1
Available main operation methods
Basic
The refrigerant temperature is fixed independent from the situation. It
corresponds to the standard operation which is known and can be
expected from/under previous VRV systems.
Automatic
The refrigerant temperature is set depending on the outdoor ambient
conditions. As such adjusting the refrigerant temperature to match
the required load (which is also related to the outdoor ambient
conditions).
E.g., when your system is operating in cooling, you do not need as
much cooling under low outdoor ambient temperatures (e.g., 25°C)
as under high outdoor ambient temperatures (e.g., 35°C). Using this
idea, the system automatically starts increasing its refrigerant
temperature, automatically reducing the delivered capacity and
increasing the system's efficiency.
Hi-sensible/economic (cooling/heating)
The refrigerant temperature is set higher/lower (cooling/heating)
compared to basic operation. The focus under high sensible mode is
comfort feeling for the customer.
The selection method of indoor units is important and has to be
considered as the available capacity is not the same as under basic
operation.
For details concerning to Hi-sensible applications, please contact
your installer.
