Daikin VRV IV+ RXYTQ8U5YF, Installer And User Manual, Page: 25 / 144

7 | Operation
Installer and user reference guide
25
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
This operation manual is for the following systems with standard control. Before
initiating operation, contact your dealer for the operation that corresponds to your
system type and mark. If your installation has a customised control system, ask
your dealer for the operation that corresponds to your system.
Operation modes (depending on indoor unit type):
▪ Heating and cooling (air to air).
▪ Fan only operation (air to air).
Dedicated functions exist depending on the type of indoor unit, refer to dedicated
installation/operation manual for more information.
7.2 Operation range
Use the system in the following temperature and humidity ranges for safe and
effective operation.
Cooling Heating
Outdoor temperature –5~52°C DB –20~21°C DB
–20~15.5°C WB
Indoor temperature 21~32°C DB
14~25°C WB
15~27°C DB
Indoor humidity ≤80%
(a)
(a)
To avoid condensation and water dripping out of the unit. If the temperature or the
humidity is beyond these conditions, safety devices may be put in action and the air
conditioner may not operate.
Above operation range is only valid in case direct expansion indoor units are
connected to the VRV IV system.
Special operation ranges are valid in case of using AHU. They can be found in the
installation/operation manual of the dedicated unit. Latest information can be
found in the technical engineering data.
7.3 Operating the system
7.3.1 About operating the system
▪ Operation procedure varies according to the combination of outdoor unit and
user interface.
▪ To protect the unit, turn on the main power switch 6 hours before operation.
▪ If the main power supply is turned off during operation, operation will restart
automatically after the power turns back on again.
7.3.2 About cooling, heating, fan only, and automatic operation
▪ Changeover cannot be made with a user interface whose display shows
"change-over under centralised control" (refer to installation and operation
manual of the user interface).
▪ When the display "change-over under centralised control" flashes, refer to
"7.6.1 About setting the master user interface" [
4
30].