User Interface; Operation; Operation Range; Operating The System - Daikin VRV 5 RXYA8A7Y1B Installation And Operation Manual

a b
j
c
h
e
d
g
e i
a Heat pump outdoor unit
b Safety valve unit (SV)
c VRV direct expansion (DX) indoor unit
d VRV direct expansion (DX) indoor unit (direct connection
from outdoor to indoor)
e Remote controller in normal mode
f Remote controller in alarm only mode
g Remote controller in supervisor mode (mandatory in
some situations)
h Centralised controller (optional)
i Option PCB (optional)
j Cool/heat changeover remote control switch (optional)
Refrigerant piping
Interconnection and user interface wiring
Direct connection of indoor units to the outdoor unit
5

User interface

CAUTION
▪ NEVER touch the internal parts of the controller.
▪ Do NOT remove the front panel. Some parts inside are
dangerous to touch and appliance problems may
happen. For checking and adjusting the internal parts,
contact your dealer.
This operation manual offers a non-exhaustive overview of the main
functions of the system.
Detailed information on required actions to achieve certain functions
can be found in the dedicated installation and operation manual of
the indoor unit.
Refer to the operation manual of the installed user interface.
6

Operation

6.1

Operation range

Use the system in the following temperature and humidity ranges for
safe and effective operation.
Outdoor temperature
Indoor temperature
Indoor humidity
(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 5 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.
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P739915-1 – 2023.12
c c
e e
f
i i
Cooling Heating
–5~46°C DB –20~20°C DB
–20~15.5°C WB
21~32°C DB 15~27°C DB
14~25°C WB
(a)
≤80%
6.2

Operating the system

6.2.1

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
i
operation.
▪ If the main power supply is turned off during operation, operation
will restart automatically after the power turns back on again.
6.2.2 About cooling, heating, fan only, and
automatic operation
▪ Changeover cannot be made with a user interface whose display
shows "changeover under centralised control" (refer to
installation and operation manual of the user interface).
▪ When the display
flashes, refer to
interface" [ 4 13].
▪ The fan may keep on running for about 1 minute after the heating
operation stops.
▪ The air flow rate may adjust itself depending on the room
temperature or the fan may stop immediately. This is not a
malfunction.
6.2.3

About the heating operation

It may take longer to reach the set temperature for general heating
operation than for cooling operation.
The following operation is performed in order to prevent the heating
capacity from dropping or cold air from blowing.
Defrost operation
In heating operation, freezing of the outdoor unit's air cooled coil
increases over time, restricting the energy transfer to the outdoor
unit's coil. Heating capability decreases and the system needs to go
into defrost operation to be able to remove frost from the outdoor
unit's coil. During defrost operation the heating capacity on the
indoor unit side will temporarily drop until defrosting is completed.
After defrosting, the unit will regain its full heating capacity.
In case of
Multi-use models
(continuous heating)
Single-use models
(non-continuous
heating)
The indoor unit will indicate defrost operation on the display
Hot start
In order to prevent cold air from blowing out of an indoor unit at the
start of heating operation, the indoor fan is automatically stopped.
The display of the user interface shows
before the fan starts. This is not a malfunction.
5 User interface
"changeover under centralised control"
"6.5.1 About setting the master
Then
The indoor unit will continue heating
operation at a reduced level during defrost
operation. It will guarantee a decent comfort
level indoor.
The indoor unit will stop fan operation, the
refrigerant cycle will reverse and energy
from inside the building will be used to
defrost the outdoor unit coil.
. It may take some time
Installation and operation manual
user
.
11