About Cooling, Heating, Fan Only, And Automatic Operation; About The Heating Operation; To Operate The System (Without Cool/Heat Changeover Remote Control Switch); To Operate The System (With Cool/Heat Changeover Remote Control Switch) - Daikin VRV IV RKXYQ8T7Y1B Installation And Operation Manual

12.2.2 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 "12.5.1 About setting the master user
interface" on page 36.
▪ 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.
12.2.3

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 heat exchanger unit's air cooled
coil increases over time, restricting the energy transfer to the heat
exchanger unit's coil. Heating capability decreases and the system
needs to go into defrost operation to be able to deliver enough heat
to the indoor units.
The indoor unit will stop fan operation, the refrigerant cycle will
reverse and energy from inside the building will be used to defrost
the heat exchanger unit coil.
The indoor unit will indicate defrost operation on the displays
.
During defrost operation, ice melts and possibly evaporates.
Possible consequence: Mist might be visible during or directly after
defrost operation. This is not a malfunction.
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
time before the fan starts. This is not a malfunction.
12.2.4 To operate the system (WITHOUT cool/
heat changeover remote control switch)
1 Press the operation mode selector button on the user interface
several times and select the operation mode of your choice.
Cooling operation
Heating operation
Fan only operation
2 Press the ON/OFF button on the user interface.
Result: The operation lamp lights up and the system starts
operating.
RKXYQ5+8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
12.2.5
Overview of the changeover remote control switch
To start
1 Select operation mode with the cool/heat changeover switch as
follows:
Cooling operation
1
2 Press the ON/OFF button on the user interface.
Result: The operation lamp lights up and the system starts
operating.
To stop
. It may take some
3 Press the ON/OFF button on the user interface once again.
Result: The operation lamp goes out and the system stops
operating.
To adjust
For programming temperature, fan speed and air flow direction refer
to the operation manual of the user interface.
12.3
12.3.1
▪ The function of this program is to decrease the humidity in your
room with minimal temperature decrease (minimal room cooling).
▪ The micro computer automatically determines temperature and
fan speed (cannot be set by the user interface).
▪ The system does not go into operation if the room temperature is
low (<20°C).
To operate the system (WITH cool/heat
changeover remote control switch)
a FAN ONLY/AIR CONDITIONING
SELECTOR SWITCH
a
Set the switch to
operation or to
cooling operation.
b COOL/HEAT CHANGEOVER SWITCH
Set the switch to
b
for heating
Heating operation
1
1
NOTICE
Do not turn off power immediately after the unit stops, but
wait for at least 5 minutes.

Using the dry program

About the dry program

Installation and operation manual
12 Operation
for fan only
for heating or
for cooling or to
Fan only operation
1 1
35