About Cooling, Heating, Fan Only, And Automatic Operation; About The Heating Operation - Daikin VRV IV+ RYYQ14U7Y1B Series Installer And User Manual

8.2.2 About cooling, heating, fan only, and automatic operation

8.2.3 About the heating operation

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1B – 2020.10
▪ 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
"About setting the master user
▪ 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.
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.
If
RYYQ or RYMQ outdoor
unit is installed
RXYQ outdoor unit is
installed
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
malfunction.
"change-over under centralised control" flashes, refer to
4
interface" [ 31].
The indoor unit will continue heating operation at a
reduced level during defrost operation. It will
guarantee a decent comfort level indoor. A heat
storage element in the outdoor unit will provide the
energy to de-ice the outdoor unit's air cooled coil
during defrost operation.
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 before the fan starts. This is not a
8 Operation
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Then
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Installer and user reference guide
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