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Operation
Installer and user reference guide
27
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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When stopping the unit, the unit might still operate for a few minutes. This is not
a malfunction.
8.2.2 About cooling, heating, fan only, and automatic operation
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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).
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When the display
"change-over under centralised control" flashes, refer to
"About setting the master user interface"
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The fan may keep on running for about 1 minute after the heating operation
stops.
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The air flow rate may adjust itself depending on the room temperature or the fan
may stop immediately. This is not a malfunction.
8.2.3 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 remove frost from the heat exchanger 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.
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 display
.
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
. It may take some time before the fan starts. This is not a
malfunction.
