15
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Operation
Installer and user reference guide
57
FXFQ20~125BVEB
VRV system air conditioner
4P561452-1B – 2021.07
15 Operation
15.1 Operating the system
15.1.1 About operating the system
▪
To protect the unit, turn on the main power switch 6 hours before operation.
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If the main power supply is turned off during operation, operation will restart
automatically after the power turns back on again.
15.1.2 About cooling, heating, fan only, and automatic operation
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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.
15.1.3 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.
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.
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
. It may take some time before the fan starts. This is not a
malfunction.
INFORMATION
▪
The heating capacity drops when the outside temperature falls. If this happens,
use another heating device together with the unit. (When using together with
appliances that produce open fire, ventilate the room constantly). Do not place
appliances that produce open fire in places exposed to the air flow from the unit
or under the unit.
▪
It takes some time to heat up the room from the time the unit is started since the
unit uses a hot-air circulating system to heat the entire room.
▪
If the hot air rises to the ceiling, leaving the area above the floor cold, we
recommend that you use the circulator (the indoor fan for circulating air).
Contact your dealer for details.
