10
5.2.3 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 the heating operation, as the outdoor temperature
decreases, frost may be formed on the heat exchanger
in the outdoor unit, making it more difficult for the heat
exchanger to heat up the air. The heating capacity
decreases, and a defrosting operation needs to be
performed on the system in order for the system to
provide sufficient heat to the indoor unit. At this point, the
indoor unit will show “dF” on the display screen.
The indoor fan motor will automatically stop running so
as to prevent cold air from coming out of the indoor unit
when the heating operation starts. This process will take
some time. This is not a malfunction.
● In heating mode, the air-conditioning system
absorbs heat from the outdoor air and
releases heat to the indoor side. When the
outdoor temperature is low, less heat is
released. This is the principle of heat pump.
● When the outdoor temperature is extremely
low, the heating capacity of the air conditioner
decreases, and other heating equipment
may need to be added
● The motor in the IDU will continue running
for about 40 seconds to remove residual
heat when the IDU receives a shutdown
command while heating.
INFORMATION
5.2.4 DHW Mode
The general DHW mode may take longer to reach the set
temperature than the cooling and heating modes.
The following operations are carried out to prevent a
decrease in DHW capacity or water temperature from
falling lower than the set temperature
Defrosting
During operation in DHW mode, as the outdoor tempera-
ture decreases, frost may form on the heat exchanger in
the ODU, making it more difficult for the heat exchanger
to heat up the air. The DHW capacity decreases, and
a defrosting operation needs to be performed on the
system so that the system can provide sufficient heat to
the IDU. At this point, the IDU will show "dF" (the defrost
operation) on the display screen.
The operating status of the water pump in the hydraulic
module will change, and the electric heating of the DHW
kit and the hydraulic module will also automatically start.
These measures are all aimed at preventing the outlet
water temperature from falling too low. This process
takes some time. This is not a malfunction.
● In DHW mode, the air conditioning system
absorbs heat from the outdoor air and
releases it into the water system. When
the outdoor temperature is low, less heat is
released. This is the principle of how a heat
pump works.
● When the outdoor temperature is extremely
low, the heating capacity of the air conditioner
decreases, and it may be necessary to turn
on the electric heating of the DHW kit or
hydraulic modules.
INFORMATION
5.2.5 To operate the system
Press the operation mode selector button on the user
interface and select the operation mode.
Auto mode
Cooling mode
Dry mode
Fan mode
Heating mode
DHW modet
Operation
Press the ON/OFF button on the user interface.
Result: The running light turns on and the system starts
to run.
Stop
Press the ON/OFF button on the user interface.
Result: The running light is off, and the system stops
running.
Once the unit has stopped running, do not
disconnect the power immediately. Wait for at
least 10 minutes.
NOTE
Adjus
Refer to the user manual for the controller on how to set the
required temperature, fan speed and air flow direction.
5.3 Dry Program
5.3.1 System operations
The function in this program uses the minimum
temperature drop (minimum indoor cooling) to bring
about a drop in humidity in the room.
The temperature and fan speed cannot be set.
5.4 Cutting off Power Supply
If there is a power outage while the unit is running, the unit
will automatically restart when the power supply resumes.
Misoperation
If misoperation happens, please disconnect the power
from the system and then reconnect it after a few minutes.
5.5 Protection Procedure
5.5.1 Protection Functions
A protection feature prevents the air conditioner from
being activated within 4 minutes when it restarts
immediately after operation.
5.5.2 Protective Equipment
This protective equipment will enable the air conditioner
to stop when the air conditioner is forced to run.
The protective equipment may be activated in the
following circumstances:
Cooling
● The air inlet or air outlet of the ODU is blocked.
● Strong wind is continuously blowing into the air
outlet of the ODU.
Summary of Contents for KMF-80 DVR5
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