Specifications

SiBE04-624 Main Functions
Function and Control 27
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Differences on "dehumidification" and "cooling dehumidification" operation
“SARARA” Drying Dry Cooling
Method Puts a pressure reducing device (solenoid valve) in
the center of the heat exchanger of indoor unit to
separate it into upper and lower side. The upper
side acts as a condenser to heat the air.
The heat exchanger in the lower perform the usual
Dry Cooling Operation to make low-temperature
and low-humidity air.
The both types of air are mixed to make moderate-
temperature and low-humidity air for blowing.
As is the cooling mechanism, the Dry Cooling
Operation raises latent heat capacity with
controlling sensible heat capacity by adjusting the
compressor frequency and indoor air flow rate.
Case by case use
for dehumidification
and cooling
dehumidification
As this is a reheating method, it is recommended in
such a case to eliminate humidity without lowering
room temperature as possible
(this is recommended when cooling load is small).
The dry cooling does not use reheating method. In
order to eliminate humidity, it is recommended to
use at the set temperature lowered by several °C
from the room temperature at operation starting up
(this is recommended when cooling load is large).
Mechanism
Humidity adjusting
method
Adjust by operation frequency of the
compressor.
When operation frequency increases, humidity
falls, and when the frequency decreases,
humidity fall is suppressed.
Adjust by operation frequency of the
compressor and indoor air flow rate.
When operation frequency increases and
indoor air flow rate decreases, the humidity
falls. When operation frequency decreases and
the air flow rate increases, humidity fall is
suppressed.
Room temperature
adjusting method
Adjust by outdoor air flow rate.
When outdoor air flow rate increases, room
temperature falls, and when it decreases, room
temperature fall is suppressed.
Adjust by operation frequency of the
compressor.
When operation frequency increases, the room
temperature falls, and when operation
frequency decreases, the room temperature fall
is suppressed.
Thermostat OFF
condition
When room temperature falls.
• Room temp. ≤ preset temp.–2.5
or
• Room temp. preset temp. and the humidity is
lower than target humidity (lower by more than
5%).
When room temperature falls.
• Room temp. ≤ preset temp.–2.0
or
•
Preset temp. – 1.5 < room temp. ≤ preset temp. – 1.0
continues for 10 min.
Thermostat OFF →
ON condition
When thermostat OFF condition is not satisfied • Room temp. preset temp.–0.5
or
Preset temp. – 1.5 < room temp. ≤ preset temp. – 1.0
continues for 10 min.
Time to reach the
target humidity
Approx.1hour consecutive as a standard
(depending on the conditions)
Approx.1hour consecutive as a standard
(depending on the conditions)
Remarks
(FAQ)
The humidity does not decrease.
According to the load conditions of your room,
the temperature sometimes falls and
thermostat ON/OFF repeats. As a result, the
room may not be dehumidified enough.
Set the temperature lower.
The humidity does not decrease. (Thermostat
ON/OFF are repeated.)
As the reheating method is not used, if you set
the temperature close to the room temperature,
thermostat ON/OFF are repeated according the
load conditions of the room. As a result, the
room may not be dehumidified enough. In
cooling dehumidification mode, set the
temperature lower than the room temperature
by several degrees. If you do not want to lower
the room temperature too much, reheating
dehumidification operation method is
recommended.
∗Pressure is reduced by the gap in
the close condition
Solenoid valve for dehumidifying
close∗
open
Heat Exchanger
EV
Heat Exchanger
Outdoor Unit Indoor Unit
Compressor
(R5963)
Outdoor Unit Indoor Unit
openclose∗
Compressor
∗ Depends on the condition
Heat Exchanger
EV
Heat Exchanger
(R5964)