General Functionality
Si04-115
40
Main Function
1.19
Dew Condensation Sweating Prevention Function
Outline
During Cooling/Dry operation, when the heat exchanger’s temperature falls down excessively,
the capacity supply will be reduced (frequency step down) so as to prevent dew formation
around a discharge grille caused by a excessive capacity supply to an indoor unit.
Processing
1. Conditions of beginning/ending for this function.
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Operation mode is in Cooling/Dry.
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Compressors operate.
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Fan speed < MH tap
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Outdoor temperature
≤
32°C
Dew condensation sweating prevention function will start, if
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are under the
simultaneous condition with AND.
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Operation mode is not in Cooling/Dry.
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Compressors stop
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MH tap
≤
fan speed
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Outdoor temperature > 32°C
Dew condensation sweating prevention function will be completed if
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are under the
coordinate condition with OR.
2. Control details
"
It controls the operation frequency in accordance with the temperature zone in the step
down area ~ the return area which are set in every model.
"
Frequency limitation by means of freeze protection control will not be carried out in the return
area.
"
Frequency is increased approximately every 2 Hz/min. in the up-area.
"
Frequency alteration will not be conducted in the steady area.
"
Frequency - down is carried out in the step down area approximately every 2 ~ 4 Hz/min.
DCTUYU : Heat exchanger temperature of dew condensation sweating prevention
3˚C
1˚C
(Return area)
(Up-area)
(Steady area)
(Step down area)
2˚C
DCTUYU
at the descend of
heat exchanger temp.
at the rise of heat
exchanger temp.
(R1923)
Setting a constant
J type pair
J type multi.
DCTUYU
Room temp. × 0.94 - 12.5
11°C
