Dew Condensation Sweating Prevention Function - Daikin FTK25JVE9 Service Manual

General Functionality
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.
Dew condensation sweating prevention function will start, if
simultaneous condition with AND.
Dew condensation sweating prevention function will be completed if
coordinate condition with OR.
2. Control details
DCTUYU+3˚C
DCTUYU+2˚C
DCTUYU+1˚C
"
"
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"
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DCTUYU : Heat exchanger temperature of dew condensation sweating prevention
40
Operation mode is in Cooling/Dry.
Compressors operate.
Fan speed < MH tap
Outdoor temperature ≤ 32°C
Operation mode is not in Cooling/Dry.
Compressors stop
MH tap ≤ fan speed
Outdoor temperature > 32°C
DCTUYU
at the descend of
heat exchanger temp.
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.
Setting a constant
DCTUYU
(Return area)
(Up-area)
(Steady area)
(Step down area)
at the rise of heat
exchanger temp.
J type pair
Room temp. × 0.94 - 12.5
Si04-115
are under the
are under the
(R1923)
J type multi.
11°C
Main Function