General Functions
SiBE04-101
42
Main Function
1.21
Dew 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.
Operation mode is in Cooling/Dry.
Compressors operate.
Fan speed < H tap
Outdoor temperature
≤
32˚C
The function to prevent dew condensation will start, if
are under the simultaneous condition with
AND.
Operation mode is not in Cooling/Dry.
Compressors stop
H tap
≤
fan speed
Outdoor temperature > 32˚C
The function to prevent dew condensation will be completed, if
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.
(R1045)
Outdoor Unit
RXDMX
DCTUYU
Room temp.
×
0.94 - 12.0˚C
13˚C
SiBE04-101.book Page 42 Monday, October 15, 2001 3:08 PM