12-3
CONTROL SYSTEM
SM XLFDCI 1-A.1 GB
Turbo Speed
The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
Difference between set point and actual room temperature is bigger than 3 degrees.
Room temperature > 22 for cooling, or < 25 for heating.
Outdoor Fan Control
Outdoor Fan Control for DCI25/35
7 outdoor fan speeds are determined for each model. 3 speeds for cool and dry modes, and 3speeds
for heat mode, and a very low speed.
Outdoor fan speed is a function of compressor frequency and outdoor air temperature (OAT).
4 routines for fan control are determined. The control routine selection depends on operationmode,
compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).
Routine Conditions
A
Heating with OAT < 15
℃
or
Cooling with OAT > 20
℃
, or Faulty OAT
B
Cooling with 20
℃
> OAT > 7
℃
C
Cooling with 7
℃
> OAT
D
Heating with OAT > 15
℃
OFAN Speed
Compressor
Target Frequency
Routin
A
Routin
B
Routin
C
Routin
D
Freq=0
OFF
OFF
OFF
OFF
10
≤
Freq <
OFLowFreq
Low
Low
VL
Low
OFLowFreq
≤
Freq<
OFMedFreq
Medium
Low
VL
Low
OFMedFreq
≤
Freq
High
Low
Low
Medium
Change To Higher
OFAN Cool state (*1)
45
50
HST
Change To lower
OFAN Cool state
(*1)
If State C, change to B
If State B, change to A
20
A
B
C
3 Degrees
3 Degrees
7
OFAN State
at Cool Mode
OAT
Note: Periorities A >B >C
CONTENTS
