Service manual

13-4
CONTROL SYSTEM
SM DLF 1-A.1 GB
13.1.6 Minimum On and Off Time
3 minutes
13.1.7 Indoor Fan Control
8 Indoor fan speeds are determined for each model. 4 speeds for cool/dry/fan modes and 4speeds
for heat mode.
When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will operate constantly
at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is set
according to the cool/heat load.
13.1.7.1 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 then 3 degrees.
Room temperature > 22 for cooling, or < 25 for heating.
13.1.8 Outdoor Fan Control
13.1.8.1 Outdoor Fan Control for DCI25/35/50/60
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 operation mode,
compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).
Routine Conditions
A
Heating with OAT < 15ഒ or
Cooling with OAT > 20ഒ, or Faulty OAT
B Cooling with 20ഒ > OAT > 7ഒ
C Cooling with 7ഒ > OAT
D Heating with OAT > 15ഒ
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
CONTENT