12-3
CONTROL SYSTEM
SM YBD018 1-A.1 GB
12.1.1.1 Frequency Changes Control
Frequency change rate is 1 Hz/sec.
12.1.1.1 Compressor Starting Control
Frequency
Time
Min 10 Minutes
1
Minute
Step 1
Step 3
1
Minute
Step 2
12.1.1.1 Minimum On and Off Time
3 minutes.
12.1.4
Indoor Fan Control
10 Indoor fan speeds are determined for each model. 5 speeds for cool/dry/fan modes and 5 speeds
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.
12.1.1.1 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:
x
Difference between set point and actual room temperature is bigger then 3 degrees.
x
Room temperature > 22 for cooling, or < 25 for heating.
12.1.5
Heating Element Control
Heating element can be started if LOAD > 0.8 * MaximumNLOAD AND Indoor Coil temperature <
45.
The heating element will be stopped when LOAD < 0.5 * MaximumNLOAD OR if Indoor Coil
temperature > 50.
12.1.6
