12-6
CONTROL SYSTEM
SM YBD018 1-A.1 GB
12.3
Cool Mode
NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.
12.4
Heat Mode
NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by PI control.
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In AutoFan user setting, fan speed will be adjusted automatically according to the calculated
NLOAD.
12.4.1 Temperature
Compensation
4 degrees are reduced from room temperature reading (except when in I-Feel mode), to compensate
for temperature difference between high and low areas in the heated room, and for coil heat
radiation on room thermistor.
12.4.2
Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature:
12.5
Auto Cool/Heat Mode
When in auto cool heat mode unit will automatically select between cool and heat mode according to
the difference between actual room temperature and user set point temperature (
ǻ
T).
Unit will switch from cool to heat when compressor is off for 3 minutes, and
ǻ
T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and
ǻ
T < -3.
12.6
Dry Mode
As long as room temperature is higher then the set point, indoor fan will work in low speed and
compressor will work between 0 and
MaxNLOADIF1C
Hz.
When the room temperature is lower than the set point, compressor will be switched OFF and indoor
fan will cycle 3 minutes OFF, 1 minute ON.
ICTVL ICTT
ICTH
ICTL
ICTST
