12-5
CONTROL SYSTEM
SM XLFDCI 1-A.1 GB
Heat Mode
NLOAD is calculated according to the difference between actual room temperature and user set
point temperature by
fuzzy
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.
Temperature Compensation
In wall mounted, ducted, and cassette models, 3 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.
The temperature compensation can be enabled/disabled by shortening of J2 on the indoor unit
Controller
Model
J2 Shorted(ON)
J2 Opened(OFF)
Wall mounted
Compensation Disabled
Compensation Enabled
Cassette
Compensation Enabled
Compensation Disabled
Ducted
Compensation Enabled
Compensation Disabled
Floor/Ceiling
Compensation Disabled
Compensation Enabled
Indoor Fan Control in Heating Mode
Indoor fan speed depends on the indoor coil temperature:
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 (.T).
Unit will switch from cool to heat when compressor is off for 3 minutes, and .T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and .T < -3.
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