11-4
CONTROL SYSTEM
SM DUODCI 1-A.1 GB
11.7 EEV (electronic Expansion valve) Control
EEV opening is defined as EEV = EEV
OL
+ EEV
CV
• EEV
OL
is the initial EEV opening as a function of the compressor frequency, operation
mode, unit model and capacity.
• EEV
CV
is a correction value for the EEV opening that is based on the compressor
temperature.
• During the first 10 minutes of compressor operation EEV
CV
= 0.
• Once the first 10 minutes are over, the correction value is calculated as follow: EEV
CV
(n) =
EEV
CV
(n-1) + EEV
CTT
• EEV
CTT
is the correction based on the compressor temperature. A target compressor
temperature is set depending on frequency and outdoor air temperature, and the actual
compressor temperature is compared to the target temperature to set the required
correction to the EEV opening.
11.8 Reversing Valve (RV) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.
11.9 Ionizer Control
Ionizer is on when unit is on AND indoor fan is on AND Ionizer power switch (on Ionizer) is
on.
11.10 Electro Static Filter (ESF) Control
ESF is on when ESF switch is on, Safety switch is pressed, unit is on, AND indoor fan is on.
11.11 Base Heater Control
When OAT is connected, Base Heater will be on when unit is in heating and OAT<2
0
C.
When OAT is disconnected, Base Heater will be on when unit is in heating.
11.12 Fan Mode
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
In Auto Fan user setting, fan speed will be adjusted automatically according to the
difference between actual room temperature and user set point temperature.
11.13 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 Auto Fan user setting, fan speed will be adjusted automatically according to the
calculated NLOAD.
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