11-4
CONTROL SYSTEM
SM TRIO52 1-A.2 GB
11.7
EEV (electronic Expansion valve) Control
EEVi opening of the ‘i’ indoor unit is defined as EEVi = EEV
OL
i + EEV
CV
i
x
EEV
OL
i is the initial EEV opening as a function of the compressor frequency, operation
mode, unit model and capacity.
x
EEV
CV
i is a correction value for the EEV opening that is based on the compressor
temperature.
x
During
the
first
5
minutes of compressor operation EEV
CV
i = 0.
x
Once
the
first
5
minutes are over, the correction value is calculated as follow: EEV
CV
i(n)=
EEV
CV
i(n-1) + EEV
SH
i + EEV
CTT
i
EEV
SH
i = EEV
minSH
i+ EEV
deltaSH
i
x
EEV
minSH
i is correction for the EEV opening of the ‘i’ indoor unit as of the whole system
superheat.
x
EEV
deltaSH
i is correction for the EEV opening of the ‘i’ indoor unit as of balance between each
unit.
x
EEV
CTT
i is the correction for the EEV opening of the ‘i’ indoor unit 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
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
.
11.10 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.
11.11 Indoor Units Operation when Indoor Unit Mode is Different than
Outdoor Unit Mode
z
Open louvers according to user selection.
z
Indoor fan is forced to OFF.
z
Led blinks every 2 second
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
NLOADi 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 NLOADi.
CONTENTS
