12-4
CONTROL SYSTEM
SM XLFDCI 1-A.1 GB
When compressor is switched to OFF and the heat sink temperature is above 55 degrees, the
outdoor fan will remain ON in low speed for up to 3 minutes.
EEV (Electronic Expansion Vavle) Control
EEV Control for GC 9 / 12
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 5 minutes of compressor operation EEV
CV
= 0.
Once the first 5 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.
RV(Reversing Valve) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes.
Ionizer Control
Ionizer is on when unit is on ,AND indoor fan is on ,AND Ioniser power switch is on.
Base Heater Control
The base heater will be working only when RV is “ON” according to the following graph:
When OAT is faulty the base heater will be “ON” continuously in HEAT mode.
Fan Mode
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 difference between
actual room temperature and user set point temperature.
Cool 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.
ON
OFF
OAT
0
2
Base
Heater
CONTENTS
