CONTROL SYSTEM
SM PNXADCI 1-A.1 GB
12-5
+
Target_CTT_Gamma_H
*Actual Compressor Frequency
+
Target_CTT_Delta_H
12.1.8
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.
12.2
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.
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
ICTVL
ICTT
ICTH
ICTL
ICTST
