11-4
CONTROL SYSTEM
SM PNXDCI 1-A.1 GB
11.3 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 ad8usted automatically according to the calculated NLOAD.
11.4 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 adng to the calculated NLOAD.
11.4.1 Temperature Compensation
In wall mounted 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 J2 Opened
Wall Mounted (PNX) Compensation Disable Compensational Enabled
11.4.2 Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature:
11.5 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 (ΔT).
Unit will switch from cool to heat when compressor is off for 3 minutes, and ΔT < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and ΔT < -3.
11.6 Dry Mode
As long as room temperature is higher then the set point, indoor fan will work in low speed and compressor will work
between 0 and MaxNLOADIF1C Hz.
When the room temperature is lower than the set point, compressor will be switched OFF and indoor fan will cycle 3
minutes OFF, 1 minute ON.
11.7 Protections
There are 5 protection codes.
Normal (Norm) – unit operate normally.
Stop Rise (SR) – compressor frequency can not be raised but does not have to be decreased.
HzDown1 (D1) – Compressor frequency is reduced by 2 to 5 Hz per minute.
HzDown2 (D2) – Compressor frequency is reduced by 5 to 10 Hz per minute.
Stop Compressor (SC) – Compressor is stopped.
ICTST ICTVL ICTL ICTH ICTT
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