12-8
CONTROL SYSTEM
SM GCD030 1-A.0 GB
12.4.2
Indoor Fan Control in Heating Mode
Indoor fan speed depends on the indoor coil temperature:
12.5
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 (.T). Unit will
switch from cool to heat when compressor is off for 3 minutes, and .T < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and .T < -3.
12.6 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.
12.7 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.
12.7.1
Indoor Coil Defrost Protection
12.7.1
Indoor Coil Defrost Protection
ICT
ICT Trend
Fast
Increasing
Increasing
No Change
Decreasing
Fast
Decreasing
ICT<
-2
SC
SC
SC
SC
SC
-2
≤
ICT<
0
D1
D1
D2
D2
D2
0
≤
ICT <
2
SR
SR
D1
D2
D2
2
≤
ICT<
4
SR
SR
SR
D1
D2
4
≤
ICT <
6
Norm
Norm
SR
SR
D1
6
≤
ICT
≤
8
Norm
Norm
Norm
SR
SR
ICT>
8
Norm
CONTENTS