11-6
CONTROL SYSTEM
SM DUODCI 1-A.1 GB
11.16 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.
11.17 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.
11.17.1 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
8 ≤ ICT Normal
11.17.2 Indoor Coil over Heating Protection
ICT
ICT Trend
Fast
Decreasing
Decreasing No Change Increasing
Fast
Increasing
ICT > 55 SC SC SC SC SC
53 < ICT ≤ 55 D1 D1 D2 D2 D2
49 < ICT ≤ 53 SR SR D1 D2 D2
47 < ICT ≤ 49 SR SR SR D1 D2
45 < ICT ≤ 47 Norm Norm SR SR D1
43 < ICT ≤ 45 Norm Norm Norm SR SR
ICT ≤ 43 Normal
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