11-6
CONTROL SYSTEM
SM DUO38I 1-A.2 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
