12-7
CONTROL SYSTEM
SM WNGDCI 2-E.4 GB
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
ICT
ICT Trend
Fast
Increasing
Increasing
No Change
Decreasing
Fast
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
12.7.2 Indoor
Coil
Overheating
Protection
12.7.2.1 Indoor Coil Overheating Protection For WNG 50 / 60 / 72
ICT
ICT Trend
Fast
Decreasing
Decreasing
No Change
Increasing
Fast
Increasing
ICT
>
62
SC
SC
SC
SC
SC
60
≤ ICT
<
62
D1
D1
D2
D2
D2
55≤ ICT
<
60
SR
SR
D1
D2
D2
52
≤ ICT
<
55
SR
SR
SR
D1
D2
48
≤ ICT
<
52
Norm
Norm
SR
SR
D1
45
≤ ICT
≤
48
Norm
Norm
Norm
SR
SR
ICT
<
45
Norm
CONTENTS
