Airwell Multi Split DUO 50 DCI, Service Manual

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13-8
CONTROL SYSTEM
SM DLF 1-A.1 GB
13.1.13.2 Indoor Fan Control in Heating Mode
Indoor fan speed depends on the indoor coil temperature:
13.1.14 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.
13.1.15 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.
13.1.16 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.
13.1.16.1 Indoor Coil Defrost Protection — CK
Min(ICT,ICTE)
Trend
Fast Increasing Increasing No Change Decreasing Fast Decreasing
< -2 SC SC SC SC SC
[-2, 0) D1 D1 D2 D2 D2
[0, 2) SR SR D1 D2 D2
[2, 4) SR SR SR D1 D2
[4, 6) Norm Norm SR SR D1
[6, 8] Norm Norm Norm SR SR
> 8 Norm