Electra LEX 25 DCI Service Manual page 54

11.4.2 Indoor Fan Control in Heat Mode
Indoor fan speed depends on the indoor coil temperature:
ICTST
11.5 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 )ΔT(.
Unit will switch from cool to heat when compressor is off for 3 minutes, and ΔT < -3.
Unit will switch from heat to cool when compressor is off for 5 minutes, and ΔT < -3.
11.6 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
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.
11.7 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.
11.7.1 Indoor Coil Defrost Protection
ICT ICT Trend
Fast
Increasing
ICT < -2 SC
-2 ≤ ICT < 0 D1
0 ≤ ICT < 2 SR
2 ≤ ICT < 4 SR
4 ≤ ICT < 6 Norm
6 ≤ ICT < 8 Norm
8 ≤ ICT Normal
SM LEXDCI 1-E.1 GB
ICTVL ICTL ICTH
MaxNLOADIF1C
Increasing
SC
D1
SR
SR
Norm
Norm
CONTENTS
ICTT
Hz.
No change Decreasing
SC SC
D2 D2
D1 D2
SR D1
SR SR
Norm SR
CONTROL SYSTEM
Fast
Decreasing
SC
D2
D2
D2
D1
SR
11-5