12-20
CONTROL SYSTEM
SM ALPHA 1-E.3 GB
Deicing procedure
OCT [
o
c]
ON
OFF
ON
OFF
ON
L
ANY
COMP
OFAN
RV
IFAN
DST
(DDT)
0
12
OFF
HEs are forced ON
DOC
ANY
ON
HE
36s 36s
DT
30s
max 12 min.
Note 3
DI (note 1)
DI (note 2)
30s
3 min 3 min
IFAN
OFF
ANY
HE
OFF
ANY
all SH units
except WAX
RC or WAX units
HEs are forced OFF
IFAN is forced to Low Speed
BLINK
ON
OPER
LED
Notes :
• At the fi rst COMP activation after SB or OFF, if (OCT < 0
o
c), then DI = 10
min, else DI = 40 min.
• In the following Deicing cycles, the time interval between two Deicing
cycles activation is between 30 to 80 min (refer to the fl ow chart).
• For RC group, HEs are forced OFF. IFAN operation is as in Heat
Mode, Sect 4.0.3.a, i.e. IFAN will be set to OFF when ICT<30
o
c.
For WAX, the IFAN is simply forced OFF.
• For SH group, HEs are forced ON and IFAN is forced to operate in Low
speed, regardless of the ICT and difference between RAT & SPT.
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