12-42
CONTROL SYSTEM
Revision Y06-01
Service Manual - LEX
12B.2.14 Deicing
Deicing starts, if OCT <= -6ºC and meets with one of the following conditions:
x
ICT < 39ºC, and IFAN is on for 20 minutes, and COMP is on for 5
minutes, and that ICT decrease 1ºC per 6 minutes, occur 3 times;
x
ICT < 39ºC, and (sum of COMP on >= 3 Hours), and COMP is on for 20
minutes;
x
ICT – RT < 19ºC ( for F/S :ICT-RT<16ºC )keep for 5 minutes, and (sum
of COMP on) > 45 minutes ,And COMP is on for 20 minutes;
x
(4) ICT =< 35 ºC, and IFAN is on for 20 minutes, COMP is on for
5minutes,and sum of COMP on > 45 minutes.
Note:
x
If OCT is invalid, and (ICT < 39ºC), and COMP keeps on for 30
minutes, and ICT is decreasing 1ºC per 6 minutes occur 3 times;
x
If OCT and ICT are invalid; and if (sum of COMP on) >= 3 Hours;
x
If ICT is invalid, and (OCT <-6ºC) keeps for 4 min, (sum of COMP on) > 45min.
13b.2.14.1
Deicing process
:
According to anti-cool wind
IFAN Any
Off
OFAN Any
Off
RV Any
Off
COMP Any
Off
AHEAT Any
Off
1min 55s 5s 9 min or OCT >= 12 ºC 55s 20s 5s
x
At the beginning of Deicing, COMP, IFAN, OFAN stop, RV stops after 55
seconds, and then COMP will turn on after 5 seconds.
x
Deicing ends if (OCT >= 12ºC) or Deicing time is more than 9 minutes.
x
Once deicing ends, IFAN operates according to anti-cool fan mode;
x
Once deicing ends, COMP stops for 20 seconds, OFAN will turn on.
After 35 seconds, RV will turn on, 5 seconds later COMP resumes its
operation;
x
If AHEAT is operating when deicing conditions met, AHEAT will be
turned off, and o deicing starts 1 minute later.
x
After Deicing ends, if the conditions of AHEAT opening are met, AHEAT will turn on.
Note:
1. Deicing can’t end at the first 60 seconds once it was activated.
2. If OCT is invalid, Deicing ends after 5 minutes.
