Service manual

11-10
CONTROL SYSTEM
SM HADDCI 1-A.2 GB
2. For S/W 370V and higher (For 467300225R Controller)
Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < DST AND TLD > DI•
Case 2: OCT < OATmax – 12 AND TLD > DI.•
Case 3: OCT is Invalid AND TLD > DI•
Case 4: Unit is just switched to STBY AND OCT < DST•
Case 5: NLOAD = 0 AND OCT < DST•
Case 6: OCT<-1 AND TLD>100min •
DST Definition:
When OATmax>0, then DST=8
When OATmax<=0, then DST= -0.8 X OATmax+8
OATmax=Rolling/Moving
Max. of OAT during the 10 mins before the last 20 mins
11.7.6.2 Deicing Protection Procedure
T1 = DEICT1, T2 = DEICT2, T3 = DEICT3
11.7.7 Condensate Water Over Flow Protection
Each of the pins P1, P2, P3 can have two options:
1 – When it is shorted with P4
0 – When it is not shorted to P4
COMP
RV
OFAN
EEV
ON
HEAT
COOL
ON
OFF
EEVDeicerOpen
Any
T1 T2
T3 T3
T1
12
0
Threshold
max. 12 minutes
DT
OCT
CONTENTS