Electra LEX 25 DCI Service Manual page 75

Deicing Operation Procedure
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O C T
1 2
0
T h re s h o ld
O N T 1
C O M P
D e ic e F re q C h R V
H E A T
R V
C O O L
O N
O F A N
O F F
E E V D e ic e rO p e n
E E V
A n y
T1=60 secondes;T2=36 secondes;T3=6 secondes
12.7.7.2 Outdoor coil Deicing Protection For DCI 72 / 80
Entering Deicing Conditions
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Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – 8 AND TLD > DI
Case 2: OCT < OAT – 12 AND TLD > 30 minutes.
Case 3: OCT is Invalid AND TLD > DI
Case 4: Unit is just switched to STBY AND OCT < OAT – 8
Case 5: NLOAD = 0 AND OCT < OAT - 8
Case 6: OAT is invalid AND OCT< 8 AND TLD > DI AND Compressor ON Time > 15 minutes
All this condition will exist during 400 seconds
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval between Two Deicing)
Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and
is 40 minutes in other cases.
Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of deicing
time. If deicing time is shorter then former deicing time, the deicing interval time will be increased. If
deicing time is longer then former deicing time, the deicing interval time will be decreased.
SM LEXDCI 1-E.1 GB
T 2
D T
m a x. 1 2 m in u te s
T 3 T 3
CONTENTS
CONTROL SYSTEM
T 1
12-11