Electra LEX 25 DCI Service Manual page 74

CONTROL SYSTEM
12.7.5.2 Heat Sink Overheating Protection For DCI 72 / 80
HST
HST≥ 81
79 ≤ HST < 81
75 ≤ HST < 79
73≤ HST< 75
71 ≤ HST ≤ 73
HST < 71
12.7.6 System Over Power Protection Only For DCI 72 / 80
Power
PWR1
PWR ≥ 3500
3300≤PWR < 3500 2750≤PWR < 2900
3100 ≤PWR < 3300 2600≤PWR < 2750
3000≤PWR < 3100 2450≤PWR < 2600
2950 ≤PWR ≤ 3000
PWR < 2950
There are two sets of OVRPWR values, the selection of the values are set according to the state of
the Power-Shed input.
Power-Shed input open Set values 1
Power-Shed input sort Set values 2
12.7.7 Outdoor Coil Deicing Protection
12.7.7.1 Outdoor coil Deicing Protection For DCI 50 / 60 / 72 Z
Entering Deicing Conditions
►
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: OCT<-19 AND TLD>60 minutes
All this condition will exist during 10 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.
12-10
<-2 -2
SC SC
D1 D1
SR SR
SR SR
Norm Norm
< -2000
PWR2
PWR ≥ 2900 SC
D1
SR
SR
2300 ≤PWR ≤
Norm
2450
PWR < 2300
CONTENTS
Delta HST
-1,0,1 2
SC SC
D2 D2
D1 D2
SR D1
Norm SR
Norm
Delta PWR
[-2000,0) 0 (0,2000]
SC SC
D1 D2
SR D1
SR SR
Norm Norm
Norm
SM LEXDCI 1-E.1 GB
>2
SC
D2
D2
D1
SR
> 2000
SC SC
D2 D2
D2 D2
D1 D1
SR SR