Service manual

13-10
CONTROL SYSTEM
SM DLF 1-A.1 GB
13.1.17.2 Compressor Over Current Protection Only For DCI25/35/50/60/72Z
Normal
Stop-Rise
HzDown1
HzDown2
Stop-Compresor
CCROC1
CCROC2
CCROC3
CCROC4
CCR
13.1.18 Heat Sink Overheating Protection
13.1.08.1 Heat Sink Overheating Protection For DCI25/35/50/60/72Z
HST
HST Trend
Fast Decreasing Decreasing No Change Increasing Fast Increasing
≥ 90 SC SC SC SC SC
[85, 90) D1 D1 D2 D2 D2
[82, 85) SR SR D1 D2 D2
[80, 82) SR SR SR D1 D1
[78 , 80) Norm Norm Norm SR SR
< 78 Norm
13.1.19 Outdoor Coil Deicing Protection
13.1.19.1 Outdoor coil Deicing Protection For DCI25/35/50/60/72Z
• 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.
CONTENT