Electra DCR 25 Service Manual page 34

11.7.4 Compressor over Current Protection
CCR
CCROC4
CCROC3
CCROC2
CCROC1
11.7.5 Heat Sink Over Heating Protection (NA for DCI 25 and 35)
HST
HST > 90
85 < HST ≤ 90
82 < HST ≤ 85
80 < HST ≤ 82
78 < HST ≤ 80
HST ≤ 78
11.7.6 Outdoor Coil Deicing Protection
Deicing Starting 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
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.
Service Manual - Delta DCI
Stop-Compresor
HzDown1
Normal
Decreasing
SC
D1
SR
SR
Norm
Revision Y05-01
CONTENT
CONTROL SYSTEM
HzDown2
HST Trend
No Change
SC
D2
D1
SR
Norm
Normal
Stop-Rise
Increasing
SC
D2
D2
D1
SR
11-7