Electra WNG 25 DCI INV Service Manual page 32

11.7.5 Heat Sink Over Heating Protection (NA for DCI 25 and 35)
HST HST Trend
Decreasing
HST > 90 SC
85 < HST ≤ 90 D1
82 < HST ≤ 85 SR
80 < HST ≤ 82 SR
78 < HST ≤ 80 Norm
HST ≤ 78 Normal
11.7.6 Outdoor Coil Deicing Protection
11.7.6.1 Deicing Starting Conditions
Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – 8 AND TLD
Case 2: OCT < OAT – 12 AND TLD
Case 3: OCT is Invalid AND TLD
Case 4: Unit is ust switched to STBY AND OCT j
Case 5: NLOAD = 0 AND OCT
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 – WNG DCI
No Change
SC
D2
D1
SR
Norm
> DI
> 30 minutes.
> DI
< OAT - 8
< OAT -8
CONTENT
Increasing
SC
D2
D2
D1
SR
Revision 0
CONTROL SYSTEM
11-7