12-8
CONTROL SYSTEM
SM XLFDCI 1-A.1 GB
Heat Sink Overheating Protection
Heat Sink Overheating Protection For GC 9 / 12
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
Outdoor Coil Deicing Protection
Outdoor coil Deicing Protection For GC 9 / 12
●
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.
CONTENTS
