Protection Operations In Heat Mode - Argo Ulisse 10 AUR101CL Technical Data & Service Manual

7 Protection Operations in Heat Mode

7-1 Outdoor Coil Deice Protection
The deice process is controlled by an Ice Detection Algorithm (IDA). The IDA is an unique control
algorithm incorporated to maintain optimal utilization of the heat pump capacity, especially in below-zero
outdoor temperature condition. The out-coil deicing will be activated not only by static temperature
detection as normally done, but also while ice forming is detected on the out-coil.
TLD > DI
No OCT < DST
(during last 3 minutes)
Yes
Deicer activation
(see Notes)
LDT > DT + TimeD
Yes
DI = TLD - DIT
DDT and DTF information from Deicing
Dynamic Threshold setting routine
&
No
LDT < DT-TimeD
No or
LDT < DTmin
Yes
DI = TLD + DIT
No DI < DImin
Yes
DI = DImin
DI > DImax
No
Yes
DI = DImax
DT = LDT
COMP to ON
DI = 40 (or 10)
DT = 5
Activate DDt setting
Routine
Start counting TLD
DTF = 0
OCT < DOC ?
No
Yes
DTF=1
&
OCT < DDT
(during last 3 minutes)
&
ICT < 40 deg
Yes
Deicer activation
(see Notes)
No
DI = TLD
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