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12. DE-ICING
the
Aqu@ Scop Advance DCI
automatically detects a need for de-icing in two different ways.
12.1. DE-ICING MANAGEMENt BY tIME
the principle of de-icing management by time is simple. When the coil temperature (sensor located at the bottom
of the outdoor exchanger) drops below a certain limit, a timer starts counting down. When this counted down time
reaches a set value (default setting 50 minutes) the controller considers that there is a need for de-icing.
12.1.1. tEMPERAtURE FoR tHE StARt oF tHE tIME CoUNtDoWN
the two parameters used for deice temperature are:
oCt
is the instantaneous temperature read by the sensor located at the bottom of the outdoor exchanger (known
as the evaporator).
D02
is the coil temperature limit for starting the countdown. When oct drops below this value, the time countdown
starts. the maximum value of this parameter is -2°c, but it changes automatically in relation to the outdoor
temperature in the following manner:
VALUE
D05
VALUE
D04
VALUE
D03
VALUE
D02
VALUE
D01
+
Exits without changing the value
Stores the new value
Decreases the value
Increases the value
+
+
dFr
+
0
+
PSS
+
LWT / OFF
-12
-10
-8
-6
-4
-2
0
Outdoor temperature (°C)
Coil Temperature limit
(°C)
Coil Temp. limit / Outdoor Temp.
-10
-8
-6
-4
-2
-0
4
2
6
-14
-12
12.1.2. tIME CoUNtED DoWN BEFoRE DE-ICING
When the coil temperature (oct) has remained below the
D02 value
for a time
D04
(50 minutes), de-icing starts.
the deice time d04 can be modified by the user.
We do not recommend that the time before de-icing is changed without knowledge of the actual
operating conditions of the
Aqu@ Scop Advance DCI
, and of heat pump systems in general.
increasing this time may lead to major de-icing malfunctions. reducing it will lead to degraded
product performance.
the lapsed (or counted down) time only resets itself to zero in the case of de-icing, if the power to the
Aqu@ Scop Advance DCI
is switched off, or under very special conditions with the appliance stopped (outdoor
temperature > 7°c, coil temperature > 5°c and the compressor stopped for at least 30 minutes). if the compressor
stops this time is frozen and the countdown resumes when the compressor restarts. if an alarm stops the de-icing,
the time is not reset to zero and the
Aqu@ Scop Advance DCI
will attempt to proceed with a new de-icing
sequence after the alarm has been reset.
refer to the §
EXAMPLE oF DE-ICING
, page 30
