35
ENG
ir33plus +0300028EN rel. 1.1 - 05.05.2017
The fan can be switched o in the following situations:
• when the compressor is o (parameter F2);
• during the defrost (parameter F3).
During the dripping period (parameter dd > 0) and the post-dripping
period (parameter Fd > 0) the evaporator fans are always o . This is
useful to allow the evaporator to return to temperature after defrosting,
thus avoiding blowing warm hot and moist air into the refrigerator. The
evaporator fans can be forced on during normal control (parameter F2)
and during defrost (parameter F3).
Par. Description Def Min Max UOM
dd Dripping time after defrost (fans o ) 2 0 15 min
F2 Evaporator fans with compressor o
0 = See F0
1 = Always o
101-
F3 Evaporator fans during defrost
0/1=on/o
101-
Fd Post-dripping time (fans o ) 1 0 15 min
Tab. 6.n
6.11 Condenser fans
The condenser fans are activated based on parameters F4 and F5.
After the compressor is rst started, the condenser fans are activated at
F4+0.2 degrees to o set any rapid temperature increases that the probe
cannot keep up with. Subsequently, the fans are switched on and o at
F4+F5 and F4.
Par. Description Def Min Max UOM
F4 Condenser fan deactivation temperature 40 -50 200 °C/°F
F5 Condenser fan activation di erential 5.0 0.1 20 °C/°F
Tab. 6.o
ON
OFF
FAN
F4 + F5
Sc
F4
F4 + 0.2
First
switch-on
t
t
Fig. 6.t
Key
Sc Condenser probe Sv Virtual probe
FAN Condenser fans t Time
F4 Deactivation temperature F5 Di erential
Note: if no condenser probe is selected, the condenser fan output is
deactivated.
6.12 Duty setting (par. c4)
If alarm “rE” (virtual control probe fault) is activated, this parameter is
used to ensure operation of the compressor until the fault is resolved.
As the compressor is no longer able to operate based according to the
temperature (due to the probe fault), it is made to run cyclically with a
running time equal to the value assigned to parameter c4 and a xed OFF
time of 15 minutes.
Par. Description Def Min Max UOM
c4 Compressor running time with duty setting 0 0 100 min
ON
OFF
CMP
c4
15
t
Fig. 6.u
6.13 Running time defrost (par. d10, d11)
Running time is a special function that determines when the refrigeration
unit needs defrosting. In particular, it is assumed that if the evaporator
temperature measured by probe Sd remains continuously below a
certain set threshold (d11) for a certain time (d10), the evaporator may
be frozen and a defrost is activated. The time is reset if the temperature
returns above the threshold.
Par. Description Def Min Max UOM
d10 Defrost time in “Running time” mode
0 = function disabled
0 0 250 hour
d11 Running time defrost temperature threshold 1 -20 20 °C/°F
Tab. 6.p
ON
OFF
DEF
d11
Sd
dt1
d10
t
t
Fig. 6.v
Key
Sd Defrost probe t time
DEF Defrost
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