Condenser Fans; Duty Setting (Par. C4); Running Time Defrost (Par. D10, D11) - Carel ir33+ small wide User Manual

The fan can be switched off in the following situations:
•
when the compressor is off (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 off . 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
dd Dripping time after defrost (fans off )
F2 Evaporator fans with compressor off
0 = See F0
1 = Always off
F3 Evaporator fans during defrost
0/1=on/off
Fd Post-dripping time (fans off )

6.11 Condenser fans

The condenser fans are activated based on parameters F4 and F5.
After the compressor is fi rst started, the condenser fans are activated at
F4+0.2 degrees to off set any rapid temperature increases that the probe
cannot keep up with. Subsequently, the fans are switched on and off at
F4+F5 and F4.
Par. Description
F4 Condenser fan deactivation temperature
F5 Condenser fan activation diff erential
F4 + F5
F4 + 0.2
F4
First
switch-on
ON
FAN
OFF
Key
Sc Condenser probe
FAN Condenser fans
F4 Deactivation temperature
Note: if no condenser probe is selected, the condenser fan output is
deactivated.
Def Min Max UOM
2 0 15
1 0 1
1 0 1
1 0 15
Tab. 6.n
Def Min Max UOM
40 -50 200 °C/°F
5.0 0.1 20
Tab. 6.o
Sc
Fig. 6.t
Sv Virtual probe
t Time
F5 Diff erential

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 fi xed OFF
time of 15 minutes.
Par. Description
c4 Compressor running time with duty setting 0
min
-
ON
CMP
-
OFF
min

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
°C/°F
be frozen and a defrost is activated. The time is reset if the temperature
returns above the threshold.
Par. Description
d10 Defrost time in "Running time" mode
0 = function disabled
d11 Running time defrost temperature threshold 1
dt1
t
Sd
d11
t
ON
DEF
OFF
Key
Sd Defrost probe
DEF Defrost
35
Def Min Max UOM
0
c4
15
Fig. 6.u
Def Min Max UOM
0 0
-20
d10
Fig. 6.v
t time
ir33plus +0300028EN rel. 1.1 - 05.05.2017
ENG
100 min
t
250 hour
20 °C/°F
Tab. 6.p
t
t