50
ON
OFF
Amb.
Amb. F1
Amb. F1 - A0
Evap.
Evap. Fan
temperatura
Fig. 7.o
ENGLISH
ir33 +030220441 - rel. 2.0 - 01.05.2006
7.6 Fan management parameters
Code Parameter MSYF ** UOM Type Min Max Def.
F0 Fan management ---F fl ag C 0 2 0
F1 Fan start temperature ---F °C/°F F -50 200 5.0
F2 Fan OFF with compressor OFF ---F fl ag C 0 1 1
F3 Fans in defrost ---F fl ag C 0 1 1
Fd Fan OFF after dripping ---F min F 0 15 1
F4 Condenser fan stop temperature MSYF °C/°F C -50 200 40
F5 Condenser fan start differential MSYF °C/°F C 0.1 20 5.0
Tab. 7.l
The ir33 series controllers manage the evaporator fans in the following modes:
• always ON;
• ON only when the compressor is ON;
• ON according to evaporator and room temperature.
F0: Fan management
The fans can be managed by the “fan controller”, which controls them according to the temperature
measured by the defrost and virtual control probes. Otherwise, the fans can be left always ON.
They can be stopped in the following situations:
• when the compressor is OFF (see parameter F2);
• during defrosts (see parameter F3);
• during the dripping period (see parameter dd);
• and for a further post-dripping period (see parameter Fd).
They can be forced ON during defrosts (see parameter F3).
The following values are allowed for this parameter:
F0=0 fans always ON;
F0=1 fans controlled according to the temperature difference between the virtual control probe and the
evaporator temperature;
F0=2 fans controlled according to the evaporator temperature.
Warning: remember that if a dripping period is set (dd=0), the fans are stopped irrespective of the value
of F0.
Default: F0=0 => fans always ON, not managed by the “fan controller”.
F1: Fan start temperature (parameter valid only if F0 =1 or 2)
When F0=1, parameter F1 indicates the minimum difference between room temperature and evaporator
temperature for the fans to be started. Therefore, when:
• evaporator temperature < (virtual probe – F1-A0), the fans are ON;
• evaporator temperature > (virtual probe – F1), the fans are OFF.
When stopped, the fans can start again when the difference between the two probes is equal to F1+A0,
where A0 is the “fan controller” differential (see Figure 7.o).
When F0=2, parameter F1 indicates the absolute temperature for starting the fans, that is:
• evaporator temperature < (F1-A0), the fans are ON;
• evaporator temperature > (F1), the fans are OFF.
Notes:
• if there are two evaporators and therefore two evaporator probes, control will be performed using the
maximum value read by the two probes, to ensure that the fans are started when both evaporators
reach the set temperature.
• in the event of errors on the control probes, the fans are always on.
Default: F1=5 =>(if F0=1 or 2), the fans remain ON while the evaporator is 5 degrees colder than the
room temperature.
F2: Fans OFF with compressor OFF (according to the value of F0)
Used to decide whether the fans must operate according to the rules set for parameter F0 (with the
exception of the defrost cycle, parameters F3, dd and Fd are displayed) or when the compressor is
active.
• F2=0 => the fans are always ON (F0=0) or when requested by the fan controller (F0=1,2), even when
the compressor is OFF;
• F2=1 => the fans are OFF when the compressor is OFF.
Note: if control with two compressor steps is selected (with or without rotation, H1 = 12 or 13) and
parameter F2 =1, the fans are off when both the compressors are off.
Default: F2=1 => fans OFF with compressor OFF.
F3: Fans in defrost
This is used to decide whether the fans should operate or not during the defrosts.
F3=0 => the fans operate during defrosts;
F3=1 => the fans do not operate during defrosts.
Remember that during the dripping time and post-dripping time, if specifi ed, the fans are always OFF.
Default: F3=1 => evaporator fans OFF during the defrost.
Fd: Fans OFF for post-dripping
The fans, after defrosting, can be stopped for a further period beyond dd (in minutes), defi ned by the
value of Fd. This is useful to allow the evaporator to return to its operating temperature after defro-
sting, thus avoiding forcing “hot” air into the refrigerated environment. In the event of management
by fan controller, the time Fd does not need to be set, as the controller starts the fans again when the
evaporator reaches its operating temperature. If the “fan controller” is active (F0=0), when assigning to
Fd a value other than zero, the fans remain OFF for a time equal to the value of Fd, irrespective of the
evaporator temperature. Default: Fd=1 => 1 minute stop for post-dripping.
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