ENGLISH
IT
ALIANO
FRANÇAIS
DEUTSCH
44
LXTFF01M-IOM-1511
P22:
This parameter de
fi
nes the threshold above which the
delivery water is considered suf
fi
ciently hot for the cut-off
temperature function in heating mode.
In case this function is not wanted, set the parameter to zero.
If, instead, the “heat pump” system has been con
fi
gured, this
threshold protects the heat exchanger from overheating. See
“Heat pump system” section for further information.
P23:
This parameter de
fi
nes the threshold below which the
delivery water is considered suf
fi
ciently cold for the cut-off
temperature function in cooling mode.
In case this function is not wanted, set the parameter to 99.
If, instead, the “heat pump” system has been set this threshold
protects the battery from freezing. See “Heat pump system”
section for further information.
P24:
This parameter sets the time after which the “Dirty Filter
Warning“ is shown; it can be set in the range 0..50 x 100h. As
an example “10“ means that the warning will be shown after 10 x
100 = 1000 hours of fan operation.
When set to 0 the function is disabled.
DESCRIPTION OF EXTENDED CONFIGURATION PARAMETERS
The extended installer con
fi
guration parameters are shown in
table 2 and explained below.
C01 and C02:
These parameters de
fi
ne the thresholds for the
automatic changeover function: if the function is not used this
information is not applied.
The
C01
parameter represents the lower threshold, set in the 0°C
.. 24°C range, while
C02
represents the upper threshold in the
26°C .. 48°C range.
C03
and
C04
: In case a
fl
oating actuator is chosen as regulating
valve, these parameters must be set to the opening time (in
seconds) of the heating output actuator and the
cooling actuator, respectively.
In case instead a PWM valve is chosen, this parameters must
be intended as the cycle-time for the valve or, in other words, the
modulation repetition time, i.e. the time occurring between two
adjacent power pulses applied to the valve.
C05 and C06
: These parameters set the proportional band
amplitude (in °C) when in heating and in cooling mode
respectively.
These paramaters can be set in the 0.8 .. 8.0°C range, yet the
lower limit could be higher, being related to the differential value
stored in
P18
.
C07 and C08
: these parameters are used to set the integral time
respectively for regulation in heating mode and in cooling mode.
When set to zero no integral action is performed.
C09:
This parameter determines the timing (in minutes) of the
cooling output, when controlling an on-off valve (or other load).
This function is enabled only in the “4 pipes”, “electric heater”
and “heat pump” systems: if the cooling output is switched off, it
can be switched on again only after the time con
fi
gured on C09.
A compressor, which is normally not rated to tolerate repeated
switch-offs and switch-ons, can thus be controlled directly.
C10 and C11:
respectively represent the minimum power
percentage of the heating and cooling proportioning valve.
The minimum power is the opening percentage of the
proportional valve below which the fan is kept off to avoid that
the fan blows when the valve has not yet opened the water
fl
ow.
C12:
Sets the number of speeds of the fan motor used in the
system.
Typically Fan motors are 3 speeds type, but this parameter
allows 1 and 2 speeds motors to be managed also.
