Action Clima CR13 Manual Del Usuario página 29

exchanger to dissipate the residual heat.
P23 and P24: These parameters set the thresholds for the automatic
changeover operation: in case this function is not performed these two
parameters are not used. Parameter P23 is the lower threshold and can
be modi!ed in the range 0 .. 24°C, meanwhile P24 is the upper threshold
in the range 26 .. 48°C.
P25: This parameter sets the threshold for the cut-off temperature
function: this function is active in heating mode when a supply water
sensor is wired at the proper terminals. In case this function is not desired
the parameter should be set to '0'.
P26 and P27: These parameters respectively represent the proportional
band of the adjustment when the thermostat is set either in heating mode
or cooling mode. Fig. 7 graphically shows the effect of the proportional
band on the output.
P28 and P29: these parameters are used to set the integrative time
respectively for regulation in heating mode and in cooling mode. When set
to zero no integral action is performed.
P30 P31 P32: These parameters de!ne the speed regimes associated to
the !xed speeds settings FI1, FI2, FI3, as percentage of the full speed.
P33 and P34: These parameters respectively represent the lower limit
and the upper limit of the output proportional signal of the fan. Parameters
can be changed within the range 0 .. 10.0 V. This parameter permits to
customize the output voltage; this can be useful to limit the minimum and
maximum speed of the fan-coil motor.
P35: 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.
Room temperature correct acquisition
For a correct temperature acquisition it is mandatory to remember and
apply the following tips:
- In order to have an accurate room temperature acquisition the controller
must be installed far from heat sources, airstreams or cold walls (thermal
bridges).
When the remote sensor is used in conjunction with the controller, then
this note is to be applied to the remote sensor itself.
- When a remote sensor is used, do not use the same duct for signal
wires and power wires, as the temperature reading accuracy could be
impaired.
Wirings can be usefully made with bipolar screened cable , whose screen
is only wired at the regulator side (terminal 14) with 1,5 mm² minimum
cross section and 15 m. maximum length.
- In the normal operation with internal sensor, the controller conditions the
signal acquired according an exclusive algorithm designed to compensate
for the heat generated from its internal components.
From this derives that the temperature value displayed at turn-on can be
actually lower than the real one.
This must be considered a normal behaviour: anyway in some minutes
this difference should decrease down to zero.
- In case the controller should drive with its outputs large loads (whose
current is close to the maximum rated value) it might happen that the
internal components temperature raise.
This temperature increase could in turn in#uence the room temperature
acquisition when the internal sensor is used.
This problem is not evidenced when the remote temperature sensor is
used.
- When, for any reason, the room temperature accuracy is considered
unsatisfactory (due to the above mentioned reasons), it can be corrected
with parameter P12.
- When the controller is powered with 230V~ it is mandatory to
respect the live and neutral (L and N) position during wiring.
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