Action Clima CR13 Manual Del Usuario página 25

temperature in the fan-coil exchanger with NTC type sensors. The room
temperature is acquired and displayed with the above mentioned resolution
in the range 0 .. 40°C.
In case the room temperature falls outside the operating range, the display
shows 'Or' (out of range). In case the sensor acts as an open or a short
circuit the display shows 'EEE' (error): no regulation is performed in this
situation and all outputs are set as inactive.
The controller features an internal temperature sensor but an input for a
remote sensor is also available. Through parameter P11 in the 'installer
con!guration' one of these two sensors is selected for the regulation
purpose. The supply water temperature in the fan-coil is acquired through
a remote sensor and can be displayed with 1°C resolution in the 0 .. 99°C
range. In case the acquired temperature falls outside the operating range
mentioned, the display will show the letters 'Or' (out of range). In case
the sensor acts as an open circuit or a short circuit the display will show
the letters 'EEE' (error) and all functions related with this data are not
performed. In case the system doesn't require the supply water sensor the
user is allowed not to install and wire it. For what is related to the supply
water sensor activation please refer to the explanations in paragraph
'Cut-off temperature function'.
Cut-off temperature function
The cut-off temperature function is used to inhibit the fan operation
whenever, but only in heating mode, the supply water is not hot enough. In
order to enable this function a supply water sensor (or even, alternatively,
a bimetallic thermostat) must be wired to the proper terminals. In case the
supply pipe sensor is used, the relevant threshold for this function (i.e. the
value for the controller to decide when the supply water is hot enough) is
de!ned by parameter P25.
In case this function is not needed parameter P25 can be set to a very low
value (as an example '0').
On the other hand when for this function a bimetallic thermostat is used, it
is mandatory to set parameter P08 to value '2': in this case the fan will be
enabled only when the thermostatic contact is closed. When this type of
thermostat is used the supply water temperature cannot be displayed, nor
the automatic changeover function can be performed. Please refer to the
section 'Installer Con!guration' to set the parameters related to the above
described functions. When the fan is stopped by the cut-off temperature
function the 'fan' symbols on the display #ash.
Economy function
The 'Economy' function allows to temporarily set an energy saving
mode through a reduction of the actual set-point temperature by a step
(con!gurable) when in heating mode, or increasing it by the same step
when in cooling mode.
The value for this reduction step is set with parameter P18: when this is
set at 0.0 Economy function is actually disabled. Economy saving mode is
started from the menu button, as explained in the 'Operation' section. In
case the remote heating/cooling mode is not con!gured, terminal 7 can be
used to start the 'Economy' function from remote even at the same time
on several different regulators. When the wire connected at this terminal
is linked with the Live voltage of power supply, the function is started;
the same function is terminated when this terminal is left unconnected
(open). The regulator detects the state changes of the terminal, not the
level itself, therefore it is always possible to override the Economy state
set by terminal 7 with a manual action on the menu button.
When Economy mode is active, being an energy saving mode, the fan motor
speed will be limited to the lowest one (!rst) or at the value set in P30 in
case of fan proportionally driven.
Dirty !lter warning function
Fan-coils and other devices including a fan are often equipped with a
!lter for the air in the suction path, which needs a periodical maintenance
and cleaning or replacement. This regulator can warn the user when the
maintenance has to be made, provided the 'Dirty !lter warning' function
has been enabled.
The function is enabled by setting the time-to-maintenance value (each unit
means 100 hours) in parameter P35: the regulator will count the operating
time of the fan and when the value stored in P35 (x 100 hours) is reached
it will warn the user through a message on the display.
In this situation the regulator shows on the display, in place of the room
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