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APPENDIX
Supply water sensor input
This controller features an input for a sensor mounted on the water supply
pipe: when this sensor is used the controller can automatically understand
whether it should be working in ‘cooling’ mode or in ’heating’ mode: this
function is called ’changeover’ and it is based on the water temperature.
The water temperature is also used to perform the ‘cut-off thermostat’
function: this means that when the controller is in heating mode but the
water in the pipe is too cold then the fan is automatically stopped until the
water temperature goes above a set threshold.
At this input can alternatively be wired a bimetallic thermostat for
the same ‘cut-off’ function. In case this function is not required, the
same input can be used to wire a window contact, which will stop the
temperature regulation whenever in the room the window will be open.
When the regulation is inhibited by the window contact, symbols related to
the active outputs will flash on the display.
Note: there are some limitations for the window contact use: please
read carefully the ‘WARNING’ section.
Temperature acquisition
This controller acquires both the room temperature and the supply water
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
configuration’ 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
defined 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 Configuration’ 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 flash.
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
(configurable) 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
ENGLISHESPAÑOL DEUTSCH ITALIANOFRANÇAIS
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