Action Clima CR13 Manual Del Usuario página 26

temperature, the two words FIL-TER alternating. If any key is depressed
the warning disappears and the display returns to its normal mode.
Whenever the regulator is turned off and then on again, the warning will
reappear. This is an extremely useful function for the maintenance service,
which can easily check whether the !lter needs to be cleaned.
In order to reset the warning and the relevant time-counter, once the
cleaning has been made, just keep depressed the speed button for at least
10 seconds, until the regulator will con!rm to have reset the warning by
showing again the words FIL-TER.
Temperature regulation
This device can drive in a proportional way the fan speed in order to
control room temperature with the highest comfort and energy saving.
Nonetheless each different environment needs a different set for some
parameters in order to get an accurate regulation.
Parameters devoted to the regulation accuracy are:
- Proportional band: P26 and P27
- Integrative time: P28 and P29
For each of the settings two parameters are available, because the user is
allowed to set different values for heating and cooling mode. Proportional band,
measured in °C, is intended as the difference between set-point and room
temperature which is needed to change the fan speed from zero to maximum.
The narrower the proportional band, the fastest is the regulator to
counteract temperature variations in the room.
Yet a value for this parameter too 'narrow' can result in room temperature
oscillations or system instability. A value too 'wide' could result in the
impossibility to reach the set-point temperature in the room. When the
integrative time is set to zero, no integral action is made and therefore
the regulation is purely proportional (P type). When an integrative time
different from zero is set the resulting regulation is made of a Proportional
plus an Integral action (P + I type). The smaller the integrative time, the
greater the in#uence of the integral action and vice-versa: with a greater
integrative time the resulting integral action is softer.
A too soft or null integral action could result in the impossibility to reach the
set-point temperature, meanwhile a too strong integral action could possibly
generate oscillations in the room temperature. It is necessary to adjust these
parameters according to the actual environment in which the regulator is
installed for the purpose of the best possible regulation accuracy.
The fan is driven in a proportional way except when a !xed speed is set
FI1..FI3. With !xed speed, the fan can be only turned off or turned on at
the !xed speed; there is no proportional regulation, actually it becomes ON-
OFF regulation with relevant hysteresis set on parameter P19.
The fan will be turned on only when the valve is open, in order to avoid the
fan operation together with a closed valve.
Installer con!guration
The 'installer' con!guration is used to setup the controller in order to get
the best regulation in conjunction with the type of heating/cooling system
installed. In order to enter the con!guration menu, turn off the controller,
then keep depressed both buttons 'on/off' and 'menu' together for some
seconds, until the word 'COn' (con!guration) appears on the display.
From this state on, each time the "menu" button is depressed a different
parameter is displayed, identi!ed with a 'P' followed by a number, i.e.
from P01 to P35. The end of con!guration is indicated by the word 'End':
if now the 'menu' button is depressed once again the con!guration is
saved in a non-volatile memory and the controller jumps into the normal
operation mode. In case the 'on/off' button is depressed, at any time the
controller exits from the con!guration menu, without saving the changes.
When parameters are examined, if the 'speed' button is depressed once,
the actual value of the parameter is displayed.
When the value is shown press again the 'speed' button to change the
value. Parameters from P01 to P11 can be set by pressing several times
in sequence the 'speed' button until the desired value is reached. The
following parameters, being variable in a wider range, can be modi!ed
by !rst pressing once the 'speed' button, so that the 'modify parameter'
mode is entered, then turning the knob to modify the desired value. Upper
and lower limits for the knob regulation are rede!ned each time according
to the actual parameter allowable range. In order to disable the access
to con!guration menu to unauthorized users, an internal jumper, JP3,
(shown in Fig. 3), can be removed; after this any attempt to enter in the
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