AERMEC WMT20, Руководство пользователя

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accuracy.
The fan is driven in a proportional way except when a fixed speed is set
FI1..FI3 . With fixed speed, the fan can be only turned off or turned on at
the fixed 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 configuration
The ‘installer’ configuration 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 configuration menu, turn off the controller,
then keep depressed both buttons ‘
on/off ’ and ‘ menu ’ together for some
seconds, until the word ‘ COn ’ (configuration) appears on the display.
From this state on, each time the “menu” button is depressed a different
parameter is displayed, identified with a ‘
P ’ followed by a number, i.e.
from P01 to P35 .
The end of configuration is indicated by the word ‘ End ’: if now the ‘menu’
button is depressed once again the configuration 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
configuration 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 modified
by first 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 redefined each time according
to the actual parameter allowable range. In order to disable the access
to configuration menu to unauthorized users, an internal jumper,
JP3 ,
(shown in Fig. 3), can be removed; after this any attempt to enter in the
configuration menu will result in an error message.
Configuration parameters explanation
All parameters used in the installer configuration are shown in Table 1 and
explained in the following.
P01 : System type selection.
2 pipes system: when configured for a two-pipes system the controller
drives one valve only, wired at the ‘heating’ output terminal, both when
heating and when cooling, as the same valve is going to control either hot
or cool water flow.
4 pipes system: when configured for a four-pipes system the controller
drives both valves outputs in order to activate either hot or cooling water
according to the actual requirements of the controlled environment.
P02 : This parameter sets the way the controller switches from the cooling
mode (summer) to the heating mode (winter) and vice versa.
The switching can be either manual or automatic:
Manual: The user manually sets the heating or the cooling mode.
Automatic: The controller automatically selects the switching from the
heating to the cooling mode or vice-versa.
This automatic operation is different according to the system type set
with parameter
P01 .
If the system is a 4-pipes one, the controller operates with neutral zone thus
activating the heating or cooling according to the set-point temperature. In
case of a 2-pipes system the controller operates a changeover according
to the supply water temperature. When the supply water temperature is
low (that is below the threshold set with parameter
P23 ) the controller
switches to cooling mode.
On the opposite side, when this temperature is high (that is above the
threshold set with parameter
P24 ) the controller switches to heating
mode. In case the supply temperature is neither too low nor too high the
operating mode is kept unchanged, but it still can be changed manually.
When the supply water sensor is not installed or is not properly working
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