emmeti TAM-15 Manual De Instalacion Y Uso página 44

regulator is only driving one valve wired at the cooling output and one
integrating electric heater wired at the heating output.
The relevant wiring diagram is in Fig. 12e and Fig. 12f. The valve is driven
as in a two pipes system: according to the heating or cooling setting of the
controller the relevant flow of hot or cool water is managed.
The electric heater is turned on as an additional (integrating) heat source
whenever, in heating mode, the room temperature falls below the set point
temperature by a ∆ setpoint that can be configured in parameter C21.
In cooling mode it is possible to have a neutral zone regulation by setting
a neutral zone width greater than zero on P20. In this case cooling is
achieved by activating the valve, while heating by activating the electric
heater.
In this type of system it is suggested to set a delay on the fan switch-off
on P22, so that when the electric heater is switched off, the fan keeps
running to cool the heater down.
When the fan motor is proportional driven, for the same purpose of cooling
the heater down, it is possible to set on parameter C14 a minimum speed
that will be maintained when the electric heater is on.
In case the cut-off temperature function is used in this system, the fan will
never be inhibited while in heating mode, since the electrical heater will be
turned on in advance instead.
UNDERFLOOR HEATING SYSTEMS WITH FAN COIL FOR COOLING
The thermostat can be configured to manage a special system which uses
different means of temperature conditioning depending on whether heating
or cooling is needed in the room.
For example, in summer season a fan coil can be driven for room cooling by
controlling the fan and the cold valve, while in
winter season it could only drive the hot valve of the underfloor system
always keeping the fan coil fan off. The thermostat can receive
information on the summer/winter status directly from the heating system
on an input (3 or 4), in this way there will be an automatic management of
the seasonal changeover, with an automatic recall of the climate mode and
setpoint of the respective season.
To configure this type of system, set P01 = 1 e P03 = 4.
ECONOMY FUNCTION
The "Economy" function allows to temporary set an energy saving
mode through a reduction of the actual setpoint 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 set to 0.0 the Economy function is actually
disabled. The Economy mode is activated by the " " button, as described
in the "Description of controls" section. The Economy mode can be
remotely activated in centralised mode, even for multiple thermostats,
using the inputs to terminals 3 or 4 (see parameters C17 and C18).
Since the thermostat is sensitive to signal status changes and not to the
level, use the " " button to change the activation status of the Economy
function, even when it is forced by the centralised signal.
When the Economy function is activated (" " icon on), the fan speed is
limited to the first or to the value set on parameter C11 for fans with a
proportional control.
DIRTY FILTER WARNING FUNCTION
Fan-coils and other devices including a fan are often equipped with a
filter 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 filter warning" function
has been enabled.
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