Additional Functions - AERMEC TX Serie Mode D'emploi

ADDITIONAL FUNCTIONS

ENABLING VENTILATION
The figure showing season changeover (water side) and ventilation enabling indicates not only the season changeover (water side) thresholds but
also the ventilation enabling thresholds in Heating mode (Minimum value check) and Cooling mode (Maximum value check). Depending on the
setting of Dip 4, Normal band (heating enabling at 39°C, cooling enabling at 17°C) or Reduced band (heating enabling at 35°C, cooling enabling
at 22°C) is selected.
The absence of a water probe for 2-pipe systems prevents not only season operating changeovers but also Minimum water temperature checks in
Heating and Maximum water temperature checks in Cooling, so ventilation is always active.
In the case of a 4-pipe system with just one water probe, the probe is only used to check the Minimum ventilation value in Heating mode. If you
also want to check the Maximum value in Cooling mode, a probe must be installed on the cold water coil as well (the TX/TXI thermostat can
manage two water probes).
ENVIRONMENT PROBE MANAGEMENT
The TX/TXI thermostat is fitted as standard with a built-in air probe. In order to improve the possible control of the room temperature, it is
possible to install an external air probe to be installed on the fan coil or in the environment.
The control manages the air sensors as follows:
DIP 11
OFF
OFF
ON
ON
ANTI-FREEZE PROTECTION
The anti-freeze protection function makes sure the ambient temperature never falls to freezing values (even when the selector is OFF). If the
temperature falls below 7°C, the thermostat works in HEATING with a set value of 12°C and AUTO ventilation (as long as the water temperature
allows it). If there is no water probe, or continuous ventilation is enabled, the fan is always active. If there is a valve and an upstream water
probe, or no water probe, the heat exchanger undergoes a pre-heating cycle in any case. The thermostat quits anti-freeze mode when the
ambient temperature rises above 9°C.
MICROSWITCH LOGIC
The microswitch can have several separate functions depending on the position of Dip 8 and Dip 9 (SW1):
DIP 8 in OFF (dip 9 in OFF: fan coil without radiant plate)
The microswitch has the function of completely prohibiting the fan when it is in the open state, which mechanically corresponds to the closed fin
position. Where the electric resistance is active, when the microswitch is opened, ie closing the flap, it comes however, a post-ventilation was
carried out to prevent the resistance from overheating (This is the only case where ventilation is enabled despite the microswitch either open).
Dip 8
OFF
OFF
ON External season changeover
ON External season changeover
DIP 8 in ON (dip 9 in OFF: fan coil without radiant plate)
The microswitch has the function of change of season, this mode of use is necessary for i FCX / FCZ DualJet fan coils or in all the applications
where you want to have the change of season from external contact managed by a centralized system.
DIP 9 in ON
For the fan coils that manage the radiant plate, the microswitch has the function of inhibiting
the only ventilation. OFF mode if this is closed (except in the case where the thermostat is in antifreeze mode or the room probe is faulty). This
contact can be useful for managing, for example, inputs such as window contact, faulty circulation pump, etc.
ECONOMY FUNCTION
The Sleep function on the TX/TXI thermostat is available if the thermostat is interfaced with a presence sensor (with normally open logic)
connected to its SP input.
In practice, this function varies the fan coil adjustment setting if there is nobody in the room in question (lowering the value if heating mode is
active, or increasing it if cooling mode is active). The purpose is to ensure energy savings. More specifically, if the TX/TXI thermostat board is
connected to a presence sensor, the SP input logic is as follows:
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AMBIENT AIR PROBE PRESENCE
Function
External enabling
External enabling
SP input
Open
Closed
NO
YES
NO
YES
Microswitch input
Closed
Open
Closed
Open
Heating
Dip 7 Off Dip 7 On Dip 7 Off
∆=0 ∆=0
∆ = 5°C ∆ = 2°C ∆ = -5°C
ADJUSTMENT PROBE
Built-in air probe
External air probe
Built-in air probe
Average of the value read by both probes
Machine status
ON
OFF
Cooling mode
Heating mode
Cooling
Dip 7 On
∆=0 ∆=0
∆ = -2°C