AERMEC GLF10N Manual De Uso E Instalación página 32

VALVE ON/OFF FUNCTION
If there is a shut-off valve (dip1 ON), the position
of the probe can be managed from either
upstream or downstream of the valve (on the
standard position engraved in the heat
exchanger). The substantial difference between
the two consists of managing the ventilation
differently. If the water probe is upstream of the
valve (dip2 ON) or not present, there is a heat
exchanger pre-heating function that enables the
fan after 2'40" from the first valve opening. The
valve in question (for heat exchanger pre-heating
function) is Y1 for a 2-pipe system (dip 6 ON) or
Y2 for a 4-pipe system (dip 6 ON). Then the fan
inhibition time is automatically calculated and
depends on how long the valve has been closed;
it can therefore vary from a minimum of 0'00" to
a maximum of 2'40". This delayed enabling of the
fan compared to the opening of the valve is reset
if the electric resistor is enabled. This is to ensure
greater user safety. The figure below provides an
indication of the operating logic of the valve if the
thermostat is used with thermostat-controlled or
modulated ventilation logic. As seen in the figure,
in HEATING mode the valve is used by exploiting
the terminal's capacity to emit heat even with
the fan off (chimney effect). On one hand, this
allows use of the chimney effect, and on the other
hand it makes it possible to prevent the valve
from continuously opening and closing (it has a
response time of a few minutes), and to therefore
have the water in the terminal always circulating
during normal operation. In COOLING mode, the
thermostat control of the valve does not coincide
with that of the fan. This way it is possible to make
better use of the cooling capacity of the machine
and make a more accurate check of the ambient
temperature.
Heating setting
Cooling setting
Valve
Dead band
If the thermostat uses continuous ventilation, the
operating logic of the valve is that shown in the
following figure.
Heating setting Cooling setting
Valve
Dead band
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AGLFI10NFJ 2006_5905226_03
CHANGE OVER HOT/COLD MODE
Changing the season based on water
If the thermostat is configured for use without
a valve (dip1 OFF) or with a probe upstream of
the valve (dip2 ON), then the water temperature
detected is the temperature actually available on
the terminal and therefore the season is forced in
Heating or Cooling based on its temperature. The
seasonal thresholds are those in the figure below
which also have the meanings shown for dip 4.
The ventilation is activated only if the temperature
of the water is suitable for the Heating or Cooling
mode. This helps prevent undesired cold
ventilation in the winter season, and helps control
the switching on and off of all of the terminals,
based on the actual state of the water available
(centralised control of On-Off commands and
Heating-Cooling commands).
Freddo
Changing the season based on air
There are system types that provide the change of
season based on air. They are:
• 2-pipe system with water probe downstream
of the valve.
• All 2-pipe systems without water probe.
• 2-pipe systems (cooling only) + Heater
(heating only)
• All 4-pipe systems.
The season is changed based on the following
criterion:
• Cooling mode: if the room temperature
measured is lower than the chosen setpoint
in an interval equal to the dead band (2°C or
5°C) the system passes to heating mode.
• Heating mode: if the room temperature
Valve
measured is higher than the chosen setpoint
in an interval equal to the dead band (2°C or
5°C) the system passes to cooling mode.
The dead band is decided by or dip 5, i.e. dip
5 OFF has a dead band of 5 °C while with dip 5
ON the dead band is 2°C.
Valve
Ventilazione
Caldo
disabilitata