AERMEC Omnia UL 11 N Manual De Instrucciones E Instalación página 29

(changeover) is dependent on the tempera-
ture of the air in the room.
Setting the dip-switch as a probe upstream of
the valve, ventilation start-up is dependent
on the temperature of the water in the sys-
tem. With this setting, the pre-heating func-
tion is activated, and there is a ventilation
start-up delay of between 0" and 2'40".
To position the bulb on the delivery pipe
upstream of the valve, the standard water
probe must be replaced with the SW3N
probe accessory.
• External contact
The card offers the possibility of a con-
nection with an external contact. With a
closed external contact, the unit is con-
figured as in the thermostat OFF position
(except when the thermostat is in the Anti-
freeze Protection position or when the
ambient probe is absent or faulty). This
contact can be used to manage inputs such
as a remote ON-OFF command, a pres-
ence sensor, a window contact, a faulty
Water probe present
Water side changeover
Pre-heating delay
With valve
Minimum and maximum controls
- Dynamic correction A:
Without valve
OPERATING ENVIRONMENT
The units are designed for installation in closed environments in conditions of 'urban',
non-marine atmosphere with non-corrosive and non-dusty characteristics.
Under no circumstances the following concentrations of pollutants in the air, in which
the unit must operate, shall be exceeded:
SO <0,02 ppm
2
H S <0,02 ppm
2
NO,NO <1 ppm
2
NH <6 ppm
3
N O <0,25 ppm
2
The unit should not be installed in locations characterized by the presence of flammable
gases or acidic or alkaline substances.
Otherwise the coils and the internal components of the equipment could suffer serious
and irreparable damage from corrosi
WARNINGS FOR THE QUALITY OF THE WATER CIRCULATING IN
THE COILS
It is recommended to perform an analysis of the water circulating in the coil focusing on
the research of the possible presence of bacteria (detection of iron bacteria and micro-
organisms that can produce H2S or chemically reduce sulphates) and on the chemical
composition of the water, to prevent corrosion and fouling inside the tubes.
The water circuit must be supplied and replenished with treated water that does not
exceed the threshold levels indicated below.
circulation pump signal, etc.
In fan coil networks, only the external con-
tact of the master fan coil is enabled. If
the master input is closed, all the slave fan
coils of the network are switched off.
• Microswitch contact
The card offers the possibility of a connec-
tion with the Microswitch contact located
on the delivery fins. With the fins closed,
the fan coil is 100% OFF.
In fan coil networks, when the fin of the
master fan coil is closed, ventilation stops
but the electronic thermostat card and the
other fan coils in the network carry on
working.
• Emergency operation
In the event of a faulty probe, the electronic
card can automatically detect the prob-
lem and enable an emergency program to
avoid any inconvenience for the user, who
is immediately informed of the fault (LED
indicator lights).
• Ambient probe correction
Upstream water probe
Water probe not fitted
Air side changeover
Pre-heating delay
No minimum and maximum
active control
Fixed correction
Configuration not used
To obtain a better room temperature adjust-
ment, the thermostat applies special
algorithms to correct the ambient probe
installed on the fan coil; the probe is in
contact with the housing, and is therefore
influenced by it.
The dynamic correction is a correction algo-
rithm of the ambient probe which takes
into account the particular operation status
of the fan coil in any one moment. More
precisely, there are two possible cases of
dynamic correction:
- Dynamic correction A: in the case of sys-
tems without a valve (or with a down-
stream probe), the correction depends on
the water and ambient temperatures.
- Dynamic correction B: in the case of sys-
tems with a valve and an upstream probe,
the correction depends on the valve and
on the water and ambient temperatures.
Unlike the previous correction, this one
uses different time constants to calculate
the appropriate correction (because the
housing is influenced in a different way).
Downstream water probe
Water probe present
Air side changeover
No ventilation delay
Minimum and maximum controls
active
- Dynamic correction B:
Water side changeover
No ventilation delay
Minimum and maximum controls
active
- Dynamic correction B:
Carbon dioxide [CO ] < 30 mg/litre
2
Resistivity 20 Ohm∙m < Resistivity< 50 Ohm∙m
pH 6,9 < pH < 8
IULNIJ 1711 - 4528500_01
Water probe not fitted
Air side changeover
Pre-heating delay
No minimum and maximum
control
Fixed correction
Air side changeover
No ventilation delay
No minimum and maximum
control
Fixed correction
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