Operation - AERMEC Omnia UL 11 N Manuel D'utilisation Et D'installation

OPERATION

The OMNIA UL_N fan coil concentrates
hi-tech and highly functional features that
make it the ideal means of climate control
in every room.
OMNIA fan coils are designed for indoor
use.
The supply of climate-controlled air is imme-
diate and distributed throughout the room.
OMNIA UL_N generates heat if inserted in
a heating system with boiler or heat pump,
but it can also be used in summer as an
air conditioner if the heating system has a
water chiller.
The quality of the treated air is guaranteed
by a special, electrostatically pre-charged
filter which absorbs and holds back the
suspended dust particles. With the fan coil
switched off, the closed fin prevents any
dust or foreign bodies from entering.
The removable drip tray and fan volute
Description of the UL_N fan coil functions
• Type of system
The OMNIA UL_N fan coils are designed for
2-pipe systems and are configured:
- without valve;
- with 2-way valve or water probe down-
stream from the valve;
- with 3-way valve and water probe down-
stream from the valve;
• Operation in TTL network
The OMNIA UL_N "master" is fitted with
an electronic card with microprocessor,
able to manage a network of a further 5
fan coils over a maximum network length
of 30 metres. The settings (or set points)
of the panel on the main fan coil (master)
are received by the other fan coils (slaves)
which will operate autonomously.
The OMNIA UL fan coil with slave function
must be fitted with the electronic card
with microprocessor VMF-E0 or VMF-E1
(an accessory).
All the fan coils of the TTL network must
have the same type of configuration.
Example: all standard, all with purifiers
(Cold plasma and/or germicidal lamps), or
all with an additional coil (electric or with
water).
The slave fan coils work with the settings
dictated by the master fan coil. On the
basis of the settings received from the net-
work and the ambient conditions detected
by the probes, the electronic card on each
single slave fan coil acts (independently
from the other fan coils) to switch the ven-
tilation on and off in order to create the
conditions requested by the user for that
specific room.
• Cooling operation
Cooling operation requires a water circuit
with chiller.
• Heating operation
Heating operation requires a water circuit
with boiler, heat pump or solar system.
• Changeover (seasonal change)
The thermostat automatically selects the
operating mode (Heating/Cooling), if that
mode is permitted (water probe and set-
tings).
- Normal band: heating at 39°C; cooling at
17°C.
- Reduced band: heating at 35°C; cooling
at 22°C.
- Dead band: can be selected at 5°C or 2°C.
Water side changeover
- Water temperature checks
Enabling of water side ventilation (only active
with water temperature probe). The ther-
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ensure thorough cleaning of the unit (by
specifically trained personnel), essential for
installations in venues subject to crowding
or in those with special hygiene require-
ments.
The quietness of the new centrifugal fan
assembly is such that at normal speeds of
use you cannot hear when the OMNIA
UL_N cuts in. The use of the electronic
control panel avoids the annoying noise
typical of mechanical thermostats.
The control panel is protected by a flap on
the head.
OMNIA UL_N is equipped with an electron-
ic control panel with microprocessor. It's
extremely intuitive and user-friendly, with
just two knobs - one to increase or decrease
the temperature, and the other to switch on/
off and set the ventilation speed.
The settings made on the control panel can
mostat identifies the ventilation enabling
threshold in Heating mode (minimum con-
trolled) and Cooling mode (maximum con-
trolled); with the dip-switches it is possible
to choose between two temperature bands.
Air side changeover
If the actual room temperature is lower
than the set point by a value equal to the
dead band, there is an automatic swap to
Heating operation.
If the actual room temperature is higher
than the set point by a value equal to the
dead band, there is an automatic swap to
Cooling operation.
In the fan coil networks, the values of the
dead band are only those configured on
the master fan coil
• Pause due to power failure
After a power failure, the unit restarts with
the settings that were active prior to the
pause.
• Delayed start-up
The unit can begin ventilation some time
after start-up - usually up to 2'40" (pre-
heating function).
• Anti-freeze protection
Commands on OFF position. The fan coil
can restart in heating mode (setting 12°C)
if the room temperature falls below 7°C
and the temperature of the water in the
system is suitable.
In the fan coil networks, the slave fan coils
can activate the anti-freeze protection
regardless of the settings on the master fan
coil.
If the anti-freeze protection is active on the
master fan coil, all the other slave fan coils
will also adopt a setting of 12°C, regardless
of their ambient conditions.
• Room temperature probe
If the room temperature probe on the slave
fan coils is faulty, the temperature will be
measured by the probe of the master.
•Ventilation
3-speed ventilation can be commanded both
manually and automatically.
- Manual, with the selector on V1, V2 and
V3. The fan is used with ON-OFF cycles at
the selected speed.
- Automatic, with the selector on AUTO. The
fan speed is managed by the thermostat,
on the basis of the ambient conditions and
the fan coil configuration.
Thermostat settings:
- 3-level thermostat, with the selector
on AUTO. The fan maintains the speed
relating to one of the three predeter-
be transmitted (without additional inter-
faces) to a network with up to 5 fan coils,
all equipped with their own electronic
card. The fan coils in the network will each
adapt their own operation to the environ-
mental conditions detected in that specific
room.
The OMNIA UL_N fan coil has been
designed to meet all system requirements,
thanks also to its wide range of acces-
sories.
Easy installation with reversible hydraulic con-
nections during installation.
Full compliance with accident prevention
regulations.
Routine maintenance is reduced to peri-
odic air filter cleaning with a vacuum
cleaner.
mined steps, depending on the difference
between room temperature and set point.
Once it has reached the set point, the fan
will switch off.
- Modulated output thermostat, with the
selector on AUTO. The fan makes cycles,
alternating the speeds according to the dif-
ference between room temperature and set
point. Once it has reached the set point, the
fan will switch off. This setting is not com-
patible with continuous ventilation manage-
ment.
• Ventilation management
Ventilation settings:
- Continuous ventilation. Ventilation is
always active. The temperature is con-
trolled by intercepting the flow of water
to the fan coil. This function requires the
presence of a water valve (accessory), and
cannot be activated simultaneously with
the "modulated output thermostat" option.
- Thermostat-controlled ventilation.
Ventilation switches off when the set tem-
perature is reached (set point).
• Valve adjustment logics
With the Thermostat-controlled ventilation
or Modulated output thermostat setting,
the valve is managed with the following
logics:
- Heating - the valve is managed to exploit
the stack effect of the fan coil, and to pro-
vide heat even with the fan switched off.
These settings also reduce the number
of valve openings and closings; with hot
water circulating in the fan coil, a request
from the thermostat will produce ventila-
tion immediately.
- Cooling - to make the best use of the unit's
cooling capacity and perform a more
accurate check on the room temperature,
the valve opening does not coincide with
ventilation.
• Water probe
There is a water temperature probe in the
heat exchanger of the unit.
The slave fan coil can work without the
water probe: if it is absent or faulty, the
temperature will be measured by the mas-
ter probe along. In this case, ventilation is
always enabled on the slave fan coil.
The water temperature probe can be posi-
tioned downstream or upstream from the
shutoff valve, so also the dip-switches on
the card must be set. The difference lies in
the management of the ventilation of the
fan coils with valve.
Setting the dip-switch as a probe down-
stream of the valve, ventilation start-up