AERMEC Omnia UL PC Manuel D'utilisation Et D'installation page 14

OPERATION
OMNIA UL PC fancoils are delivered ready to operate in standard
configuration, though can be adjusted by the installation technician
to specific requirements by means of dedicated accessories and con-
figuration of functions at the internal dipswitches (see DIPSWITCH
CONFIGURATION).
Response to controls is immediate, except in special cases.
Unit types
OMNIA UL PC fancoils are designed for twin-tube units, in the fol-
lowing types:
- without valve;
- with 2-way valve (water probe below valve);
- with 3-way valve (water probe above valve).
Ventilation
Ventilation speed can be controlled either manually by setting the
selector switch A to position V1, V2 or V3 (the fan operates in on-off
cycles according to the speed selected), or automatically when the
selector switch is set to the AUTO position (fan speed is controlled by
the thermostat according to room temperature detected).
On systems with a valve (dip1 = ON) and a Water Probe installed
upstream of the valve (dip2 = ON), a delay (maximum 2'40'') can be set
between the valve switching on and the fan starting up (pre-heating of
the heat exchanger).
Ventilation can only take place with the louvers open. On models
where the louvers are not motorised these must be opened manually.
Season changeover
The thermostat changes seasonal operation automatically.
Season changeover takes place according to the water temperature
detected in the unit.
According to the dipswitch settings, two types of season change (water
side) are possible:
- Dip1 = OFF, Dip2 = OFF (standard configuration) with minimum/maxi-
mum temperature control only;
- Dip1 = ON, Dip2 = ON (configuration with three-way valve and probe
before the valve) with minimum/maximum temperature control and
coil preheating (fan operation delay maximum 2'40").
n the case of special units with water probe below the valve or fitted
with 2-way valve, season change takes place from the air side, throu-
gh operation of the temperature selector switch. Though this setting
allows use of the fancoil in pre-existing 2-way valve plants, it is not
recommended, given that it hampers the operation of the electronic
thermostat (the Heating/Cooling mode status display by LED is altered,
depending on the temperature selected and the room air temperatu-
re).
Water temperature controls
The thermostat only enables fan operation when the water temperatu-
re is suitable for Heating or Cooling mode.
Both the hot and cold starting up temperatures can be set to suit the
conditions under which the system operates.
The hot starting up threshold can be selected using Dip 5: OFF position
for normal Heat (39°C) and ON position for reduced Heat (35°C).
The cold starting up threshold can be selected using Dip 6: OFF posi-
tion for normal Cold (17°C) and ON position for reduced Cold (22°C).
If the water temperature is not suitable for the operating mode
selected, LED lamp C on the control panel flashes alternately pink, red
and blue next to the relative mode; this display is switched off when
Dip1 = ON and Dip 2 = OFF.
Valve control
La valvola può essere controllata in due modalità:
- optimised: this mode exploits the capacity of the fancoil (Heating)
to supply heat even when fan operation has been shut down; during
Cooling, ventilation continues for control of room temperature by the
valve.
- normal: the valve opens or closes, depending on whether the fan
starts up or shuts down.
Probe correction
The required correction to be applied to the ambient probe can be
selected.
Frost Protection
This function prevents room temperature from dropping below an
ambient temperature of 7°C (even when the fancoil is off and selector
switch A is in the OFF position).
In the event that room temperature drops below 7°C, the thermostat
starts up the fancoil in heating mode at a temperature setting of 12°C
and fan operation set to AUTO (if permitted by water temperature, the
unit is connected to the power supply and the louvers are open, in the
case of manual units).
Frost protection mode is deactivated when room temperature rises
above 9°C.
Emergency mode
In the event of failure of the SA ambient sensor, the thermostat goes
into Emergency mode as indicated by the yellow LED (D) flashing.
Under these conditions the control panel operates in the following
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IULPCLJ 1810 - 6976408_05
way:
- with selector switch (A) in OFF position: la valvola acqua è chiusa ed
il fan off.
- with selector switch (A) in AUTO, V1, V2 or V3 position: la valvola
acqua è sempre aperta ed il the fan performs on-off cycles; in this case,
the power supplied by the terminal is controlled manually by means of
the temperature selector switch (B): rotate the switch to right to incre-
ase cycle duration, or to the left to reduce it.
Cold plasma
The Cold plasma air purifier is activated at the same time as the venti-
lation whether hot or cold.
The functioning of the device is indicated by a yellow Led coming on
the control panel.
The Cold plasma purification breaks down the water and oxygen
molecules normally present in ambient air ("dampness" and "oxygen"),
into positive and negative ions. These ions liberated into the air will
stick to the molecules of the polluting substances and by being recom-
bined (once activated) decomposes them into non-toxic sub-products
(water, oxygen and carbon dioxide etc..).
PACKAGING
The fancoils are sent with standard packaging consisting of protective
shells and boxes.
INSTALLATION OF THE UNIT
WARNING: before carrying out any work, put the proper individual
protection devices on.
WARNING: before carrying out any work, make sure the electrical
power is unplugged.
CAUTION: electrical connections, the installation of the fan coils and
their accessories must only be carried out by people with the proper
technical and professional qualifications for the installation, conver-
sion, expansion and maintenance of the machinery and able to check
that it is working properly and safe.
Install the fancoil in a position that will facilitate routine (filter cleaning)
and special maintenance, and easy access to the air breather valve on
the side of the unit (connections side).
Note that certain operating conditions could lead to the formation of
condensate on the unit housing with subsequent dripping, or faults to
the water circuit or condensate drainage could cause liquids to over-
flow. For these reasons, avoid installing the unit on surfaces damagea-
ble by moisture.
Make sure that the unit is installed in a site where the ambient tempe-
rature is inside the minimum and maximum limits 0 - 45°C (<85% R.H.).
To install the unit, proceed as follows:
- Remove the cover by unscrewing the screws in the head piece
under the doors.
- In the case of wall mounting, ensure a minimum distance of 80 mm
from the floor. For free-standing installation on feet, refer to the
instructions provided with the unit.
- Use expansion plugs (not supplied) when mounting the unit on the
wall.
- Make water connections. To make the air vent from the coil easier,
you are recommended to connect the outlet water pipe with the
connection positioned on the top, the possible inversion will not
affect the proper unit operation.
The position and diameter of water connectors are given in the
dimensional data.
Insulation of water lines is recommended. Install the condensate water
collection tray (optional accessory) to prevent dripping during coo-
ling operation.
N.B.: Use a tool to break the push-out in the drip tray (water connec-
tion side) before connecting the condensate drainage.
Size and arrange the condensate drain system in such a way as to
ensure a gradient of at least 1%. If drainage is emptied into the
sewerage system, fit a siphon to prevent the return of unpleasant
odours into the room.
Test the seal of water and condensate drainage connections.
- Fit accessories (as applicable).
- To modify the settings of the electronic thermostat, modify the dip
switches from the relevant window at the back of the control panel,
(see the "DIP-SWITCH SETTINGS" chapter).
- Make all wiring connections as shown in wiring diagrams and the
section "ELECTRICAL CONNECTIONS". Connect the control panel to
the connector on the inside of the fancoil, then earth the unit.
- Check the proper functioning of the fan coil by means of the
Autotest procedure.
- Re-install the casing.
- Check that the fancoil operates correctly.
WARNING: the filter may only be removed from the sealed box and
fitted to the unit at the time it will be used for the first time.