Functioning Characteristics; Packaging; Unit Installation - AERMEC Omnia ULI 16 PC Manual De Instrucciones E Instalación

FUNCTIONING CHARACTERISTICS

The OMNIA ULI_PC fan coils are supplied ready to operate in the
standard configuration, but the installer can adapt them to the
specific needs of the system with special accessories, and can cus-
tomise the functions by adjusting the internal Dip Switches (see
DIP SWITCH SETTINGS).
System types
The OMNIA ULI_PC series fan coils are designed for 2-tube sys-
tems with cold plasma and are configured:
- without valve;
- with 2-way valve and water probe downstream of the valve;
- with 3-way valve and water probe upstream of the valve;
Ventilation
The three-speed ventilation can be controlled either manually
with the selector in V1, V2 and V3 positions (the fan is used with
cycles of coming on and off at the selected speed), or automati-
cally with the selector in AUTO position (the fan speed is con-
trolled by the thermostat according to the room temperature).
For systems with valve (Dip.1 = ON) and water probe installation
upstream of the valve (Dip.2 = ON), there may be a delay (maxi-
mum 2'40") between the valve start-up and the fan activation
(exchanger pre-heating).
Ventilation is only allowed when the fins are open; if necessary,
open them manually.
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.
Freddo
Cooling
22°C
25°C
In this configuration, the indications on the "C" led match
the active mode (Red for Hot, Blue for Cold and Blue-Fuchsia or
Red-Fuchsia in the disabled zone). Ventilation is only enabled
if the water temperature is suitable for the Hot or Cold modes.
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 available water
(centralised control of On-Off commands and Heating-Cooling
commands).
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.
- 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 measured is higher
than the chosen setpoint in an interval equal to the dead band
(2°C or the system passes to cooling mode. The dead band
5°C)
is decided by dip3 or dip3 OFF has a dead band of 5°C while
with dip3 ON the dead band is 2°C.
Valve command
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 manag-
ing 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 func-
tion) is Y1. Then the fan inhibition time is automatically calcu-
lated and depends on how long the valve has been closed; it can
Ventilazione
Caldo
Ventilation
disabilitata
Heating
disabled
31°C 35°C
therefore vary from a minimum of 0'00" to a maximum of 2'40".
Frost Protection (anti-freeze protection)
The anti-freeze protection allows you to check that the room tem-
perature never falls to freezing values, even when the fan coil is
switched off and the selector (A) is OFF.
In the event that the temperature falls below 7°C, the thermostat
starts up the fan coil in Heat mode with a setting of 12°C and ven-
tilation in AUTO mode, as long as the water temperature allows it,
the fan coil is powered and the delivery fin is in the Open position.
If there is no water probe the fan is always enabled. If the valve has
an upstream water probe or no water probe, the heat exchanger is
still pre-heated.
It emerges from the anti-freeze mode when the temperature
exceeds 9°C.
Emergency Mode
The emergency mode activates in case of failure or missing
probe. This is indicated by the flashing yellow LED (D). In case of
failure or missing SA ambient probe, the thermostat switches to
the following mode:
- with selector (A) in position OFF, the water valve is closed and
the fan turned off;
- with selector (A) in position AUTO, V1, V2 and V3, the water
valve is always open and the fan goes through the on-off cycles
at V1; in this condition the power from the terminal is manually
controlled by means of the selector (B): rotating it to the right,
the duration of the ON cycle increases up to a maximum of 5'20;
turning it to the left decreases the duration. If there is a fault or
missing water probe, the thermostat switches to the following
mode:
- The ventilation is always active
- The season change is made on the basis of the difference
between the setting made and the actual ambient temperature.
If the ambient temperature exceeds an interval equal to the
dead band under the Heating Mode it passes to Cooling Mode;
If the ambient temperature drops below an interval equal to the
dead band, Cooling Mode passes to Heating Mode;.
Cold plasma
The Cold plasma air purifier activates simultaneously with the
ventilation function during both Heating and Cooling. When the
selector (A) is in position "Aux", the machine is only used for air
purification.
The operation of the device is indicated on the thermostat by
the yellow LED.
The Cold plasma purification system breaks down the water
and oxygen molecules that are usually in the environment's
air ("humidity" and "oxygen"), into positive and negative ions.
These liberated ions in the air will attach themselves to the pol-
luting substances and when they recombine (once activated)
they decompose into non-toxic sub-products (water, oxygen and
carbon dioxide etc.).

PACKAGING

The fan coils are sent with standard packaging consisting of pro-
tective shells and boxes.

UNIT INSTALLATION

WARNING : Before carrying out any intervention, use the nec-
essary Personal Protective Equipment.
WARNING: check that the power supply is disconnected
before carrying out any procedures on the unit.
WARNING: the electrical wirings, the installation of fan coils
and their accessories must only be carried out by people with
the proper technical and professional qualifications for the
installation, conversion, expansion and maintenance of the
systems and able to check that it is working properly and safe.
The fan coil should be installed in such a way as to facilitate
routine (filter cleaning) and extraordinary maintenance opera-
tions, as well as access to the air vent and discharge valves on
the side of the unit frame (connections side) you are advised
not to install the fan coil above objects that suffer from damp or
wet because in some conditions condensation may form on the
external frame of the equipment with the possibility of dripping
or failures may occur in the hydraulic system and condensate
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