Functioning Characteristics; Packaging; Unit Installation - AERMEC Omnia ULI 16 C Manuel D'utilisation Et D'installation

FUNCTIONING CHARACTERISTICS

The OMNIA ULI C fan coils are supplied ready to operate in the stand-
ard configuration, but the installer can adapt them to the specific
needs of the system with special accessories, and can customise the
functions by adjusting the internal Dip Switches (see DIP SWITCH
SETTINGS).
System types
OMNIA ULI_C fan coils are designed for 2 with electric heater, con-
figured as follows:
- without valve;
- with 2-way valve and water probe downstream from 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 automatical-
ly with the selector in AUTO position (the fan speed is controlled
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.
Cooling
22°C
25°C
In this configuration, the indications on the "(C)" led match
active mode (Red for Hot, Blue for Cold and Blue-Fuchsia or Red-
Fuchsia in the disenabled zone). Ventilation is enabled only 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 water available (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 down-line of the valve.
All 2-pipe systems without water probe.
change of season takes place in relation to the following criteri-
on:
- 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 is
5°C)
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 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 open-
ing.
The valve in question (for heat exchanger pre-heating function)
Ventilation
Heating
disabled
31°C 35°C
is Y1. 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".
Frost Protection (anti-freeze protection)
The anti-freeze protection allows you to check that the room temper-
ature 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 venti-
lation 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.
In case of the fan absent water probe it is always enabled. In the
case of this valve and the water probe upstream or the water
probe is absent, the preheating of the exchanger is still executed
It emerges from the anti-freeze mode when the temperature exceeds
9°C.
Emergency Mode
The emergency mode is activated in case of failure or absence of a
probe. It is indicated by blinking LED (D) yellow. In case of failure or
absence of the SA ambient probe, the thermostat behaves as fol-
lows:
- With selector switch (A) to the OFF position, the water valve is
closed and the fan off.
- With selector switch (A) in AUTO, V1, V2 and V3 the water valve
is always open and the fan performs on - off cycles to V1; in this
situation the output from the terminal is controlled maualmente
through the selector (B): by turning to the right the duration of the
on cycle increases up to a maximum of 5'20 "; turning to the left
the duration decreases.
In case of failure or absence of SW water probe, the thermostat
behaves as follows:
- The ventilation is always enabled
- The season change occurs according to the difference between
the set and the set room temperature. If your environment
exceeds an interval equal to the dead zone below the heating set
the program switches to cool mode; if the environment falls by an
interval equal to the dead zone under the cold in September the
program switches to warm mode.

PACKAGING

The fan coils are sent with standard packaging consisting of protec-
tive shells and boxes.

UNIT INSTALLATION

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 installa-
tion, 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 rou-
tine (filter cleaning) and extraordinary maintenance operations,
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
drainage with the consequent spilling of liquid.
The assembly site must be chosen in such a way that the maxi-
mum and minimum ambient temperature limits are respected
0÷45°C (<85% U.R.).
To install the unit, proceed as follows:
a) Remove the housing by unscrewing the screws on the head
under the hatches.
b) For wall mounted units, keep a minimum distance from the
floor of
80 mm. - For floor mounting using feet, refer to the instructions
supplied with the accessory;
c) The supporting wall must be perfectly flat. For fixing, use 4
wall plugs (not supplied) with suitable characteristics for the
specific type of wall.
13