Operation - AERMEC Omnia UL C-Serie Bedienungs- Und Installationsanleitung

OPERATION

OMNIA UL C fancoils are delivered ready to operate in standard
configuration, though can be adjusted by the installation techni-
cian to specific requirements by means of dedicated accessories
and configuration of functions at the internal dipswitches (see
DIPSWITCH CONFIGURATION).
Response to controls is immediate, except in special cases.
Unit types
OMNIA UL C 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 automati-
cally when the selector switch is set to the AUTO position (fan
speed is controlled by the thermostat according to room tempe-
rature 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 tempera-
ture detected in the unit.
According to the dipswitch settings, two types of season change
(water side) are possible:
- Dip1 = OFF, Dip2 = OFF with minimum/maximum temperature
control only;
- Dip1 = ON, Dip2 = ON 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 fit-
ted with 2-way valve, season change takes place from the air side,
through 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 temperature).
Water temperature controls
The thermostat only enables fan operation when the water
temperature 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
position 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 ther-
mostat 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
OMNIA UL C
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