Unit Installation - AERMEC FCX APC Manuel D'utilisation Et D'installation

OPERATION
FCX APC fancoils are delivered ready to operate in standard
configuration, though can be adjusted by the installation tech-
nician to specific requirements by means of dedicated accesso-
ries and configuration of functions at the internal dipswitches
(see DIPSWITCH CONFIGURATION).
Response to controls is immediate, except in special cases.
Unit types
FCX APC 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 tem-
perature detected).
On systems with a valve (dip1 = ON) and a Water Probe instal-
led 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 tempe-
rature detected in the unit.
According to the dipswitch settings, two types of season chan-
ge (water side) are possible:
- Dip1 = OFF, Dip2 = OFF (standard configuration) with mini-
mum/maximum temperature control only;
- Dip1 = ON, Dip2 = ON (configuration with three-way valve
and probe before the valve) with minimum/maximum tempera-
ture 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 tem-

UNIT INSTALLATION

IMPORTANT: check that the power supply is disconnected
before performing operations on the unit.
CAUTION: wiring connections installation of the fancoil and
relevant accessories should be performed by a technician
who has the necessary technical and professional expertise
to install, modify, extend and maintain plants and who is able
to check the plants for the purposes of safety and correct
operation.
The fancoil should be installed in such a way as to facilitate
routine (filter cleaning) and special maintenance operations,
as well as access to the air breather valve on the side of the
unit frame (connector side).
To install the unit, proceed as follows:
- Extract the air filter.
- Remove the rear cover panel in the case of wall models,
sizes 22 to 50.
- In the case of wall-mounted, keep a minimum clearance of
80 mm from the floor. In the case of floor-mounted units on
bases, refer to the instructions supplied with the accessory.
- Use expansion plugs (not supplied) to secure the unit to the
wall or ceiling, as shown in figures 1 and 2.
perature 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 redu-
ced 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
The valve can be controlled in two modes:
- 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
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 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: the
water valve remains open and 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): rota-
te the switch to right to increase cycle duration, or to the left to
reduce it.
- Make hydraulic connections.
Refer to the dimensional data for the position and diameter of
the hydraulic connectors.
Insulate water lines adequately or fit the condensate drainage
tray (available as an accessory) to prevent dripping during coo-
ling applications.
In case of horizontal installation, fit the condensate discharge
pipe (supplied separately) following the indications shown in
picture 6. The connection between pipe and drip tray must be
sealed with silicone.
The condensate drainage system should be of an adequate size
and be positioned to favour runoff (min. 1% slope). If conden-
sate is discharged into the sewage system, install a siphon to
prevent return of unpleasant odour into the room.
- Make the electrical connections as shown in the wiring dia-
grams.
- Remount the cover, or the front pannel, connect the ambient
sensor or the microswitch (if present).
- Refit the air filter.
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