Description Of The Functions - AERMEC VMF-E0X Manuel D'utilisation Et D'installation

DESCRIPTION
VMF-E0X
ELECTRONIC THERMOSTAT BOARD FOR FAN COILS
The VMF-E0X accessory is an
advanced electronic thermostat kit
to be applied to the fan coils; it
requires an interface inside the fan
coil (VMF-E2; VMF-E2H), or on the
wall (VMF-E4).
The VMF-E0X kit consists of:
• an E0-type thermostat board
inserted in a protective box and
easily applied to the side of the fan
coil. The E0-type thermostat board
has a protective fuse, a dip-switch
for configuration, and connectors
for connection with:
- the power supply,
- the earthing,
- the valve control,
- the fan motor control,
- the ambient air temperature probe,
- the water temperature probe,
- the control panel (user interface),

Description of the functions

• Operation in TTL network
The E0 thermostat is designed to com-
municate with other E0 and/or E1 and/
or E18 thermostats via a dedicated serial
based on the TTL logic standards. This
serial communication is essential for
the exchange of information within
small fan coil networks (up to 6) with a
maximum network length of 30 metres.
It was designed, in fact, for small areas
where the fan coils (more than one)
need to be controlled from a single
control point.
More specifically, this network always
contains a Master (to which a user inter-
face VMF-E2, VMF-E2H, VMF-E4 is con-
nected) which controls the operation of
the Slaves connected to it, according to
the settings made on its user interface.
The Master fan coil is fitted with an
E0-type electronic board (VMF-E0X, or
fan coils fitted as standard with board
E0), or an E1-type board (VMF-E1X) +
user interface.
The Slave fan coil must be fitted with an
E0-type electronic board (VMF-E0X), or
an E1-type board (VMF-E1X).
All the fan coils of the TTL network must
have the same type of configuration.
Example: all standard, all with puri-
fiers (Plasmacluster and/or germicidal
lamps), or all with an additional coil
14 AVMFE0LJ 1704 - 6795744_00
- the external contact,
- the microswitch contact connected
to the fan coil fin,
- the fan coil network serial (TTL).
With the VMF-E0X, you can man-
age:
• Three fan coil speeds in manual
mode
• Continuous ventilation and ther-
mostat control, by controlling the
valves
• Automatic fan mode according to
the load
• Season visualisation
• Visualisation of alarms and venti-
lation request
• Up to two ON/OFF 2- or 3-way
valves
• The switch-on of an electric heater
• A germicidal lamp
• Plasmacluster filter
(electric or with water).
On the basis of the settings received from
the network and the ambient conditions
detected by the probes, the electronic
board on each single Slave fan coil acts
(independently from the other fan coils)
to switch the ventilation on and off in
order to create the conditions requested
by the user for that specific room.
• Cooling operation
Cooling operation requires a water circuit
with chiller.
• Heating operation
Heating operation requires a water circuit
with boiler, heat pump or solar system.
• Changeover (seasonal change)
The thermostat automatically selects the
operating mode (Heating/Cooling), if
that mode is permitted (water probe
and settings).
- Normal band: Heating at 39°C; Cooling
at 17°C.
- Reduced band: Heating at 35°C;
Cooling at 22°C.
- Dead band: can be selected at 5°C or
2°C.
Water side changeover
- Water temperature checks
Enabling of water side ventilation (only
active with water temperature probe).
• An air temperature probe
• A water temperature probe, with
minimum and maximum tempera-
ture and changeover functions
• Season change according to the
water or air temperature (4-pipe
systems)
• Input for "external contact". This
is a digital input with the following
logic: When open, the thermostat
works normally; When closed, the
fan coil is switched off
• Microswitch for fin contact
• Anti-freeze function
• Communication with other thermo-
stats, via a dedicated serial based on
the TTL logic standards
The thermostat identifies the ventilation
enabling threshold in Heating mode
(minimum controlled) and Cooling
mode (maximum controlled); with the
dip-switches it is possible to choose
between two temperature bands.
Air side changeover
If the actual ambient temperature is lower
than the set point by a value equal to
the Dead Band, there is an automatic
swap to Heating operation.
If the actual ambient temperature is high-
er than the set point by a value equal
to the dead band, there is an automatic
swap to Cooling operation.
In the fan coil networks, the values of the
dead band are only those configured on
the Master fan coil.
• Pause due to power failure
After a power failure, the unit restarts
with the settings that were active prior
to the pause.
• Delayed start-up
The unit can begin ventilation some time
after start-up - usually up to 2'40" (pre-
heating function).
The delay is zero-set in units with an
electric heater.
• Anti-freeze protection
Controls on OFF position. The fan coil
can restart in heating mode (set point