AERMEC Omnia HL 11 N Use And Installation Manual page 28

point, the fan will switch off.
- Modulated output thermostat. With
the selector on AUTO. The fan makes
cycles, alternating the speeds accor-
dino to the difference between room
temperature and set point. Once it
has reached the set point, the fan will
switch off. This setting is not compatible
with continuous ventilation manage-
ment.
• Ventilation management
Ventilation settings:
- Continuous ventilation. Ventilation is
always active. The temperature is con-
trolled by intercepting the flow of water
to the fan coil. This function requires the
presence of a water valve (accessory),
and cannot be activated simultaneously
with the "modulated output thermo-
stat" option.
- Thermostat-controlled ventilation.
Ventilation switches off when the set
temperature is reached (set point).
• Valve adjustment logics
With the Thermostat-controlled venti-
lation or Modulated output thermo-
stat setting the valve is managed with
the following logics:
- Heating, the valve is managed to
exploit the stack effect of the fan coil,
and to provide heat even with the fan
switched off. These settings also reduce
the number of valve openings and clos-
ings; with hot water circulating in the
fan coil, a request from the thermostat
will produce ventilation immediately.
- Cooling, to make the best use of the
unit's cooling capacity and perform a
more accurate check on the room tem-
perature, the valve opening does not
coincide with ventilation.
• Water probe
There is a water temperature probe in the
heat exchanger of the unit.
The slave fan coil can work without the
water probe: if it is absent or faulty, the
temperature will be measured by the
master probe along. In this case, ventila-
tion is always enabled on the slave fan
coil.
The water temperature probe can be
Water Present Probe
Water side changeover
Pre-heating delay
With Valve
Minimum and maximum controls
Dynamic correction A
Without Valve
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positioned downstream or upstream
from the shutoff valve, so also the dip-
switches on the card must be set. The
difference lies in the management of
the ventilation of the fan coils with
valve.
Setting the dip-switch as a probe down-
stream of the valve, ventilation startup
(changeover) is dependent on the tem-
perature of the air in the room.
Setting the dip-switch as a probe
upstream of the valve, ventilation start-
up is dependent on the temperature
of the water in the system. With this
setting, the pre-heating function is acti-
vated, and there is a ventilation start-up
delay of between 0" and 2'40".
To position the bulb on the delivery pipe
upstream of the valve, the standard
water probe must be replaced with the
SW3N probe accessory.
• External contact
The card offers the possibility of a con-
nection with an external contact. With
a closed external contact, the unit is
configured as in the thermostat OFF
position (except when the thermostat
is in the Anti-freeze Protection position
or when the ambient probe is absent or
faulty). This contact can be used to man-
age inputs such as a remote ON-OFF
command, a presence sensor, a window
contact, a faulty circulation pump sig-
nal, etc.
In fan coil networks, only the external
contact of the master fan coil is enabled.
If the master input is closed, all the slave
fan coils of the network are switched off.
• Microswitch contact
The card offers the possibility of a con-
nection with the Microswitch contact
located on the delivery fins. With the
fins closed, the fan coil is 100% OFF.
In fan coil networks, when the fin of the
master fan coil is closed, ventilation
stops but the electronic thermostat card
and the other fan coils in the network
carry on working.
• Emergency operation
In the event of a faulty probe, the elec-
tronic card can automatically detect the
Upstream Probe
Water Absent Probe
Air side changeover
Pre-heating delay
No minimum and maximum
active control
Fixed correction
Configuration not used
problem and enable an emergency pro-
gram to avoid any inconvenience for the
user, who is immediately informed of
the fault (LED indicator lights).
• Ambient probe correction
To obtain a better room temperature
adjustment, the thermostat applies
special algorithms to correct the ambi-
ent probe installed on the fan coil; the
probe is in contact with the housing,
and is therefore influenced by it.
The dynamic correction is a correction
algorithm of the ambient probe which
takes into account the particular opera-
tion status of the fan coil in any one
moment. More precisely, there are two
possible cases of dynamic correction:
- Dynamic correction A: in the case
of systems without a valve (or with a
downstream probe), the correction
depends on the water and ambient
temperatures.
- Dynamic correction B: in the case of
systems with a valve and an upstream
probe, the correction depends on the
valve and on the water and ambient
temperatures. Unlike the previous cor-
rection, this one uses different time
constants to calculate the appropriate
correction (because the housing is influ-
enced in a different way).
Downstream Probe
Water Present Probe
Air side changeover
No ventilation delay
Minimum and maximum controls
active
Dynamic correction B:
Water side changeover
No ventilation delay
Minimum and maximum controls
active
Dynamic correction B:
Water Absent Probe
Air side changeover
Pre-heating delay
No minimum and maximum
control
Fixed correction
Air side changeover
No ventilation delay
No minimum and maximum
control
Fixed correction