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IHLNLJ 1711 - 6887212_01
ambient conditions and the fan coil
configuration.
Thermostat settings:
-
3-level thermostat.
With the selector
on AUTO. The fan maintains the speed
relating to one of the three predeter-
mined steps, depending on the differ-
ence between room temperature and
set point. Once it has reached the set
point, the fan will switch off.
-
Modulated output thermostat.
With
the selector on AUTO. The fan makes
cycles, alternating the speeds accordi-
no 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 compat-
ible with continuous ventilation man-
agement.
• Ventilation management
Ventilation settings:
-
Continuous ventilation.
Ventilation
is always active. The temperature is
controlled 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 thermostat" option.
-
Thermostat-controlled ventilation.
Ventilation switches off when the set
temperature is reached (set point).
• Valve adjustment logics
With the
Thermostat-controlled ventila-
tion
or
Modulated output thermostat
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 closings; with hot water circulat-
ing 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,
ventilation is always enabled on the
slave fan coil.
The water temperature probe can be
positioned
downstream
or
upstream
from the shutoff valve, so also the
dipswitches 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 star-
tup is dependent on the temperature of
the water in the system. With this set-
ting, 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 stand-
ard 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 manage inputs such as a remote
ON-OFF command, a presence sen-
sor, a window contact, a faulty circula-
tion pump signal, etc.
In fan coil networks, only the external
contact of the master fan coil is ena-
bled. 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, ventila-
tion stops but the electronic thermostat
card and the other fan coils in the net-
work carry on working.
• Emergency operation
In the event of a faulty probe, the elec-
tronic card can automatically detect
the problem and enable an emergen-
cy program to avoid any inconven-
ience 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 oper-
ation 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 appropri-
ate correction (because the housing is
influenced in a different way).
Upstream Probe
Downstream Probe
Water Present Probe
Water Absent Probe
Water Present Probe
Water Absent Probe
With Valve
Water side changeover
Air side changeover
Air side changeover
Air side changeover
Pre-heating delay
Pre-heating delay
No ventilation delay
Pre-heating delay
Minimum and maximum
controls active
No minimum and maximum
control
Minimum and maximum
controls active
No minimum and maximum
control
Dynamic correction A
Fixed correction
Dynamic correction B:
Fixed correction
Without Valve
Configuration not used
Water side changeover
Air side changeover
No ventilation delay
No ventilation delay
Minimum and maximum
controls active
No minimum and maximum
control
Dynamic correction B:
Fixed correction
