33
English
AGLL10/20NFJ 07/11_4528571_00
If the thermostat is configured for use
without a valve (
dip1 OFF
) or with a
probe upstream of the valve (
dip2 ON
),
then the water temperature detected is
that available on the terminal, there-
fore the season is forced to Hot or Cold
according to this temperature.
The thresholds of the season changeover
are shown in the table below.
In this configuration, the indications of
the left LED correspond to the active
mode.
The ventilation is enabled only if the
water temperature is suitable for the
cooling mode or the heating mode. This
allows on one side to avoid unwanted
cold ventilation in the winter season,
and on the other side to check the turn-
ing on and off of all terminals, accord-
ing to the actual condition of the water
available (centralized control of the
On-Off and Hot-Cold commands).
The normal band (hot enabled at 39° C,
cold enabled at 17° C) or the reduced
band (hot enabled at 35° C, cold ena-
bled at 22° C) is selected based on the
(
dip4)
.
The season changeover of some systems
is based on air temperature, these are:
- 2-pipe systems with the Water Probe
downstream of the valve.
- All 2-pipe systems without water probe.
- All 4-pipe systems.
The season changeover occurs as follows:
-
Cold mode:
if the ambient temperature
detected is below the setpoint of an
interval equal to the dead band (2° C or
5° C) it switches to the hot mode.
- Hot mode:
if the ambient temperature
detected is above the setpoint of an
interval equal to the dead band (2° C or
5° C) it switches to the cold mode.
The dead band is decided through
dip7 or rather if it has a dead band of
5° C (dip7 OFF) while if the dead band
is 2° C (dip7 ON).
HOT/COLD MODE CHANGE OVER
COLD SEASON CHANGEOVER
THRESHOLD
HOT SEASON CHANGEOVER
THRESHOLD
DIP SWITCH
MEANING
12
°C /
22
°C
35
°C
/ 39
°C
Normal band (dip 4 off)
22
°C /
25
°C
31
°C
/ 35
°C
Reduced band (dip 4 on)
WATER SIDE SEASON CHANGEOVER
SEASON CHANGEOVER BASED ON THE AIR
VENTILATION ENABLING
ANTI-FREEZE PROTECTION
The anti-freeze protection allows you to
check that the room temperature never
falls to freezing values (even when the
selector is in the OFF position). If the
temperature drops below 7° C, the ther-
mostat still operates in HEATING mode
with SETPOINT at 12° C and ventilation
in AUTO, if the temperature of the water
permits so. In case of Water Probe not
present or continuous ventilation, the fan
is always enabled. If the valve is present
and the water probe is upstream or the
water probe is absent, the pre-heating of
the heat exchanger is still executed.
The thermostat exits the Anti-freeze
mode when the room temperature
exceeds 9°C.
The thermostat also includes an external
contact that allows to set it to OFF if it
is closed (except if the thermostat is in
anti-freeze mode or as a slave in the TTL
network). This contact could be useful to
manage inputs such as window contacts,
faulty circulation pump, etc.
CE input status
Machine status
Closed
OFF
Open
ON
EXTERNAL CONTACT LOGIC
